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1 2018 Spring Meeting of The Korean Ceramic Society 2 / 0 / 1 / 8

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6 Powder Tech. Machine Tech. Coating Tech.

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8 Plenary Lecture I CECO Room , Apr. 12, Thu., AM 11:40-12:20 Material-genome perspective towards robust T/EBC materials Dr. Jingyang Wang High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China Plenary Lecture II CECO Room , Apr. 13, Fri., AM 11:20-12:00 Hybrid Interface Materials for Future Innovations

9 2018 Spring Meeting of The Korean Ceramic Society 2 / 0 / 1 / 8

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19 Room 600A 08:00-17:00 G1-1 08:30-08:45 Muhammad Habib G1-2 08:45-09:00 G1-3 09:00-09:15 G1-4 09:15-09:30 G1-5 09:30-09:45 09:45-10:00 G1-6 10:00-10:30 G1-7 10:30-10:45 G1-8 10:45-11:00 G1-9 11:00-11:15 11:40-12:20 12:30-13:30 S :30-13:55 Byung Hyun Yun SeungJin Jung Incheol Jung Chan Woo Lee WooChul Jung and Kang Taek Lee DGIST KAIST KIER S :55-14:20 KAIST S :20-14:45 S :45-15:10 Nikolai KAIST KIMS 15:10-15:15 9

20 Room 600A S :15-15:40 KAIST S :40-16:05 KIST S :05-16:30 UNIST 16:30-17:30 17:30-18:00 18:00-20:00 10

21 Room 600B 08:00-17:00 G2-1 08:30-08:45 G2-2 08:45-09:00 G2-3 09:00-09:15 Kati KIER G2-4 09:15-09:30 KAIST G2-5 09:30-09:45 KRICT G2-6 09:45-10:00 KIMS 10:00-10:15 G2-7 10:15-10:30 KAIST G2-8 10:30-10:45 G2-9 10:45-11:00 G :00-11:15 11:40-12:20 12:30-13:30 14:00-14:05 14:05-15:00 11

22 Room 600B 15:00-16:00 16:30-17:30 17:30-18:00 18:00-20:00 12

23 Room :00-17:00 G5-1 09:00-09:15 G5-2 09:15-09:30 G5-3 09:30-09:45 G5-4 09:45-10:10 KICET 10:10-10:20 G5-5 10:20-10:45 KICET G5-6 10:45-11:00 G5-7 11:00-11:15 MERTAMANI RIESSA NANDA G5-8 11:15-11:30 11:40-12:20 12:30-13:30 S :30-14:00 S :00-14:30 KICET S :30-15:00 KIST 15:00-15:15 S :15-15:45 S :45-16:15 Deepam Maurya Shashank Priya KIST Virginia Tech Penn State Univ S :15-16:45 13

24 Room :30-17:30 17:30-18:00 18:00-20:00 14

25 Room :00-17:00 G6-1 08:30-08:45 KOPTI G6-2 08:45-09:00 KICET G6-3 09:00-09:15 KICET G6-4 09:15-09:30 POSTECT G6-5 09:30-09:45 POSTECT 09:45-10:00 G6-6 10:00-10:15 POSTECT G6-7 10:15-10:30 Kenji Shinozaki National Institute of Advanced Industrial Science and Technology G6-8 10:30-10:45 POSTECT G6-9 10:45-11:00 G :00-11:15 POSTECT 11:40-12:20 12:30-13:30 S :30-14:00 UNIST S :00-14:30 GIST S :30-15:00 KAIST 15:00-15:15 15

26 Room 603 S :15-15:45 S :45-16:15 S :15-16:45 KAIST 16:30-17:30 17:30-18:00 18:00-20:00 16

27 Room :00-17:00 G4-2 08:42-08:54 GIST G4-3 08:54-09:06 IAE G4-5 09:18-09:30 KICET G4-6 09:30-09:42 G4-7 09:42-09:54 09:54-10:05 G4-8 10:05-10:30 G4-9 10:30-10:42 Jianwu Shi Henan Univ G :42-10:54 Francis Malar Auxilia GIST G :54-11:06 G :06-11:18 G :18-11:30 Univ of Illinois Urbana Champaign 11:40-12:20 12:30-13:30 16:30-17:30 17:30-18:00 17

28 Room 604 S :30-13:55 S :55-14:20 S :20-14:45 Jin Joo Ryu Gun Hwan Kim KRICT 14:45-15:00 S :00-15:25 S :25-15:50 KIST S :50-16:15 Han Bo Ram Lee Incheon Nat l Univ 16:30-17:30 17:30-18:00 18:00-20:00 18

29 Room :00-17:00 S :30-09:00 KERI Leibniz Institute for Solid State and Materials Reserarch Dresden S :00-09:30 KIMS S :30-10:00 KIMS 10:00-10:30 S :30-11:00 S :00-11:30 c51 11:40-12:20 12:30-13:30 S :30-13:50 S :50-14:10 S :10-14:30 KIMS S :30-14:50 KIST 14:50-15:00 S :00-15:20 KIMS S :20-15:40 KICET S :40-16:00 S :00-16:15 Nguyen Van Du Nguyen Van Du Jamil Soonil Lee KICET S :15-16:30 Jamil Woo Hyun Nam Nguyen Van Du Gul Rahman Altaf Ur Rahman Kyu Hyoung Lee Won Seon Seo Weon Ho Shin Myong Ho Kim Soonil Lee KICET Quaid i Azam Univ Yonsei Univ Changwon Nat l Univ 19

30 Room :30-17:30 17:30-18:00 18:00-20:00 20

31 Room :00-17:00 11:40-12:20 12:30-13:30 S :30-14:00 POSTECT S :00-14:30 S :30-15:00 DGIST S :00-15:30 Andrew C Kummel IBS Univ California S :30-16:00 Tobin J Marks Northwestern Univ 16:30-17:30 17:30-18:00 18:00-20:00 21

32 Room :00-17:00 G3-1 08:30-08:45 KIMS G3-2 08:45-09:00 KIMS G3-3 09:00-09:15 KIMS G3-4 09:15-09:30 KIMS ADD G3-5 09:30-09:45 KIST 09:45-10:00 G3-6 10:00-10:15 Bukhari Syed Zaighum Abbas KIMS G3-8 10:30-10:45 Amit Siddharth Sharma Pipit G3-9 10:45-11:00 Pipit Amit Siddharth Sharma G :00-11:15 Pipit Amit Siddharth Sharma Arifin Septiadi 11:40-12:20 12:30-13:30 SS2-1 13:30-14:00 NIMS Wuhan Univ Technol SS2-2 14:00-14:20 Rong TU Song ZHANG Lianmeng ZHANG Takashi GOTO Wuhan Univ Technol China Tohoku Univ Japan SS2-3 14:20-14:40 Attaur Rahman KIMS SS2-4 14:40-15:00 Xin Xu Young Hwan Han Fei Chen Wansok Jang Wuhan Univ Technol China 22

33 Room 607 SS2-5 15:00-15:20 KICET SS2-6 15:20-15:40 Liqiang Mai Wuhan Univ Technol China SS2-7 15:40-16:00 SS2-8 16:00-16:20 Jianguo Guan Huiru Ma Wei Luo Jindan Yan Kai Tang Wuhan Univ Technol China SS2-9 16:20-16:40 Weichen Hong Xiangyu Lu Fei Chen Qiang Shen Lianmeng Zhang Wuhan Univ Technol China SS :40-17:00 Yoonjoo Lee Ji Hwoan Lee Dong Geun Shin Toshiyuki Nishimura Byung Koog Jang Alfian Noviyanto Heyon Myong Lee Wuhan Univ Technol KICET NIMS 16:30-17:30 17:30-18:00 18:00-20:00 23

34 Room 700A 08:00-17:00 S :00-09:15 S :15-09:30 S :30-09:45 S :45-10:00 10:00-10:15 S :15-10:40 UNIST S :40-11:05 ETRI S :05-11:30 KIST 11:40-12:20 12:30-13:30 S :30-13:45 Shaopeng Qiao Alana F Ogata Gaurav Jha Vivian T Chen Reginald M Penner KAIST Univ California S :45-14:10 S :10-14:35 GIST S :35-15:00 KAIST 15:00-15:15 S :15-15:40 S :40-16:05 S :05-16:30 16:30-17:30 17:30-18:00 18:00-20:00 24

35 Room 700B 08:00-17:00 G7-1 09:45-10:00 KICET G7-2 10:00-10:15 KIGAM G7-3 10:15-10:30 G7-4 10:30-10:45 10:45-11:00 G7-5 11:00-11:15 G7-6 11:15-11:30 R D 11:40-12:20 12:30-13:30 S :30-14:00 S :00-14:30 S :30-15:00 15:00-15:10 S :10-15:40 S :40-16:10 S :10-16:40 16:30-17:30 17:30-18:00 18:00-20:00 25

36 Room 600A 08:00-17:00 S :30-09:00 Muneaki Kurimoto Nagoya Univ S :00-09:20 KITECH S :20-09:40 KRICT S :40-10:00 KIMS S :00-10:20 KICET S :20-10:50 Laura B Cook Corning Inc S :50-11:05 S :05-11:20 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 S :30-15:00 Soshu Kirihara Osaka Univ S :00-15:20 S :20-15:40 S :40-16:00 GeunHyung Kim Sungkyunkwan Univ S :00-16:15 26

37 Room 600A S :15-16:30 S :30-16:45 16:30-17:00 27

38 Room 600B 08:00-17:00 S :30-08:50 S :50-09:10 S :10-09:30 KICET 09:30-09:55 S :55-10:15 S :15-10:35 IPPILI SWATHI S :35-10:55 GFHIM KAERI S :55-11:15 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 S :30-14:50 KAIST S :50-15:10 S :10-15:30 Venkatraju Jella S :30-15:50 KIMS S :50-16:10 Rosario Gerhardt Georgia Tech 28

39 Room 600B S :10-16:30 Rajaram Mane 16:30-17:00 29

40 Room :00-17:00 S :30-08:45 AKRAM FAZLI MALIK RIZWAN AHMED SALMAN ALI KHAN ALI HUSSAIN Soonil Lee Tae Kwon Song Won Jeong Kim Myong Ho Kim Institute of Space Technology S :45-09:00 MALIK RIZWAN AHMED AKRAM FAZLI ALI HUSSAIN Institute of Space Technology S :00-09:15 POSTEC S :15-09:30 MALIK RIZWAN AHMED AKRAM FAZLI S :30-09:45 Haribabu Palneedi KIMS 09:45-10:00 G :00-10:30 KIMS S :30-10:45 S :45-11:00 KETI G :00-11:15 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 S :30-14:45 G :45-15:00 Kiran Shinde 30

41 Room 602 G :00-15:15 G :15-15:30 KICET G :45-16:00 G :00-16:15 G :15-16:30 Haribabu Palneedi KIMS 16:30-17:00 31

42 Room :00-17:00 S :10-09:35 S :35-10:00 S :00-10:25 S :25-10:50 KIMS S :50-11:15 KAIST 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 16:30-17:00 32

43 Room :00-17:00 S :30-10:00 S :00-10:30 S :30-11:00 S :00-11:30 11:20-12:00 12:20-12:40 12:40-13:30 16:30-17:00 33

44 Room :00-17:00 G8-1 09:00-09:30 POSTECH G8-2 09:00-09:45 POSTECH G8-3 09:45-10:10 10:10-10:20 G8-4 10:20-10:35 KIMS G8-5 10:35-10:50 G8-6 10:50-11:05 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 16:30-17:00 34

45 Room :00-17:00 G :00-09:15 UST KIMS G :15-09:30 UST KIMS G :30-09:45 G :45-10:00 Wahid Muhamad FR Amit Siddharth Sharma G :00-10:15 KICET G :15-10:30 KICET G3-7 10:30-10:45 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 16:30-17:00 35

46 Room 700A 08:00-17:00 S :30-09:00 KICET S :00-09:30 S :30-10:00 Byung Koog Jang Seongwon Kim Yoon Suk Oh Hyung Tae Kim Kee Sung Lee Kyushu Univ Japan KICET Korea Kookmin Univ Korea S :00-10:30 S :30-11:00 KIMS S :00-11:15 KITECH 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 S :30-14:45 KIMS S :45-15:15 S :15-15:45 KIMS UST KICET 16:30-17:00 36

47 Room 700B 08:00-17:00 S :30-09:00 Nguyen Van Quyet KIMS S :00-09:30 KIMS S :30-09:50 09:50-10:15 S :15-10:35 KRICT S :35-10:55 KIER KAIST KAERI KIMS 11:20-12:00 12:00-12:20 12:20-12:40 12:40-13:30 S :30-15:00 KAERI S :00-15:20 KICET S :20-15:40 KIMS ADD 15:40-16:00 S :00-16:20 Gu Jian KIMS S :20-16:40 KICET 16:30-17:00 37

48 Poster-I KETI KETI UNIST KICET KICET UNIST KICET SK KICET KICET KAIST 38

49 Poster-I KAIST KIGAM KAERI KIGAM KICET Yeon bin Choi Jeong hun Son Dong Sik Bae Changwon Nat l Univ Saqib Muhammad KAIST 39

50 Poster-I KAIST KICET KICET KICET KICET KAIST KICET SIYAR MUHAMMAD Jun Young Cho Chan Park Seoul Nat l Univ SIYAR MUHAMMAD Rita Galvez KICET KAIST 40

51 Poster-I KAIST KIMS UST KITECH KITECH KITECH KICT KTL 41

52 Poster-I KICET KICET POSTECH Akhtar Jahan Siddiqa Linlin Chi KIST KU KIST KIST Amirhossein Hasani Arunava Gupta KITECH Univ Alabama Hua Yao Li UNIST KITECH KICET KAIST MIT KITECH 42

53 Poster-I KAIST KAIST KAIST UNIST UNIST UNIST UNIST UNIST Ramesh Raliya Pratim Biswas Parag Banerjee KIST Washington Univ St Louis KRICT KIST KICET Univ Waterloo Liu Na Kwan Woo Kim Sang Hoon Lee Bum Jun Kim Hyung Kyu Lim Nasir Tuqeer Ik Jun Choi Byeong Ju Jeong Min Ki Son and Jae Young Choi Sungkyunkwan Univ KIM BUM JUN JEONG BYEONG JU LEE SANG HOON NASIR TUQEER HYUNG KYU LIM Kwan Woo Kim CHOI IK JUN SON MIN KI Jae Young Choi Sungkyunkwan Univ 43

54 Poster-I Hyung Kyu Lim Sang Hoon Lee Bum Jun Kim Kwan Woo Kim Nasir Tuqeer Ik Jun Choi Byeong Ju Jeong Min Ki Son and Jae Young Choi Sungkyunkwan Univ NASIR TUQEER KIM BUM JUN LEE SANG HOON Kwan Woo Kim HYUNG KYU LIM Jae Young Choi Sungkyunkwan Univ KICET KTL KICET KAIST Md Shahjahan kabir 44

55 Poster-I KICET KICET KOPTI KICET KICET KICET KOPTI 45

56 Poster-I KAERI KIER KIER KIGAM H 46

57 Poster-II KIMS KIMS POSTECH KIMS KIMS KTL KTL KETI UNIST Haribabu Palneedi Mahesh Peddigari KIMS KICET KICET KICET KETI Haribabu Palneedi UNIST KIMS KICET KICET M Meng T L Pham J S Lee and J G Fisher Chonnam Nat l Univ Korea 47

58 Poster-II KICET KETI KIST Brown Univ KIST KIST LE GIA PHAN Chonnam Nat l Univ Jun Ge Liang 48

59 Poster-II KBSI KAIST Nguyen Minh Dat KICET Gyeongsang Nat l Univ KICET Shahjahan KICET KICET KIGAM KICET KICET 49

60 Poster-II KAIST UNIST PARMAR NARENDRA SINGH KIST KIER KRICT 50

61 Poster-II KICET KICET KAIST ADD KICET KAERI Wahid Muhamad FR Amit Siddharth Sharma Pipit Amit Siddharth Sharma Yeungnam Univ Amit Siddharth Sharma Pipit KICET KICET KAERI 51

62 Poster-II CHEN ZHILEI KIST KIST KAERI KAERI Lyu Guanlin Lyu Guanlin Jing Zhang Indiana Univ Purdue Univ KICET KICET KICET KAERI KAERI 52

63 Poster-II KAERI KAERI KICET KICET KICET KICET Manik Eknath Bhosale Chi Linlin Sang Hoon Lee Hyung Kyu Lim Bum Jun Kim Kwan Woo Kim Nasir Tuqeer Ik Jun Choi Byeong Ju Jeong Min Ki Son Jae Young Choi Sungkyunkwan Univ Linlin chi Manik Eknath Bhosale Akhtar Jahan Siddiqa Linlin Chi Linlin Chi Akhtar Jahan Siddiqa KRICT 53

64 Poster-II KIST UNIST KIER KIRCT KICET KETI KICET KITECH SungWook Cho Kijung Kim Taeseup Song Hanyang Univ KICET KRICT KRICT KRICT KRICT KICET KICET KRICT KICET KITECH 54

65 Poster-II KAIST KETI KICET KICET Rahman MD Mokhlesur 55

66 Poster-II KICET 56

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69 구두발표 PL-1 Material-genome Perspective Towards Robust T/EBC Materials Jingyang Wang. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China. SiC f /SiC ceramic matrix composites (CMCs) are the key high temperature structural materials in next generation gas turbines. Robust T/EBC is critically requested to protect CMC-components from severe high temperature oxidation and corrosion in extreme combustion environments. Rare earth silicates, typically referring RE 2 SiO 5 orthosilicates and RE 2 Si 2 O 7 pyrosilicates, are new T/EBC materials due to their low thermal conductivity and excellent stability in extreme environments. There are crucial challenges for the optimal choices of RE-silicate T/EBC candidates due to their complex and tunable crystal chemistry and performances. High-throughput screening of advanced T/EBC materials would be promoted based on material informatics of candidates. Strategic material-genome initiative would also prevail to disclose mechanisms of property diversity and to further adopt novel concepts on the design of robust T/EBC for advanced SiC f /SiC CMCs. PL-2 Hybrid Interface Materials for Future Innovations 김광호. 부산대학교재료공학부교수글로벌프런티어-하이브리드인터페이스기반미래소재연구단 단장혁신소재- 고성능부품-1등제품으로이어지는기술연결고리에서가장원천적으로중요한요소는혁신소재의개발이다. 독일, 일본과같은강한제조업국가의탄생은소재기술의혁신을통해서이루어져왔다. 소재의개발을위하여 Materials System 설정과집중적연구가필요하다. 하이브리드인터페이스소재 는하나의중요한소재연구시스템이며, 이를통하여미래신기능소재, 고성능나노소재등의개발이가능하다. 다양한복합소재에서이종소재 ( 다른조성-스케일등, 세라믹 / 금속, 세라믹 / 고분자, 세라믹 / 세라믹등 ) 의인터페이스에연구초점을맞출필요성이있다. 그들인터페이스에서는서로다른 bulk grain 물질 (A, B) 의최소두원자층이연결되었으며 ( 즉, A/B 결합상태, 경우에따라서는 ~1 nm 두께층에서서로영향을주고받음 ) 전자분포및전자밀도등이 bulk상태와는다르게되기때문에특이한성질을갖는다. 마크로, 마이크로미터스케일의복합체에서는 surface to volume ratio 가작기때문에뚜렷하게나타나지않아서 bulk 성질에묻히고무시되지만, 나노스케일로들어오면, surface to volume ratio가커지기때문에특이한계면특성이증폭되어나타나게된다. 이러한특성들은최근에 DFT 와같은전산소재기법으로예측이가능하다. 본발표에서는구조용나노복합체에서하이브리드인터페이스효과때문에초고경도가발현되는연구결과들을위시하여, 구조체용하이브리드접합에서의인터페이스연구, 기존비철합금에기계적강도향상을위해첨가되는세라믹상의인터페이스에너지변화유도로인한미세구조의변화등여러가지인터페이스주제의연구내용이소개된다. KL-1 Field Assisted Sintering of Garnet-type Li 7 La 3 Zr 2 O 12 Solid Electrolyte for All Solid-State Batteries Fei Chen *, Junyang Li, Dunjie Yang, Yanhua Zhang, Qiang Shen, Lianmeng Zhang. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan , China Recently, all solid-state batteries receive abroad concern in solving safety issues existed in lithium ion batteries with liquid electrolytes and promoting the development of next generation, high energy density lithium batteries. As the key component of all solid state batteries, ceramic solid electrolytes are capable of preventing dendritic lithium growth and enabling the use of new electrode materials with high capacity. Among various candidates, Li 7 La 3 Zr 2 O 12 with cubic garnet-type structure exhibits high room temperature ionic conductivity (~ S/cm), wide electrochemical windows to Li (> 5.5 V) and good stability in contact with lithium metal and most cathode materials as well as in the air. However, cubic LLZO is not a room temperature stable phase and is difficult to synthesize as a result of lithium evaporation during long time and high temperature sintering. Here in this study, field assisted sintering technology (FAST) has been applied to prepare LLZO. The effect of sintering parameters on microstructure and ionic conductivity has been investigated. The results suggest that dense (relative density > 99.8%), cubic LLZO with ionic conductivity as high as S/cm could be obtained at 1150 C with an axial pressure of 10 MPa. Besides, the influence of two main factors which are lithium concentration and framework structure on ionic conductivity has been studied. Results shows that the optimal range of lithium concentration and lattice constant for cubic garnets with high ionic conductivity are 6.35±0.1 mol and 12.94~12.96 Å, respectively. By regulating both two factors, the ionic conductivity of Ta-doped LLZO as high as 0.98~ S/cm could be obtained. Beyond that, all solid-state batteries consisting of Ta-doped LLZO and PEO/LiCoO 2 composite cathode are assembled. The initial charge and discharge capacity are 138 mahg 1 and 136 mahg 1, respectively, with a coulombic efficiency of about 99% and a theoretical discharge capacity of 98%. KL-2 Nanoporous Black Metals for Electrochemical Applications 나노스케일다공성블랙메탈의전기화학적응용유상우 *. 경기대학교 Fabrication of highly porous structures with functionality is one of unending demands throughout conventional catalysts to recently emerging energy conversion and storage. Here we introduce a physical vapor deposition-based technique for the formation of high purity nanoporous structures of various metal catalysts. Typical evaporation process under high vacuum results in compact and dense thin films of the parent sources. However, increasing the working pressure of the background inert gas up to a few torr can induce fractal-like black nanoporous structures of metals with the porosity exceeding 99% that absorb almost all visible light spectrum. It utilizes homogenous nucleation of evaporated atoms due to multiple collisions during the traverse in the vacuum chamber and diffusionlimited-aggregation (DLA) of nanoclusters on the substrate. The morphology and porosity can be controlled by adjusting process parameters such as background gas pressure, substrate temperature, and evaporation rate, etc. The electrochemical applications of black metals will be introduced in this presentation; black Sn shows the enhanced retention and cyclability as it is applied to Li-ion battery anode; black Cu demonstrates pronounced stability of CO 2 reduction to C 2 H 4 ; black Au provides a better performance for surface-enhanced 한국세라믹학회 59

70 2018 년한국세라믹학회춘계연구발표회 Raman spectroscopy (SERS) compared to commercial SERS substrates. G1-1 Effect of Bi-contents on the Piezoelectric and Electrical Properties of Lead-free BiFeO 3 -BaTiO 3 Ceramics 비스무스첨가량에따른비납계비스무스페라이트-티탄산바륨고용체의압전및전기적특성이명환 *, 김다정, 최해인, Muhammad Habib, 송태권, 김명호, 김원정. 창원대학교 The BiFeO 3 -BaTiO 3 (BF-BT) solid solution system have shown potential as a promising alternative material for environment-friendly and high-temperature piezoelectric applications. In this study, lead-free 0.67Bi (1-x) FeO BaTiO 3 (x = 0.95, 1.00, 1.03, 1.05, and 1.10) (BF-BT) ceramic were prepared via a typical solid-state reaction followed by water quenching process. The physical properties were very sensitive to process temperatures in BF33BT ceramics. The piezoelectric and electrical properties were changed in a narrow Bi contents range and its effects were investigated. The largest remnant polarization (2P r = 80 μc/cm 2 ) and the lowest strain hysteresis (20%) were observed by the sample with x = 1.03, and its Curie temperature was 483 o C. This ceramic shows good piezoelectric properties with large grain; the piezoelectric charge sensor coefficient (d 33 ) was 368 pc/n and piezoelectric actuator coefficients (d 33 *) was 352 pm/v. Detailed physical properties of BF- BT ceramics will be presented concern with piezoelectric application. G1-2 Piezoelectric and Ferroelectric Properties of the Bulk Ceramics and Thick Film in BiFeO 3 -BaTiO 3 System BiFeO 3 -BaTiO 3 계후막의압전및강유전특성김다정 *, 이명환, 송태권, 김명호. 창원대학교 Piezoceramics have been interesting for potential applications, such as actuator, sensors and other electronic devices. However, the lead-free based ceramics have not yet been developed with the properties to replace PZT: d 33 > 300 pc/n, T c > 300 C. BiFeO 3 -BaTiO 3 (BF-BT) solid solution systems are presented as potential lead-free piezoelectric system. Tape casting process is the most efficient and reliable method to produce the thick films that are necessary for real application in commercial piezoceramics. Specially, the BiFeO 3 -BaTiO 3 (BF-BT) systems have low sintering less than 1000 C, which provides the production price and saving energy as internal simple metal electrode materials such as economical Pd-(Ag, Ni. Cu. etc.,) alloy electrode for multilayer thick film electroceramics. G1-3 Low Temperature Sintering of Soft/Hard-based PZT- PZNN Piezoelectric Ceramics and their Application to Piezoelectric Energy Harvester Soft/hard계 PZT-PZNN 압전세라믹의저온소결및압전에너지하베스터적용조소라 1*, 김대수 2, 조유리 3, 손신중 3, 강형원 3, 남산 1, 한승호 3. 1 고려대학교, 2 호서대학교, 3 전자부품연구원최근다양한에너지를활용하는에너지하베스팅에대한관심이높아지고있다. 다양한에너지원중에서기계적에너지를전기에너지로전환할수있는압전에너지하베스팅은 wireless sensor node와같은작은전자제품의전원을충분히제공할수있어많은 주목을받고있다. 압전세라믹은압전에너지하베스터구현을위한중요한구성요소로써 resonant devices 에서는높은기계적품질계수 (Q m ) 와기계적결합계수 (k p ) 를가지는물질이에너지하베스터의높은출력밀도를나타낸다고보고되어왔다. 대표적인압전물질인 PZT 계열의물질들은높은압전특성을나타내는것으로많이알려져있으며그중 PZT-PZNN 물질은정방정계구조와능면체구조가동시에존재하는 MPB 영역에서높은 d 33 와 ε T 33/ε 0 을가지며많은관심을나타내고있다. 하지만, PZT-PZNN 물질은 1000 o C 이상의높은소결온도를필요로하며이를적층형소자로사용하게될경우고가의 Ag/Pd 전극을사용해야한다는문제가있다. 따라서, 본연구에서는 soft 계 PZT-PZNN 계열세라믹에 CuO 소결조제를첨가하여 900 o C 이하의저온소결을유도하였고, MnCO 3 를첨가하여 hardening 효과를보고자하였다. 각각의소자를이용하여단판형및적층형캔틸리버타입에너지하베스터를제작하여에너지하베스터의성능을비교분석하였다. G1-4 Enhanced Piezoelectric Properties of (Na 0.5 K 0.5 )(Nb 1-x Sb x )- CaZrO 3 Pb-free Piezoelectric Ceramics with Polymorphic Phase Boundary polymorphic phase boundary 구조를갖는 (Na 0.5 K 0.5 )(Nb 1-x Sb x )- CaZrO 3 무연압전세라믹스의향상된압전특성연구이규탁 *, 남산, 김대현. 고려대학교 The 1.0 mol% CuO-added 0.96(Na 0.5 K 0.5 )(Nb 1-x Sb x )-0.03CaZrO 3 ceramics (x = 0.0 ~ 11 mol %) were sintered at 1060 o C for 6 h. The crystal structure of the specimen with x = 0.0 is orthorhombic and the orthorhombic and tetragonal phase boundary temperature (T O-T ) decreased with the increase of Sb 2 O 5. The decrease in T C was considerable compared to that in T O-T, and thus the tetragonal phase disappeared when x exceeded The polymorphic phase boundary (PPB) structure containing orthorhombic and pseudocubic structures was formed for the specimens with x The structural analysis of these specimens will be discussed using the results of the Rietvelt analysis. In addition, the maximum d 33 (518 pc/ N) values which have PPB structure containing orthorhombic and pseudocubic structures were obtained from the specimen with x = 0.09 and the enhanced piezoelectric properties of these specimens were explained in term of crystal structure and dielectric constant. G1-5 Structural and Electric Properties of a Lead-free Piezoelectric Thin Film Deposited by Electrophoresis Using Inorganic Nanosheets 무기물나노시트를이용하여전기영동법에의해증착된무연계압전박막의구조및전기적특성임미르 *, 권상효, 이웅희, 남산. 고려대학교 Demands for piezoelectric thin films have been sustainably increased since they aresuitable for various devices such as actuators, sensors, and energy harvesters. Unfortunately, Pb(Zr,Ti)O 3 (PZT)-based thin films, which possess excellent piezoelectric properties, canraise the environmental problem because it contains more than 60 wt% of PbO.Candidates forlead-free ceramics like BaTiO 3, bismuth layered compound and (Na,K)NbO 3 also have limitation because of the insufficient performanceandthe high growth temperatures. New type of lead-free piezoelectric superlattice thin films, which consist of the two different paraelectric oxide nanosheets, have been fabricated using Langmuir-Blodgett (LB) method and these piezoelectric superlattice thin films showed the promising piezoelectric properties. 60 한국세라믹학회

71 구두발표 However, LB deposition method is difficult to be utilized in industrial area. In this research, a new type of the lead-free piezoelectric thin film consisting of Sr 2 NaNb 4 O 13 and TiNbO 5 oxide nanosheets were fabricated at room temperature using the electrophoretic method. Moreover, the structural and piezoelectric properties of this lead-free piezoelectric thin film were investigated. This piezoelectric film showed the promising ferroelectric and piezoelectric properties of Pr = 7.3 μc/cm 2 and d 33 = 126 pm/v with the low dielectric low (< 0.05) and the leakage current density (< A/cm 2 at 0.3 MV/cm). Moreover, the electrophoretic deposition method is very simple and thus it can be easily used in the industrial area. In this work, the detailed growth processes and their effects on the electrical properties of the lead-free piezoelectric thin film will be presented. G1-6 Thickness-dependent Properties of Undoped and Mndoped PMN-PT Single Crystals 두께변화에의한압전 PMN-PT 단결정의유전및압전특성변화이호용 1*, 오현택 2, 김문찬 2, 주현재 2. 1 선문대학교, 2 ( 주 ) 세라콤세종류의 71PMN-29PT [71Pb(Mg 1/3 Nb 2/3 )O 3-29PbTiO 3 ] 압전단결정들 ((1) 고밀도단결정 [PMNT-HD; 상대밀도 99.5%], (2) 저밀도단결정 [PMNT-LD; 상대밀도 95%] 과 (3) Mn 첨가된고밀도단결정 [PMNT-Mn; 상대밀도 99.5%]) 을고상단결정성장법으로제조하여, 단결정의두께변화에따른압전단결정의유전및압전특성의변화를조사하였다. 단결정두께가 0.5 mm에서 0.05 mm로연속적으로감소하는경우, 유전상수, 압전상수 (d 33 와 g 33 ) 와두께모드전기기계결합계수등이감소하였으나, 유전손실은증가하였다. 그리고이러한두께에따른특성변화는 Mn 첨가없는고밀도단결정에서가장컸고, Mn 첨가된고밀도단결정에서는변화가거의없었다. Mn이첨가된 PMN-PT 단결정에서내부전기장 (Internal Electric Bias Field [E I ]) 의유도와항전계 (Coercive Electric Field [E C ]) 의증가를관찰하였다. 그리고 Mn이첨가되지않은단결정들에서관찰되는국부적인디폴링 (depoling) 현상이일어나지않아서, 0.1 mm 이하의두께에서도낮은유전손실과높은압전전압상수 (g 33 ), 두께모드전기기계결합계수 (k t ) 와압전에너지하베스팅효율을보였다. 최근에개발되고있는고주파수압전복합체, 고주파수의료용초음파진단기용프로브, 고주파수산업용비파괴검사용초음파프로브와플렉서블디바이스 ( 액추에이터, 센서, 스피커, 에너지하베스터등 ) 등에서는두께가 0.1 mm 이하인압전단결정들이적용되고있다. 이러한고주파수압전복합체및단결정응용부품에서는높은압전특성을가지면서동시에안정적인특성을보이는 Mn 첨가된 PMN-PT 단결정이가장적합함을보였다. G1-7 Effect of the Degree of Alignment in the Flexible Lead-free Piezoelectric Nanofibers on the Piezoelectric Characteristics 유연한무연압전나노섬유의정렬정도가압전특성에미치는영향지상현 1*, 조용수 2, 윤지선 1. 1 한국세라믹기술원, 2 연세대학교 The piezoelectric properties of flexible lead-free piezoelectric nanofibers were investigated according to the degree of alignment. The lead-free piezoelectric nanofibers of 0.78Bi 0.5 Na 0.5 TiO SrTiO 3 (BNT-ST) piezoelectric ceramics and poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) copolymers were prepared by an electrospinning method, and the degree of alignment of the piezoelectric nanofibers was controlled by the rotation speed of the collector. Field emission scanning electron microscope (FE-SEM) images and fast Fourier transform (FFT) images showed that as the rotation speed of the collector increased, the tendency to alignment of the BNT-ST nanofibers in one direction became stronger. The wellaligned BNT-ST nanofibers with a rotation speed of 1500 rpm had higher piezoelectric properties in piezoresponse force microscopy (PFM) results and polarization-electric (P-E) field hysteresis results, and the higher output voltage values were observed in the vibration frequency test and bending test. G1-8 Properties of Magnetoelectric Energy Harvester Fabricated by Laminating Piezoelectric and Magnetostrictive Materials 압전소재와자왜소재를적층하여제작한자기전기에너지하베스터의특성조유리 *, 강형원, 한승호, 김대수, 손신중. 전자부품연구원모바일기기나무선센서네트워크시스템의전력공급을위해서는배터리의사용이필수적이다. 무선기술의발달로인해요구전력량이늘어나면서배터리수명이단축되고있으며, 특히배터리를교체하거나교체가불가능할경우에시스템을교체하면서발생하는경제적인문제나이들을교체하는과정에서발생하는환경적인문제들을해결하고자많은노력이진행되고있다. 그중자가발전을통해영구적인전력공급이가능한친환경에너지하베스팅기술에대한연구가주목받고있다. 자기전기에너지하베스팅은자왜 / 압전복합소자의자왜효과 (Magnetostriction Effect) 와압전효과 (Piezoelectric Effect) 사이의자기에너지-기계에너지-전기에너지변환을이용한다. 자왜재료가자기장내에위치될경우자기장방향에따라기계적인자기변형이발생되며, 이렇게발생된기계적인변형은압전재료에전달되어전기에너지를발생시킨다. 본연구팀에서는송전선주변에버려지는자기에너지를이용하여송전선로감시시스템의전원으로사용되는 CT(Current Trans) 를대체할수있는자기전기에너지하베스터에대한연구를진행하였다. 이번연구에서는테이프캐스팅으로제조된압전시트와자왜시트를이종적층한후동시소성 (Co-firing) 하여자기전기소자를제작하였다. 제작된소자를이용하여외팔보 (cantilever) 구조의자기전기에너지하베스터를설계하였으며자기전기특성및임피던스매칭을통한최대전력특성을평가하였다. G1-9 Piezoelectric Energy Harvesting Module Designed to Operate at Various Resonant Frequencies 다양한공진주파수에서작동가능하도록설계된압전에너지하베스팅모듈손신중 *, 강형원, 한승호, 김대수. 전자부품연구원현대과학의발달에따라무선설비의적용범위가넓어지면서무선설비를작동시키기위한배터리의중요성이높아지고있다. 이를위해배터리의수명과질을높이기위한연구가많이진행되었지만여전히배터리의주기적인교체및공해에대한근본적인문제들이남아있는실정이다. 에너지하베스팅기술은주변환경에서발생되거나버려지는열, 빛, 진동, 압력같은에너지들을수확하여재사용하는친환경기술로, 영구적으로전력을공급할수있어배터리를대체하는기술로주목받고있다. 이중압전효과를활용한압전에너지하베스팅기술은기계적인진동에너지를전기적인에너지로변환시킬수있으며소형화가가능하고높은에너지변환효율을갖고있는장점이있다. 한편, 압전에너지하베스터의출력전력은공진주파수에서최대의에너지를발생시키며공진주파수에서멀어지면효율이급격하게감소하므로외부진동주파수와압전하베스터의고유진동주파수를일치시켜야 한국세라믹학회 61

72 2018 년한국세라믹학회춘계연구발표회 한다. 그러나외부진동원의주파수는환경마다모두다르기때문에압전에너지하베스터의고유진동주파수를적용할진동원에맞추어야할필요가있다. 본연구에서는외부진동에너지가압전체에극대화되어전달되도록디자인되도록모듈을디자인하였다. 그리고이모듈의압전소자개수및질량을조절하여공진주파수를제어하였으며, 이들간의상관관계를조사하였다. G1-10 Fabrication of MnBi Powder via Inter-diffusion Proces 김종우 *, 신용호, 안철우, 최종진, 한병동, 황건태, 민유호, 윤운하, 박동수. 재료연구소 Among the rare-earth free permanent magnets MnBi magnets have attracted features, i.e. strong magneticcrystalline anisotropy, high energy product and positive temperature coefficient of coercivity. MnBi magnets have been fabricated via so-called top-down process, i.e. starting from ingot casting or arc-melting to micro-sized crushed powder with long-period preparation processes. In this study, a novel Bottom-up fabrication method for MnBi has been used. With this bottom-up inter-diffusion process, the low-temperature-phase (LTP) was obtained notably, therefore an enhanced properties of MnBi was observed. The maximum energy product, (BH)max of MnBi synthesized via bottom-up process was about 7.9 MGOe, which is reasonable value for permanent magnet applications. A detailed optimization process of bottom-up process will be discussed in detail. G1-11 Complex Substitutional Effect on the Microwave Dielectric Properties of MgTi 1-x (B 1/3 Sb 2/3 ) x O 3 (B = Mg 2+, Zn 2+ ) Ceramics MgTi 1-x (B 1/3 Sb 2/3 ) x O 3 (B = Mg 2+, Zn 2+ ) 세라믹스의마이크로파유전특성에대한복합치환효과김재민 *, 김응수. 경기대학교 Microwave dielectric properties of MgTi 1-x (B 1/3 Sb 2/3 ) x O 3 (B = Mg 2+, Zn 2+, 0 x 0.125) ceramics were investigated. For the specimens sintered at 1450 o C for 4h, single phase of ilmenite structure was observed through the entire range of compositions. With increasing the substitution of (B 1/3 Sb 2/3 ) 4+ ions for Ti-site, the Qf values of the specimens were increased up to x = mole and then decreased. These results could be attributed to the change of electronegativity difference between Ti-site ions and O 2 ion. Even though the dielectric polarizability of (Mg 1/3 Sb 2/3 ) 4+ (3.287 Å) and (Zn 1/3 Sb 2/3 ) 4+ (3.527 Å) were higher than that of Ti 4+ (2.93 Å), the dielectric constant of the specimens decreased due to the larger ionic size of (Mg 1/3 Sb 2/3 ) 4+ (0.64 Å) and (Zn 1/3 Sb 2/3 ) 4+ (0.647 Å) larger than that of Ti 4+ (0.605 Å). Also, structural characteristics of the specimens were quantitatively evaluated by the Rietveld refinement method of the X-ray diffraction data. The highest Qf value (295,000 GHz) of the specimens was observed for MgTi (Mg 1/3 Sb 2/3 ) O 3. G1-12 Enhanced Pinning Properties of REBa 2 Cu 3 O 7-δ Superconducting Films with RE 2 O 3 (RE: Y, Eu, Gd) Addition Fabricated by Pulsed Laser Deposition PLD법으로증착한 RE 2 O 3 (RE: Y, Eu, Gd) 가첨가된 REBa 2 Cu 3 O 7-δ 초전도박막의향상된 pinning 특성오원재 1*, 박인성 1, 박유진 1, Kiran Shinde 2, 정국채 2, 유상임 1. 1 서울대학교, 2 재료연구소 We report the superconducting properties of REBa 2 Cu 3 O 7-δ (REBCO) thin films fabricated by pulsed laser deposition (PLD). According to previous studies, many authors reported the enhanced pinning properties of YBa 2 Cu 3 O 7-δ (YBCO) and REBCO films by introducing the 1-D defects such as BaMO 3 (BMO, M=Zr, Sn, Hf, etc) nanorods and 3-D defects such as Y 2 O 3 and Gd 2 O 3 nanoparticles into superconducting matrix. The Eu 2 O 3 -doped EuBCO and Gd 2 O 3 -doped GdBCO films show the enhanced pinning properties at relatively low temperature (< 40 K) while the Y 2 O 3 -doped YBCO films have the improved critical current density (J c ) at relatively high temperature (77 K). So, we tried to investigate the effect of the Y 2 O 3 nanoparticles on the pinning properties in the REBCO (RE: Eu, Gd) matrix. The both undoped and RE 2 O 3 -doped REBCO films were fabricated by PLD using KrF (λ = 248 nm) laser on CeO 2 -buffered MgO (100) single crystal substrates. The RE 2 O 3 -doped REBCO films were deposited by varying the area of RE 2 O 3 sector which was attached on the top of REBCO target. The Y 2 O 3 -doped REBCO films show a slight T c,zero drop compared with the Eu 2 O 3 -doped EuBCO films and Gd 2 O 3 -doped GdBCO films, which might be responsible for a solid solution. Further details will be presented for a discussion. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No ). And Part of this study has been performed using facilities at IBS Center for Correlated Electron Systems, Seoul National University. G1-13 The Growth Processes of GdBa 2 Cu 3 O 7-δ Superconducting Film based on the Stability Phase Diagram 상안정도기반의 GdBCO 초전도박막성장프로세스박인성 1*, 오원재 1, 이재훈 2, 문승현 2, 유상임 1. 1 서울대학교, 2 ( 주 ) 서남 Based on the stability phase diagram of GdBa 2 Cu 3 O 7-δ (GdBCO) for the nominal composition of Gd : Ba : Cu = 1 : 1 : 2.5, which has been employed for the fabrication GdBCO coated conductors via the reactive co-evaporation deposition and reaction (RCE-DR) process, GdBCO phase is formed by reaction of Gd 2 O 3 + L 1 Gd 2 CuO 4 + L 2 GdBCO + Gd 2 CuO 4 + Cu 2 O. Though there have been many efforts to enhance the pinning properties, however, a weak pinning property has been the most serious problem for GdBCO coated conductors via RCE-DR. For this study, to improve the pinning properties, we investigated the effect of size-refined Gd 2 O 3 particles which are trapped in the superconducting matrix via the process condition of maximized nucleation rate and minimized growth rate based on the stability phase diagram of GdBCO for the nominal composition of Gd : Ba : Cu = 1 : 1 : 2.5. Details will be presented for a discussion. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No ). G1-14 Effects of Ni Content on Electrical Properties of Coppernickel Manganite Thin Films 구리-니켈망가나이트박막의전기적특성에미치는니켈함량의영향최용호 *, 전창준, 정영훈, 윤지선, 백종후, 홍연우, 조정호. 한국세라믹기술원 62 한국세라믹학회

73 구두발표 [(Ni x Mn 1-x ) 0.84 Cu 0.16 ] 3 O 4 (0.2 x 0.4) thin films were fabricated by metal-organic decomposition to develop new thermal imaging materials applicable to microbolometer. The effects of Ni content on the mocrostructure and electrical properties of the annealed films were studied. The thin films annealed at 380 C for 5 h in air showed a thickness below 100 nm. The microstructure of the annealed films was remarkably affected by the Ni content. A single phase of cubic spinel structure was confirmed in all of the annealed films. The resistivity of the annealed films decreased with increasing Ni content due to the improved surface morphology. The hopping mechanism between Mn 3+ and Mn 4+ was also discussed from cation distribution obtained by XPS analysis. Finally, the relationship between Ni content and temperature coefficient of resistance (TCR) was investigated in relation to thermal stability of the thin films. G1-15 The Effects of Additive Coposition on the Density and Resistivity of Sintered Alumina 첨가제의조성이알루미나소결체의밀도및저항에미치는영향유창민 1*, 이창현 2, 신효순 1, 여동훈 1, 김성훈 3. 1 한국세라믹기술원, 2 고려대학교, 3 신라대학교알루미나는구조적특성이우수할뿐아니라유전특성또한뛰어나안정적인전자기및구조용소재로적용분야를넓혀가고있다. 반도체나디스플레이공정에사용되는정전척은내화학성과내마모성이우수할뿐아니라유전특성또한우수하다. 그러나최근전압인가에따른 chucking 특성향상을위하여더높은저항특성이요구되고있지만전극과의접착력확보및소결성확보등을동시에만족해야하므로알루미나소재의소결첨가제선정에한계를가지고있다. 최근업계의요규를수용하기위한고저항특성에대한필요성은증가하고있지만이들에대한소결성과신뢰성을동시에고려한조성개발에대한연구는아직미비한실정이다. 따라서본연구에서는 1600 o C 이하에서소결이가능하고높은밀도를확보할수있으며, 저항소재와접착력이확보될수있는조건에한정하여높은저항을갖는알루미나기반첨가제조성을설계하고자하였다. 실험에사용된첨가제는 SiO 2, MgO, Y 2 O 3 그리고 CaO를선정하였으며, 이들첨가제는균일한미세구조확보, 소결온도감소및계면저항변화등에영향을주는것으로문헌및선행연구결과를통하여알려진것이다. 조성설계는주원료인알루미나 90% 이상의혼합조건에서첨가제들의혼합비율을조정하는방법으로진행하였고이들조성에따른밀도및저항을관찰하고자하였으며, 이때내부전극과의동시소성을고려하여환원분위기에서소결한결과를제시하고자한다. G1-16 High Temperature Equilibrium Point Defect Structure of γ-na x CoO 2 γ-na x CoO 2 의고온결함구조주원효 *, 류한일, 주영창. 서울대학교 Oxygen nonstoichiometry and electrical conductivity were measured on the system of γ-na x CoO 2, one of the best p-type thermoelectric oxide, against oxygen activity across its widest ever range below O 2 atmosphere for a fixed Na-content x = at K, and at a fixed temperature 973 K for x = 0.664, 0.706, Meanwhile, combining reported information of γ-na x CoO 2 and defect chemistry principles, ideal defect model was established, and oxygen nonstoichiometry and electrical conductivity arising therefrom were compared to the experimental results. It has been deduced that as oxygen activity decreases from O 2 atmosphere, the majority disorder type shifts from [V Na ] = p to either [V Na ] = 2[Co Na ] or [V Na ] = 3[Co i ], exhibiting a positive deviation from the ideal defect behavior which is ascribed by degeneracy of hole. By taking into account of proper approximation of Fermi-Dirac integral of order 1/2, the nonstoichiometry and electrical conductivity have been precisely and consistently depicted to evaluate the defect-chemical parameters including the effective mass and mobility of holes and the redox equilibrium constant. G1-17 Development of Red CaAlSiN 3 :Eu 2+ Phosphor in Glass Ceramic Composite for Automobile LED with High Temperature Stability 고온안정성이우수한자동차 LED용 Red CaAlSiN 3 :Eu 2+ 형광체 / Glass 세라믹복합체개발이정우 *, 차재민, 심승언, 김성혁, 오택호, 윤창번. 한국산업기술대학교고온열특성및신뢰성특성이우수한 620 nm CaAlSiN 3 :Eu 2+ 계형광체를 Glass 봉지재에실링한 Red full conversion 형광체 /Glass 복합체세라믹플레이트를제작하였다. 저온소결용고투과율무연실리케이트 Glass 파우더 60~80 wt% 와상용 620 nm 파장의 CaAlSiN 3 :Eu 2+ 형광체 20~40 wt% 를혼합하여 Phophosr in Glass (PiG) 를제작하였다. 일반적인파우더프레싱방법을압착된파우더를 CIP를통해치밀화하였고, 550도에서열처리하여 PIG를제작하였다. 제작된형광막은 30% 형광체 /70% 유리조건에서고밀도를가진소결체를구현하였고, Full Conversion 되는형광막조건을확보하고자두께를변경하면서전장용 Blue LED에실장하여광학특성을평가하였다. 광학 Spectrum과색좌표거동을측정한결과약 180 um에서 99% 이상의색순도를가진 620 nm Red LED가제작된것을확인하였다. 열적안정성을평가하기위해서상온에서 150도까지승온하면서 Thermal Quenching 특성을평가한결과기존의 AlGaInP계 Red Chip을사용한 PKG 대비약 30% 이상우수한온도특성을보이고있다. 이러한 Full Conversion PIG 는 Cutting과전사공정을통해 Micro-LED에적용한다면광변환소재로매우적합할것으로보인다. G1-18 Enhancement of ME Coupling Performance by Optimization of Interfacial Adhesion Layer 접착층최적화를통한자기-전기복합체의성능극대화황건태 1*, Haribabu Palneedi 1, 민유호 1, 김종우 1, 안철우 1, 최종진 1, 한병동 1, 류정호 2. 1 재료연구소, 2 영남대학교 The magnetoelectric (ME) composites formed by combining of magnetostrictive and piezoelectric materials, are increasingly investigated due to their potential for energy harvesters, magnetic field sensors, transducers, and gyrators. When magnetic field is applied on the ME composite, the mechanical deformation from the magnetostictive material is transferred to the piezoelectric part, thus resulting in inducing of polarization due to the piezoelectric effect. Accordingly, strong interfacial coupling between the two materials is essential to acquire the maximum ME output. For this reason, optimization of the epoxy adhesive responsible to the coupling between the two phases have to be studied for reinforcement of the conversion efficiency of ME effect. This work reports the effect of bonding adhesive on the ME composite. We tested several types of epoxy adhesion and modified the curing condition of coupling layer. 한국세라믹학회 63

74 2018 년한국세라믹학회춘계연구발표회 S11-1 The Increasing Demand for Electronic Components due to Electronification and Digitalization of All Devices & the Current and Trends of MLCC 전자화, 디지털화에따른전자부품의수요증가현황과 MLCC의현재와향후추세김민기 *, 윤중락. 삼화콘덴서공업 ( 주 ) 전자회로의주요수동부품의하나인세라믹콘덴서는 2010년대중반까지성장과성숙시기를거치며, 시장및기술의포화현상을보였다. 이러한기조는 2010년대후반기에접어들면서시장수요가크게증가하는양상을보이고있다. 이는친환경자동차및자율주행자동차를중심으로장치의전자화, 디지털화와복합기능스마트장치와 IoT를중심으로수동전자부품을포함한전반적인전자부품의수요증가에기인한것이다. 적층형세라믹콘덴서 (MLCC) 는스마트폰을중심으로주요부품인 IC, 카메라의고사양화및다양한센서의채택과신기능이추가되는추세에있기때문에부품의크기는작고용량은대용량을갖는고온, 고압에서의특성이중요하다. 소재및공정기술의발전및개발을통해고신뢰성및고온특성과고압 / 고전류특성이요구되는자동차용부품에있어서도응용분야가증가하고있다. 이는친환경자동차및자율주행자동차분야에서다양한센서의적용과부품의고성능화, 복잡화에따른소형 ECU의적용수량이증가함에따라부품의소형, 대용량, 고전력소모내구성과고온, 고압특성을충족하는부품의개발및채택이증가하고있기때문이다. 자동차에적용되는전장부품은고온특성및각종열악한환경에서의신뢰성이확보되어야만한다. 다양한소재의조합기술과공정기술을확보하는한편고신뢰성소재공급을위한원천소재개발이장기적인목표를가지고집중한다면, 세라믹기반소재를중심으로한부품기술로미래산업의중심이되는자동차시장에서경쟁력을가질것으로기대한다. S11-2 The Current Trends of the Thick Film Technology and the Applications of the Piezoelectric and the Dielectric Ceramic Materials 후막세라믹기술의발전동향과압전및유전소재응용신효순 *. 한국세라믹기술원후막세라믹기술은 MLCC(Multi layer ceramic capacitor) 와 LTCC(Low temperature co-fired ceramic) 로대표되는세라믹수동소자와통신부품을중심으로발전하여왔다. 이들은세계적으로대표기업을중심으로소형화와고성능화경쟁이이루어지고있으며그수요또한전자산업의발전에따라꾸준히증가하고있다. 최근, 이러한후막세라믹기술은다양한응용분야로그적용의폭을넓히는추세에있다. 압전적층형엑추에이터, probe card용 space transformer, 반도체공정용 ESC 등특별한용도에후막세라믹기술이적용되고있으며산업화로이어지고있다. 그리고다양한분야에서융복합소재의활용분야가증가함에따라유무기복합소재의성형공정으로후막공정기술이적용되는사례또한매우증가하고있다. 이결과후막세라믹기술은세라믹또는융복합소재부품제조공정의핵심으로자리잡고있다. 따라서본발표에서는이러한후막세라믹기술의발전동향에대한 review 와함께다양한업계의동향을소개하고이들중하나인 Cu 내부전극을활용한 PZT계적층형압전엑추에이터개발을위한저온소결용압전조성개발및차세대 ESC 적용을위한고저항동시소성유전체소재개발에관한결과등최근개발사례를중심으로소개하고자한다. S dimensional Dielectric Nanosheets for Next-generation Electronicdevices 차세대전자소자용 2차원유전체나노시트최지원 *. 한국과학기술연구원 High-dielectric-constant (high-k) materials have been required for various electronic devices such as multilayer ceramic capacitors, thin film transistors, and gate insulators. The direction of improvement in these devices generally has been going toward the miniaturization with higher dielectric constant and lower dielectric loss, but there is a limitation for downsizing. As the next generation high-k materials, the technology of two-dimensional (2D) nanosheets have been attracted a lot of interest due to its special properties such as great electrical properties, single crystal nature, and its thin thickness. Particularly, the Dion-Jacobson phase 2D perovskites has been received attention because not only bulk ceramics show colossal permittivity but also exfoliated nanosheets thin films show high-k dielectric permittivity even for thickness down to 20 nm. Besides, 2D nanosheets thin films are undisturbed for the thickness and don t require annealing process because of its crystalline nature. Several 2D dielectric materials have been reported, but the dielectric permittivity is still far below than bulk value. Therefore, we have been studying on searching new composition Dion-Jacobson phases based on niobate by A-site mofidication to enhance their dielectric properties. In this presentation, I will discuss not only the properties of A-site modified Sr 2 Nb 3 O 10 nanosheets thin films but also the properties of its starting materials. 2D dielectric thin films showed great dielectric properties with low leakage current density. Therefore, these 2D nanosheets are expected for using in future dielectric applications and also used as a functional materials for ferromagnetics, redox-active materials, and photochromics. S11-4 Dielectric Ceramics and Related Technologies for Pulse Energy Storage Capacitors 펄스에너지저장캐패시터용유전체세라믹스소재및관련기술권도균 *. 한국항공대학교 The present trends of enhanced mobility, connectivity, and reliability in consumer, industrial, and military electronics will continue to drive future innovations in ceramic capacitor technology. Especially, power electronics applications are an emerging market in which ceramic capacitors will play an increasing role through improved breakdown strength, enhanced dielectric stability in harsh environments, and innovative packaging. The government lead investments to develop next generation weaponry system such as railguns will also contribute to the advancement of dielectric materials technology for pulse and power electronic capacitors. The dielectric materials are capable of storing the electric energy due to its polarization in the presence of external electric field, causing positive charge to store on one electrode and negative charge on the other. With this manner, the dielectric energy-storing devices enable faster delivery of energy (i.e. shorter charge or discharge time), and thus can be found promising applications on hybrid electric vehicles and pulse power devices. To design a proper dielectric material for the energy storage application, three requirements have to be satisfied at the same time: large saturated polarization, small remnant polarization, and high electrical breakdown strength. In addition to that, cutting-edge technology in 64 한국세라믹학회

75 구두발표 automotive industries also requires high-temperature capacitors operable at high temperatures >200 o C. Wide variety of dielectric materials systems including ferroelectric copolymers/blends, glass, high-k ceramics, and their composites have been intensively investigated. Approaching methodology, materials synthesis and characterizations in the research activities on this subject are being extensively introduced and discussed with special emphasis on the improved dielectric stability of the newly designed 2-dimensional ceramic nanosheets based nanocomposites. S11-5 Thermo-Magneto-Electric Generator for Low-grade Thermal Energy 저온도구배열에너지를위한열-자기-전기발전기송현철 1*, Deepam Maurya 2, Shashank Priya 3. 1 한국과학기술연구원, 2 Virginia Tech., 3 Penn. State University New mechanisms for converting thermal energy into electricity are highly desired. Thermoelectric devices that convert thermal energy directly into electrical energy have been widely investigated. However, thermoelectric energy harvesters typically show low output power and efficiency at low temperature gradients. Further, there is increasing difficulty in enhancing the magnitude of figure of merit (ZT) in the bulk materials. To overcome these limitations, we present the concept of Thermo-Magneto-Electric Generator (TMEG) that exploits the ferromagnetic phase transition of soft magnetic materials to drive the movement of the piezoelectric cantilever whose mechanical energy is converted to electrical energy. To operate TMEG, the fundamental challenge lies in synthesizing soft magnetic materials that exhibit magnetic Curie temperature close to the room temperature while possessing high saturated (M s ) and remnant (M r ) magnetization with small coercive field (H c ). La 1-x Sr x MnO 3 system is known to exhibit the insulator to metal phase transition at room temperature that can be tuned by modulating the Sr (x) content. In this study, we describe the composite material design using base La 0.85 Sr 0.15 MnO 3 (LSMO) composition and modifying with Ni 0.6 Cu 0.2 Zn 0.2 Fe 2 O 4 (NCZF) in order to achieve large M r and M s, while maintaining its soft magnetic nature. We further provide the demonstration of TMEG employing the soft magnetic composites for active heat recovery systems. S11-6 Determination of Electronic and Ionic Conductivity in Dielectric Materials 유전체물질에서전자전도와이온전도의거동과구분이순일 *. 창원대학교 The ionic and electronic conductivities of nonstoichiometric BaTiO 3 (undoped, Ca-doped, and Zr-doped BaTiO 3 δ ) ceramics were investigated through high temperature equilibrium conductivity (HiTEC) and in-situ impedance measurements at various equilibrium conditions with different oxygen partial pressures over a temperature range of C. Contribution of mobile oxygen vacancies on the electrical conductivity has been determined by HiTEC measurement as a function of oxygen partial pressure; the electrical conductivity with mobile oxygen vacancies shows a broad transition from p-type to n-type, and thereby there is an increase of the minimum conductivity at the n p transition point. Through combining in-situ impedance spectroscopy measurements with the HiTEC measurements, it was confirmed clearly that the mobile oxygen vacancy contributes to the total conductivity, and the oxides become mixed conductors around the n p transition regime (minimum electronic conductivity regime). It was found that Warburg impedance can be observed at the condition of tion/telectronic 0.05 in the temperature range of C and po 2 range of atm. The ionic conductivity varied with the concentration of extrinsic oxygen vacancies and dopants, and the activation energy for mobility of oxygen vacancy in Ca-doped BaTiO 3 δ was found to be 1.04 ± 0.05 ev using the two techniques in a very good agreement. S11-7 Ferroelectric and the Temperature Stability in Dielectric Properties of Lead-free BiFeO 3 -BaTiO 3 based System BiFeO 3 -BaTiO 3 계비납계유전체의강유전특성및유전특성의열적안정성 Akram Fazli 1*, Malik Rizwan Ahmed 1, Salman Ali Khan 1, Ali Hussain 2, Soonil Lee 1, Tae-Kwon Song 1, Won-Jeong Kim 1, Myong- Ho Kim 1. 1 창원대학교, 2 Institute of Space Technology The lead-free (1 x)(0.675bifeo BaTiO 3 ) MnO CuO-xLiTaO 3 (abbreviated as BFBT-xLT, where x = 0-3 mol%) dielectric ceramics were fabricated by conventional solid-state reaction route. The effect of LT-content on the crystal structure, morphology, ferroelectric behavior, and the temperature-stable dielectric properties has been investigated. The XRD results revealed that BFBT xlt dielectrics are composed of pseudocubic perovskite crystal structure in the selected compositional range. The micrographs recorded from the scanning electron microscope (SEM), provided an overall dense for the ceramics. At x = 0.010, the values of maximum polarization (P m ) and remnant polarization (P r ) were obtained to be 24 μc/cm 2 and 18 μc/cm 2, respectively. The pure composition (BFBT) was ferroelectric; by incorporation of LT a gradual change from ferroelectric to relaxor phase occurred, with broad frequency dependent curves (1-100 khz) of dielectric mid-value permittivity (ε rmid ) and dielectric loss (tanδ) as a function of temperature. Among them, BFBT 0.03LT met the requirement of capacitance variation ( ±15%), ε rmid = 5000±9.5% ( o C at 1 khz) with moderate ε r = 650 (at room temperature). It is found that LT addition satisfied the high temperature dielectric specification. S11-8 Effects of B site Donor Modification on the Crystal Structure, Ferroelectric and Piezoelectric Properties of Lead-free (0.65BiFeO BaTiO 3 ) Ceramics 0.65BiFeO BaTiO 3 계비납계세라믹의결정구조, 강유전및압전특성에대한 B-site Donor 치환효과살만알리칸 1*, Malik Rizwan Ahmed 1, Akram Fazli 1, Ali Hussain 2, 이순일 1, 송태권 1, 김원정 1, 김명호 1. 1 창원대학교, 2 Institute of Space Technology In this work the lead-free piezoelectric ceramic 0.65Bi 1.05 Fe 1-x Ti x O BaTi 1-y Nb y O 3, where x and y = 0, 0.01, 0.015, 0.02, and 0.025, abbreviated as BFT-BTN, were synthesized by a solid-state reaction method followed by air quenching process. The effects of B site donor modifications (Nb 5+ and Ti 4+ ) on crystal structure, morphology and electrical properties of the BF BT ceramics have been investigated. X-ray diffraction patterns showed the formation of pure perovskite structure, without any secondary phases. Scanning electron 한국세라믹학회 65

76 2018 년한국세라믹학회춘계연구발표회 microscope (SEM) micrographs revealed that average grain size of the BF BT ceramics decreased with the addition of B site donor. Improvements in ferroelectric properties (P E loops) and electric field-induced strain properties (S E loops), were obtained at the optimum composition of BFT BTN ceramics. In addition, the dynamic piezoelectric coefficient (d * 33) was enhanced from 265 pm/v for (BFT BTN-0) to 360 pm/v for (BFT BTN-1) at driving field of 5 kv/mm. S11-9 Electrical Properties and Conduction Mechanism of Aliovalent Ion doped BiFeO 3 Ceramics BiFeO 3 세라믹스의이종원자가이온도핑에대한전도메카니즘및전기적특성박철민 1*, 우정욱 1, 김준찬 1, 이순일 1, 백승봉 1, 송태권 1, 성연수 2, 김명호 1. 1 창원대학교, 2 POSTEC Bismuth ferrite (BiFeO 3 ), a perovskite material, is a well-known multiferroic material due to its interesting ferroelectric and ferromagnetic properties. In this work, we synthesize aliovalent ions doped BFO ceramics by a conventional solid-state reaction method. The structural, dielectric and high temperature conduction properties were investigated. Incorporation of the excess amount of Bi 2 O 3 decreased the Bi volatility in BFO ceramics. Polarization versus electric field (P-E) hysteresis loops and dielectric properties were enhanced with Bi 2 O 3 addition. To better understand the defect effects on the multiferroic properties, the electrical conductivity was measured under various oxygen partial pressures (po 2 ) at high temperatures. The point defects and energetics in terms of thermodynamics will be discussed in details. S11-10 Large Electric Field Induced Strain in Bismuth Ferritebased Lead-free Piezoceramics BiFeO 3 계비납계압전체의고전압인가에따른변형률 Malik Rizwan Ahmed *, Akram Fazli, 살만알리칸, 송태권, 김원정, 이순일, 김명호. 창원대학교 Lead-free (1 x) (0.67BiFe 1.05 O BaTiO 3 )-x Bi(Mg 0.5 Zr 0.5 )O 3, abbreviated as BF-BT-BMZ (x = ), and (1 x) (0.67Bi 1.05 FeO BaTiO 3 )-x LiNbO 3, abbreviated as BFBTLNx (x = ), piezoelectric ceramics were fabricated by conventional solid state method. It was found that the incorporation of BMZ and LN into BF- BT host system caused slight change in crystal structure. For BF-BT- BMZ system, the x = composition showed enhanced electric field-induced strain properties with dynamic piezoelectric constant S max /E max = d * 33 = 440 pm/v at a relatively low field of 3 kv/mm, along with a high Curie temperature T C = 435 C. Furthermore, at optimum composition (x = 0.010), large dynamic piezoelectric constant d * 33= 500 pm/v at a relatively low field of 3.5 kv/mm was obtained in BFBTLN system. Large electric-field induced strains at low driving field combined with high T C make these systems suitable for high temperature piezoelectric devices. S11-11 Magnetoelectric Film Heterostructure of Textured Pb(Zr,Ti)O 3 /Ni with Superior Performance Haribabu Palneedi *, 류정호, 황건태. 재료연구소 A flexible, high-performance magnetoelectric (ME) heterostructure of PZT/Ni was fabricated by depositing a piezoelectric ceramic film of (001) oriented Pb(Zr 0.52 Ti 0.48 )O 3 (PZT) on a magnetostrictive substrate of thin, flexible Ni foil buffered with LaNiO 3 /HfO 2. The PZT/Ni composite exhibited superior ferroelectric properties together with a large ME coupling of 3.2 V/cm Oe, which were attributed to the strong texturing of the PZT film, coupled with the compressive stress in the piezoelectric film. Besides, reduced substrate clamping in the PZT film due to the film on foil structure and strong interfacial bonding in the PZT/LaNiO 3 /HfO 2 /Ni composite heterostructure could also have contributed to its high ME performance. The PZT/Ni composite outperformed other known ME film composites based on PZT/Ni as well as those composites of textured PZT films deposited on magnetostrictive oxide substrates. The superior performance ME film heterostructure is promising for metal-based MEMS devices and flexible electronic applications. S11-12 A New Type of Ultra-thin Film Pseudocapacitors Produced Using 2-D Metal Oxide Nanosheets 2-D메탈옥사이드나노시트를이용한초박막슈퍼캐패시터이웅희 *, 권상효, 임미르, 남산. 고려대학교 Pseudocapacitors fabricated using the metal oxide-based materials have been widely investigated because they showed the higher specific capacitance than the electric-double-layer capacitors. Recently, a new type of pseudocapacitor, which is produced using twodimensional (2-D) metal oxides, has been reported and the charge and discharge processes of these pseudocapacitors were explained by the cation intercalation mechanism. Particularly, a planar-type pseudocapacitor has been intensively studied because the smooth migration of cations occured in between the 2-D materials. In this study, the two symmetric working electrodes of the pseudocapacitors were fabriated using the Sr 2 Nb 3 O 10 (SNO) nanosheets. The SNO nanosheets were obtained from KSr 2 Nb 3 O 10 (KSN) ceramics using soft-chemical exfoliation. These SNO nanosheets have a large aspect ratio that is useful for the ultra-thin film pseudocapacitor. The exfoliated SNO nanosheets were deposited on a Pt/glass substrate with a planar-type pattern. Langmuir-Blodgett method was used for making ultra thin film using the SNO nanosheets at room temperature. The fabricated SNO electrodes showed the specific capacitance of 270 uf/cm 2 at current density of 2.5 ua/cm 2 and the cycling stability with capacitance retention of 86% after 5000 charge and discharge cycles in PVA/LiCl electrolyte. In addition, the structural and electrochemical properties of the SNO electrodes with various thicknesses were investigated. S11-13 Electro Caloric-Effect and Electric Field Induced Phase Transition of (Bi 1/2 Na 1/2 )TiO 3 -SrTiO 3 Relaxor Ferroelectric Ceramics (Bi 1/2 Na 1/2 )TiO 3 -SrTiO 3 완화형강유전체세라믹스의전기장유도상전이및전기열량효과김대수 1*, 천채일 1, 강형원 2, 이형규 2, 한승호 2, 김정석 1, 김빛찬 1. 1 호서대학교, 2 전자부품연구원전기열량효과 (Electro Caloric Effect, ECE) 는단열조건하에서강유전재료에전기장을인가할때분극변화에따른엔트로피의변화로부터발생하는온도변화를말한다. 최근이효과를이용하여친환경냉각소자를개발하려는연구가진행되고있다. 유전분극의무질서한상태와정렬된상태사이의엔트로피차이는높은 ECE를얻는데직접적으로연관이있다. 완화체 (Relaoxr) 는일반적 66 한국세라믹학회

77 구두발표 으로거시적인자발분극을형성하지않으며, 전기장을인가하더라도작은규모의선형적인분극증가를보일뿐이다. 하지만, 일부완화형강유전체 (Relaxor Ferroelectrics) 는일정온도구간에서큰전기장을인가하면완화체상에서강유전상으로전이가발생한다. 이러한전계유도 1 차상전이에의해임계전기장에서분극의급격한증가가발생하며, 이때나타나는큰엔트로피의차이는높은 ECE 를나타낼것으로기대된다. 주로 Pb(Mg,Nb)O 3 -PbTiO 3 나 (Pb,La)(Zr,Ti)O 3 등의연계강유전또는완화형강유전재료에서큰 ECE 가보고되었으나, 최근세계적인친환경규제로인하여비연계재료의연구가필요하다. 비연계완화형강유전체인 (Bi,Na)TiO 3 (BNT) 계고용체세라믹스는상온근처에서특정임계전기장인가하에완화체상에서강유전상으로상전이가발생하고, 이로인한잔류분극이억제된이중이력곡선이관찰되어높은 ECE 를나타낼것으로기대되는물질이다. 이번실험에서는 (Bi 1/2 Na 1/2 )TiO 3 -SrTiO 3 완화형강유전체를제조하여전계유도상전이거동과 ECE 를조사하였다. X- 선회절분석과유전율의온도의존성으로부터상전이거동을조사하였다. 다양한온도와전기장하에 P-E 이력곡선을측정하였고, Maxwell 관계식을이용하여 ECE 에의한단열조건의온도변화를간접적으로계산하였다. 그리고다양한전기장하에 ECE 에의한시편표면의온도변화를열전쌍으로직접측정하여간접적인측정결과와비교하였다. 이러한결과를토대로임계전기장에서의전계유도상전이와 ECE 와의관련성을토의할예정이다. S11-14 Characteristic Evaluation of Pressure-Light Muliti Sensor using Long-term Stable MAPbI 3 Thin Films by CVD CVD 법으로증착된장기안정성 MAPbI 3 박막을이용한압력-광량멀티센서특성평가엄지호 *, 윤순길. 충남대학교 MAPbI 3 는유기물과무기물의혼합물로태양광에너지하베스팅소자에활용되고있으나, 압전소재의대표적구조인페로브스카이트구조를가지고있어압전특성또한가지는것으로알려져있다. 이와같이광전특성과압전특성을모두가지고있는 MAPbI 3 페로브스카이트소재를사용하면압전-광전멀티특성을지닌에너지하베스터, 또는압력-광량멀티센서를만들수있을것으로예상된다. 하지만, 기존의 MAPbI 3 소재는낮은장기안정성으로대기중에서금방분해되기때문에이를해결하는연구또한진행되어야한다. 이실험에서는기존의 Sol-Gel 법에비하여높은장기안정성을가지는화학기상증착법을이용하여증착된 CH 3 NH 3 PbI 0 (MAPbI 3 ) 박막을이용하여압력과광량에반응하는멀티센서에활용하였다. 그결과, CVD를이용하여증착한 MAPbI 3 박막은기존의 Sol-Gel 법을이용한 MAPbI 3 박막에비해 10배이상높은수준인한달이상의장기안정성을나타내었다. CVD로증착한 MAPbI 3 박막을이용하여제작한멀티센서소자는 8.34 mv/kpa-1 과 0.02 na/kpa-1의압력민감도를보였으며광량에따른민감도또한보였다. 이결과를통하여단일소재에서여러감각을측정할수있는멀티센서의개발가능성을보았다. S12-1 First-principles Design of Memcapacitors for Neuromorphic Computation 뉴로모픽컴퓨팅을위한멤커패시터소재제일원리발굴이준희 *. 울산과학기술대학교 We initiate materials genome research which can solve many technological issues with computation. Understanding various interactions among charge, spin, and lattice (so called materials gene ) implies endless possibilities for material engineering. I will talk about how to design multi-level dielectrics (memcapacitors) for developing neuromorphic computations with ultralow energy consumption. The materials candidates identified by first-principles calculations are magnetic perovskites such as SrMnO and SrCoO 3 which have strong coupling among the materials genes. I will highlight the importance of first-principles genomic design with advanced computation power by proposing new thin-film geometries for the materials candidates for next-generation computation devices. S12-2 Emergence of Multi-Capacitance in Tensile-strained SrMnO 3 Thin Films 격자인장된 SrMnO 3 박막에서의다중정전용량특성발현이상한 *. 광주과학기술원다중정전용량유전체소재는일반적인커패시터의특성과멀티레벨정보저장능력을모두갖고있어, 기존의회로개념을완전히혁신함으로써, 반도체기술이직면한최대의문제인전력소모량증가문제를원천적으로해결가능하다. 그러나일반적으로정전용량을결정하는유전상수는재료의고유상수로써단일물질에서다중의유전상수를갖는사례는현재까지보고된바없다. 본연구에서는상유전체 SrMnO 3 박막에격자인장을통해다중유전상수를갖는단일박막을구현하고자한다. 상유전성, 반강자성을갖는 SrMnO 3 의경우, 최근여러연구팀을통해격자인장및축소를통해준안정상으로다양한상변이가가능할것이라고이론적으로예측되었고, 이러한상변이를통해강유전성, 강자성을동시에가지는, 즉다강성을가질수있는재료로서각광받고있다. 이를기반으로본연구에서는 ~2% 의격자인장시스핀과유전성결합에의한다중상전이를유도하여전기장인가에따라 SrMnO 3 의유전상수가평면방향으로는 ~200%, 수직방향으로 ~50% 변조될수있음을 DFT 계산을통해확인하였다. 따라서이러한 SrMnO 3 의격자와 ~2% 의격자미스핏을갖는, 수평방향의유전특성확인을위한 LSAT 기판및수직방향의유전특성확인을위한 Nb-STO기판에 Pulsed laser deposition (PLD) 방법으로격자인장된에피텍시얼한 SrMnO 3 박막을구현하였다. 먼저 LSAT 기판에성장된 SrMnO 3 박막에서 20, 45, 69, 92, 115 nm두께로박막을형성하였고, 박막의두께가증가함에따라기판스트레인효과가감소되므로격자인장이완화되는것을 XRD 측정을통해확인하였다. 또한이러한 SrMnO 3 의유전특성을확인시, 격자인장율의변화를통해 SrMnO 3 의유전상수가 7~140까지변화하는것을확인할수있었다. 특히 1.7% 로기판에완전히격자인장된 20 nm 두께의 SrMnO 3 는가장높은유전상수 ( 약 140) 와강유전히스테리시스곡선을갖는것을최초로확인하였다. 또한 Nb-STO 기판위에성장된 SrMnO 3 박막의경우단일박막에서전압의변조를통해 3개의다중유전상수를갖는것을확인하였고, 각전압에서오랜시간측정에도다중의유전상수가유지되는것을확인하였다. 이러한 SrMnO 3 단일박막과같은다중유전상수를갖는소재의확인은기존반도체소자의한계를극복하는새로운멤커패시터소자시대의도래를가능하게한다. S12-3 Hafnia Ferroelectric Device for Semiconductor Device Applications 반도체소자응용을위한하프니아강유전체소자전상훈 *. 한국과학기술원 한국세라믹학회 67

78 2018 년한국세라믹학회춘계연구발표회 Recently, various hafnia ferroelectric materials and devices have attracted significant attention for various semiconductor device applications such as RFID, MEMS and RAM device applications. Hafnia ferroelectric films with orthorhombic phase are suitable for ultra-thin ferroelectric capacitor and gate stack for 1T ferroelectric FeRAM. In this talk, we are going to deal with research trends regarding various semiconductor device applications such as basic ferroelectric material properties, negative capacitance phenomena, and ferroelectric tunneling behavior. S12-4 Resistive Switching Memories based on Halide Perovskites 할라이드페로브스카이트기반저항변화메모리장호원 *. 서울대학교 CsPbX 3 (X = halide, Cl, Br, or I) all-inorganic halide perovskites (HPs) are regarded as promising functional materials because of their tunable optoelectronic characteristics and superior stability to organicinorganic hybrid halide perovskites. Herein, nonvolatile resistive switching (RS) memory devices based on all-inorganic CsPbI 3 perovskite are reported. An air-stable CsPbI 3 perovskite film with a thickness of only 200 nm is successfully synthesized on a platinumcoated silicon substrate using low temperature all-solution process. The RS memory devices of Ag/polymethylmethacrylate (PMMA)/ CsPbI 3 /Pt/Ti/SiO 2 /Si structure exhibit reproducible and reliable bipolar switching characteristics with an ultralow operating voltage (< +0.2 V), high on/off ratio (> 106), reversible RS by pulse voltage operation (pulse duration < 1 ms), and multilevel data storage. The mechanical flexibility of the CsPbI 3 perovskite RS memory device on a flexible substrate is also successfully confirmed. With analyzing the influence of phase transition in CsPbI 3 on RS characteristics, a mechanism involving conducting filaments formed by metal cation migration is proposed to explain the RS behavior of the memory device. This study will contribute to the understanding of the intrinsic characteristics of IHPs for low-voltage resistive switching and demonstrate the huge potential of them for use in low-power consumption nonvolatile memory devices on next-generation computing systems. S12-5 Memcapacitor-based Nonvolatile Memory and Artificial Synaptic Devices 멤커패시터기반비휘발성메모리와시냅스소자윤태식 *. 명지대학교 The metal-oxide-semiconductor (MOS) memcapacitors with a history-dependent memorized capacitance were investigated for the application to nonvolatile memory and artificial synaptic devices for neuromorphic system. The capacitance change in the MOS memcapacitor that can be used as a gate stack of MOSFET (MOS fieldeffect-transistor) or thin-film transistor (TFT) would alter the drain current that is proportional to the gate insulator capacitance. In this presentation, the memcapacitance characteristics in the Si-based MOS memcapacitor with the structure of ITO/HfOx(or CeOx)/p-Si for the MOSFET and the oxide semiconductor-based Pt/HfOx/IGZO memcapacitor for the TFT will be discussed. In particular, the analog modulation of channel conductance emulated the biological synaptic motions including potentiation, depression, excitatory postsynaptic current, paired-pulse facilitation, short-term and long-term memory characteristics that could be controlled by the input condition. These results are indicative of the potential of MOS memcapacitor for the nonvolatile memory and artificial synaptic devices, which will be discussed in detail. S12-6 Cognate Stateful Memristor Logic Gates 동계의스테이트풀멤리스터로직게이트김경민 *. 한국과학기술원 The conditional switching of memristors to execute stateful implication logic is an example of in-memory computation with the potential to provide high energy efficiency by avoiding the von Neumann bottleneck. Since the first demonstration, a significant research goal has been to improve the logic cascading of this approach to make it more practical. Here, we describe and experimentally demonstrate several Boolean logic operations by controlling conventional Ta/TaO x /Pt memristors integrated in a crossbar with applied voltage pulses. We introduce a set of four cognate stateful two-memristor logic gates along with the copy and negation operations that enable two-input-one-output complete logic. In addition, five stateful three-memristor gates are revealed that eliminate the need for a separate data copy operation, decreasing the number of steps required for a particular task. The diversity of gates available by simply applying coordinated sequences of voltages to a memristor crossbar significantly improves stateful logic computing efficiency. S13-1 Block Copolymer-templated Hollow n-zno/p-si nanodiode Arrays using Atomic Layer Deposition 블락공중합체와원자층증착법을이용한 n-zno/p-si 나노다이오드어레이제조권세훈 *. 부산대학교 One-dimensional (1-D) nanostructures have attracted much attention for nanoscale electronics, photonics including electron transport channel, electrode in sensors, photocatalyst. Owing to the high surface-to-volume ratios and structural uniqueness, the 1-D nanostructures can present excellent electron transport efficiency and the significantly reduced electron-hole recombination. However, most of the 1-D arrays were just the single-component-nanostructuresor the multi-components-core shells with the limitation of bundling and collapse. It have been rarely reported the n-zno/p-si heterostructured nanotube by other studies. We present a novel and simple methodology to obtain 1-D n-zno/ p-si nanotube arrays by using combined techniques of block copolymer (BCP) self-assembly, atomic layer deposition (ALD), and inductive coupled plasma dry etching. Free-standing heterostructured n-zno/p-si NTs without collapse and bundle fabricated. The resulting nano-diode showed a typical rectifying behavior of diode. This simple and useful approach provides a very convenient route to fabricate high-density nanodiode patterns without using high-cost photolithography. S13-2 Application of ALD to the 2D Materials and Devices 원자층증착법의이차원반도체소재및소자연구응용안지훈 *. 한국해양대학교 68 한국세라믹학회

79 구두발표 Part 1. A reliable and rapid manufacturing process of MoS 2 with atomic-scale thicknesses remains a fundamental challenge toward its successful incorporation into high-performance nanoelectronics. In the part 1 of this presentation, inhibitor-utilizing ALD will be presented as a novel method to deposit high-quality MoS 2 films at the wafer scale. Part 2. Electric-double-layer transistors (EDLTs) can be applied to practical devices with flexibility and transparency as well as research on the fundamental physical properties of 2D materials. However, they suffer from inherent unwanted leakage current between electrodes. Therefore, a simple method to improve the leakage current properties of EDLTs will be presented via a hybrid gate dielectrics of ion gel with ultra-thin ALD passivation layer based on 2D semiconductor channels. S13-3 Energy-efficient and Reliable Multi-bit Resistive Switching in Al 2 O 3 /Ta 2 O 5 Stacked Based Device Jin Joo Ryu, Gun Hwan Kim *. Korea Research Institute of Chemical Technology The controllability and reliability of multi-bit operation in Ta 2 O 5 based resistive switching (RS) device was demonstrated via 100 nslong electric pulse based incremental step pulse programing (ISPP) and error check and correction (ECC) method. In spite of severe stochastic nature of RS device, highly controllable reliability of multibit operation was achieved which has never been accomplished by varying the current compliance or simple voltage controlling method. The one important aspect in this research is that the resistance-state overlap probability between neighbored resistance-states could be controlled within one s intention. The other is the number of ECC during multi-bit operation could be minimized by the stacked Al 2 O 3 layer. For the reliable performance of multi-bit RS operation, some kind of prerequisites are required. In this presentation, the overall experimental procedure will be provided which includes device fabrication, RS mechanism, prerequisites of device characteristic, application of ISPP / ECC method and its temperature dependency. S13-4 Atomic Layer Deposition : A Few Prospective Applications Aiming Mass-production after Surrent Si-based Semicondictor Process 원자층증착법 : Si 기반공정이후의양산지향형응용박태주 *. 한양대학교 ALD is one of the most advanced thin film coating or deposition technique in the current vacuum science or electronic device fabrication processes. Recently, the matured ALD technique begins to look for new applications with its strong advantages such as the superior step coverage on complicated 3D structures and extremelyprecise film thickness controllability. Up to now, there have been a few feasible applications of ALD technique aiming at mass production; electrical and chemical passivation of the assorted solar cells and organic/inorganic flat panel displays, of which fabrication process and physics are familiar with those of semiconductor devices. This presentation starts with the introduction of modified/advanced ALD process for current Si based industry; D FM and EA-ALD technique for efficient metal film growth to achieve ultrathin and continuous thin film. Next, post-cmos technology and ALD applications for energy system such as PECs are also discussed. Another important application of ALD technique could be the design of core-shell structured nano/micro particles for multifunctional applications. A specially designed ALD reactor enables the successful fabrication of core-shell structured nano/micro particles irrespective of the chemical reaction conditions (ph, temperature etc). This technique is also applicable to passivation of various quantum dots and microparts. S13-5 Atomic Layer Deposition of Layered SnS x 층상구조주석황화물박막의원자층증착법김성근 *. 한국과학기술연구원최근이차원전이금속칼코지나이드 (2-dimensional transition metal chalcogenides, TMCs) 소재가우수한전기적 광학적물성으로많은관심을받고있다. TMCs 소재에대한연구는초기의 TMCs 소재고유물성에대한탐색에서, 최근에는실제 TMCs 소재의산업화에필수적인대면적박막합성에대한연구가많이이루어지고있다. 대표적인 TMCs 소재인 MoS 2, WSe 2, WS 2 등등은 vapor transport method, chemical vapor deposition 등등의방법을통해웨이퍼스케일에서의균일한박막형성등이최근보고되었다. 그러나, 이러한박막형성을위해서는 도이상의고온공정이필수적으로요구되며, 이러한고온공정은전자소자형성에적합하지않은문제를가지고있다. 본연구에서는기존의전자소자공정에적합한 TMCs 소재및박막공정을개발하고자하였으며, 특히낮은녹는점을가져공정온도감소가가능한주석황화물계박막에주목하였다. 특히주석황화물박막은주석의산화가수에따라 p형 (SnS) 및 n형 (SnS 2 ) 반도성을선택적으로제어할수있는소재이다. 본연구에서는대면적증착및균일한박막증착에장점이있으며, 이미전자소자공정에널리활용되고있는원자층증착법을이용하여이차원구조의 n형 SnS 2 및 p형 SnS 박막을선택적으로형성하는기술을개발하였다. SnS 및 SnS 2 박막모두기존전자소자제작에적합한 400도이하의공정온도에서층상구조를유지하며균일하게형성되었다. S13-6 Surface Energy Tuning by Atomic Layer Deposition for Hydrophobic Coating Han-Bo-Ram Lee *. Incheon National University Hydrophobic coating is one of practically important surface property engineering methods for many applications, such as non-stick coating of kitchen wares and water-proof coating of electronic gadgets. Polymers that have been widely used for hydrophobic coating materials due to their simple coating process and low fabrication cost, however, they have several inherent disadvantages, such as thermal instability and low mechanical durability. Recently, rear earth oxides (REOs) have been proposed for stable and robust hydrophobic materials. In this work, we utilized atomic layer deposition (ALD) for hydrophobic coating using REOs. Five ALD REOs were developed by using new rare earth element precursors, and surface energy changes of REOs were investigated by using various approaches. Surface energy of the ALD REOs could be precisely controlled by adjusting film thickness. Liquid tweezers and oil-water filtration were demonstrated by tuning surface energy of REO. 한국세라믹학회 69

80 2018 년한국세라믹학회춘계연구발표회 G2-1 The Study on Photocatalytic Activities with z-scheme Mechanism as Fe 2 O 3 nanorods of High Asepct Ratio Coated with g-c 3 N 4 by Thermal Evaporation Method 높은종횡비를갖는 Fe 2 O 3 나노로드와열증기법으로코팅된 g-c 3 N 4 의 z-scheme 헤테로구조메커니즘과광촉매응용분야에대한연구강수희 *, 장준영, 이선영. 한양대학교광촉매재료를이용한오염물질분해, 수소생산또는물분해는재생가능한에너지를태양으로부터직접적으로얻을수있기때문에, 지속적인연구가이루어지고있다. 광촉매의광반응성향상을위해광전극필름제조가필요한데, 이는산이나알카리전해질에서높은안정성, 뛰어난빛흡수도, 전하이동특성및낮은재결합률을필요로한다. 그중, hematite (Fe 2 O 3 ) 는가시광선에반응을하는물질로태양광에너지의최대 40% 까지흡수를할수있고, 1.9~2.2 ev의밴드갭을지니기때문에광촉매재료로각광받고있다. 또한, 화학적반응성과안정성이뛰어나며, 낮은비용으로제작이가능하고지구상에풍부하게존재하는물질중하나이다. 그러나, 높은재결합률, 낮은전도도로인해낮은광반응성이나타나는문제점이있다. 이러한문제점을최소화시키기위해, 2.6 ev의가시광밴드갭을지니는비금속유기반도체인 g-c 3 N 4 를 Fe 2 O 3 와 Z-scheme 메커니즘을따르는헤테로구조로제작하고자한다. 본연구에서는열증기법소결공정을통해 graphitic carbon nitride (g-c 3 N 4 ) 을 Fe 2 O 3 나노로드위에코팅하고자한다. 높은종횡비를갖는 Fe 2 O 3 나노로드는 Fluorine-doped tin oxide 기판위에용매열방법으로합성시킨다. 후에, melamine 전구체를이용하여 g-c 3 N 4 을직접적으로코팅한다. 샘플들은 g-c 3 N 4 전구체양에따라비율을조절하였다. 헤테로구조를지니는 Fe 2 O 3 /g-c 3 N 4 필름은 bare Fe 2 O 3 보다높은광반응성능을보였음을확인하였다. 또한가시광선아래서 4-nitrophenol 유기오염물질에서뛰어난광분해능이나타남을확인하였고, 수소가생산됨을확인할수있었다. Fe 2 O 3 /g- C 3 N 4 필름은태양광을이용한응용분야나, 전기촉매에다양하게응용될수있을것이다. G2-2 Strength Improvement of Extruded Type Zeolite Honeycomb for VOCs Adsorption Rotor VOCs 흡착로터용압출형제올라이트허니컴의강도향상연구최광일 *, 김명중, 이성진. ( 주 ) 아이비머티리얼즈산업화가고도화될수록산업분야전반에걸쳐다양한화학성분들을사용하고있으며, 이에항온항습과더불어배출된공기에대한처리를위해다양한소재와정화장치들이사용되고있다. 그중에서도제올라이트는흡착성능이매우우수하여고효율 저에너지화기술을추구하는대기오염방지기술트랜드에가장부합하는소재로각광받고있다. 이제올라이트는큰비표면적과수μm이하의세공들이규칙적인배열을가지고있어공기중의물질을흡착할수있는능력이매우우수하다. 이러한미세기공특성으로응용분야가광범위하지만소성후강도가매우약하여형상을유지하는데어려움이있어현재는세라믹담체에제올라이트를코팅하거나 Powder, Ball, Bead, Pellet 형태등으로제작하여사용하는데국한되고있다. 하지만, 코팅방식은표면반응이커가스를제거할수있는단위면적이적어규모가큰반도체시설, 화학플랜트등산업시설에적용하기에는매우많은양의필터를필요로하게되어경제성이떨어진다. 이러한문제들을해결하기위해반응면적을넓히는방법으로제올라이트를허니컴형태로제작하는연구들이진행되고있는 데제올라이트의흡착특성으로인해건조및소성공정에서크랙발생및강도문제로허니컴제작에많은어려움이있는상황이다. 본연구에서는당사의자동차용매연저감필터 (SiC 허니컴 ) 압출기술을활용하여압출형제올라이트허니컴의강도를향상시키고자하였다. G2-3 Structural and Residual Stress Analysis of Dual-phase GDC LSCF Composites GDC-LSCF 복합소재의소결에따른잔류응력연구 Kati 1*, 김세영 1, 김수현 1, 성영훈 1, 이슬희 2, 최재형 1. 1 한국에너지기술연구원, 2 연세대학교 Dual-phase Ce 0.9 Gd 0.1 O 2 δ -La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 δ (GDC-LSCF) composites are promising candidate materials for oxygen transport membrane applications. The phase purity and crystal structure of the GDC-LSCF composites were refined from X-ray diffraction (XRD) data performed at room temperature by employing the Rietveld analysis method. Rietveld analysis indicated that the structures of GDC and LSCF phases are well crystallized in cubic Fm3m and rhombohedral R3c space groups, respectively. When the composites are cooled from their sintering temperature, compressive stresses are generated in the GDC and corresponding tensile stresses are generated in the LSCF due to their differences in thermal expansion coefficients. The compressive residual stresses of the composites are investigated by high-angle XRD measurements using the well-known sin 2 ψ method. Crystal structures and residual stresses in GDC-LSCF composites are studied thoroughly in the present work by XRD. G2-4 Study of Surface Nanoparticle Formation by Selective Phase Transition in Sr 0.98 Ti 0.95 Me 0.05 O 3-δ (Me=Mn, Fe, Co, Ni, and Cu) Thin-films 3d 전이금속이도핑된 Sr 0.98 TiO 3-δ 박막구조체에서선택적상변화를통한표면나노입자생성에관한연구김준규 *, 구본재, 정우철. 한국과학기술원 The in-situ growth of nanoparticles directly from an oxide support to its surface upon the annealing at reducing atmosphere known as exsolution, has been reported by many researchers in the field of hightemperature catalysis and renewable energy. Compare to conventional nanoparticle deposition technics, this process is faster and displays finer and better particle distribution. From an engineering standpoint, it is necessary to control the characteristics of nanoparticles such as size, distribution, and type. However, the governing factors and specific methods to manage them remain unknown. Here, we prepared dense thin-films of 3d-transition metal (Mn, Fe, Co, Ni and Cu) doped Sr 0.98 TiO 3-δ and observed the ex-solved nanoparticles depending on temperature, po 2, and kind of dopant via SEM. The ex-solved nanoparticles decrease in size and increase number density as increasing temperature or decreasing po 2. Additionally, the ex-solution trend was investigated, which exsolution easily occurs with small thermodynamic driving force in order of Cu, Ni, Co, Fe and Mn. Consequently, we succeeded in explaining these observations with nucleation kinetics and dopant segregation thermodynamics in the absence of coarsening and proposing techniques that can control exsolution particles extensively. 70 한국세라믹학회

81 구두발표 G2-5 High-performance Piezoelectric Nanogenerators Based on Polymer-Ceramic Composite 폴리머와세라믹복합소재를기반으로하는고성능압전소자이은정 1*, 김태윤 2, 김상우 2, 정선호 1, 최영민 1, 이수연 1. 1 한국화학연구원, 2 성균관대학교 Piezoelectric nanogenerators (PNGs) are emerging as promising energy harvesters for scavenging mechanical energy and converting it into electrical energy. Among them, piezoelectric polymer-ceramic composite materials are promising candidate for small biomechanical energy resources to provide power sources for portable and personal electronics because of their inherent capability of combining the favorable properties of both ceramic and polymer materials. In this work, we report high-performance flexible piezoelectric nanogenerators (PNGs) based on a composite thin film, comprising of aminefunctionalized PZT nanoparticles (NPs) and a thermoplastic triblock copolymer grafted with maleic anhydride. The chemically reinforced composites achieves the formation of a highly well-dispersed PZT NPs within polymer matrix as well as the enhancement of the stress applied to PZT NPs. Without an additional dispersion enhancer, our amine-functionalized PZT NP-based flexible PNG exhibit a high output voltage of 60 V and current of 1.6 μa without time-dependent degradation, which are high enough to operate a commercial light emitting diodes (LEDs). Our proposed approach is an unprecedented improvement in the composite-based PNG research for self-powered flexible energy source to realize the wearable electronics and sensors in ubiquitous wireless communication. G2-6 Surface Modification of Ceramic Membranes for the Application of Water Treatment 수처리용세라믹분리막의표면개질기술개발이종만 *, 하장훈, 송인혁. 재료연구소 The pristine alumina membranes are usually susceptible to membrane fouling during water purification process. It is attributed mostly to the positively charged surface properties, which resulted from relatively high isoelectric point (IEP) of 9.4. For improving the fouling resistance of alumina membranes, we endeavored to control the surface properties using two different methods: organic and inorganic surface modifications. For the organic modification, three representative organosilanes presenting neutral (-CH 3 ), positive (-NH 2 ), and negative (-SO 3 ) charges were allowed to graft onto alumina membranes. In the membrane filtration test using humic acid, the neutral and negatively charged membranes maintained higher flux patterns. Notably, the negatively charged membranes achieved the most remarkable flux behavior during entire fouling procedure. This result is primarily ascribed to the electrostatic repulsion force between the organosilanegrafted membranes and negatively charged humic acid (IEP: 4.7). For the inorganic modification, the alumina membranes were modified using a SiO 2 sol-gel process to mitigate membrane fouling. Due to low isoelectric points, SiO 2 -coated membranes have a strong negative surface charge ( 130 mv at ph 6.5), which results in the electrostatic repulsion forces against humic acid. The membranes with higher TEOS concentrations exhibited higher flux levels during membrane fouling procedures. Thus, the respective surface modifications with organosilane and amorphous SiO 2 could successfully produce the negatively charged membranes. These surface-modified membranes would prevent the serious humic acid adsorption via electrostatic repulsion and enhance the fouling resistance of alumina membranes. G2-7 Exceptionally Eenhanced Electrode Activity of (Pr,Ce)O 2-δbased Cathodes for Thin-film Solid Oxide Fuel Cells 박막고체산화물연료전지용 (Pr,Ce)O 2-δ 기반공기극의향상된전극활성서한길 *, 최윤석, 정우철. 한국과학기술원 We show that an electrochemically-driven oxide overcoating substantially improves the performance of metal electrodes in hightemperature electrochemical applications. As a case study, we overcoate Pt thin films with (Pr,Ce)O 2-d (PCO) by means of cathodic electrochemical deposition process that produced nanostructured oxide layers with a high specific surface area and uniform metal coverage and then examine the coated films as an O 2 -electrode for thin-film-based solid oxide fuel cells. The resulting structures were examined by SEM, XRD and ICP-MS. The electrode activity of symmetric cells (cathode electrolyte cathode) was analyzed by the AC impedance spectroscopy (ACIS) measurements. The combination of excellent conductivity, reactivity and durability of PCO dramatically improves the oxygen reduction reaction rate while maintaining the nanoscale architecture of PCO layers and thus the performance of the PCO-coated Pt thin-film electrodes at high temperatures. As a result, with an oxide coating step lasting only five minutes, we successfully reduced the electrode resistance by more than 1000 times at 500 o C in air. These observations provide a new direction for the design of highperformance electrodes for high-temperature electrochemical cells. G2-8 Electrochemical Performance of Amorphous Carbon Coated α-fe 2 O 3 /expanded Graphite Composite as Anode Active Materials for Lithium Ion Batteries 리튬이온전지용비정질탄소코팅 α-fe 2 O 3 / 팽창흑연복합체음극활물질의전기화학적성능평가박윤태 *, 이기태. 전북대학교 Natural graphite (NG) has been attracted as a promising anode material for lithium ion batteries due to its appropriate charge/ discharge profile, high reversible capacity, and low cost. Despite its low-cost advantage, the material cost should be reduced further in order to be used for electric vehicles and energy storage systems. Hematite (α-fe 2 O 3 ) is thermodynamically stable under ambient conditions and shows significantly high theoretical capacity (1007 mah/g) as an anode material for lithium ion batteries. Hematite is capable of insertion/de-insertion more than 6 Li + per formula unit leading to a significantly larger reversible capacity than graphite. However, the hematite suffers from critical capacity degradation and deprived rate capability due to the volume change. In the present work, two effective strategies have been used to restrain these issues: (1) Hematite nanoparticles were mostly located in the interspace of the expanded graphite (EG) layer. (2) Hematite and EG composite (EG-Fe) powders were coated with amorphous carbon. The EG powder shows better reversible capacity and cycle retention than spherical natural graphite. Moreover, the EG-Fe 한국세라믹학회 71

82 2018 년한국세라믹학회춘계연구발표회 powder exhibited much higher reversible capacity than the EG powder. However, the cyclability and the first cycle retention of the EG-Fe powders were poorer than the EG powder. Consequently, the electrochemical performance of the EG-Fe powder improved significantly after coating amorphous carbon. G2-9 High Performance Triboelectric Nanogenerators using Composite of Ferroelectric and High Dielectric Materials 강유전및고유전율복합재료를이용한고출력마찰전기발전연구정재환 *, 승완철, 윤홍준. 성균관대학교 Low output current represents a critical challenge that has interrupted the use of triboelectric nanogenerators (TNGs) in a wide range of applications as sustainable power sources. Many approaches (e.g., operation at high frequency, parallel stacks of individual devices, and hybridization with other energy harvesters) remain limited in solving the challenge of low output current from TNGs. Here, a nanocomposite material system having a superior surface charge density as a triboelectric active material is reported. The nanocomposite material consists of a high dielectric ceramic material, barium titanate, showing great charge-trapping capability, together with a ferroelectric copolymer matrix, Poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)), with electrically manipulated polarization with strong triboelectric charge transfer characteristics. Based on a contact potential difference study showing that poled P(VDF-TrFE) has 18 times higher charge attracting properties, a fraction between two components is optimized. Boosting power-generating performance is achieved for 1130 V of output voltage and 1.5 ma of output current with this ferroelectric composite-based TNG, under 6 kgf of pushing force at 5 Hz. An enormously faster charging property than traditional polymer film-based TNGs is demonstrated in this study. Finally, the charging of a self-powering smartwatch with a charging management circuit system with no external power sources is demonstrated successfully. G2-10 Characterization of MgMnO 3-δ as Oxygen Carrier Material for Chemical Looping Combustion 매체순환연소용 MgMnO 3-δ 산소전달물질의특성연구황종하 1*, 이기태 2. 1 ( 주 ) 코씰, 2 전북대학교 CO 2 has been designated to have the highest contribution for global warming due to a large amount of emissions. Chemical looping combustion (CLC) is attracting attention as a promising technology for carbon capture and storage (CCS). Since CLC does not require a CO 2 separation device, it is more efficient than the conventional integrated gasification combined cycle (IGCC). In a chemical looping combustor, the oxygen carrier is an important material for supplying oxygen required for the reaction and transferring heat. In this study, MgMnO 3-δ, which has a defect cubic spinel structure rather than a perovskite structure, is proposed as an oxygen carrier material. MgMnO 3-δ can be synthesized easily from inexpensive precursors such as MgO and Mn 2 O 3. Since MgO and MnO easily form a complete solid solution, a single-phase redox reaction from (Mg,Mn)O to MgMnO 3-δ accompanied by a relatively high oxygen transfer capacity can occur reversibly unlike MgMn 2 O 4 or MnMg 2 O 4 with normal spinel structure. From this perspective, the phase analysis, redox mechanism, stability, and oxygen transfer properties of MgMnO 3-δ as a cost-effective oxygen carrier material for CLC were systemically investigated in this study. S21-1 Enhancing Long-Term Stability of Stabilized Bismuth Oxides via Physicochemical Manipulation 물리화학적조작을통한안정화비스무스산화물의장기안정성개선연구 Byung-Hyun Yun 1*, SeungJin Jung 2, Incheol Jung 1, Chan-Woo Lee 3, WooChul Jung 2, and Kang Taek Lee 1. 1 DGIST, 2 KAIST, 3 KIER At 600 o C, the Er 2 O 3 -stabilized Bi 2 O 3 (ESB) exhibits a superior oxygen ion conductivity (~0.14 S cm 1 ). However, there is significant conductivity decay due to a cubic-to-rhombohedral phase transformation over time. Thus, to enhance the kinetic stability of ESB, we developed a novel double-doped bismuth oxide through additional quadrivalent doping in ESB. Surprisingly, 1 mol.% of Hf-doped ESB showed no conductivity degradation without a phase transition for 1200 h at 600 C, while the conductivity of pure ESB drops to significantly ( 5% of initial σ) within 200 h. When the diffusion coefficient of Bi 3+ in the cation sublattice of ESB was measured using the Boltzmann-Matano method, Hf doping greatly reduced the diffusion coefficient by ~53% compared to pure ESB. This result suggests that the control of the cation interdiffusion coefficient is the key to suppression of phase transformation kinetics of the stabilized bismuth oxide, thus enhancing the long-term stability of its conductivity. Because cation diffusion coefficient can be controlled by microstructure as well, we further investigated the effect of grain boundary on long-term stability with epitaxial (single crystalline) and columnar (polycrystalline) ESB thin film samples. In this presentation we will report our recent progress on enhancing stability of the stabilized bismuth oxides via physicochemical manipulation. S21-2 Study on Thin-film Electrolyte Development for Anodesupported SOFC Operating at Intermediate-low Temperature 연료극지지형고체산화물연료전지의중저온작동을위한박막전해질공정에관한연구강성민 1*, 김유성 2, 배중면 1. 1 KAIST, 2 서울대학교보다낮은온도에서의작동에관한연구는최근 10여년간고체산화물연료전지 (SOFC) 분야에서가장관심받는연구분야중하나이다. SOFC의작동온도를낮추기위한방법은크게 2가지로나뉘는데, 첫번째로는보다낮은온도에서도충분한수준의이온전도도를갖는전해질소재를개발하는것이다. La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-δ (LSGM), Bismuth oxides 계열전해질혹은몇몇수소이온전도성전해질이대표적인물질들이나, 전극과의화학적안정성혹은전극계면의촉매활성도등의문제로이를활용한중저온 SOFC는상용화단계에이르지못하고있다. 두번째방법은전해질의두께를비약적으로얇게제작하여이온전도길이를극한으로줄이는것이다. 중저온에서전해질의이온전도도는 exponential하게감소하지만, sub-micron 스케일의전해질은낮은온도에서도이온전도저항을충분히낮은수준으로유지할수있기때문에박막전해질을이용한 SOFC는중저온작동이가능하다. 본연구에서는대면적화가능한공정인 Sputtering과 Sol-Gel coating을이용하여박막전해질을제작하고, 이를연료극지지형 SOFC의플랫폼에적용하여단전지를제작하였다. 단전지의전기화학적성능을측정및분석하였고, morphology를분석하여박막제작공정에따른특성을비교하였다. 72 한국세라믹학회

83 구두발표 S21-3 A Study on Redox Reaction Kinetics of Ni-YSZ Anode for Solid Oxide Fuel Cells 고체산화물연료전지용 Ni-YSZ 연료극소재의레독스반응속도에관한연구박재우 *, 박윤태, 이기태. 전북대학교 Solid oxide fuel cells (SOFCs) operating at high temperatures have the disadvantage of poor durability. So many researchers are studying on lowering the operating temperature. An anode-supported cell (ASC) was designed for low operating temperatures and high performance. Nickel-yttria stabilized zirconia (Ni-YSZ) cermet has been used as an anode material for SOFCs for more than 20 years. Although Ni-YSZ has various advantages such as high catalytic activity and high electrical conductivity, it has the problem of redox instability. Redox cycles can be caused by system startup and shutdown, sudden interruption of fuel supply and sealing problems such as leaks. In the oxidation process, the phase change from Ni to NiO is accompanied by a volume expansion of 69% resulting in internal cracks and consequent destruction of the cell. In this study, the redox reaction kinetics of Ni-YSZ cermet according to various temperature conditions has been studied. The conversion ratio of Ni-YSZ was obtained based on thermo-gravimetric analysis (TGA). To investigate both oxidation and reduction reaction mechanisms, the Johnson-Mehl-Avrami (JMA) kinetics model was applied and the relationship between reaction time and conversion ratio was obtained by curve fitting simulation. S21-4 Improved Performance of Metal-decorated SOFC Anode via Atomic Layer Deposition 원자층증착기법을통한금속나노입자안정화및 SOFC 연료극성능향상서종수 1*, Nikolai 1, 김정환 2, 지상훈 3, 정우철 1. 1 KAIST, 2 재료연구소, 3 한국건설기술연구원 Highly active metal nanoparticles (NPs) are desired to serve for hightemperature electrocatalysis, such as solid oxide fuel cells (SOFCs). However, the insufficient thermal and chemical stability of metal NPs are a grand challenge in ensuring the durability of metal-decorated electrodes. It is thus necessary to effectively suppress the sintering of the metal NPs distributed on the electrode surface at high operating temperatures (> 500ºC). Here, we address this issue with oxide surface treatment via atomic layer deposition (ALD). Porous La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 (LSCM) electrodes are fabricated by screen print, and then Pt NPs are impregnated on the surface of electrodes. To improve the thermal and chemical stability of NPs, thin layers of HfO 2 and Al 2 O 3 are uniformly coated on the Pt-decorated electrodes via ALD. We observe that the ALD-treated electrodes with Pt NPs remarkably improve both electrochemical activity and long-term (50 h) stability at 650ºC, as evidenced by AC impedance analysis. The implications for the use of ALD for the development of high-performance electrodes will be discussed. S21-5 Proton Conducting Electrolyte with Improved Proton Conductivity and Chemical Stability 수소이온전도도및화학안정성이향상된고체산화물연료전지전해질용수소이온전도체 김혜성 *, 배형빈, 정성윤. KAIST In many ion-conducting polycrystalline oxides, grain boundaries are generally accepted as rate-limiting obstacles to rapid ionic diffusion, often resulting in overall sluggish transport. Consequently, based on a precise understanding of the structural and compositional features at grain boundaries, systematic control of the polycrystalline microstructure is a key factor to achieve better ionic conduction performance. In this study, we clarify that a nanometer-thick amorphous phase at most grain boundaries in proton-conducting BaCeO 3 polycrystals is responsible for substantial retardation of proton migration and moreover is very reactive with water and carbon dioxide gas. By a combination of atomic-scale chemical analysis and physical imaging, we demonstrate that highly densified BaCeO 3 polycrystals free of a grain-boundary amorphous phase can be easily fabricated by a conventional ceramic process and show sufficiently high proton conductivity together with significantly improved chemical stability. These findings emphasize the value of direct identification of intergranular phases and subsequent manipulation of their distribution in ion-conducting oxide polycrystals. S21-6 High Performance from Thin Film Protonic Ceramic Fuel Cells 박막기반고성능프로톤전도성세라믹연료전지개발최형종 1*, 최현락 1, 한권덕 1, 김동환 1, 윤성원 1, 배기호 1, 이종호 2, 심준형 1. 1 고려대학교, 2 한국과학기술연구원 Thin film based electrolytes are of interest because they minimize the energy loss due to ion conduction and can lower the operating temperature of ceramic fuel cells. Protonic ceramics have great potential as high performance electrolytes due to their low activation energy for proton conduction with high mobility. However, the poor sinterability and mechanical instability of the protonic ceramics hinders its application to thin film electrolytes. Though there have been some advances in the fabrication of thin film protonic ceramics using physical vapor deposition, the development of non-vacuum and cost effective thin film processes is still required for the production of thin film protonic ceramic electrolytes. In this study, we propose a slurry spin coating method as a tool for fabricating thin film for high performance protonic ceramic fuel cell (PCFC). By precisely controlling the spin coating conditions, the thickness of PCFC electrolyte (BZCYYb) was successfully minimized. The I-V and EIS results show that the thin film PCFC exhibits improved power density due to reduced ohmic losses. In addition to the detailed fabrication process of thin film PCFCs using slurry spin coating, strategies for improving the electrochemical performance of thin film PCFCs including the introduction of a cathode functional layer will be presented in this session. S21-7 Hybrid-solid Oxide Electrolysis Cell: Highly Efficient Hydrogen Production Using Mixed-ion (H + /O 2 ) Conducting Oxide 하이브리드고체산화물전해셀 : 혼합이온전도성전해질을사용한고효율수소생산김준영 *, 김건태. UNIST Recently, the hydrogen has been focused as a next generation energy carrier because it is a versatile, clean, efficient fuel, and the most abundant element in the universe. High purity hydrogen, however, has 한국세라믹학회 73

84 2018 년한국세라믹학회춘계연구발표회 been produced by various hydrocarbon through an expensive external reformation, inducing high pollutant emissions. In this regard, solid oxide electrolysis (SOEC) has been considered as the alternatives, being able to be cost-effective, environmentally friendly, and highly efficient for the hydrogen production. SOEC was classified into oxygen ion conducting SOEC and proton conducting SOEC according to the electrolyte material. Herein, the novel concept of SOEC based on a mixed-ion conductor is introduced with the excellent electrochemical performance for the effective hydrogen production by expanding the water electrolysis active site. S22-1 NiO-based Inorganic Hole-extraction Layers for Perovskite Solar Cells 김진영 *. 서울대학교 Perovskite solar cells based on the organometal halides (e.g. methylammonium lead iodide; MAPbI 3 ) have been investigated very intensively owing to their skyrocketing conversion efficiencies. The perovskite solar cells can be classified either as a n-i-p type or as a p- i-n type depending on the direction of charge collection. Among them, the p-i-n type devices especially with a planar structure have advantages such as simple and low-temperature processes compatible with flexible substrates, negligible hysteresis effect, and potential tandem configuration with other highly efficient inorganic solar cells. However, the p-i-n type planar devices have issues of lower conversion efficiency compared with the n-i-p type counterparts and poor stability resulting from the use of organic hole-extraction layers. In this study, we successfully demonstrate highly efficient p-i-n type planar perovskite solar cells with inorganic NiO-based hole-extraction layer. Factors that govern the solar cell performance of the NiO-based perovskite solar cells have been investigated systematically, especially regarding their influences on the fill factor. It has been found that the conductivity of the hole-extraction layer and its physical/electrical contact with the perovskite layer are very important for the device performance. It has been also found that the long-term stability of the perovskite solar cells has been significantly enhanced by replacing the conventional organic PEDOT:PSS layer with the inorganic holeextraction layer. As a result, the best NiO-based device exhibits a high conversion efficiency of ~ 20% with no hysteresis effect, which is the best efficiency among the p-i-n type planar devices. S22-2 Oxide-Halide Heterojunction for Perovskite Solar Cells 노준홍 1,2*. 1 고려대학교, 2 한국화학연구원 Inorganic-organic hybrid halide materials such as methylammonium lead iodide (MAPbI 3 ) or formamidinium lead iodide (FAPbI 3 ) have attracted many attentions in recent as an innovative photovoltaic semiconductor for the future photovoltaic systems which require lowcost fabrication process and high power conversion efficiency (PCE). The perovskite solar cells (PSCs) basically consist of two heterojunctions such as n-type semiconductor/hybrid halide perovskite and the halide/ p-type semiconductor. In the heterojunctions, the n/p-type layers contacted with the perovskite layer play key roles in photovoltaic performance for PSCs with regard to electron/hole transporting and hole/electron blocking between perovskite and conducting anode/ cathode as well as light passing from transparent electrode into perovskite layer. In addition, the n/p-type materials strongly influence the photo, thermal, and chemical stability of PSCs. In this point of view, it is notable that oxide semiconductors with wide band gap such as TiO 2, SnO 2, NiO have been used the n/p-type materials in PSCs. Although TiO 2 has been usually used as an n-type oxide semiconductor in oxide-halide heterojunction, alternative to TiO 2 is required for enhancement of photovoltaic performance and stability for PSCs. In this talk, design of the heterojunction between oxide and halide layers will be discussed for further improvement of PCE in HPSCs. S22-3 Low-Temperature Synthesis of Inorganic Electron Extraction Layers for Perovskite Solar Cells 고민재 *. 한양대학교 Organic-inorganic hybrid perovskite semiconductors have emerged as promising next-generation photoactive materials for solar cell applications because of their unique properties such as low energy bandgaps (~ 1.6 ev), high extinction coefficients, long exciton diffusion lengths, and low exciton binding energies. They are solution processable at low temperatures, which means that the associated solar cells can be printed on plastic substrate. Over the past few years, we have developed several facile methods for the fabrication of efficient flexible solar cells on plastic substrates. In this talk, several starategies to address these issues will be introduced. S22-4 Recent Progress and Challenges of Pb-free Perovskite: Materials to Device Structure 송명관 *. 재료연구소 Lead-containing halide perovskite solar cells have attracted much attention recently because of their high-efficiency and low-cost. Despite its superior properties, the toxicity of lead and the instability of this lead-based perovskite under ambient air could be obstacles for future commercialization. Therefore, a key scientific challenge is to replace the lead in the perovskite crystal with a less toxic and a more stable. Beyond the Sn element, bismuth is chemically similar but more environmentally friendly. Furthermore, bismuth based perovskite materials have high optical absorption, and better chemical stability under ambient atmosphere than the lead based perovskite, which are suitable for solar cell application. The Pb-free perovskite materials reported on structural and optical properties of this material, but the results on solar cell performance were so far rather poor. Here, we will present on the synthesis, optical properties and high-efficiency with Pb-free perovskite solar cells. S22-5 Operando Observation of Oxygen Migration in a n-i-p Type Organometal Halide Perovskite Solar Cell under In-Situ Electrical Biasing 전기장하에서 n-i-p 구조페로브스카이내의산소이동의 in-situ 측정신병하 *. KAIST Using in-situ electrical biasing transmission electron microscopy, we examined structural and chemical modification to p-i-n type methylammonium lead triiodide (MAPbI 3 ) solar cells with a TiO 2 electron transporting layer caused by electrical bias in the absence of other stimuli known to affect the physical integrity of MAPbI 3 such as moisture, oxygen, light, and thermal stress. Electron energy loss 74 한국세라믹학회

85 구두발표 spectroscopy measurements revealed that oxygen ions were released from the TiO 2 and migrated into the MAPbI 3 under forward bias. The injection of oxygen was accompanied by significant structural transformation; a single crystalline MAPbI 3 grain became amorphous with the appearance of PbI 2. Withdrawal of oxygen back to the TiO 2, and some restoration of the crystallinity of the MAPbI 3 was observed after the storage in dark under no bias. A subsequent application of reverse bias further removed more oxygen ions from the MAPbI 3. Light current-voltage measurements of perovskite solar cells exhibited poorer performance after elongated forward biasing; recovery of the performance, though not complete, was achieved by subsequently applying negative bias. These results indicate negative impacts on the device performance caused by the oxygen migration to the MAPbI 3 under forward bias. Our study identified a new degradation mechanism intrinsic to p-i-n MAPbI 3 devices with TiO 2. S23-1 Hierarchical Nanostructured Transition Metal Oxides for Secondary Lithium-Ion Batteries 위계성나노구조를갖는전이금속산화물기반리튬-이온이차전지서정길 *. 명지대학교 Lithium-ion batteries (LIBs) have already dominated the portable electronic market and expanding their territory into large scale electric energy storage applications such as in electric vehicles and renewables power stations. With rapidly increasing demands for improved energy storage devices, the development of LIBs with high power density and excellent cycling stability has become a critical issue. To meet these urgent demands, intensive efforts have been devoted to search for new superior electrode materials such as transition metal oxides due to its high theoretical capacity (~700 mah/g), long cycle life and high rate performances. Here we report electrochemical performance of TMO (MO/AM 2 O 4 A or M is Cu, Ni, Co, Zn or Mg) as anode material for LIBs. All the materials are synthesized by chemical route followed by annealing. Hierarchical architecture can provide numerous accessible electroactive sites for redox reactions, shorten the diffusion distance of Li-ion during reaction, and accommodate volume expansion during cycling. Furthermore, present easy and cost-effective synthesis approach can be generalized to grow other metal oxides nanostructures for high energy storage applications. S23-2 Synthesis and Electrochemical Properties of Niobium Oxide Based Cluster Microspheres as Lithium Storage Materials 니오븀산화물기반복합나노구조소재의합성및전기화학적특성김재헌 *, 김경배. 국민대학교 In recent years, electrochemical energy storage devices have attracted great attention with rapid growth of their applications such as portable electronic devices, electric vehicles, and large-scale energy storage systems. Among various devices, lithium-ion based systems such as lithium batteries and hybrid supercapacitors practically still dominate current global markets. To meet the demand for both high energy density and high power, the electrode materials should be carefully designed. In this study, we exhibit the efficient microstructure through different nanomaterial interconnection. By adopting bottom-up selfassembly process via a one-pot solvothermal method, microspheres were synthesized, where a few tens nanometer scaled Nb 2 O 5 particles were connected by incorporating Ge-GeO 2 material. Electrochemical test demonstrated that the Nb 2 O 5 -Ge/GeO 2 microsphere electrode showed a reversible specific capacity of more than 600 mah g 1, stable capacity retention up to 1000 cycles, and excellent rate performance. S23-3 Design and Synthesis of Hollow Nanocomposite Materials as an Anode for Sodium Secondary Batteries 중공나노복합구조체합성및이차전지음극소재적용조중상 *. 충북대학교최근에너지저장, 가스센서, 촉매, 바이오, 제약등의여러분야에서다양한형태및조성을갖는나노구조체가연구되고있다. 이중, 최근차세대에너지저장장치개발에대한요구와관심이증대됨에따라저가의매장량이풍부한소듐사용이전지분야의새로운화두로제시되고있지만기존리튬전지에비해큰이온직경및분자량을갖는소듐은전지로적용시여러문제점을야기한다. 소듐이온의느린확산속도로인한저출력현상및큰직경을갖는소듐이온의반복적인삽입과탈리로인한전극내생성된응력은음극활물질의붕괴및극판과의박리를야기, 결국전지수명을단축시킨다. 따라서, 충방전시전극물질의부피팽창을효과적으로완화, 또는억제시키기위해음극활물질의형태적관점에서다양한연구가진행중이다. 본연구에서는다양한합성기전의분무열분해공정및전기방사공정으로의적용을통해중공나노구조체의형태및특성을제어했으며소듐이차전지의음극활물질로적용, 전기화학적특성을분석했다. S23-4 Different Aspects of Poor Initial Coulombic Efficiency of SiO for High Energy Lithium Ion Battery 고용량음극실리콘산화물의초기비효율에대한이해강병우 *. 포항공과대학교 Recently, use of Li ion batteries has been extended to large-scale applications such as electrical vehicles and energy storage systems that require high energy density of the cell. To achieve high energy density of the cell, many efforts have gone to negative electrode materials due to a limited capacity of a cathode materials. Especially, silicon has got attention as a promising anode material because it has high capacity (Li 22 Si 5, ~4200 mah g 1 ) and a low operating voltage, ~ 0.2 V. However, Si severely suffers from the very large volumetric change during charge/discharge, ~ 300 ~ 400% leading to very poor capacity retention. To mitigate this severe problem, several strategies have been proposed. Among them, the use of silicon monoxide (SiOx, x~1) can be very promising. However, SiOx has poor initial coulombic efficiency because reactive oxides in SiOx consume large amount of lithium at 1 st discharge process. In this talk, I will discuss about the origin of poor ICE and then talk about the way to improve poor ICE by controlling its microstructure. S24-1 Exploring High Performance Thermoelectric Materials and Devices through Computational Sciences 전산과학을통한고성능열전소재및열전소자탐색류병기 *, 정재환, 이재기, 박성진, 박종호, 김현, 장정인, 이지은, 김봉서, 박수동. 한국전기연구원열전현상은열을전기로, 전기를열로직접변환가능한현상이다. 온도차를바로전기에너지로바꿀수있기때문에폐열회수등에너지고효율화기술로각광받고있다. 그러나열전소재의낮은 zt 한국세라믹학회 75

86 2018 년한국세라믹학회춘계연구발표회 와성능, 열전소자의계면전기 / 열저항등으로산업화하기에는아쉬운에너지변환효율을보이고있다. 본발표에서는열전시스템의효율을향상시키기위한열전소재와열전소자탐색 / 설계기술을한국전기연구원연구결과와함께소개하고자한다. 먼저열전소재를이해하기위한원자레벨에서의고체물리이론과제일원리접근을소개한다. 나노스케일양자전산모사기법을통한 (1) 밴드제어기술, (2) 최적전하농도와페르미레벨제어기술, (3) 다상소재에서의바이폴라수송제어기술을논할예정이다. 또한, 열전소자의성능을정확하게기술할수있는편미방방정식수치해석에기반을둔열전효율연산법을소개한다. 매크로스케일전산모사를통하여 segmented/graded (4) 소자를설계 / 분석하는기술을논할예정이다. S24-2 Design of Multiple Defect Structures in Polycrystalline (Bi,Sb) 2 Te 3 Alloys for Low Thermal Conductivity 열전도도저감을위한다결정 (Bi,Sb) 2 Te 3 소재의다중결함구조디자인김상일 *. 서울시립대학교 Many studies have showed that defect structure in (Bi,Sb) 2 Te 3 alloys can reduced lattice thermal conductivity k latt effectively, including point defects (0 dimension, 0D), dislocations (1D), grain boundaries (2D), or nano-sized inclusions (3D). However, there is little report on estimating k latt quantitatively at designed defect density or on providing comprehensive prospective of multiple defect structures in minimizing k latt of (Bi,Sb) 2 Te 3 alloys. Here, we analyzed the experimental k latt of (Bi,Sb) 2 Te 3 alloys with the aforementioned defect structures by using Debye-Callaway model, and estimated the k latt at different defect densities providing design rule for each defect structure in reducing k latt. Furthermore, the influence of multiple defect structure was evaluated based on the analysis on individual defect structure, providing comprehensive prospective in minimizing k latt based on different frequency-dependency of phonon scattering by different defects. Therefore, this work provides the optimal design of multi-defect structure for high-performance (Bi,Sb) 2 Te 3 alloys. With the suggested optimal multiple defect structure with grain boundaries, dislocations and nanoinclusions, the very low k latt of ~0.24 W/mK is anticipated, and zt as high as ~2.5 can be achievable near room temperature with a typical power factor of (Bi,Sb) 2 Te 3 alloys. S24-3 Solution-based Synthesis of 2D Heterostructured Nanoplates and their Thermoelectric Properties 용액기반 2차원의이종나노플레이트합성및이의열전특성민유호 *, 한병동, 최종진, 안철우, 김종우, 황건태, 윤운하. 재료연구소 Heterostructured 2D bismuth chalcogenides have been produced using consecutive epitaxial growth of Bi 2 Te 3 and Bi 2 Se 3, starting from Bi 2 Se 3 nanoplates and grown up to multishell Bi 2 Se 2 Te 2 Se 2 Te 3 nanoplates. The lateral dimensions and the relative core and shell widths of the heterostructure can be controlled by adjusting the molar ratios of the precursors added to the seed nanoplate solution. The core-shell nanoplates allowed homogeneous distribution of Bi 2 Se 3 nanoplates in a Bi 2 Te 3 matrix after sintering process. The maximum thermoelectric figure of merit (ZT) was found to be ~0.71 at 450 K for the bulk pellet of Bi 2 Se 2 Te 3 core-shell nanoplates with an atomic ratio of [Bi 2 Se 3 ]:[Bi 2 Te 3 ] = 1:4. The improved ZT compared from that of bulk pellet of pure Bi 2 Te 3 nanoplates is due to a simultaneous improvement in electronic and thermal transport properties. S24-4 Impurity-free, Mechanical Doping for the Reproducible Fabrication of the Reliable n-type Bi 2 Te 3 -based Thermoelectric alloys 불순물없이 n형열전소재도핑기술백승협 *. 한국과학기술연구원 Precise control of carrier density is essential to synthesize highperformance thermoelectric materials. Doping by impurities is often frustrated in n-type Bi 2 Te 3 alloys by incomplete activation, bipolar doping, the formation of secondary phases, and prevailing intrinsic point defects such as vacancies. This weakens the reproducibility of synthesis processes and reduces the long-term reliability of material s performance, hence aging. Here, we explore an impurity-free doping technique to synthesize n-type bismuth tellurium selenides, combining a cold deformation and a hot extrusion. The cold deformation enables controlling the electron density in the range of ~10 19 /cm 3 via the formation of intrinsic point defects, and the hot extrusion allows texturing the microstructure to enhance the electrical conductivity, hence a large power factor of > W-m 1 -K 2. We confirm that our process is very reproducible, and the properties of the samples are stable without aging even after thermal stresses. Using this method, we can decouple the relationship between bandgap, carrier density, and composition to improve the high-temperature thermoelectric property. Moreover, we demonstrate the fabrication of highperformance thermoelectric materials from low-graded, raw materials by modifying the degree of the mechanical deformation to reach an optimum carrier density. Our work provides a promising approach to synthesizing n-type thermoelectric materials in the reproducible and adaptable way. S24-5 Research Status of Bi-Te based Thermoelectric Nanocomposites using Carbon Nanomaterials 탄소나노소재를이용한 Bi-Te기지열전나노복합재료연구현황김경태 *. 재료연구소 In this talk, thermoelectrtic (TE) nanocomposites including carbon nanomaterials such as nanodiamond (ND) for p-type and carbon nanotube (CNT) for n-type are introduced, respectively. That is, the researchers at KIMS utilized ND particles and CNTs as nano-sized dispersion agents in order to improve zt values of bismuth telluride (Bi 2 Te 3 ) based alloys, by producing affirmative extrinsic interfaces. The pre-requisites for synthesizing sound TE nanocomposites is to homogeneously disperse ND particles and CNTs in the Bi 2 Te 3 matrix. As a solution of homogeneous mixing, composite powders whereby CNTs or NDs are well mixed are firstly synthesized at KIMS and then they are consolidated into bulk form by solid-state sintering method. Since artificially embedded-nds or CNTs result in distortion of matrix lattice, it is expected that lattice phonon scattering has been actively generated at the newly formed ND/p-(Bi,Sb) 2 Te 3 and CNT/n- Bi 2 Te 3 interface when those nanomaterials are homogenously dispersed in the TE matrix. Furthermore, the newly formed extrinsic interfaces can generate atomistic defect region such as vacancies and anti-site defects between matrix and carbonic nanomaterials. Thus, it 76 한국세라믹학회

87 구두발표 is observed that the CNT/BT interfaces mainly reduce lattice thermal conductivity (κ) and ND/p-BST interfaces make defect-clustered zones which result in low thermal conductivity (κ) without deteriorating electrical properties (S 2 σ) compared to those of CNMfree BT alloys. From the results of these, it is confirmed that the extrinsically formed interfaces caused by carbon nanomaterials play an important role to improve thermoelectric performance (zt) of the bismuth telluride based materials. S24-6 Process Parameter Dependence of Anisotropy in an n- type Cu doped Bi 2 Te 3 Thermoelectric Thin Films 제조공정변화가 Cu 첨가된 n형 Bi 2 Te 3 열전박막의이방성에미치는영향최순목 1*, 배상현 1, 김일호 2, 서원선 3, 신원호 3, 양승호 4, 노윤현 5. 1 한국기술교육대학교, 2 한국교통대학교, 3 한국세라믹기술원, 4 희성금속, 5 ( 주 ) 블루시스 N-형 Bi 2 Te 3 계열전소재물성편차의주요원인으로생각되는점결 2 2 함 (point defects, V Te, V Se ) 들을제어하기위한 Cu 첨가제의효과에대해연구가보고되고있다. Cu 첨가량변화와제조공정변화가 Bi 2 Te 3 계열전박막의미세구조이방성에미치는영향과열전특성에미치는영향에대하여연구하였다. 박막공정의경우, DC/RF sputter를이용하여 Cu와 Bi 2 Te 3 를 co-sputttering 방법으로증착하였으며, Ar 분위기에서증착온도변화및후열처리실험을실시하였다. 이후에 Bi 2 Te 3 박막에도핑된 Cu의함량조절실험과다층박막제조공정실험도병행하였다. 위의결과를 bulk 실험과비교하여박막특성과 bulk 특성의차이에대하여고찰하였다. S24-7 Rapid Solidification Process for the Fabrication of Highperformance Thermoelectric Materials 급속응고공정에의한고성능열전소재제조이규형 1*, 김성웅 2. 1 연세대학교, 2 성균관대학교열전소재의성능증대를위해서는소재가포함하고있는다양한다차원-다중결함구조를제어하는것이중요한요소이다. 본연구에서는급속응고공정을이용하여제조한 Skutterudite계및 Half- Heusler계중고온열전소재의상형성및결함구조형성거동을규명하였고, 결함구조와열전특성과의상관관계를실험적 -이론적으로고찰하였다. 또한결함구조의고온안정성을평가하여개발소재의중고온열전소재로의응용특성을확인하였다. S24-8 Effect of Sintering Conditions on the Thermoelectric Properties for n-type (Hf 0.5 Zr 0.5 ) 0.7 Ti 0.3 NiSn Sb Half-Heusler Compound 소결조건에따른 n-type (Hf 0.5 Zr 0.5 ) 0.7 Ti 0.3 NiSn Sb Half- Heusler 화합물의열전특성효과 Nguyen Van Du 1*, Nguyen Van Du 1, Jamil 1, 신원호 1, 서원선 1, 김명호 2, Soonil Lee 2. 1 한국세라믹기술원, 2 창원대학교 In this study, the half-heusler (Hf 0.5 Zr 0.5 ) 0.7 Ti 3 NiSn Sb compounds were prepared by vacuum induction melting method combined with annealing and ball-milling process. The influence of spark plasma sintering (SPS) temperature (900, 1000, 1050, and 1100 o C) and time (10 minutes, 1 h, and 2 h) at pressure of 70 MPa was investigated in the compounds. The X-ray diffraction analysis revealed the half-heusler structure and small amount of impurity phases in all samples. The calculated lattice parameter from XRD data of the samples revealed a slightly decrease with higher SPS temperature. In addition, the SPS temperature increase up to 1100 o C led to increase of density and grain size, which resulted in an increase of thermal conductivity and electrical conductivity. The electrical conductivity increased with measurement temperature showing nondegenerated semiconducting behavior with increasing carrier concentration. The Seebeck coefficients of the samples showed negative values indicating n-type semiconducting behavior, and no significant correlation with the sintering temperature and time. The power factor (PF) was evaluated from the measured data, and a significant variation of PF in SPS time and temperature dependence was obtained due to the electrical conductivity variation. With the examined conditions, the highest ZT value of at 865 K was achieved with the sample SPSed at 1050 o C for 10 minutes. S24-9 Synthesis and Thermoelectric Properties of SrTiO 3 -RGO Composites SrTiO 3 -RGO 복합체의합성및열전특성 Jamil 1*, Woo Hyun Nam 1, Nguyen Van Du 1, Gul Rahman 2, Altaf Ur Rahman 2, Kyu Hyoung Lee 3, Won-Seon Seo 1, Weon Ho Shin 1, Myong Ho Kim 4, Soonil Lee 4. 1 Korea Institute of Ceramic Engineering & Technology, 2 Quaid-i-Azam University, 3 Yonsei University, 4 Changwon National University Point defects or doping in Strontium Titanium Oxide (STO) largely determine the thermoelectric (TE) properties. So far, very limited knowledge exists on the impact of Schottkey barrier on the TE performance. Herein, we report a drastic effect of Schottkey barrier on the TE performance in undoped STO which is used as a model material in this work. It demonstrates that incorporation of Reduced Graphene Oxide (RGO) into undoped STO weakens the Schottkey barrier and results in a simultaneous increase in both carrier concentration and mobility of undoped STO. The enhanced mobility exhibits single-crystal like behavior. This increase in the carrier concentration and mobility boost the electrical conductivity and power factor of undoped STO, which is attributed to the weakening of the Schottkey barrier height, presumably due to reduction of Srvacancy concentration, and the band alignment of STO and RGO which allows the charge transfer through the interface. Furthermore, the STO/RGO interface also enhanced the phonon scattering which results in low thermal conductivity. This strategy significantly increases the ratio of σ/κ that results in an enormously enhanced ZT as compared with undoped STO. This study opens a new window to optimize the TE properties of the candidate materials. G3-1 The Effect of Content of Sintering Additive on Transparent Y 2 O 3 Ceramics 투명이트리아의소결조제첨가량의영향박영조 1*, 주린린, 김하늘, 고재웅, 김해두. 재료연구소이트리아 (Y 2 O 3 ) 는투명하게소결할경우중적외선윈도우, 신틸레이터, 레이저발진자등다양한응용이가능한세라믹이다. 이러한투명이트리아소결의요체는기공률이제로에근접하는진밀도를달성하는것인데, 가장효과적인방법은소결조제를첨가하는것이다. 대표적인소결조제는 +3가의희토류산화물과 +4가의 ZrO 2 등이알려져있다. 본연구에서는소결조제무첨가조성과비교하여 +3가의 La 2 O 3 와 +4가의 ZrO 2 를첨가한경우투광성및미세구조에미치는영양을분석하여보고하고자한다. 특히, ZrO 2 의첨가는다 한국세라믹학회 77

88 2018 년한국세라믹학회춘계연구발표회 대한효과를미치는것이이미알려져있는데, 본연구에서는 ZrO 2 의임계첨가량이 1 at.% 정도인것을투광성과강도측면에서증명한것을발표할예정이다. 또한, 대부분의응용의경우소결한이트리아의열전도도가높을수록유리한데, 이를위해서는가능한한소결조제의첨가량을저감할필요가있다. 이러한관점에서임계치인 1 at.% 이하로 ZrO 2 의첨가량을낮출수있는소결방법에대한가능성을탐색하였다. G3-2 Fabrication and Characterization of Highly Transparent Y 2 O 3 Ceramics by Hybrid Sintering: A Combination of Hot Pressing and a Subsequent HIP Treatment 하이브리드소결에의한투명이트리아제조주린린 *, 박영조, 김하늘, 고재웅, 김해두, 이재욱. 재료연구소 We succeeded in the optimization of highly transparent Y 2 O 3 ceramics with a submicrometer grain size approximately 0.6 μm by hot pressing ( C) and a subsequent HIP (1450 C) treatment using commercial Y 2 O 3 powders as starting powders and ZrO 2 as a sintering additive. The optimum microstructure for the HIP treatment was prepared by hot pressing at a temperature as low as 1400 C for 3 h with a relative density of 99.3%. The thus HIP-treated specimen showed the best transmittance (2 mm thick) ever reported of 83.4% and 78.3% at 1100 and 400 nm, respectively. Specifically, the transmittance using this hybrid sintering method improved substantially in the visible range compared to that of the counterpart using hot pressing only. A simulation of the transmittance based on the Beer- Lambert law and Mie scattering theory has proved that this improvement is mainly due to the elimination of nanopores below 15 nm in size. G3-3 Effect of Starting Powder Characteristics on Sinterability and Optical Property of Y 2 O 3 Ceramics 투명이트리아세라믹스의소결성및광학적특성에미치는출발원료분말특성의영향오현명 1*, 박영조 2, 김하늘 2, 고재웅 2, 이현권 1. 1 금오공과대학교, 2 재료연구소민수및군수분야의윈도우소재로개발되어상용화되고있는투명이트리아세라믹스는높은융점때문에고온에서의부식저항성및기계적물성이요구되는레이저발진부등에서그수요가증가하고있다. 본연구에서는이트리아출발분말의 1차입자크기및비표면적, 밀도등의특성에따른이트리아세라믹스의광학적특성을평가하였다. 투명이트리아소결체제조를위해핫프레스소결을 1500~1600도및 40~60 MPa 조건에서탐색하였으며이후어닐링을실시하여가시광영역에서약 80% 이상의투광도값을갖는소결체를제작하였다. 원료분말의 1차입자분포및비표면적은투명이트리아세라믹스의소결성및광학적특성에영향을미치는중요한인자로본연구에서확인하였다. G3-4 Sintering Properties of Yttria-magnesia Composites using Commercial Powders 상업용분말을이용한이트리아-마그네시아복합체의소결특성고신일 1*, 김하늘 2, 최두현 3, 고재웅 2, 권세훈 1, 박영조 2. 1 부산대학교, 2 재료연구소, 3 국방과학연구소적외선 (IR) 투과특성을가진세라믹은강성이요구되는광학윈도우용소재로서주목을받고있다. 미래에더가혹한환경에서내구성을가지기위해나노결정립을가지는이트리아와마그네시아복 합세라믹에관한연구가 IR 투과및기계적특성분야에서활발히진행되고있다. 그럼에도불구하고이종복합체의굴절률차이로인한 IR 투과율이감소를해결하고자입자크기, 응집과같은초기분말조건및치밀화에관한연구가중점으로진행되고있다. 본연구에서는일반적으로사용하는분말을나노입자합성법이아닌상업용분말을이용하였으며, 하소에따른입자크기및결정화도가소결조건에따른소결체의치밀화및 IR 특성에미치는결과를논하고자한다. G3-5 Thermal Barrier Coating of YSZ Aerogel Composite YSZ 에어로젤합성물을활용한열차폐막윤성원 1*, 김준우 1, 한권덕 1, 최현락 1, 지호일 2, 이종호 2, 심준형 1. 1 고려대학교, 2 한국과학기술연구원이트리아안정화지르코니아 (Yttria stabilized zirconia; YSZ) 는고온에서뛰어난열및화학적안정성을보일뿐만아니라낮은열전도도값을가지고있어열차폐물질로다양한분야에적용되고있다. 에어로젤은내부가서로연결된기공형태로이루어져있는다공구조소재로서초저밀도, 낮은열전도도값, 큰비표면적그리고높은기계적강성으로인해첨단단열소재로서주목받고있다. 본연구에서는 YSZ 에어로젤을솔-젤기법과액체이산화탄소를이용한초임계건조를통하여합성하였다. 제작된 YSZ 에어로젤의미세구조는주사전자현미경을통하여관찰하였다. 고온에서의열안정성을향상시키기위하여소듐실리케이트기반의무기물바인더를 YSZ 에어로젤과혼합하였다. 합성된슬러리를합금소재의기판위에코팅하였으며레이저플래시기법을이용하여열전도도를측정하였다. 그결과YSZ 파우더를플라즈마스프레이방식으로코팅한것에비하여, YSZ 에어로젤합성물이더향상된열차폐성능을나타내는것을확인하였다. 이러한결과는 YSZ 에어로젤합성물로구성된열차폐막이고온환경에서뛰어난열내구성을가질수있음을의미한다. G3-6 A Study on the Silicon Carbide-based Membranes for Potential Microfiltration Applications 탄화규소기반다공성세라믹분리막의제조및특성평가이수진 *, 하장훈, Bukhari Syed Zaighum Abbas, 이종만, 송인혁. 재료연구소현재까지수처리분야에서사용되어온고분자분리막은운용온도의제한과낮은강도및화학적안정성등의문제를가지고있어그적용범위가한정적일수밖에없다. 반면, 세라믹분리막은고온유입수에대응이가능하며, 화학적안정성이뛰어나혹독한환경에서도특유의장점을이용하여적용될수있으며, 분리막의교체주기도감소시킬수있어차세대분리막소재로주목받고있다. 세라믹소재중탄화규소는열적, 화학적안정성이우수하나강한공유결합을이루고있어 2000 o C 이상에서소결이가능한난소결성물질로, 이러한높은소결온도는세라믹분리막으로응용하기에경제적인어려움을발생시킬수있다. 따라서, 이러한문제점을극복하기위하여고령토를소결조제로첨가함으로써점성을지닌입계상을형성하여소결온도를 1400 o C까지낮추어경제적인문제를극복할수있도록하였다. 또한, 정밀여과를위하여알루미나코팅공정을도입하여평균기공크기를 0.11 μm까지감소시켜, 박테리아, 에멀전크기의부유물을걸러낼수있도록하였다. 알루미나다층코팅공정을통해알루미나코팅층의두께에따른분리막의성능을측정하였다. 알루미나코팅을 1회 ( 코팅두께 : 10 μm) 실시했을때, 수투과율은약 m 2 h 1 bar 1 정도였으며, 3회 ( 코팅두께 : 40 μm) 실시했을때, 약 m 2 h 1 bar 78 한국세라믹학회

89 구두발표 1 정도로측정되었다. 이를통해코팅횟수가늘어남에따라, 코팅층의두께가두꺼워졌으나, 수투과율은크게떨어지지않는것을확인할수있었다. 그리고분리막의성능을좌우할수있는파울링은최소화하기위해코팅용알루미나슬러리를볼밀함으로써분리막의표면평탄도를개선하였다. G3-7 Fabrication and Mechanical Properties of Ni-Ti-Al/TiC Composites by using Spark Plasma Sintering Method 방전플라즈마소결법을이용한 Ni-Ti-Al/TiC 복합체의제조및기계적특성이동진 1*, 임영훈 1, 황기하 1, 박재하 2, 강명창 1. 1 부산대학교, 2 ( 주 ) 이레테크 Ni-Ti-Al 합금은고온용구조제로매우유망한소재로주목받고있으나 2 차상첨가를통한고용체를제조하여기계적특성을향상시키는연구가미비하다. 따라서, 본연구는 Ni-Ti-Al 에고용체로써 TiC 를첨가하여 Al 과 Ti 를 TiC 와결합, Ti 2 AlC 의계면을생성하였으며, Ni-Ti-Al 을 5 : 4 : 1 의비율로기계적합금화를진행하고 TiC 의함유량을 20, 30, 40 wt% 의비율로혼합하였다. 혼합된파우더를방전플라즈마소결장비를통해서 1000 o C 에서소결을수행하였다. 본실험에서는상대비교를하고자 TiC 의함유량이없는 Ni-Ti- Al 은기존연구에서진행된 900 o C 에서소결을진행하였다. 소결된시편의기계적특성을평가하기위하여, 밀도를측정하고, FE-SEM 을통해파단면과표면사진을통해미세구조와입자의크기를비교분석하였으며, XRD 를통해형성된상을분석하였다. 마이크로및매크로비커스경도를각각측정하였고, 입자크기에따른부분적인상의경도와전체벌크상태의경도를비교하였다. 그리고마모시험과굽힙강도시험을통해마모량과굽힘강도를측정하였다. 주요한결과로서, TiC 의조성이증가할수록 TiC 의입자주변으로 Ni- Ti-Al 합금이침투하기위해높은소결온도가필요했으며, 1000 에서 30 wt% 함유량에서가장높은경도와굽힘강도를얻었다. 따라서, TiC 의함유량이증가할수록경도는상승하나파괴인성이감소하여굽힘강도가감소한것으로판단되며, 20 wt% 의경우계면에서 TiC 의대부분이 Ti 2 AlC 로합성되어상대적으로경도가감소한것을확인하였다. G3-8 Damage Evaluation in Proton-irradiated SiC f /SiC with Sc-nitrate and Al 2 O 3 -Y 2 O 3 Sintering Additives Sc-nitrate 및 Al 2 O 3 -Y 2 O 3 소결첨가제를이용한양성자조사된 SiC f /SiC의손상평가 Amit Siddharth Sharma *, Pipit, 윤당혁. 영남대학교 For Gen-IV reactors, SiC f /SiC have shown great potential for structural applications owing to its superior properties. Here the degradation mechanisms in SiC f /SiC after proton-irradiation (10 18 p + / m 2, E = 20 MeV) has been presented. SiC f /SiC fabrication involved infiltrating a SiC-based matrix with Sc-nitrate and Al 2 O 3 -Y 2 O 3 additives into Tyranno SA3 SiC preform by electrophoretic deposition and subsequent hot pressing. Comparative assessment of crack formation, pore generation and surface amorphization upon irradiation was carried out using SEM and HRTEM techniques. SiC matrix was comparatively more crack-resistant in the SiC f /SiC with Sc-nitrate than that with Al 2 O 3 -Y 2 O 3 addition. Subsurface porosity evolved distinctively as continuous bands and discrete pockets with Al 2 O 3 -Y 2 O 3 and Sc-nitrate additions, respectively. Selective leaching of Si from the grain surface leads to the formation of a graded structure and surface amorphization. Irradiation-induced roughness on the fibers facilitates easy debonding at the SiC f -PyC coating interface; however no significant changes in the flexural behavior were observed. G3-9 Joining of SiC f /SiC using PCS and PSZ Preceramic Polyemers PCS와 PSZ를사용한 SiC f / SiC composite의접합정동혁 *, Pipit, Amit Siddharth Sharma, 윤당혁. 영남대학교 SiC f /SiC are the prime candidates for high temperature applications, particularly for the structural components of future fusion reactors. However, their practical utilization can only be realized by integrating simple shapes into complex geometries. Therefore, the preceramic fillers leaving a SiC-based material, which have the similar properties to the SiC f /SiC base, are main candidates. To obtain a SiC-rich joint region, we have tried to join SiC f /SiC by pyrolyzing the preceramic polymers, such as polycarbosilane (PCS), polysilazane (PSZ) and their mixtures having various weight ratios. An optimization for the mixture proportion, heating rate, joining temperature and pressure was conducted to minimize pore formation due to evolution of gaseous products during ceramization of these preceramic polymers. A slow heating rate of 2 C/min to 1750 C under 10 MPa along with 2 h holding was employed to obtain the sound and crack-free joints. Room temperature joining strength was estimated using a 4-point flexural test for a butt-joint configuration and correlated with the evolved interfacial microstructure/phases, while the phase evolution and microstructure were analyzed using a SEM, XRD and Raman spectroscopy. G3-10 Joining of SiC Monolith using a Thin MAX Phase Tape MAX 상테잎을이용한 SiC 단미체의접합 Pipit *, Amit Siddharth Sharma, 정동혁, Arifin Septiadi, 윤당혁. 영남대학교 This study reports the joining of SiC monolith using a thin MAX phase tape filler, such as Ti 3 AlC 2 and Ti 3 SiC 2, and the subsequent phenomena leading to the elimination of the joining layer via solidstate diffusion of the MAX phase at high temperatures. A direct SiC joining without filler was also attempted for comparison. The experimental parameters, i.e., temperature, holding time, the type and thickness of joining filler were examined carefully. The joining interface could be eliminated when the SiC monoliths were joined at 1900 o C using a thin Ti 3 AlC 2 tape, showing a high joining strength ~300 MPa. Moreover, the fracturing during mechanical test occurred mainly at the base material rather than the joining interface, indicating the excellent joining properties. These findings highlight the elimination of the joining interlayer, which might be ideal for practical applications because the absence of joining filler helped the preservation of the excellent mechanical properties of SiC at the joint. G3-11 The Effect of the Pore Structure on the Permeability of Porous Alumina Based Ceramics 다공질알루미나세라믹스의기공구조가통기도에미치는영향김재 1*, 하장훈 2, 이종만 2, 송인혁 2. 1 과학기술연합대학원대학교, 2 재료연구소 한국세라믹학회 79

90 2018 년한국세라믹학회춘계연구발표회 The permeability of porous ceramics is a key property in the application such as membrane, hot gas filter and vacuum chuck. In order to estimate and understand the permeability of porous ceramics, Forchheimer equation which establishes a more realistic dependence between the fluid pressure and the fluid velocity instead of Darcy''s law has been used to obtain the permeability constants represented as k 1 and k 2. In this study, permeability constants were obtained through fitting of experimental data. The comparison of three alumina sizes, various sintering temperatures, PMMA with different content and size as the pore former aims to investigate the relationship between permeability constants and either the pore size or the porosity expressed a feature of pore structure. It was found that k 1 /k 2 ratio which can be described as pore size proposed in the literature depended on the average pore size of porous ceramics. G3-12 Low Volumetric Heat Capacity Insulation Coating by Room-Temperature Operating Spray Coating Process 상온세라믹분사공정을통한저열용량저열전도도고내구성다공질단열코팅기술개발윤세중 1*, 한병동 2, 윤운하 2, 안철우 2, 김종우 2, 최종진 2. 1 과학기술연합대학원대학교, 2 재료연구소최근파리협정체제에따른전세계적인온실가스배출규제와자동차연비규제강화로인해차량의연비증대를위한에너지효율향상에대한연구가활발하게진행중이다. 특히강화된환경문제및연비문제에대응할수있는방안으로기존내연기관엔진내열손실저감, 열효율향상기술이해결책으로대두되고있다. 내연기관의열손실을저감, 열효율을향상시키기위해내연기관의연소실내부에단열성이뛰어난세라믹을이용하여치밀한막을코팅하는기술이제안된바있으나, 일반적인세라믹치밀막코팅은엔진의배기행정과정에서열이빠져나가지못하고연소실표면을높은온도로유지시키면서노킹을발생시켜실제적용이어려운문제가있다. 이를극복하기위해선주변환경에따라온도를적절히변화시킬수있는내구성이확보된다공질의저열용량코팅기술이요구된다. 본연구에서는상온에서금속모재위에성막이가능한새로운세라믹분사코팅공정으로금속기판의열손상없이두께 60 μm이상, 접착력 20 MPa 이상, 열전도도 0.6 W/mK, 열용량 1600 kj/ m 3 K 이하의다공성세라믹단열코팅을개발하였으며, 제조된코팅막의미세조직, 열특성및기타물리적특성을비교분석하였다. G3-13 Microstructure Development and Liquid Phase Formation during Sintering of Aluminum Oxynitride 산화질화알루미늄 (AlON) 소결중미세구조개발및액상기구규명민지훈 *, 이지환, 김명동, 윤당혁, 이재형. 영남대학교 This study reports the microstructure and liquid phase formation of aluminum oxyinitride (AlON) by a two-step sintering process. By subjecting the AlON specimens to the second-step sintering at temperature of 1940ºC~1990ºC for 0.3~10 h in a nitrogen gas atmosphere, the average grain sizes in the range of 52~248 μm were obtained. As the grain size increased, the transmittance of the sample increased, and it is believed that the decrease of optical scattering at the grain boundaries was the reason. However, the transmittance decreased at a temperature of or higher than 1960ºC due to the formation of the liquid phase at the sample edge and the grain boundaries. Therefore, by controlling the formation of liquid phase as well as grain size, a transparent AlON with high transmittance and mechanical properties could be obtained. G3-14 Reactive Air Brazing of GDC-LSM Ceramic with Different Metallic Partners for Oxygen Transport Membrane Applications 산소분리막적용에대한서로다른금속들과 GDC-LSM의 reactive air brazing 접합김명동 *, Wahid Muhamad FR, Amit Siddharth Sharma, 윤당혁. 영남대학교 Oxygen transport membrane (OTM) can produce high purity oxygen at low cost by separating oxygen from a compressed air utilizing an oxygen transporting phenomenon through an oxide ceramic membrane at high temperatures. Multiple membrane needs to be supported in a metallic casing and should maintain good hermetic sealing as well as spacing between successive membranes. Efficient oxygen production can be ensured by pore- and crack-free joints between various metals (SUS steel, FeCrAlloy, and Crofer) and GDC- LSM ceramic substrates joined using a reactive air brazing (RAB). Here, we discuss the joining mechanism between the GDC-LSM ceramic with different metallic partners with Ag-CuO tape as a filler for the joining by RAB technique. Brazing was carried out at 1050 C for 0.5 h holding, while some samples were exposed to oxidation test at 800 C for 24 h after joining. Strength of the joints in shear and flexure modes were estimated and correlated with interfacial microstructure, phase formation, and fractured surface characterized using a SEM and EDS. G3-15 Improved Dispersibility of Fe 3 O 4 Nanoparticles with Polar Electrical Properties in Aqueous Solvent 양극성을띈 Fe 3 O 4 나노입자의기능화에의한수계용매내에서의분산성향상차지현 1*, 허재욱 1, 채동호 1, 안계석 2, 최성철 1. 1 한양대학교, 2 한국세라믹기술원 Magnetite (Fe 3 O 4 ) is one of the iron oxide phases which has superparamagnetic characteristic. It is utilized in various industrial areas such as biomedical, high-tech electronic fields. However, magnetic particles with high surface energy and neutrality surface characteristics are difficult to have a dispersion stability in the aqueous solvent. In this study, the dispersibility enhancement of Fe 3 O 4 nanoparticles was performed by surface modification through conjugating functional groups. These groups represent carboxyl and amine groups with positive charge and a negative charge. To obtain these functional groups, the surface was modified with the polymer precursors Poly Ether Imide (PEI) and Poly Arcyl Amide (PAA). The existence of functional groups on the surface of Fe 3 O 4 nanoparticles was confirmed by Fourier Transform infrared (FT-IR). A dispersion stability of each surface modified nanoparticles were analyzed by zeta potential and particle size distribution (PSD). The morphology of the surface modificated Fe 3 O 4 nanoparticles were confirmed by transmission electron microscopy image (TEM). Furthermore, vibrating sample magnetometer was used to investigate the magnetization characteristics (VSM). 80 한국세라믹학회

91 구두발표 G3-16 Morphology and Dispersion Behavior of Carboxylic Functionalized Fe 3 O 4 Nanoparticle 카르복시기기능화 Fe 3 O 4 입자의형상및분산특성연구오아현 1*, 한진순 1, 신재록 1, 안계석 2, 최성철 1. 1 한양대학교, 2 한국세라믹기술원 The superparamagnetic Fe 3 O 4 nanoparticle is promising material for nanosorbents, a medical care and magnetic sensing due to redispersibility in aqueous solution. Also, the particles have been consistently researched to functionalize obtaining the additional function. In introducing this functional groups, carboxyl groups were most suitable for Fe 3 O 4 nanoparticle among various organic functional groups. Representative materials for forming such carboxyl groups on the particle surface include Succinic acid and Polyacrylic acid (PAA). Succinic acid has two carboxyl groups, so one of the two bonds with the functional group that has the negative charge of magnetic particle can immobilize the carboxyl group on its surface. In contrast, PAA can retain a larger number of carboxyl groups. Therefore, in this study, PAA was used as functionalized reagent. Moreover, functionalization process was carried out with adding a various amount of PAA. As a result, the functionalized nanoparticles which were formed according to concentration of PAA were investigated through measurement of morphological changes and surface characteristics. S31-1 Evaluation on the Thermomechanical Durability of Low Thermal-conductible Thermal Barrier Coating Basing on the Single Crytal Substrate 단결정모재기반저열전도성열차폐코팅재의열내구성평가이기성 1*, 최소담 1, 문흥수 2, 오윤석 3. 1 국민대학교, 2 ( 주 ) 세원하드페이싱, 3 한국세라믹기술원가스터빈고온부품은최근 1600 o C의높은작동온도에서기동되고있으며그온도는더욱상승하고있는추세이다. 따라서내열합금모재의경우일방향응고재나단결정모재가연구되고있으며, 세라믹코팅재역시효과적인열차단을위해저열전도성의코팅재가연구되고있다. 열차폐코팅층은내열성, 내열충격성뿐만아니라내크립성, 내피로성, 내마모성등열적, 기계적인가혹한환경에견디어야하므로그내구성평가는매우중요하다. 본연구에서는단결정모재를고온의열로부터차단시키기위하여상용품으로사용되고있는이트리아안정화지르코니아소재 (YSZ) 뿐만아니라열전도도가낮은가돌륨지르코네이트 (Gadolinium zirconate), 란탄-가돌륨지르코네이트 (Lanthanumgadolinium zirconate) 의열차폐코팅재를제작하였으며부가적으로란탄-가돌륨지르코네이트 / 지르코니아 (Lanthanium-gadolinium zirconate/ysz) 의층상형코팅재를제작하였다. 단결정모재와세라믹스코팅재간에는니켈합금계의내열합금의중간재를 200 mm 의두께로코팅하였으며, 열차폐코팅재는총 600 mm의두께로코팅하였다. 코팅방법은대기플라즈마용사법 (APS) 으로코팅하였다. 코팅후고온열내구성평가를위하여등온열싸이클링시험과열충격시험을수행하였다. 열싸이클링시험은고온로에샘플을넣고일정온도까지가열한후 1시간유지하였다가냉각하는싸이클을코팅층에박리가일어날때까지반복하여비교, 평가하였다. 열충격시험은자체개발한열충격로에서하부는 o C, 상부는 1350 o C로유지한상태에서상온으로열충격을가하는싸이클을반복하였다. 열싸이클링시험과열충격시험후계면박리여 부를관찰하였고마모시험과압흔시험으로기계적특성의열화여부를평가하였다. S31-2 Materials Design and Evaluation of Thermal Barrier Coatings 열차폐코팅의재료설계및평가정연길 *. 창원대학교세계적으로발전용가스터빈은고효율화및대형화추세로발전해나가고있으며, 1700 o C의운전온도를갖는가스터빈에대한연구가활발히진행되고있다. 이에가스터빈에적용되는고온부품의열적내구성확보를위한다양한연구가진행되고있으며, 이중고온부품의열차폐성능개선및향상에대한관심이새롭게주목을받아있다. 본발표에서는고온부품의열적내구성향상을도모할수있는열차폐코팅소재와이를이용한층상화설계및열적내구성에미치는영향에대한연구결과, 그리고국외선진기관에서관심을가지고연구개발이진행되고있는자가치유열차폐코팅의설계개념과적용성에대해소개하고자한다. 이와함께, 열차폐코팅의성능을평가하기위해선진사에서적용되고있는다양한평가기법들을소개하고, 이러한평가기법에따라발현되는열차폐코팅의특성과열차폐코팅의평가기법으로의적용성에대한것을논의하고자한다. 열차폐코팅의설계및평가 에대한발표및논의를통해국내에서진행되고있는한국형대형가스터빈개발, 구모델에대한성능향상기술, 고온부품들에대한재생정비기술등에서고온부품의신뢰성향상에기여할수있는열차폐코팅의역할과방안을모색하고자한다. S31-3 Thermo-Corrosive and Mechanical Properties of ZrO 2 based Thermal Barrier Coatings Byung-Koog Jang 1*, Seongwon Kim 2, Yoon-Suk Oh 2, Hyung-Tae Kim 2 and Kee-Sung Lee 3. 1 Kyushu University, Japan. 2 Korea Institute of Ceramic Engineering and Technology, Korea. 3 Kookmin University, Korea Thermal barrier coatings (TBCs) have received a large attention because they increase the thermal efficiency of gas turbine engines by increasing the gas turbine inlet temperature and reducing the amount of cooling air required for the hot section components. Electron beamphysical vapor deposition (EB-PVD) or plasma spray coatings is a widely used technique for depositing thermal barrier coatings (TBCs) on metal substrates for high temperature applications, such as gas turbines, in order to improve the thermal efficiency. The controlled microstructure of coatings is one of the most important properties for obtaining superior TBCs. To optimize TBCs for integration into gas turbines, characterization of the relationship between microstructure and thermal-corrosive properties of the coatings is necessary. The corrosive properties of coatings were evaluated by the corrosive reaction between YSZ coatings by EB-PVD and volcanic ash during oxidation at 1200 C. The thickness of corrosive region at top surface of YSZ TBCs by the reaction between YSZ coatinga and volcanic ash was increased with increasing the oxidation time. In addition, the mechanical properties of YSZ TBCs were evaluated by nano indentation. S31-4 Understanding of Thermal Barrier Coating Characteristics for Gas Turbine Design 가스터빈설계에서의열차단코팅특성에대한이해 한국세라믹학회 81

92 2018 년한국세라믹학회춘계연구발표회 정길진 *. 두산중공업 ( 주 ) 가스터빈의개발에서관련기술들의발전과함께열차단코팅의성능을높여야한다는요구사항이높아지고있다. 높은출력을위한운전온도증가, 높은효율에대한시장요구및장시간운전에대한사용자의요청등이가스터빈의개발에서의고려되는사항이다. 이를만족하기위해서부품재료의개선, 고효율의냉각방식채택등과함께열차단코팅의더높은성능을요구하고있다. 이와관련하여본발표는재료의특성이외에실제부품에적용에고려해야할열차단코팅의성능에관하여미세구조관점에서설명하고자한다. S31-5 The Effects of Bond Coat on the Thermal Cycling Behavior of YSZ Coatings Prepared by EB-PVD EB-PVD YSZ 코팅의열싸이클손상에대한본드코트영향이성훈 *, 박영진, 유연우, 박훈관, 변응선. 재료연구소가스터빈고온부품의보호를위해사용되는열차폐코팅 (thermal barrier coating, TBC) 은가스터빈작동온도를높여고효율화를가능하게한다. TBC 형성을위한단열세라믹소재로서열충격저항성이우수하고열전도도가낮은 YSZ가주로사용되고있다. YSZ 단열세라믹코팅은주로플라즈마스프레이공정 (plasma spray) 또는전자빔증발에의한물리증착법 (electron beam physical vapor deposition, EB-PVD) 에의해제조된다. EB-PVD에의한 YSZ 코팅은수평적층형구조를갖는용사코팅 YSZ와달리수직으로성장된주상정 (columnar) 구조를가지고있어열싸이클에대한내구성이우수한것으로알려져있다. 가스터빈작동환경에서열싸이클에대한내구성을높이기위해서는 YSZ 단열세라믹코팅자체의미세구조제어도중요하지만고온부품소재와단열세라믹코팅사이에형성되는본드코트의영향을고려하여야한다. 본연구에서는확산공정에의한 Aluminide 본드코트와 EB-PVD 공정에의한 MCrAlY 본드코트위에형성된 EB-PVD YSZ 코팅의열싸이클거동을조사하였다. S31-6 Adhesion Characteristics of VO 2 Thin Film Fabricated by Solution-based Process for Smart Window 용액공정으로제조된열변색스마트윈도우용 VO 2 박막접착특성윤지원 1*, 이석재 2, 김광석 1, 김대업 1. 1 한국생산기술연구원, 2 전북대학교전세계적인환경규제는 CO 2 배출및에너지절감등을이끌어낼수있는연구를촉진시켰으며, 그중가시광선투과율은유지하고열선인적외선투과율제어를통해실내온도유지에소비되는에너지를절감할수있는스마트윈도우연구가활발히진행되고있다. Vanadium dioxide (VO 2 ) 는상대적으로낮은 68 o C에서의금속-절연체결정구조변화로인한적외선투과제어가가능하여열변색코팅소재로많이사용되고있다. 기존 VO 2 박막의제조수단인 sputtering이나 CVD 등은공정비용이높고균일하게증착가능한면적의한계가있어 sol-gel 등용액공정을통해극복하려는연구가진행되었으나, 박막의낮은접착강도로인해상용화에걸림돌이되었다. 이러한문제해결을위해, 본연구에서는 VO 2 분말이포함된용매에분산제및바인더를혼합하여나노잉크를제조하였으며, 유리표면에적정량의잉크를스핀코팅한후 IPL sintering 공정을통해박막을제조하였다. 미세조직은 FE-SEM과 TEM, 접착강도는 SAICAS, 계면의원소농도변화는 XPS 및 AES를활용하여분석하였다. 실험결과, IPL sintering 조건에따라계면의형상및잔여유기물의양이변화하였으며, 그로인한접착강도는 1,400 V 전압에 서광소결횟수를 5 ~ 20 회로증가할때 83 ~ 94 N/m 로증가, 2,000 V 경우에는 108 ~ 96 N/m 로감소하였다. S31-7 Formation of YSZ Coatings using Suspension Vacuum Plasma Spraying 서스펜션진공플라즈마스프레이공정을통한 YSZ 코팅의형성유연우 *, 남욱희, 변응선. 재료연구소차세대가스터빈의개발과더불어터빈블레이드의수명을증가시키기위해다양한연구가수행되었다. 그중터빈블레이드하부의초내열금속을고온산화환경으로부터보호하기위한열차폐코팅관련연구가활발히진행중이다. 열차폐코팅은상부세라믹탑코팅과하부금속본드코팅으로이루어져있으며, 이를형성하기위해다양한공정방법이개발되었으나현재널리사용되는공정은플라즈마스프레이공정이다. 플라즈마스프레이공정을통해형성된세라믹탑코팅은라멜라구조로형성되어낮은열전도도를보이는장점을갖고있으나, 고온수명이취약하다는단점을갖고있다. 고온수명을향상시키기위해서스펜션플라즈마스프레이공정이개발되었으나, 서스펜션내용매로인해공정속도가현저히감소하는단점을가지고있다. 본연구에서는서스펜션진공플라즈마스프레이공정을활용하여서스펜션대기플라즈마스프레이가갖는단점을해소하고자하였다. 나노미터크기의입도분포를갖는 YSZ 서스펜션을사용하여다양한공정조건에서 YSZ 코팅을형성하였으며, 서스펜션대기플라즈마스프레이대비향상된공정속도를보였다. 형성된 YSZ 코팅의미세구조를분석하였으며, 이를통해공정파라미터가 YSZ 코팅의미세구조에미치는영향을파악하였다. S31-8 Effect of Y 2 O 3 Thermal Spray Powder for Thermal Spray Coating Layer Y 2 O 3 용사분말특성이용사코팅층에미치는영향문흥수 *, 신평우, 이훈철, 김민식. ( 주 ) 세원하드페이싱 Y 2 O 3 는반도체 / 디스플레이공정에용사코팅되어사용되어지고있다. 최근 Y 2 O 3 치밀막을구현하기위해대기플라즈마 (Atmosphere Plasma spray, APS), Suspension Plasma spray, Aerosol Deposition 등다양한방법으로연구되고있다. 본연구에서는대기플라즈마용사코팅 (APS) 공정에서코팅층의치밀도에미치는영향을파악하기위하여 Y 2 O 3 용사분말의크기및용사분말의유동특성을변화시키고, 이에따른코팅특성을평가하여용사분말의크기와유동특성이코팅층에미치는영향을연구하였다. S31-9 Thermal Insulation Coatings for Internal Combustion Automobile Engines 내연기관용엔진단열코팅기술한병동 1*, 윤세중 2, 최종진 1, 안철우 1, 민유호 1, 오윤석 3. 1 재료연구소, 2 과학기술연합대학원대학교, 3 한국세라믹기술원 Under the Paris Agreement on Climate Change, all countries including developing countries are strongly responsible for reducing greenhouse gas emissions, which results in putting pressure on the auto industry to drastically increase the average fuel economy of each company s fleet. Many researchers have carried out a large number of studies on in-cylinder thermal insulation ceramic coatings to improve engine thermal efficiency and fuel economy. High-density ceramic materials, which have low thermal conductivity, have been commonly coated on metals such as an aluminum or iron alloy, succeeding in reducing heat loss by decreasing the temperature difference between 82 한국세라믹학회

93 구두발표 the in-cylinder gas and the combustion chamber wall. However, these coatings caused constantly high temperature on combustion wall surface during the whole stroke, and therefore led to engine knocking problem and deterioration of the engine s lifespan. To overcome these problems, novel porous ceramic coatings, which have low thermal conductivity and low heat capacity, have been recently developed. These porous ceramic coatings are reported to result in a large change in the combustion chamber wall temperature during the whole cycle and keep the engine from knocking. In this work, we have investigated a variety of coating materials and reliable coating methods for lowthermal-conductivity and low-heat-capacity ceramic materials. Characterization of the resultant coating materials was also performed. S32-1 Ablation of Ultra-high Temperature Ceramics 초고온세라믹재료의삭마특성이세훈 1*, 김준섭 1, Nguyen Van Quyet 1, 홍성민 2. 1 재료연구소, 2 전북대학교 2700 o C의초고온환경에서도우수한내삭마특성을나타내는 HfC- SiC, HfB 2 -SiC 세라믹나노복합재료와 C f /HfC-SiC UHTCMC를제조하였다. 제조된나노복합재료및 UHTCMC는 2700 o C, 대기중에서 Mach 0.6의불꽃속도로 Oxy-acetylene torch를이용하여 20분이상삭마실험을수행하였다. 대기중, 30분삭마후 HfC- SiC 복합체의표면에형성된산화막의두께는 200 mm 이하로매우우수한초고온산화안정성을나타내었다. 또한탄소섬유를포함하는 C f /HfC-SiC UHTCMC의경우 20분삭마실험후에도내부의탄소섬유가산화되지않고잔류하였으며, mm/s의매우낮은삭마율을유지하였다. 이결과를 Plasma Arc-jet wind tunnel 을이용한삭마실험결과와비교하였다. 제조된고순도의 UHTC는 oxy-acetylene torch 뿐아니라더높은에너지를갖는 plasma arc jet wind tunnel test에서도우수한내삭마거동을나타내었다. 탄소섬유가포함된 UHTCMC의경우장시간의 oxy-acetylene torch test를수행할경우탄소섬유의산화로인하여다공체형태로변화되었으며시편내부까지산화가진행되었으나, 공정최적화에의해탄소섬유의산화를억제할경우장시간삭마후에도시편내부의산화를효과적으로억제할수있었다. Plasma arc-jet을이용한삭마의경우특정조건까지는우수한삭마거동을나타내던소재가이이상의에너지를받을경우급격한삭마가발생하였으며, 이러한현상은소재의조성에영향을받았다. S32-2 Synthesis and Characterization of High Purity Hafnium Carbide Fine Powder 고순도 Hafnium Carbide 나노분말의합성및특성평가김준섭 *, 이세훈. 재료연구소 Hafnium dioxide (HfO 2 ) 와카본소스인페놀레진의열탄화환원반응을이용하여고순도의 Hafnium Carbide (HfC) 나노분말을합성하였다. 분말합성에는 SPS (Spark plasma sintering) 장치를이용하였고, 1600 o C, 공조건에서합성하였다. 원료분말인상용 HfO 2 분말의분산특성을향상시킴으로써적은카본소스를이용하여잔류산소를없애고과잉탄소를최소화한 HfC 분말을합성하였다. HfO 2 분말의분산을위해서 Microfluidizer를이용하였고 3회분산처리후 HfO 2 의평균입경은 230 nm에서 130 nm로크게줄어들었다. 합성된분말의 XRD 측정결과 C/Hf 비율의증가와함께 HfO 2 피크강도가감소하였으며 3.3 이상에서순수한 HfC 피크만검출되었다. 이전의연구결과 (C/H = 3.6) 와비교하였을때 C/Hf 비율이 10% 이 상크게감소하였음을알수있었다. C/H = 3.3 일때 HfC 분말의평균입경은약 100 nm 였으며 C/Hf 비율변화에따른입자크기변화는크지않았다. 합성된입자의형상은모든합성조건에서구형에가까운형태를나타내었고 C/Hf = 3.3 인조건에서합성된분말의순도는 > 99.9% 으로나타났다. 또한다양한조건에서합성된분말을 SPS 를이용하여 2000, 80 Mpa 소결한후소결체의미세구조분석을통하여잔류산소및과잉카본의영향에대해서도조사하였다. S32-3 Effect of ph Polarity on the Physical Properties of SiC based Diesel Particulate Filter (DPF) Bonding Materials SiC 기반디젤매연저감장치 (DPF) 용접합재의 ph 극성변화에따른물성변화김진원 *, 홍동민, 한성진. ( 주 ) 아이비머티리얼즈 Diesel Particulate Filter (DPF) 란디젤엔진의배출가스중매연을저감시키는매우효과적인장치이다. 이러한 DPF는형태와소재에따라크게구분되는데이중 SiC를기반으로하는 DPF는다른소재의 DPF에비해우수한내열특성과높은여과효율을가짐에도불구하고높은열팽창계수로인한단일허니컴 (honeycomb) 의일체형으로제조가불가능하다. 이에 SiC DPF는세그먼트 (Segment) 단위로제작하고각세그먼트를세라믹접합제를이용하여접합후완제품을제조하는방식이널리이용되는데이때사용되는세라믹접합제의소재물성에의해 SiC DPF의열적, 물리적성능이일부결정된다. 본연구에서는 SiC DPF의접합을위한바탕재와접합재의주성분인 Silica Sol의 ph 극성변화에따른물성변화를비교평가하였다. 제조된접합제는 X-ray 회절분석법 (XRD) 과주사전자현미경 (SEM) 을이용하여결정성및미세구조, 성분원소의변화를확인하였으며 SiC DPF의내열충격성에영향을주는요인중하나인열팽창계수와 ASTM C 1161 규정에따른 4점굽힙강도와급속냉각평가를통한열적내구성에대하여비교평가하였다. S32-4 Fabrication of Ceramic beads by Emulsification of ZrO 2 Slurry in a Taylor Reactor 테일러반응기에서의 ZrO 2 슬러리의유화반응을통한세라믹비드제조손유아 1*, 남산 2, 류병환 1, 최영민 1, 진항교 1, 정선호 1, 이수연 1, 정성묵 1. 1 한국화학연구원, 2 고려대학교 As the importance of nano process technology such as materials for energy storage, materials for flexible devices, and materials for harmful substances increases, demand for micro-ceramic balls is increasing. High sphericity and uniformity are required for high crushing power and long lifetime of micro-ceramic beads. In this study, ceramic beads were prepared by gel casting method using slurry prepared by mixing partially stabilized zirconia, dispersant, monomer, and cross - linking agent and then adding initiator. The slurry and oil phase were emulsified using a Taylor reactor for mechanical agitation. The size of the emulsion droplet was controlled by the variation of the flow parameter due to the variation of the Taylor number (Ta) and the Reynolds number (Re). As the rotational speed of the inner cylinder increased, the smaller the size of the fine beads was, the higher the Ta value was. When the distance between the inner wall and the outer s of the Taylor reactor was 1 mm and 2.75 mm, the size of the prepared micro beads ranged from 5 to 50 μm and from to 20 to 100 μm, respectively. 한국세라믹학회 83

94 2018 년한국세라믹학회춘계연구발표회 S32-5 Ultra-high Temperature Oxidation/ablation Behavior of HfC-SiC Composite HfC-SiC 복합소재의초고온산화 / 삭마거동연구성영훈 1*, 백창연 2, 김주형 2, 공정훈 2, 김동석 3, 이세훈 4, 김도경 2. 1 한국에너지기술연구원, 2 한국과학기술원, 3 한국원자력연구원, 4 재료연구소초고속조건에서사용되는차세대비행체는그개발에있어소재가가장중요한문제라고할수있다. HfC-SiC 세라믹은매우높은융점과높은기계적물성으로이러한용도에적합한후보소재로주목받고있다. 본연구에서는 SPS를이용한반응소결을통해제조된 HfC-SiC 복합소재를비교적긴노출시간 (5 ~ 30 분 ) 동안 oxy-acetylene flame 환경하에서산화 / 삭마시험을실시하였다. 시험온도는 2500도이상이었으며, SEM과 XRD를통해소재의미세구조및화학종변화를분석하여, 표면에 HfO 2 와 SiO 2 복합산화층이생성되었음을알수있었다. 시간에따른산화깊이를통해 oxidation kinetics 를계산한결과 diffusion control kinetics 거동을따르는것으로나타났으며, 이를토대로 HfC-SiC 소재의산화 / 삭마메커니즘을도출하였다. S32-6 Chemical Vapor Deposition of HfC in HfCl 4 -C 3 H 6 -H 2 HfCl 4 -C 3 H 6 -H 2 계에서 HfC의화학기상증착김대종 1*, 한장원 2, 이현근 1, 박지연 1, 김원주 1. 1 한국원자력연구원, 2 서울대학교초고온세라믹스 (Ultra-High-Temperature Cramics, UHTCs) 중하나인 HfC는융점이약 3900 o C에이르며, 우수한고온강도및내삭마특성을가진다. 특히 HfC의산화물인 HfO 2 역시융점이약 2800 o C로높기때문에극초음속비행체등의초고온부에사용되기에적합하다. HfC는난소결성소재로 SiC와같은저융점의소결조제를첨가하여방전플라즈마소결법 (Spark Plasma Singtering Process, SPS) 등으로제조할수있다. 그러나저융점의혼합물들은고온극초음속대기환경 (hypersonic air stream) 에서액상으로변하며흘러나가없어지는현상 (blow off) 이발생하여구조건전성이크게저하될수있다. 본연구에서는 HfCl 4 -C 3 H 6 -H 2 계에서화학기상증착법으로고순도의 HfC를제조하였다. 복합체의탄소강화섬유의보호코팅및화학기상침착공정을고려하여 1300 o C의저온에서화학기상증착하였으며, 열역학계산을통해최적의화학기상증착조건을도출하였다. 이를통해고밀도 / 고순도 HfC 코팅층을제조하였으며, 균일한두께를가지는 HfC를탄소섬유성공적으로증착하였다. S32-7 Fabrication and Evaluation of C/SiC Composites by CVI- PIP Process CVI-PIP공정으로 C/SiC 복합체제조및평가김경미 1*, 최균 1, 이종흔 2. 1 한국세라믹기술원, 2 고려대학교탄소탄화규소복합재료 (C/SiC) 는세라믹스의낮은파괴인성을극복하고 C/C의낮은산화저항성을향상시키기위하여개발되었다. C/SiC는고온산화분위기에서도탄소섬유가갖고있는높은강도와인성을가지기때문에극한환경용구조재료로써활발히연구되고있다. 대표적인복합재료제조공정은화학기상침투법 (CVI) 과고분자함침열분해법 (PIP) 용융침투법 (MI) 이있다. 본연구에서는 CVI공정과 PIP공정을조합하여 C/SiC를제조하였다. CVI공정은보강섬유를둘러싸며성장하는고순도의기지상을형성시킬수있고, PIP공정은섬유다발사이의큰기공에서기지상형성에효과적이다. CVI공정은직조섬유사이로반응가스를침투시킨후열분해를통해기지상을형성시키는데, 특히내부로의 기지상의원활한침투를위해프리폼표면의치밀화를억제해야한다. 따라서균일한치밀화를위한공정조건에대해전산유체역학 (CFD) 시뮬레이션을진행하였고예측결과를기반으로 C/SiC 를제조하였다. 제조된 C/SiC 는강도와미세조직간의연관성을확인하기위하여 SEM, TEM, XRD 를통해분석하였다. S32-8 HfC on Carbon Composites Obtained by Suspension Vacuum Plasma Spraying 서스펜션진공플라즈마스프레이를통한탄소복합재료상 HfC 코팅형성유연우 1*, 남욱희 1, 변응선 1, 이형익 2, 박종규 2. 1 재료연구소, 2 국방과학연구소탄소복합재료는고온기계적물성이우수하고낮은밀도로인해차세대초음속비행체의고온부품소재로활용가능하다. 하지만탄소복합재료는산소가포함된고온환경에서는탄소의산화반응으로인해급격히기계적물성을잃어버리는단점이존재하여내산화코팅을형성하여탄소의산화를방지하는것이필수적이다. 이러한내산화코팅의소재로 SiC가활발히연구되었으나, 1700 도이상의초고온환경에서는 SiC의산화로형성된 SiO2가휘발하기때문에하부탄소복합재료를충분히보호하기힘들다는단점이존재한다. 따라서, LPCVD, PVD, 진공플라즈마용사 (VPS) 등다양한공정을통해초고온산화환경에서도사용가능한초고온세라믹스 (ultra high temperature ceramics, UHTCs) 코팅을형성하기위한연구가수행되었다. 본연구에서는탄소복합재료상 HfC 코팅을형성하기위하여서스펜션진공플라즈마용사공정을사용하였다. 나노미터입도분포를갖는 HfC 분말을포함하는서스펜션을제작하였으며, 제작된서스펜션을활용하여고밀도의 HfC 코팅을형성하였다. S32-9 Effects of SiC-based Filler Contents on the Properties of SiC f /SiC Fiber-reinforced Ceramic Composites made by Precursor Impregnation and Pyrolysis Process SiC filler의함량이전구체함침법으로제조된 SiC f /SiC 세라믹섬유강화복합재료에미치는영향이세훈 *, 김준섭, Gu Jian, 이희정. 재료연구소 PyC 코팅된 Tyrano-SA3 SiC 섬유와액상의 polycarbosilane (PCS) 전구체를이용하여 SiC f /SiC 세라믹섬유강화복합재료 (Ceramic matrix composites, CMC) 를 PIP 공정을이용하여최대 φ mm의 tube형소재로제작하였다. 기계적합금법 (Mechanical alloying) 으로제조된평균입경 170 nm의 SiC 분말을이용하여제조한슬러리의함량을 20, 30, 40, 60 vol% 로조절한후이를섬유에함침시킨성형체내부로의액상전구체의함침효율을분석하였고그결과얻어진CMC의특성을조사하였다. 섬유에함침시킨슬러리의함량이 30 vol% 이상일경우섬유에함침된슬러리는건조후섬유외부에단단한분말층을형성하여추가적인슬러리의함침을어렵게하였으며특히 60 vol% 슬러리의경우추가적인슬러리함침이거의발생하지않았다. 60 vol% 슬러리를함침시킨성형체의경우액상 PCS 전구체의함침및열분해에의한 CMC 의질량증가는 4 cycle까지선형적으로증가하다가이후 7 cycle 까지완만해지는거동을나타내었으나 6 cycle 함침후 1700 o C에서열처리된 CMC의경우열처리후뚜렷한질량감소가관찰되었으나 7 cycle 때의질량증가도뚜렷히나타났다. 다양한슬러리함량으로제조된 SiC f /SiC의 PIP cycle에따른밀도변화및기계적특성변화를조사하였다. 84 한국세라믹학회

95 구두발표 S32-10 Preparation of TaC/SiC Coating by Chemical Vapor Deposition on C/C Compoisite 탄소 / 탄소복합체에화학기상증착법을이용한 TaC/SiC 코팅층의제조김현미 1,2*, 심광보 1, 최균 2. 1 한양대학교, 2 한국세라믹기술원초고온세라믹스 (UHTCs) 는일반적으로 3000 o C 이상의융점을가지고있으며, 우수한고온특성때문에극한환경분야의소재로활발한연구가진행되고있다. 이중에서 TaC는특히높은융점과우수한내삭마성, 내화학성을가지고있어우주항공분야에서유망한소재이다. 고온환경에서산화와삭마에취약한탄소 / 탄소복합체 (C/C) 에 TaC 코팅을함으로써우수한초고온물성의제품을얻을수있다. TaC와 C/C 사이의열팽창계수를줄이는방안으로는 SiC 코팅층을사이에추가하는 TaC/SiC 코팅방법이제안되었다. 본연구에서는화학기상증착법 (CVD) 을통하여 C/C 위에 TaC/SiC 코팅층을제조하였다. CVD로원하는상의코팅층을얻기위해서는공정변수의정교한설정이필요하기때문에, 열역학계산프로그램 (Factsage 6.2) 을통해열역학분석을진행하였다. 이계산결과를기반으로공정압력, 온도및조성에따른석출되는상의영역을그래프로나타내었고, TaC 증착공정조건을설정하였다. 증착된코팅층은열역학계산결과로예측된결과와부합하는지 XRD를통해확인하였다. G4-2 Transparent and Flexible Piezoelectric Nanogenerator with Shape-Modulated ZnO Nanorods on Graphene Electrodes 형상제어된산화아연나노로드 / 그래핀전극기반의투명하고유연한압전소자장한별 1*, 손명우 1, 이미소 1, 이웅 2, 함문호 1. 1 광주과학기술원, 2 창원대학교 Considerable attention has been paid to developing wearable devices with lightweight electrical power supplies. A piezoelectric nanogenerators (PENG) is one of the most promising candidates for miniaturized electrical power supplies. Several studies on PENGs based on ZnO nanorods or nanowires have been reported. However, there are still many challenges in developing fully flexible and transparent PENGs because of difficulty of incorporating a piezoelectric component and a transparent electrode into one flexible device. Furthermore, although carrier concentration and morphology of piezoelectric component, ZnO significantly affect its piezoelectric properties, it remains not fully understood. In this study, stamping transfer enabled the fabrication of flexible and transparent PENGs based on hybrid structures with geometry-controlled ZnO nanorods and graphene electrodes on PDMS/PET substrates. The differences in the power generation performance were explained in terms of the differences in the deformation modes of ZnO nanorods during the bending of the PENG structures due to the shape controllability of the metallic additives, as well as changes in the carrier concentration with doping. G4-3 Facile Synthesis of Gadolinium Doped Ceria for Ion Transport Membrane Ion Transport Membrane 제조를위한 GDC (Gadolinium doped Ceria) 합성연구진연호 *, 정우철, 최진주, 양재교. IAE고등기술연구원 Ion Transport Membrane (ITM) 혹은 Solid Oxide Membrane (SOM) 로불리는기술은금속제련분야에주목받고있다. 산소이온투 과멤브레인을이용한금속제련기술은기존의 Pidgeon process 방법에비해 CO 2 발생량을크게절감할수있을뿐만아니라, 에너지효율이매우높아전력소모도현저히낮출수있는장점이있다. 이러한산소이온투과멤브레인을이용한제련공정개발을위해제련반응온도에서높은이온전도도를갖는물질개발이선행되어야한다. YSZ, GDC 등이후보대상물질로알려져있다. 본연구에서는 GDC 를 Solid-State 방법과 Urea-mediated hydrolysis 방법으로각각합성 / 비교하였다. 우레아를이용한가수분해 / 석출을이용한공정은 Gadolinium nitrate hydrates 와 Cerium nitrate hydrates 를전구체로사용하였다. 가수분해반응은 100 도미만의온도에서우레아 (NH 2 ) 2 CO 의농도변화에의해합성분말형상제어하였다. 가수분해된분말을 700 도 2 시간열처리를통해최종적으로 GDC 분말로회수할수있었다. 최종적으로합성된 GDC 분말은 X-ray diffractometer (XRD) 를통해 Phase 분석을진행하였으며, Gadolinium doping 양확인을위해 XRF, TEM(EDX) 분석등을통해정량 / 정성분석을진행하였다. 최종적으로합성된 GDC 의이온전도도측정을수행하였다. G4-4 Highly Concentrated Single-Chain Atomic Crystal LiMo 3 Se 3 Solution Using Ion Exchange Chromatography 이온교환크로마토그래피를이용한고농축단일사슬원자결정 LiMo 3 Se 3 용액채수동 1*, 오승배 1, Akhtar Jahan Siddiqa 1, 김지훈 1, 이원규 1, 장우성 1, 이주송 2, Linlin Chi 1, 허준석 1, 최경환 1, 장지민 1, 김수민 2, 최재영 1. 1 성균관대학교, 2 한국과학기술연구원 An important requirement for nanoelectronics is obtaining devices with identical performance. Among the low-dimensional nanomaterials, one-dimensional inorganic nanowires exhibit unique physical and chemical properties because of their single structure. Thus, for their applications, monodispersed nanowires are necessary. This study reports an effective method to obtain highly concentrated single-chain atomic crystal LiMo 3 Se 3 in aqueous solution. The methodology involves replacing the Li + ions with protons via ionexchange chromatography. After the ion-exchange, 99.98% of the Li + ions are effectively removed and a monodispersed nanowire solution is obtained for the concentrations up to 1 mg ml 1. This behavior is different from those reported previously, wherein the amount of nanowire bundles increased with an increase in the concentration. This may be attributed to the enlargement of the Stern-layer distance in the electrical double layer, which is in turn caused by the larger effective volume of the hydrated proton compared to that of the hydrated Li + ion. G4-5 Viscoelasticity Behavior of Various Organo Silane Treated Ceramic Resins and Its Relationship with Mechanical Properties of 3D-printed Objects 다양한유기실란처리된세라믹수지의점탄성거동과 3D인쇄물의기계적특성과의관계송세연 1*, 이정우 2, 윤지선 1. 1 한국세라믹기술원, 2 부산대학교 To investigate dispersion stability and viscoelasticity behavior of the ceramic/photopolymer composite solution for stereolithography 3D printing process, Al 2 O 3 ceramic particle was firstly coated through hydrolysis and condensation reactions using silane coupling agents (SCAs) with the same methoxy group and different organo functional group. The coated ceramic particles were highly dispersed in the 한국세라믹학회 85

96 2018 년한국세라믹학회춘계연구발표회 commercial photopolymers of High-temp resins based on interpenetrating network (IPN) phenomena. The average coating thickness and particle size distribution of the SCA-coated Al 2 O 3 ceramic particles were investigated by FE-TEM and particle size analyzer. The dispersion stability and viscoelasticity behavior of the SCA-coated Al 2 O 3 /High-temp composite solutions according to different organo functional groups were evaluated by relaxation NMR, Turbiscan and viscoelasticity analysis. The improved mechanical properties of 3Dprinted objects were observed in the organo silane treated ceramic resins with the strongest viscoelastic behaviors. G4-6 Stable, Non-Close-Packed Gold Nanowires with 6-Fold Rotational Symmetry 60 회전대칭을갖는안정한비조밀충진구조의금나노와이어이선희 *, 신현정, 배창득. 성균관대학교 Gold has been known as the noblest metal with only face-centered cubic ( fcc) structure in ambient conditions. Here, for the first time, we show stable hexagonal non-close-packed (ncp-2h) gold nanowires having about 50 nm in diameter and aspect ratios well over 500. Nanotubular TiO 2 grown by atomic layer deposition technique were used as photocatalyst for reduction of HAuCl 4 precursors while proving confined volume. Some of the resulting gold nanowires has been proved to be the ncp-2h structure by electron diffraction study. TEM tilting experiments and XRD were used carefully to characterize the crystal structure of the resulting gold. We observed the 6-fold rotational symmetry, which is symmetrically different from the fcc structure. This new polymorph was identified as hexagonal ncp-2h structure with lattice parameter of a = A and c = A showing a quite large interplanar spacing (c/a ~2.48). That is, gold atoms are close-packed along the ab plane, but each is not closely stacked along the c axis like in graphite. This structure is expected to be unstable, but the present ncp-2h gold was stable under ambient and intense electron beam irradiation, and showed the thermal stability up to 400 o C. The resulting physical properties as a result of the corresponding electronic structures change were investigated by comparing the optical properties of fcc and ncp-2h gold nanowires. We also confirmed that the formation of ncp-2h gold is closely related with the volume of the confined structure. G4-7 Substrate-induced Doping and Strain Effect of Graphene 기판에의한그래핀의도핑과변형효과지은지 *. 연세대학교 Graphene is a highly sensitive material, strongly influenced by environment. Because atomically flat graphene should be supported on a rough and imperfect substrate, the supporting substrate determine characteristics of graphene sitting on it. Generally, graphene devices fabricated on a SiO 2 substrate are highly disordered, leading to degrading of the intrinsically superior properties of graphene. In most of experiments, the graphene devices are p-doped and shows much smaller carrier mobility than theoretical mobility limit; meanwhile the suspended graphene over the substrate show the highest mobility due to absence of substrate effect. Here we report effect of substrate on doping and strain of graphene. In exfoliation process of graphene on a SiO 2 substrate, many molecules from air are captured under the graphene. Even though more hydrophilic SiO 2 substrate causes higher doping level in the graphene, water molecules on graphene surface or on SiO 2 have no significant effect on graphene doping. Our density functional theory (DFT) simulation shows that hydroxyl molecules on SiO 2 is main cause of the graphene doping. In addition, it was revealed that annealing of graphene makes strain of graphene released. Our work provides more pronounced understanding for doping and strain of graphene on the substrate, which is essential for control of electrical properties of graphene. G4-8 A New Paradigm for Graphene Synthesis: Transfer-Free Large-Scale, High-Quality Graphene on Polyethylene Terephthalate (PET) Substrates 그래핀성장의새로운패러다임 : PET 기판위에 150 o C에서전사공정이없은대면적, 고품질그래핀의직접성장윤순길 *, 박병주. 충남대학교 Direct graphene synthesis on flexible substrates via chemical vapor deposition (CVD) is an attractive approach to manufacturing flexible electronic devices, as it avoids the drawbacks of transferred graphene. To fabricate flexible devices on plastic substrates, the graphene synthesis temperature must be below ~200 C to prevent substrate deformation. 1,2 In this study, high-quality graphene was directly synthesized on a variety of substrates via the introduction of ultra-thin titanium, which possesses a strong affinity for carbon. The various functions of neither the graphene nor the substrates were influenced by the 10-nm-thick titanium because the titanium was oxidized naturally upon exposure to air. Herein, we provide experimental evidence for 4-inch wafer-scale, high-quality graphene grown on titanium-buffered substrates at low temperatures (below 150 C) under a CH 4 /H 2 atmosphere via plasma-assisted thermal chemical vapor deposition (PATCVD). We applied the proposed methodology to the fabrication of flexible and transparent thin-film capacitors with directly grown top- and bottom-graphene electrodes. These findings could pave the way for a practical exploitation of flexible electronic devices via large-scale, high-quality monolayer graphene synthesized directly with no need for transfer processes. 1. Anthopoulos, T. D. et al. Solution processible organic transistors and circuits based on a C70 methanofullerence. Appl. Phys. 98, (2005). 2. Hummelen, J. C., Yu, G., Gao, J., Wudl, F. & Heeger, A. J. Polymer photovoltaic cells: Enhanced efficiencies via a network of internal donor-acceptor heterojunctions. Science 270, (1995). G4-9 Layer-by-layer Oxidation of MoS 2 using Oxygen Plasma Treatment 산소플라즈마를이용한이황화몰리브덴의산화강소정 1*, Jianwu Shi 2, 정재환 1, 이관형 1. 1 연세대학교, 2 Henan University Two-dimensional semiconductors including MoS 2 and WSe 2 are promising materials for future device owing to their superior properties such as high mobilities, transparency, and flexibility. Transition metal dichalcogenide (TMD) materials have different band structure depending on the number of layers. The control of the number of layer is very important issue for the optical and electrical properties of them. In this research, our customized O 2 plasma system is used to either thin down or oxidize the layer to acquire monolayer 86 한국세라믹학회

97 구두발표 MoS 2. Especially with oxidation mode, the top layer of MoS 2 was oxidized to MoO x leaving the bottom layer intact, resulting in the high photoluminescence intensity corresponding to that of monolayer MoS 2. Our work provides an effective way for the formation of monolayer MoS 2 from a multilayer flake, which is essential for fundamental studies and engineering of 2D materials. G4-10 Chemisorption-based Charge Transfer and CO 2 Detection in Graphen 손명우 *, 김기현, 지상수, Francis Malar Auxilia, 함문호. 광주과학기술원 Graphene is one of the most promising materials for chemical and biological sensor applications because of its extremely high surface area, high carrier mobility, and high electrical conductivity. In particular, the electrical properties of graphene can be easily modulated by molecular adsorption, and organic molecules and metal nanoparticles can be used as functional materials for enhancing the sensitivity and selectivity. In this study, we fabricate chemiresistive sensors for CO 2 gas detection, based on graphene co-functionalized with poly(ethyleneimine) (PEI) and poly(ethylene glycol) (PEG). The graphene devices coated with PEI/PEG of a relative ratio of 1 : 3 exhibited the maximum sensitivities of 32% at 5,000 ppm CO 2 in air with 60% RH at room temperature. The charge transfer behavior of graphene and PEI/PEG upon CO 2 exposure was discussed, and this charge transfer relation will facilitate the development of portable graphene-based sensors for real-time gas detection. G4-11 High Quality M o Nolayer Graphene Grown Directly at Low temperature via Thermal CVD 화학기상증착법을이용한저온에서직접성장한고품질단층그래핀연구박병주 *, 윤순길. 충남대학교 Direct graphene growth on functional substrates via chemical vapor deposition (CVD) is an attractive approach to manufacturing flexible electronic devices, as it avoids the drawbacks of transferred graphene. To fabricate flexible devices on plastic substrates, the growth temperature must be below ~200 C to prevent substrate deformation. Here, we report the direct growth of wrinkle- and defect-free graphene on flexible substrates at low temperatures and without transfer processes. We show that defect-free graphene can be directly grown on a variety of substrates via the introduction of an ultra-thin titanium buffer layer, due to perfect lattice matching between titanium and carbon atoms. We further show that titanium layers with a thickness of ~10 nm do not influence the transmittance or electrical conductivity of functional substrates. We report theoretical and experimental evidence for high-quality graphene grown on titanium-buffered substrates at 150 C. We applied the proposed methodology to fabricate flexible and transparent thin-film capacitors with direct grown top- and bottom-graphene electrodes. These findings could pave the way to the practical exploitation of flexible electronic devices via large-scale high-quality monolayer graphene grown directly with no transfer processes. G4-12 Photo-response Mechanism of Graphene-on-GaN Schottky Junction Photodiodes GaN- 그래핀쇼트키접합을이용한 photodiodes 의광반응메커니즘분석이재형 *, 박원일. 한양대학교 Graphene produces an atomically thin, flat and uniform Schottky contact with the semiconductor, enabling a large, well-defined photoactive area. Especially, the graphene on n-type GaN (Gr-GaN) Schottky Junction photodetectors (SJPDs) are of great interest due to their high responsivity and large active area. Here, we fabricated a Gr- GaN SJPD with particular attention to the interface of the Schottky contact. This allowed us to create a high-performance SJPD showing distinct photovoltaic and photoelectric responses, with V oc of 0.57 V and maximum responsivity of ~110 ma/w at V a = 1 V. Timedependent analysis of the UV response of the photocurrent (I p ) allows a direct observation of the photo-carrier dynamics under various applied bias (V a ). Importantly, this study reveals distinctly different responses of I p as a function of V a. The underlying mechanism of the anomalous response is elucidated by considering the interplay between UV irradiation-induced electrostatic molecular interactions over the graphene sheet and trapped charges at the defect state in the GaN thin film. G4-13 Atomically-precise Graphene Etch Masks for 3D Integrated Systems from 2D Material Heterostructures 2차원이종접합구조기반 3차원집적시스템구현을위한초정밀그래핀식각마스크권준영 1*, 손장엽 2. 1 연세대학교, 2 University of Illinois, Urbana- Champaign In next generation molecular nanotechnologies, atomically-precise fabrication methods are needed to controllably, scalably and reproducibly engineer devices with designed functionality. Here, we demonstrate the novel use of monolayer graphene as a etch mask in van der Waals (vdw) heterostructures and application in nanoelectronic and nanomechanical devices. With the exception of graphene, most 2D materials are etched through exposure to xenon difluoride (XeF 2 ) gas. In contrast, graphene is fluorinated into highly resistive and gas impermeable fluorographene (FG). We fabricated contacts to graphene devices encapsulated within hexagonal boron nitride (hbn) layers, where deposited metal contacts only the FG regions through etched holes in the hbn. The devices showed remarkably high carrier mobility of ~140,000 cm 2 V 1 s 1 and surprisingly low contact resistance of 80 Ω mm. We highlight the advantages of graphene etch masks through proof-of-concept demonstrations: Interlayer vias between devices at different depths within a heterostructure, devices with multiple active layers, and suspended graphene mechanical resonators with a dry, one-step etching process. Combined, the graphene etch mask is a versatile new nanofabrication process enabling 3D-integrated nanoelectronic and nanoelectromechanical devices from 2D material heterostructures, while simultaneously being atomically precise, scalable, simple to execute, and having performance at or exceeding the state of the art. S41-1 p-n Heterojunction of Rh 2 O 3 -decorated WO 3 Nanorods for Enhanced Selectivity toward Volatile Organic Compounds Rh 2 O 3 나노라드의 p-n 이종접합을이용한휘발성유기화합물에선택적인가스센서 한국세라믹학회 87

98 2018 년한국세라믹학회춘계연구발표회 송영근 1,2*, 이승엽 1,2, 강종윤 2. 1 고려대학교, 2 한국과학기술연구원 Indoor air quality closely related to the healthcare because human activities mainly conducted indoor, and many kinds of volatile organic compounds (VOCs) are emitted from various objects present inside the building. To detect these harmful gases, there are many attempts to distinguish the VOCs using semiconducting gas sensors such as morphological control of nanostructures, metal doping or decoration and formation of heterojunctions. Despite the extensive efforts, it is difficult to distinguish the VOCs due to their high reactivity and similar components. In particular, although acetone and ethanol are the most used in the industry, there is still a limit to distinguish between them. In this study, we reported highly sensitive and selective VOCs gas sensors based on p-n heterojunctions using vertically ordered WO 3 nanorods decorated with Rh 2 O 3 fabricated by glancing angle deposition (GLAD). The investigation of the Rh 2 O 3 decorated WO 3 nanorods was characterized using scanning electron microscopy (SEM, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The gas sensing properties were measured and the selectivity of the decorated nanorods investigated using principal component analysis (PCA) based on the collection of sensor response to various gases. We believe that the decoration of n-type WO 3 nanrods with a p-type Rh 2 O 3 is an effective method to fabricate highly sensitive and selective gas sensors for acetone detection. S41-2 Hydrogen Gas Detection of Gold Nanoparticles on Self- Activated Graphene Layers 골드나노파티클 / 자가활성그래핀층구조의수소감지특성연구김연후 *, 장호원. 서울대학교 Gold as bulk metal is well known for the least active towards atoms and molecules. On the other hand, gold nanoparticles smaller than 10 nm have exhibited great potential for various research fields such as selective oxidation and hydrogenation by the gold catalytic effect. Also, gold nanoparticles supported on metal oxide have shown great potential for chemisorption of hydrogen molecules in recent studies. Graphene is a two-dimensional material which has attracted significant research interest owing to its remarkable properties such as tremendous thermal and electrical conductivity, flexibility, transparency, and atomically thin structure. Due to these remarkable merits, studies on graphene for varied applications have become active from few years ago. Furthermore, gas molecules are easily adsorbed on graphene. In this work, we report hydrogen gas detection of gold nanoparticles on graphene layers which are self-activated. Since graphene is a 2-D material, sensing area and electrodes composed of graphene can be defined by facile lithography processes. Gold nanoparticles are deposited by e-beam evaporator. The responses of the gas sensor to various gases have been measured with varying input bias voltages at room temperature. Our results show hydrogen gas detection of gold nanoparticles supported on graphene layers at room temperature. Also, the results open a potential of noble metal/graphene heterostructures for further studies. S41-3 SnS 2 -coated SiO 2 Nanorods for Highly Sensitive NO 2 Sensor at Room Temperature with Excellent Recovery 주석이황화물나노구조체를이용한고회복성상온구동가스센서제작서준민 1*, 권기창 1, 최경순 2, 홍승표 1, 이태형 1, 홍구택 1, 송영근 3,4, 심영석 4, 장호원 1. 1 서울대학교, 2 한국기초과학지원연구원, 3 고려대학교, 4 한국과학기술연구원 Tin disulfide (SnS 2 ) have recently been attracting a great amount of attention due to its relatively larger electronegativity which can possibly be beneficial for enhancing gas adsorption sites. Even though tin (Sn) is not one of transition metals, SnS 2 has a 2D structure just like TMDs with high surface-to-volume ratio. In addition, an excessive sulfur component during synthesis procedure can manipulate the majority charge carrier of SnS 2 to be holes. Since p-type semiconductors are reported to be suitable for designing high performance gas sensors with rapid recovery kinetics due to their distinctive oxygen adsorption, better recovery can be expected from p-type SnS 2. Herein, we report highly sensitive NO 2 sensors operating at room temperature with excellent recovery using SnS 2 -coated SiO 2 nanorods. We deposited 500 nm of SiO 2 nanorods by glancing angle deposition method using e-beam evaporator. The precursor solution for SnS 2 was spin-coated on the SiO 2 nanorods and chemical vapor deposition was conducted. Uniformly coated SnS 2 on SiO 2 nanorods showed 700% response to 10 ppm NO 2 at room temperature with detection limit of ppb. The promising gas sensing properties can be attributed to dramatically increased surface area of SnS 2 for interaction with gas molecules and p-type nature of SnS 2. S41-4 Design of Ultrasensitive and Highly Selective Methylbenzene Sensors using MOF-derived Hollow Hierarchical Co 3 O 4 Nanocages MOF구조기반 Co 3 O 4 중공계층구조를이용한초고감도고선택성메틸벤젠가스센서설계조영무 1*, 김태형 1, 이철순 1, 임겨레 1, 나찬웅 2, 이종흔 1. 1 고려대학교, 2 한국생산기술연구원 4가지크기 (~0.3, 1.0, 2.0, 4.0 μm) 의단분산 Co 기반 ZIF-67 (Zeolitiv imidazolate framework-67) 를합성하고, 이를 template를이용하여크기가다른 Co 3 O 4 중공계층구조를합성한후, 이들의가스감응특성을평가했다. ~1.0 μm 크기의 Co 3 O 4 중공계층구조의경우 5 ppm의자일렌, 톨루엔가스에대해매우높은감도 ( 저항비 = 78.6, 43.8) 를나타내었고, 주요방해가스인에탄올, 벤젠, 포름알데히드, 일산화탄소에대비해서매우높은선택성을보였다. Co 3 O 4 중공계층구조의메틸벤젠에대한고감도및고선택적가스감응특성은 Co 3 O 4 의촉매활성뿐만아니라, 껍질의얇은계층구조을통한입자내부로의가스접근성, 풍부한메조기공, 및높은비표면적에서기인한다. 입자의크기, 껍질의두께, 메조기공, 및중공계층구조는가스감응특성을결정하는매우중요한요소인데, 이는 ZIF-67 의침전과수열합성방법의적절한조절을통해쉽게제어할수있었다. ZIF-67을기반으로한 Co 3 O 4 중공계층구조의합성은실내공기질모니터링을위한고성능메틸벤젠센서를설계하는효과적인방법을제시한다. S41-5 Suspended Metal-oxide Nanowire based Gas Sensors Fabricated at a Wafer Level 88 한국세라믹학회

99 구두발표 웨이퍼단위일괄공정으로생산된공중부유형산화물나노와이어기반가스센서신흥주 *. 울산과학기술원 (UNIST) Metal oxide nanowires have been widely utilized as a gas sensor material because of their large surface-to-volume ratios facilitating effective gas accessibility and fast response. The gas sensor performance can be enhanced by positioning nanostructures in the form of suspended architecture. We developed a simple batch process implementing suspended single carbon nanowire sensor platform using carbon-mems technology. Various metal oxide nanostructures such as ZnO nanowires and CuO nanoflakes could be selectively grown on the suspended sensor platform using successive batch processes. In this talk, we introduce the effect of the suspended architecture and circumferentially distributed nanostructures on the sensing performance. In addition, by adding a single insulation layer, the carbon nanowire could work as a heater enabling gas sensing with ultralow power consumption. At the meeting, we will report the preliminary gas sensing results collected from the nano-heaterintegrated suspended metal-oxide nanowire based gas sensor. S41-6 P-typed Metal Oxide Nanomaterials for ppb-level Formaldehyde Gas Sensors ppb 수준의포름알데히드감지를위한 P형나노금속산화물가스센서이대식 *. 한국전자통신연구원 To enhance the gas-sensing performance of metal oxide gas sensors, development of the sensing materials, especially nanomaterials, are known to be one of most important solutions. P-type nanomaterials look promising due to their merits like wide dynamic range, good sensitivity, and rapid recovery kinetics. Thus, this paper present some nanomaterials-based gas sensors, that had been recently published, prepared by controlling the materials (CuO, Co 3 O 4, ZnCoO), the shapes, the sizes, morphology, surface area, crystallography, etc. As for target application of the gas-sensing nanomaterials, formaldehyde, one of the well-known detrimental air pollutants causing sick house syndrome and requiring to monitor in sub-ppm levels, is chosen. The sensors could detect the gas from the 10 ppb level to 1000 ppb, linearly. S41-7 High Performance Metal Oxide Semiconductor Gas Sensors Based on Nanocolumnar Structure 나노주상구조기반고성능금속산화물반도체가스센서강종윤 *. 한국과학기술연구원 Monitoring the deleterious gases presented in breath or indoor has become a promising candidate as a suitable approach for healthcare. To detect the harmful gases, extensive efforts are conducted by nanostructures with metal additives or hetero-junctions on the basis of three basic factors (transducer function, utility factor and receptor function). Generally, porous nanostructures as a sensing material are synthesized by solution or chemical based methods, but have limitations such as uniformity, productivity and reproducibility in practical application. In order to overcome these drawbacks, we studied the synthesis of nanostructures without nano-template or chemical additives based on glancing angle deposition (GLAD) method via e-beam evaporator. By controlling the incident angle of vapor flux, orientation of the substrate, vacuum level, deposition rate and size of electrodes, morphological and electrical properties are effectively tailored. In addition, metal oxide based room temperature gas sensors are investigated using OH-functionalized SnO 2 nanorods in humidity to reduce the power consumption. We believe that our effective method to fabricate highly sensitive and selective gas sensors stands as a competitive candidate for practical application. S41-8 Metal-Organic Framework on Pd Nanowires for Ultra- Fast Responding and Recovering Hydrogen Sensors 금속유기구조체의여과효과를이용한팔라듐나노와이어기반초고속수소센서개발구원태 1*, Shaopeng Qiao 2, Alana F. Ogata 2, Gaurav Jha 2, 장지수 1, Vivian T. Chen 2, 김일두 1, Reginald M. Penner 2. 1 KAIST, 2 University of California, Irvine Hydrogen (H 2 ) has been regarded as a next-generation energy source due to its abundance in nature and high efficiency in energy combustion. However, H 2 easily reacts with oxygen molecules (O 2 ) in air, which substantially causes a risk of flammability. Therefore, the development of high performance H 2 gas sensors with fast response and recovery time is necessary. In particular, palladium (Pd) metal is a representative H 2 sensing material, but its H 2 sensing properties are easily degraded by O 2 in air. To overcome these limitations, we report on the critical role of metal-organic framework (MOF), assembled on Pd nanowires (NWs), for ultra-fast H 2 sensors. As a protective H 2 filtration-layer, Zn based zeolite imidazole framework (ZIF-8) was directly assembled on lithographically patterned Pd NWs, which lead to the formation of Pd NWs/ZIF-8 based H 2 sensors. The ZIF-8 membrane consisted of a lot of micropores (0.34 nm for gas diffusion) allows the high penetration of H 2 (kinetic diameter = nm), while O 2 (0.345 nm) in air are diffused slowly in ZIF-8 layer, resulting in ultra-fast H 2 sensing properties. Very importantly, the Pd NWs covered by ZIF-8 layer (Pd NWs@ZIF-8) showed dramatically improved H 2 sensing speed (7 s for response and 10 s for recovery to 1% of H 2 ) to low concentration range of H 2 at room temperature in air, compared with pure Pd NWs based H 2 sensors (164 s for response and 229 s for recovery). Although the H 2 response (3.47% to 1%) of Pd NWs@ZIF-8 was slightly decreased compared with pure Pd NWs (5.88% to 1%), the Pd NWs@ZIF-8 showed 20-fold faster recovery and response speed than pristine Pd NWs. S41-9 Case Studies for Medical Applications based on Chemical Sensors Array 화학센서어레이기반의료응용의사례변형기 *. 강원대학교 Gas/Odor sensing system based on an array of chemical sensors together with associate electronics that display broad specificity and high sensitivity to odorous chemicals has been implemented as so called electronic nose. The human sense of smell is perhaps the most interesting and yet is understood the least. There is considerable need for an instrument that could mimic the human sense of smell and to be used extensive range of applications. These range of applications are from food and medical to environmental monitoring and process control. In presentation, we particularly focus to introduce two case studies for medical applications such as wound and lung diseases 한국세라믹학회 89

100 2018 년한국세라믹학회춘계연구발표회 monitoring based on chemical sensors array as an intelligent sensor system for non-invasive health care monitoring, which were developed in our and collaborated laboratories. Chemical sensing system has been used to measure both simple and complex gases/ odors in many fields of application to date. In conclusion, we emphasis the chemical sensing system is capable to use the variety of applications combined with the suitable functional materials. S41-10 High Hydrogen Gas Sensing Performances by Utilizing Noble Paladium 팔라듐기반고감도수소센서제작정건영 *. 광주과학기술원 (GIST) 나노프린팅을이용하여 PET 유연기판위폴리머박막에금속을직접전사하여팔라듐나노리본어레이를형성하였음. 각각의나노리본사이는 130 nm 정도의갭이있어서수소가스가팔라듐나노리본에흡착이되면팔라듐나노리본이부피팽창하면서갭이닫히고, 수소가탈착되면다시나노갭이생성이된다. 이특성을이용하여수소가스누출을전기적신호로감지하는센서를제작하였다. 나노갭이닫힘과동시에전류가순간적으로증가하고수소탈착과동시에전류는즉각감소한다. 두콘택전극의간격이 200 μm인팔라듐나노갭기반수소센서는 3% 수소농도에서 ~10 9 % 감도를보이고 1.2 μw 낮은전력으로구동하여향후스마트폰에도적용가능성을보여주었다. 또한, 수초의빠른반응과회복속도특성을보이고 6개월동안동작특성에변함이없음도확인하였다. IGZO 세라믹반도체를이용한수소가스센서를제작하였음. 수소를잘흡착하는팔라디움금속촉매막을 IGZO 박막위얇게 (1 nm, 3 nm, 5 nm) 증착하여두께에따른수소가스센서동작을비교하였다. 기저전류는팔라디움두께에비례하여증가하며, 1 nm 팔라디움촉매를쓴경우상온에서 5% 수소농도에서 % 의높은감도를보여주었다. 또한, 0.01% (100 ppm) 수소농도에서도 ~10 4 % 의높은감도를나타내었음. 수백 ms의반응속도및 30s의회복속도를보여줌. S41-11 Metal Organic Framework Templated Gas Sensors 금속유기구조체기반가스센서김일두 *. KAIST 금속유기구조체 (Metal Organic Framework, MOF) 는금속이온과유기물리간드가서로정열되어형성된다공성구조체로높은비표면적과미세기공구조를갖는특징이있다. MOF는구조적특징으로인해 CO 2 capture, 촉매, molecular sieving layer 등에널리응용되고있으며, 최근들어가스센서소재로도큰주목을받고있다. 본초청강연에서는 MOF 소재를이용한최신가스센서연구동향과, MOF의탄화및산화과정을통해제조된다공성소재를활용한유해가스검출센서기술에대해소개하고자한다. S41-12 Gas Sensing Properties of Metal@MOS (Metal Oxide Semiconductor) Core-shell Structured Nanoparticles Metal@MOS (metal oxide semiconductor) 코어-쉘구조나노입자의가스감지특성유연태 *. 전북대학교 The metal oxide semiconductors (MOSs) are known as chemiresistors, and now extensively used for monitoring several kinds of inflammable and toxic gases. In order to increase the sensing properties, loading noble metal onto the MOSs surface has been recognized as a smart method because these noble metal catalysts act as receptors for the target gas molecules. However, the practice of surface functionalization of noble metals onto the MOSs is limited at high temperature condition due to coagulation and sintering. To overcome this drawback a new strategy of core-shell heteronanostructure has been exploited for gas sensors in which noble metals are introduced as cores and oxide semiconductors acted as shells. Due to this core-shell hetero-structure the core is isolated from the shell and prevents it from migration and sintering at harsh conditions. In this study, two different types of metal@mos coreshell structure nanoparticles (NPs), metal@n-mos (n-type semiconductor shell) and metal@p-mos (p-type semiconductor shell), are introduced, and their gas sensing properties and mechanism are discussed. In addition, the gas sensing behavior of p-mos@n-mos core-shell structured NPs is also compared with that of metal@mos core-shell NPs. S41-13 Microwave-based Synthesis of Graphene/Metal Oxides Nanocomposite Materials for Gas Sensing 마이크로웨이브합성법에의한그래핀 / 금속산화물나노복합체의합성과고성능가스센싱특성김현우 *, 최명식, 방재훈, 엄완식. 한양대학교나노소재는벌크소재와는차별화되는유용하고다영한물성을가지고있어최근각종센서로사용하기위하여활발히연구하고있다. 특히금속산화물반도체는냄새물질에대한감응특성이우수하고비교적광범위의온도영역에서작동이가능하다. 한편센서의민감도는센서물질의크기가감소함에따라증가하는데나노소재의경우는비표면적이커서센서반응이활성화될뿐아니라크기가작아전류의흐름에대한저항의변화폭이커지게되어감도의획기적인제고가가능하다. 또한나노복합체는각소재의장점의시너지효과를나타낼뿐만아니라 heterointerfaecs의형성으로주센싱소재의초기 conduction volume감소와 energy barrier의작용으로감도의가일층향상을도모할수있다. 본발표에서는미래센서기술의발전방향중하나인나노물질과복합체적용을위하여마이크로웨이브합성법을적용하였고이생산물에대하여 NO 2 가스센싱특성을연구하였다. S41-14 Gas Sensor Array based on 2-Dimensional Materials 2차원소재기반가스센서어레이장호원 *. 서울대학교 Nanostructuring, heterostructuring and surface decoration are powerful methods to enhance chemoresistive gas sensing properties of 2-dimensional materials such as graphene and MoS 2. Here we introduce various approaches to significantly promote gas sensing performance of 2-dimensional materials. Strategies to realize room temperature or heater-less gas sensor array based on 2-dimensional materials for the Internet of Things are prenseded with emphasizing that lower power consumption with faster response and recovery speed, reproducible fabrication process, and long-term stability are critical. S42-1 Chiral Atomically Thin Films 카이랄원자단위로얇은박막김철주 *. POSTECT ( 포항공과대학교 ) 90 한국세라믹학회

101 구두발표 Here, we present a novel approach for programming optical properties of atomically thin films, namely chiral stacking, where atomically thin crystalline films are stacked one-by-one with precise control of the interlayer rotation (θ) and polarity. Based on the approach, we produced chiral bilayer graphene film, which has left- and righthanded counter parts, connected by mirror symmetry. The film displays one of the highest intrinsic ellipticity values (6.5 deg μm 1 ) ever reported, and a remarkably strong circular dichroism (CD) with the peak energy and sign tuned by θ and polarity. We show that these chiral properties originate from the large in-plane magnetic moment associated with the interlayer optical transition. Furthermore, we show that we can program the chiral properties of atomically thin films layer-by-layer by producing three-layer graphene films with structurally controlled CD spectra. Our fabrication process and tunable chiral properties can be extended from graphene to other twodimensional layered materials to form chiral atomically thin films. This would allow the realization of chiral properties with diverse electrical and optical features. S42-2 Emulation of Synapse Using Vertical Floating Gate Memristor TRAM 플로팅게이트멤리스터 "TRAM" 을이용한시냅스모방소자유우종 *. 성균관대학교 The human cognitive ability consumes several tens of times less power than the latest supercomputer, but the recognition speed and accuracy are much higher. Recently, IBM has developed visual cognitive system TrueNorth by integrating a 256 million SRAM synaptors. It successfully recognized multi-object using very low power of 72 mw, which is 176,000 times less than that of an optimized simulator based on von Neumann architecture. However, SRAM synapstor require a large number of transistors (42 transistors for 7bits of SRAMs) to represent a single synapse in a brain cell. In order to solve this problem, researches using an analog memory device memristor, such as RRAM (Resistive Random-Access Memory) and PRAM (Phase-change Random-Access Memory), are being actively carried out. A memristor is an electronic device that consists of two terminals and an electrical channel, the resistance of which can be tuned in an analogue manner along the numbers of applied pulsed voltages. As a result, the device has a memorized resistance and could represent a single synapse by single memristor.. However, very low reliability of these memristors is the bottleneck for practical applications. On the other hand, flash memory, which is a memory using a floating gate charge and discharge, has excellent advantages such as data storage of more than 10 years and over 1,000,000 charge/ discharge cycles. In particular, the reliability of the circuit is close to 100%, resulting in flash memory to be a major storage device for modern smart phones and computers. However, three-terminal (source, drain, and gate) operation of the flash memory limits the emulation to a synapse device operating as two electrodes of source and drain. Recently, we have fabricated a tunneling memristor or TRAM (tunneling random access memory) which is a flash memory that can operate with two electrodes of source and drain 1,2. TRAM showed high reliability and 1000 times higher on/off state than conventional RRAM and PRAM. This has laid the foundation for innovative technology that will change the global artificial intelligence technology roadmap by opening up the possibility of adopting the memristor of reliable flash memory. 1. Quoc, A.V. et al. Nature Communications 7, (2016). 2. Quoc, A.V. et al. Adv. Mater (2017). S42-3 Enhanced Performance of Flexible Transistors with 2D Material Hyuk-Jun Kwon *. Daegu Gyeongbuk Institute of Science and Technology (DGIST) Flexible/wearable electronics are envisioned as a future platform of electronics integrated into a variety of emerging technologies from sensing and monitoring to human-inspired applications. However, typical soft materials have a low thermal budget. Unlike conventional process, a pulsed laser with high energy density leads to the thermal effect in locally confined area where requires high temperature without extreme thermal damage. I demonstrate that flexible multilayered MoS 2 thin-film transistors (TFTs) in which the electrodes are selectively annealed using picosecond laser achieve the enhancement of device performance without plastic deformation. Numerical thermal simulation for the temperature distribution, transmission electron microscopy (TEM) analysis, current-voltage measurements, and contact-free mobility extracted from the Y-function method (YFM) enable understanding of the compatibility and the effects of pulsed laser annealing process. These various outcomes indicate that the site selective pulsed laser process can open up next-generation technologies and leading the paradigm shift of the electronic applications. S42-4 Defects E n gineering of Transition Metal Dichalcogenides via Covalent and Non-covalent Approaches 공유및비공유결합을이용한전이금속다이찰코게나이드의결함엔지니어링박준홍 1*, Andrew C. Kummel 2. 1 기초과학연구원 (IBS), 2 University of California, San Diego Layered transition metal dichalcogenides (TMDs) have been considered as next generation semiconductor platforms because their atomically thin body allows enhanced electrostatic gate control and atomically scaled precision thickness control of the channel. However, integration of TMDs into the logic transistors has been limited due to a lack of effective defects engineering in TMDs. At first, the formation of an organic/inorganic van-der-waals interface between a monolayer (ML) of titanyl phthalocyanine (TiOPc) and a ML of MoS 2 is investigated as a defect passivation method. A strong negative charge transfer from MoS 2 to TiOPc molecules is observed in scanning tunneling microscopy. As a result of a formation of the van-der-waals interface, the I ON /I OFF in backgated MoS 2 transistors increases by more than two orders of magnitude, while degradation in the photoluminescence signal is suppressed. Conversely, the defects engineering via chemical treatments can be employed in TMDs to improve the electronic properties of FETs. The chemical treatment involves dipping process with a single layer of WSe 2 in (NH 4 ) 2 S in ambient conditions. After chemical treatments, new engineered defects are observed with large population of positive 한국세라믹학회 91

102 2018 년한국세라믹학회춘계연구발표회 charge carriers. As a result of the formation of defects, the ON current of the single layer WSe 2 FETs increases more than two orders of magnitudes. S42-5 Solution Processing of High-Performance and Scalable Metal-Chalcogenide Semiconductors 고성능금속칼코센화물반도체의용액공정김명길 1*, 박성규 1, Tobin J. Marks 2. 1 중앙대학교, 2 Northwestern University In modern daily life, the large area display have been the major information delivery media for internet and broadcasting. Furthermore, as represented by the recent development of high performance thin-film solar cell, ubiquitous sensor array for personal health care, and internet of things, the emerging large area electronics applications requires development of high performance semiconducting materials for emerging applications. Metal chalcogenide have been known as promising materials for electronics and solar cell applications. Although there have been limited success of solution processing of metal chalcogenides, The general strategy for obtaining high-quality, large-area metal chalcogenide semiconductor films from soluble precursors is still under development. In this talk, I will present the recent development of high performance metal chalcogenide semiconductors with soluble molecular precursor and nanomaterials. The optimized TFT device could exhibit a maximum field-effect mobility greater than 300 cm 2 V 1 s 1 with an on/off current ratio of > 10 7 and a good operational stability (threshold voltage shift < 0.5 V at positive gate-bias stress of 10 ks). In addition, metal-chalcogenidebased seven-stage ring oscillators operating at an operating speed of ~2.6 MHz (propagation delay of < 27 ns/stage) was demonstrated. S43-1 Development of Energy Storage Media Using Hybrid Materials based on the Carbon Nanostructures 탄소나노구조체기반하이브리드소재를이용한에너지저장소재개발이정우 *. 부산대학교 Recently, 1D carbon nanostructures, including carbon nanotubes and graphene nanoribbons have exhibited their remarkable physicochemical properties with conspicuous aspect ratios. Also, 2D and 3D graphene materials extended their potentials in a variety of fields. Furthermore, the unique features of zero-dimensional nanoparticles (NPs) have been intriguing in state-of-the-art research topics. In addition, the new functional materials hybridized with different dimensionalities such as 0D NPs and 1D-3D carbon nanostructures have been demonstrated to result in their synergic performance for promising applications. However, practical fabrication of the hybrid, and also understanding of interaction between nanoparticles and carbon nanostructures are still challenging. Here, we present the facile route of development on the energy storage media using hybrid materials based on the carbon nanostructures. S43-2 Enhanced the Piezoelectric of Polyvinylidene Fluoride (PVDF) Polymer by Combining Flexoelectric Properties of LDHs Nanosheet LDH 나노시트의플렉소특성융합을통한 PVDF 고분자압전특성향상연구 뉴엔띠민뜨위 *, 윤순길. 충남대학교 The structure of Zn:Al Layer-double hydroxides nanosheet (Zn:Al LDHs) is a center-symmetric structure. Therefore, Zn:Al LDH has flexoelectric property. This study proposes a methodology for enhancing the out power of PVDF based piezoelectric nanogenerators (PENGs) by combining the piezoelectric property of PVDF and flexoelectric property of Zn:Al LDHs, respectively. Firstly, AZO is used the precursor material to grow Zn:Al LDHs. Zn:Al LDH nanosheet grown on AZO/Ag/AZO/PES multilayer, PVDF powder is dispersed into Dimethylformamide (DMF) and Tetrahydrofuran (THF) solutions as solvents to form a sol solution. Secondly, the sol solution is deposited on LDH nanosheet /Ag/AZO/PES substrate by the spin-coating method. The final annealing process to change form α-phase PVDF to β-phase PVDF has piezoelectric property. PVDF based nanogenerators produce an output voltage of 0.85 V and a current density of 0.4 μa/cm 2. After combining, nanogenerator exhibited high output voltage and current density up to 3.25 V and 2.67 μa/cm 2, respectively. This approach enhanced the performance limits of PVDF-based PENGs. S43-3 Arsenic Removal by Synthesis of PS@+rGO@GO@Fe 3 O 4 Hybrid Composite Polystyrene@+rGO@GO@Fe 3 O 4 하이브리드복합체합성을통한비소제거및특성분석백병민 1*, 임병석 2, 강봉균 2, 양우석 1, 윤대호 2. 1 전자부품연구원, 2 성균관대학교 The PS@+rGO@GO@Fe 3 O 4 (PG-Fe 3 O 4 ) hybrid composites for Arsenic removal were successfully fabricated and well dispersed using layer-by-layer assembly and a hydrothermal method. The PG- Fe 3 O 4 hybrid composites were composed of uniformly coated Fe 3 O 4 nanoparticles on graphene oxide layers with water flow space between 3D structures providing many contact area and adsorption sites for Arsenic adsorption. The PG-Fe 3 O 4 hybrid composite has large surface adsorption sites and exhibits high adsorption capacities of 104 mg/g for As (III) and 68 mg/g for As (V) at 25 C and ph 7 comparison with pure Fe 3 O 4 and P-Fe 3 O 4 samples. S43-4 Ultra-rapid and Etching-free Multiscale Patterning at Room Temperature via Plastic Deformation 소성변형에의한초고속탈식각다중스케일상온패터닝공정박운익 *. 한국세라믹기술원 To realize a multiscale (nanoscale-microscale-miliscale) direct pattern formation with functionalities, a novel and practical etching-free patterning technology based on various lithography technologies such as a photolithography, nanoimprint, nanopattern transfer printing, and self-assembly of block copolymer will be introduced in this talk. The multiscale patterning enables an ultrafast pattern formation of various shapes of structures (dot, line, hole, mesh, and ring) with a range of 10 nm to 100 µm by mechanical deformation at an extremely high pressure without any etching process. Diverse materials such as polymers, metals, oxides, and hybrid materials can be easily patterned for a short processing time (< 30 sec) using the plastic deformation patterning process. Simulation results strongly support how the most materials can be multiscale-patterned at an extremely high pressures and a very short processing time. 92 한국세라믹학회

103 구두발표 S43-5 Magnetoelectric Composite with Piezoelectric and Magnetostrictive Materials for Magnetic Energy Harvesting 류정호 1*, 김광호 2. 1 영남대학교, 2 부산대학교 The needs of the Internet of Things (IoT) and the advent of low-power consumption electronic modules are moving energy harvesting systems, so called as standalone powering devices from niche applications to broad-scale practicality. These devices are expected to play a crucial role in the development of next-generation wireless sensor networks (WSN). In contrast to typical magnetic energy generators that use electromagnetic induction, which are bulky and have low generation efficiency under small magnetic fields at low frequency, magneto-mechano-electric (MME) generators utilizing the magnetoelectric (ME) coupling effect and magnetic interactions are considered emerging candidates for a ubiquitous autonomous energy source that can convert stray magnetic noise to electric energy for applications in WSN and low-power-consuming electronics. The key component in an MME generator is the ME composite consisting of piezoelectric and magnetostrictive materials, which elastically couples the electric and magnetic behavior of respective constituent. Here, we report an MME generator consisting of crystallographically controlled piezoelectric single crystal macro-fibre composite and a highly textured Fe-Ga alloy, which exhibits an exceptionally high output power density of 3.22 mwcm 3. The large energy generation in this structure is ascribed to the coupling between the strong anisotropic properties of piezoelectric single crystal fibres and textured Fe-Ga magnetostrictive alloy. S43-6 High-performance Flexible Lead-free CH 3 NH 3 SnI 3 /PVDF Bilayer Piezoelectric Energy Harvester 고성능무연 CH 3 NH 3 SnI 3 /PVDF 이중층압전에너지하베스터 IPPILI SWATHI *, 윤순길. 충남대학교 Energy harvesting is the process of extracting small amount of energy from ambient environment conditions through various sources of energy like light, thermal sources and mechanical sources. In recent years, Piezoelectric energy harvesters and piezoelectric materials have attracted increasing attention as active material in piezoelectric devices to power wearable and portable power commercial lightemitting diodes (LEDs), microelectromechanical systems (MEMS), implantable biosensors, ultralow power wireless electronics, remote and mobile sensors and even portable/wearable personal electronics. Organic-inorganic lead halide perovskite materials have been widely studied for solar cell, LEDs and photo detectors. Recently, few researchers have been investigated the piezoelectric properties of perovskite materials since these have a perovskite structure which can lead to ferroelectric polarizations like other types of materials with the same structural characteristics. But the toxicity of lead-based materials remains major concern for energy harvesting. Therefore, it is highly desirable for lead to be replaced with other nontoxic elements. Among the lead-free perovskite materials for solar cell application reported to date tin based perovskite materials are most promising alternatives. These materials have brittle nature as the conventional piezoelectric materials which limit the fabrication of flexible energy harvesters. In this work, we present a high-performance bilayer piezoelectric generator based on the lead-free CH 3 NH 3 SnI 3 perovskite and PVDF thin films. CH 3 NH 3 SnI 3 perovskite thin films were prepared by simple spray process technique. The Polarization-Electric field (P-E) hysteresis loop and dielectric constant of the prepared films were investigated and confirms ferroelectric nature of CH 3 NH 3 SnI 3 perovskite films. Therefore, MASnI 3 perovskite can potentially be adopted for realizing hybrid energy harvesting devices and to demonstrate the performance of piezoelectric generators. And then we investigated PVDF/CH 3 NH 3 SnI 3 bilayer effect on the output performance of lead-free CH 3 NH 3 SnI 3 piezoelectric generators. S43-7 Piezoelectric BaTiO 3 Nanoparticles Vertical-aligned and Phase-transformed by Electric Field 전기장에의한수직정렬및상변이의압전성 BaTiO 3 나노입자윤제문 1*, 신정호 2, 김광호 3. 1 ( 재 ) 하이브리드인터페이스기반미래소재연구단, 2 한국원자력연구원, 3 부산대학교 Well-aligned nanoparticles have merits for unidirectional loading and energy concentration compared to randomly dispersed particles that cause energy scattering. Because the well-aligned nanoparticles are unidirectional and close to each other, stress-induced energy can be created even by a small stimulus due to the stress-sensitive geometric structure. Here, we present a facile electrical orientation method to obtain vertically aligned BaTiO 3 nanoparticle arrays in a polymer matrix for the improved piezoelectric power generation. Compared with the randomly dispersed nanoparticle composite, the vertically aligned BaTiO 3 array film has excellent electrical output performance (ca. 3 V and 650 na) and more than twice the transparency because of reducing light scattering by gathering BaTiO 3 nanoparticles. In addition to the improved piezoelectric performance and transparency due to the alignment of the nanoparticles, we found that the (200) diffraction plane of BaTiO 3 is transformed by an electric field. Furthermore, it is demonstrated that electric charge generated by a mechanical micro-loading of 4 μm denting depth using a nanoindenter equipment can pass through the polymer insulating layer in the wellaligned composite system but not the dispersed system. S43-8 Bi-finctional Catalyst for Cellulose Conversion 셀룰로오스전환생산을위한이중기능성촉매리오이룬헬레나 *. 부산대학교셀룰로오스 (Cellulose) 는 β-1,4- 글리코시드결합에의해연결된글루코오스단량체로이루어진불용성사카라이드중합체이다. 현재의연구동향은셀룰로오스를글루코오스로가수분해하는데초점을맞추고있으며, 이는셀룰로오스를대체연료로사용하기위한핵심기술이다. 셀룰로오스에서글루코오스로변환을위한전통적인공정은 HCl, H 2 SO 4 또는 HF를포함한희석시키거나농축된광물성산에의한가수분해를포함하지만, 이시스템은반응기의변성, 낮은재활용성및폐수의후처리와같은단점이있다. 효소는열안정성이낮기때문에가수분해에긴반응시간이필요하다. 따라서, 셀룰로오스가수분해를위한대체경로, 특히고체산촉매의이용이연구되고있다. 단일작용기로서단일 -SO 3 H 기를갖는통상적인고체산은촉매와셀룰로오스사이의부족한상호작용으로인해글루코오스수율이낮게나타난다. Nature (2005) 는셀룰로오스가수분해의잠재적인촉매후보로서 -SO 3 H, -COOH 및 -OH를포함하는다기능그룹의카본지지체를제안했다 (Fig. 1). 동일한그룹 (Green Chemistry, (2008)) 은또한 -SO 3 H 그룹에친수성분자 (-OH, -COOH) 가촉매부위에서셀룰로오스결합을촉진시켜결국 한국세라믹학회 93

104 2018 년한국세라믹학회춘계연구발표회 가수분해과정을가속시킨다고하는셀룰로오스가수분해의주요촉매인자를설명했다. 수십분내에묽은황산에서탄소암모니아의새로운플라즈마술폰화공정. 술폰화된탄소의총산성및 -SO 3 H 밀도는각각 4.4 mmol/g 및 2.2 mmol/g 이었다. 설폰화된탄소촉매를사용한셀룰로오스가수분해중포도당선택도는 83.9% 였고 3 회재활용후성능은 98% 를유지했다. 기존의술폰화공정에비해플라즈마공정은공격적이고유해한화학물질을사용하지않고탄소재료를설폰화할수있어탄소촉매상용화에대한환경영향및비용을크게줄이고재생에너지를위해셀룰로오스를포도당으로전환시키는것을촉진합니다. S dimensional Energy Conversion Nanostructures Fabricated Based on Metal/Polymer Interfacial Engineering 정연식 *. KAIST ( 한국과학기술원 ) This talk introduces how engineering of metal/polymer interfaces can realize the fabrication of highly uniform and reproducible 3- dimensional (3D) nano-architectures composed of high-quality polycrystalline materials. As an example, excellent catalytic activity and durability of 3D nanocatalysts for fuel cell, CO 2 conversion, and hydrogen production will be demonstrated. S43-10 Atomic Layer Deposition Processes for High Efficient Polymer-Electrolyte Membrane Fuel Cells 고분자전해질연료전지응용을위한원자층증착기술권세훈 *. 부산대학교고분자전해질연료전지는최근청정에너지원으로각광을받고있으며, 특히연료전지자동차의급격한성장과함께많은개발이이루어지고있다. 그러나, 고분자전해질연료전지의성공적인상용화를위해서는연료전지를구성하는다양한부품의성능개선과가격경쟁력확보, 그리고대량생산에적합한공정기술의개발이이루어질필요가있다. 특히, 고분자전해질연료전지를구성하는다양한부품에서고가의귀금속을다량사용하므로, 귀금속저감을이룰수있는기술의개발이현재다양한방법으로개발되어지고있다. 특히, 금속분리판과 MEA를구성하는촉매소재의개선이가장시급한데, 이는두부품에대한 DOE의특성요구스펙이매우높고, 고분자전해질연료전지전체부품에서가격비중이가장높기때문이다. 따라서, 본연구에서는화학흡착을활용하여, Pinhole과같은표면결함이최소화된고품질박막의형성이용이하고, 매우얇은두께로정밀한컨트롤이가능한원자층증착법의고분자전해질연료전지로의응용가능성을살펴보고자한다. 특히, 우수한전기적전도성, 높은내부식성, 낮은접촉저항등이필요한금속분리판용에적용을위한원자층증착방식의보호층소재와고밀도의나노금속입자증착을통해, 귀금속사용량저감이가능한유동층원자층증착법기술을중심으로살펴보고자한다. S43-11 Enhanced Output Performance of MAPbI 3 -PVDF Composite Thin Films based Flexible Piezoelectric Generator MAPbI 3 -PVDF 복합체박막기반의유연한압전발전장치특성향상 Venkatraju Jella *, 윤순길. 충남대학교 Energy harvesting from ambient environment and biological moments has received considerable attention for developing selfpowered device. Among various energy sources, mechanical energy sources (e.g., human walking, transportation movement, and even sound waves) are most promising candidate for energy generation with improved accessibility and eco-compatibility [1-3] since the first nanogenerators were demonstrated for direct energy conversion from mechanical motion to electrical power. In past decade, numerous piezoelectric generators have been constructed using various piezoelectric nanostructured materials. Recently, CH 3 NH 3 PbX 3 perovskite (X = Cl, Pb, I) attract much attention with direct band gap energy of 1.5~2 ev has shown outstanding properties as an absorber layer in perovskite solar cells with 19.3% within few years. Apart from the light harvesting, the spontaneous polarization of these perovskite materials leads to study towards piezoelectric application [4]. In addition this, MAPbI 3 thin films used as a piezoelectric generator [5]. Here we investigated flexible piezoelectric generator of MAPbI 3 - PVDF composite films. The composite films were prepared using various amounts of MAPbI 3 and PVDF by spin coating on Au/Ti coated PET substrate. As deposited thin films structure and surface morphology were characterized by XRD and SEM. The dielectric properties of prepared composite films were investigated. The piezoelectric performance of MAPbI 3 -PVDF composite films were measured for various volume ratios of MAPbI 3 and PVDF. S43-12 Electrochemical Process for Thermoelectric Materials 전기화학공정법을통한고성능후막열전제조에관한연구임재홍 *. 재료연구소 (KIMS) Electrochemical process has been attracting attentions because of its many advantages including low-cost, rapid deposition rate, and ease of control their microstructure and crystallinity by adjusting electrochemical parameters. Among many applications, electrochemical deposition techniques can be used for the generation of renewable energy sources such as thermal, hydrogen energy, etc. In this study, we investigated the optimization of high efficient thermoelectric materials. Thermoelectric compounds such as Sb 2 Te 3, Bi 2 Te 3, and Bi 2 Se 3 have been extensively studied because of their potential applicability for efficient energy harvesting and cooling devices. We synthesized nano-dots/phases precipitated thermoelectric materials, resulting that the power factor was about 60% thermoelectric performance compared to the bulk counterpart. More details will be presented. S43-13 Effects of Uniformly Dispersed Nanofillers, Particle Size and Interfacial Polarization on Dielectric Properties of Polymer Matrix Flexible Dielectric Nanocomposites 나노입자의균일한분포와파티클사이즈그리고입자간계면분극이유연한고분자나노복합재료의유전성능에미치는영향연구진영호 1*, Rosario Gerhardt 2. 1 육군사관학교, 2 Georgia Tech Polymer matrix flexible nanocomposites with effectively dispersed single phase and multi-phase nano-fillers were prepared by a simple phase separation method. The dielectric properties of nanocomposites were enhanced by improved interfacial polarization between the matrix and the fillers. Effects of the particles size and the dispersion on the dielectric properties of polymer matrix flexible nanocomposites were studied. The effects of the interaction between the dielectric fillers and the conductive fillers were also investigated. The real permittivity and the energy density of composites with single phase 94 한국세라믹학회

105 구두발표 filler showed as high as 66 and J/cm 3 respectively, due to uniformly distributed fillers. The interactions between nanoparticles were also studied by finite element analysis and compared with experimental data using a time harmonic-electric current solver in the AC/DC module of COMSOL Multiphysics 5.2. The dielectric properties of composites with mutiphase fillers were further enhanced by the interaction between the dielectric and conductive fillers. These flexible dielectric nanocomposites are considered as potential candidates for gate dielectrics, embedded capacitors, energy storage devices and electromechanical transducers. S43-14 Solution-processed High Energy and High Power Storage Nanotechnology 용액공정고출력에너지저장나노기술 Rajaram Mane *, 김광호. 부산대학교 Nanostructured thin films of metal oxides/chalcogenides with various morphologies viz., particles, wires, rods, tubes, plates etc., have been significantly envisaged in various optoelectronic devices including thin film transistors, photoelectrochemical cells, heterojection-based solid-state solar cells, polymer solar cells, gas sensors, dye-sensitized solar cells, batteries and supercapacitors etc. To suffice requirements of device, novel structures have been synthesized and successfully evaluated. Since single component metal oxide/form cannot satisfy all essential requisites for a specific optoelectronic device, so emphasis has been made to synthesize property oriented nanostructures to provide a much-needed functionality. For example when one wish to use metal chalcogenide/oxide as counter electrode like platinum, then synthesized nanostructures of NiS, CoS, FeO 3 etc., should necessarily possess catalytic properties. In this talk, the benefits of solutionprocessed metal oxide/ chalcogenides nanostructures in the areas of energy (conversion and storage), chemical sensors along with synthesis approach will be discussed. Moreover, biological applications including protective antigen detection and antibiotics in addition to gas sensors and supercapacitors will be highlighted. G5-1 Comparison on Substitution Limit of Various Divalent Ions in OCPs Synthesized by Slow and Fast Techniques 저속및고속기법으로합성된 OCP에서다양한 2가이온의대체한계비교이맘아크발 *, 김주성, 이승엽. 영남대학교 Partial substitution of calcium ions in octacalcium phosphates (OCP, Ca 8 H 2 (PO 4 ) 6 5H 2 O) is known to change the OCP phase stability and improve their biological performance. Various amount of divalent ions such as Mg 2+, Sr 2+, and Ba 2+ were introduced during the synthesis of OCPs. The substitution limit and structural change of the OCPs which were synthesized with each divalent ion were studied by the lattice parameter change and second phase formation. The lattice parameter change and second phase formation were related to the type and amount of substituted ions and synthesizing methods as well. Several differences between two OCPs synthesized by two methods could be perceived from the lattice parameter changes with divalent ion content. Unexpected results were obtained as follow; about 9.32% of Sr was possible to be incorporated while Mg could only substitute around 4.26% of the Ca in OCP. Moreover, the Sr substitution contracted the lattice parameter by Å on (100) direction instead of expanding it. G5-2 Expansion of the Inter-planar Spacing of OCP Synthesized from DCPD with Dicarboxylic Acids DCPD에서유도된층상구조 OCP의디카복실산첨가에의한층간거리증가이승엽 *, 김석영. 영남대학교 Octacalcium phosphate (OCP) mineral has a layer structure which is composed of a hydrated layer between two apatite layers. It was found that the hydrated layer can be replaced with dicarboxylic acids. Yokoi showed that addition of dicarboxylic acids causes the expansion of (100) interplanar spacing during OCP precipitation. They also showed that the expansion of interplanar spacing was dependent on the chain length of dicarboxylic acids. In the previous study, the OCP with high purity OCP and high synthesis rate was obtained from dicalcium phosphate dihydrated (DCPD) precursor. In this study, the replacement of the hydrated layers with various dicarboxylic acids while the OCP synthesis from DCPD precursor was investigated in distilled water at ph 5.0 to 5.5 and temperature 60 C to 80 C with succinic, adipic, and suberic acids. The expansion of (100) interplanar spacing was measured by low angle XRD and compared with the Yokoi s results which were prepared by conventional precipitation method. Unlike the results of Yokoi s, only partial organic acid chain replacement was observed, it is expected to due to the difference in the synthesis speed of OCP. G5-3 Bio-application of Parylene Passivation Layer Coated in situ-synthesized Cadmium Sulfide Nanowires Photosensor 파릴렌보호막이코팅된카드뮴설파이드나노선광센서의바이오응용김홍래 *, 변재철. 연세대학교 The direct in situ synthesis of cadmium sulfide (CdS) nanowires (NWs) was presented by direct synthesis of CdS NWs on the gold surface of an interdigitated electrode (IDE). In this work, we investigated the effect of a strong oxidant on the surfaces of the CdS NWs using X-ray photoelectron spectroscopy, transmission electron microscopy, and time-of-flight secondary ion mass spectrometry. We also fabricated a parylene-c film as a surface passivation layer for in situ-synthesized CdS NW photosensors and investigated the influence of the parylene-c passivation layer on the photoresponse during the coating of parylene-c under vacuum using a quartz crystal microbalance and a photoanalyzer. Finally, we used the in situ-synthesized CdS NW photosensor with the parylene-c passivation layer to detect the chemiluminescence of horseradish peroxidase and luminol and applied it to medical detection of carcinoembryonic antigen. G5-4 Ball Mill Pretreatment of Lignocellulosic Biomass for Improving Enzyme Digestibility; Current Status and Challenges 이진형 *. 한국세라믹기술원볼밀공정을이용한목질계바이오매스전처리기술은독성부산물이발생하지않고세척공정이필요없어서친환경전처리공정개발이가능하다. 본발표에서는그동안볼밀공정을이용한목질계바이오매스기술에의한바이오매스의특성변화와당화효율향상에대해소 한국세라믹학회 95

106 2018 년한국세라믹학회춘계연구발표회 개하여목질계바이오매스전처리효율향상을위한핵심공정요소를분석하고이들에의한바이오매스의특성변화및최적조건확립에관해발표하고자한다. 특히바이오에탄올및바이오부탄올생산발효공정과연계하였을때본볼밀전처리기술의장점에대해서소개하고그적용가능성을보여주기위해실제바이오매스를활용한바이오부탄올생산공정에적용한연구결과를소개한다. 마지막으로향후기술의상용화를위한문제점과이를극복하기위한방안에대한고찰을논의하고자한다. G5-5 Stabilized Multi- and Chemo-Enzymatic Systems for Biomimetic Transformation of Carbon Dioxide 생체모방형이산화탄소전환을위한안정화된멀티 / 키모효소시스템황이택 1*, 구만복 2. 1 한국세라믹기술원, 2 고려대학교 In nature, CO 2 conversion to valuable chemicals is performed by several metabolic pathways through multi-enzymatic reaction. Here, we aimed to mimic this by introducing modular/compartmentalized strategies using carbonic anhydrase (CA) and phosphoenopyruvate carboxylase (PEPCase). Multi- and chemo-enzymatic modular systems for long-term stable continuous operation was prepared by using stabilized CA and PEPCase microbeads, respectively. Each microbeads were employed within a modular enzyme reactor system to show its long-term and stable use in the continuous and/or simultaneous production of oxaloacetate (OAA) and CaCO 3. It was found that the production of OAA and CaCO 3 was stable for more than 24 h and 6 days, respectively. The step-by-step constructions of the compartmentalized CA/PEPCase microbeads are monitored with cascade enzymatic OAA production rate from CO 2 substrate. The CA/ PEPCase system is retained about 75% of the OAA production rate of free CA/PEPCase multi-enzyme/microbeads complex structure. This is the first demonstration for both repeated-batch mode and a continuous mode for CO 2 utilization and sequestration biomimetically by using stabilized multi- and chemo- enzymatic pathway found in biological system. G5-6 Comparison of Graphene and Ruthenium Oxide Modified Electrode for Photosynthetic Electron Harvesting 그래핀및산화루테늄개조전극의광합성전자추출비교홍현욱 1*, 이장미 2, 윤재형 1, 김용재 1, 김선일 1, 황성주 2, 류원형 1. 1 연세대학교, 2 이화여자대학교 Photosynthetic electrons (PEs) are produced in a thylakoid membrane by splitting water during photosynthesis. These PEs are excited by photosystem through light energy absorption and excited PEs are transferred via electron carriers in order to synthesize NADPH. Recently, many researchers are interested in PEs and its potential power of photosynthetic light energy harvesting. They have tried to extract more PEs by various methods such as chemical tethering between thylakoid and electrode, enlarged electrode area, or mediator usage. However, although previous studies have great contributions to photosynthetic energy harvesting, still those studies have limitations in that practical uses. In this study, we suggest that electrophoretically deposited nanomaterials on Au electrode can improve the PEs extraction from thylakoid. Electrodes modified by 2-dimensional nanomaterials such as graphene or ruthenium oxide have 2~4 times larger area than before and photosynthetic current were measured up to 10 times higher than Au electrode. G5-7 Preparation and Characterization of OCP/Gelatin Composite Cross-linked with HRP for Bone Tissue Engineering HRP 가교제로경화된 OCP/ 젤라틴복합체의합성및특성평가 Mertamani Riessa Nanda *, 김석영. 영남대학교 Pure octacalcium phosphate (OCP) has been suggested to be an excellent bone substitute material compared with other calcium phosphate minerals due to fast bone regeneration. Nonetheless, the difficulty in forming and the low mechanical stability in a body fluid or cell culture medium were main problems for in vitro and in vivo assessments because the OCP material cannot be applied with the high temperature treatment. In this study, the inorganic (OCP) and organic (gelatin) mixture powder was prepared to enhance the formability and the mechanically stability for composite discs. The composite powders were prepared by a co-precipitation during the OCP synthesis and the gelatin mixing after OCP synthesis. The starting material for OCP was a dicalcium phosphate dihydrate (DCPD) and the gelatin was added in the range of 0.2 to 1.0 wt%. The influence of gelatin addition on the morphology and reaction time of OCP crystals and the mechanical strength and formability of the composite powders was investigated. The addition of gelatin into OCP powder improved the mechanical strength of OCP disc samples, but the addition of a HRP (horseradish peroxidase) as a crosslinking agent into the composite samples further enhanced the mechanical strength. G5-8 TiO 2 Nanowire Chip for MALDI-TOF Analysis of Small Biomolecule 저분자량분자의 MALDI-TOF 분석을위한 TiO 2 나노선칩개발박종민 *, 변재철. 연세대학교 MALDI-TOF mass spectrometry has become a powerful analytical tool for peptide and protein analysis. MALDI-TOF MS has various advantages compared to other analytical methods including easy sample preparation, sensitive detection (< fmol), and a wide detection range up to 500 kda. However, MALDI-TOF MS has a limitation with respect to quantitative analysis as well as in analysis of low molecular weight compounds due to intense chemical noise (background) from the organic matrix that has a molecular weight of ~300 Da. In this study, we fabricated TiO 2 nanowire target chip for MALDI-TOF MS to eliminate matrix noise, and to detect small biomolecules. TiO 2 nanowires integrated MALDI sensing chips were synthesized by mild hydrothermal process called wet corrosion process. SEM and TEM measurements revealed that morphology of synthesized TiO 2 nanowires have a diameter of 30 nm, and the crystal structure was determined by XRD and Raman spectrometry. The photocatalytic activity of TiO 2 nanowire chips was tested by the degradation of methylene blue under UV irradiation. The feasibility of detecting small biomolecules by TiO 2 nanowire chip was demonstrated with peptides, amino acids and drugs. In addition, quantitative analysis of glycine, arginine, glutamic acid, proline was carried out and limit of detection was 10 pm for glycine, arginine, glutamic acid, and 100 pm for proline. 96 한국세라믹학회

107 구두발표 S51-1 3D Printing of Permittivity-graded Material using UVcured-resin/Alumina Composite Muneaki Kurimoto *. Nagoya University 3D printing (i.e. 3D additive manufacturing) is a process of joining materials, usually layer upon layer, to make objects from 3D model data. It can provide various prototypes of solid insulator and the insulators with gradient material e.g. functionally graded material. This paper investigates the feasibility of 3D printing of 2 layered permittivity-graded material with using UV-cured-resin/alumina composite material. UV-cured-resin/alumina composite was fabricated by compounding UV-cured-resin and micrometric alumina particle with particle loading of 10 vol%. The relative permittivity and dielectric loss tangent of UV-cured-resin/alumina composite were measured in comparison with unfilled UV-cured-resin. The composite was deposited layer upon layer with UV laser irradiation in the 3D additive fabrication process. The relative permittivity of UV-cured-resin/alumina composite was higher than that of unfilled UV-cured-resin, which confirmed that alumina particles was introduced to UV-cured-resin. By the 3D printer with using the composite material and unfilled resin, we fabricated the 2 layered permittivity-graded material whose shape was cylindrical insulating spacer with 30 mm thickness. We confirmed the 3D printer could produce a prototype of 2 layered permittivity-graded material using UV-cured-resin/alumina composite. S51-2 Additive Building of Mortar Backbone Structures 몰탈기반의건축구조적층기술최한신 *, 박진수. 한국생산기술연구원 Transition from More-of-Less markets to Less-of-More markets is supported by advances of disruptive manufactureing technologies and reconfiguarble-supply-chain management technologies. In the context of pervalence of cyber physical manufacturing system, additive manufacturing technology is of great impacts on idustries, economics, and societies, Traditionally, backbone structures are built via bottomup manufacturing either with pre-fabricated building blocks such as bricks or with layer- by-layer concrete casting such as climbing formwork casting. In both cases, design selection is limited by formwork design and cost. Accordingly, tool-less building of freedom backbone structures is attractive. In this regard, KITECH has been developing Concrete Direct Building (CDB) technology, which is classified into material extrusion AM. Cementitious feedstock is extruded and placed on demand. In the present study, we introduce autonomous CDB system development project. It will cover articulated gantry framework, feedstock preparation extrusion module, in-situ process diagnostics modules, slicer and g-code edition software, realtime data analysis and control, faults definition and erro-codes specification, clearing module, and activity based cost/resources estimation model. This research was supported by a grant(17audp-b )from Urban Architecture Research Program funded by Ministry of Land, Infrastructure and Transport of Korean goverment. S51-3 Ceramic 3D Printing for Catalytic Applications: Current Status and Perspectives 세라믹 3D 프린팅을이용한화학촉매연구동향및전망곽근재 *. 한국화학연구원 3D 프린팅이랑적층제조 (additive Manufacturing) 으로불리며, 디지털디자인데이터를소스로소재를적층하여 3차원물체를제조하는프로세스를말한다. 이전까지제조기술은입체형상의재료를기계가공등을통하여자르거나깎는방식의 Top-down형제조방법이었다면, 3D프린팅은이와반대로적층형태로소재의구조를만들어가는 bottom-up 형태의새로운제조방법이다. 3D 프린팅의화학촉매분야활용은주로금속과고분자가공에제한된소재의한계로인해서최근까지기초연구단계수준으로촉매지지체로사용되는세라믹들의다양한적층제조법들이개발되고나서부터최근연구가시작되었다. 화학촉매에서 bottom-up형태의 3D구조지지체가갖는장점은반응중에발생하는열이나필요한열을효율적으로제거, 공급하기위한최적의반응시스템의구조에맞춰촉매를제조할수있다는것이며, 촉매의형태에따라시스템이결정되는일이많기때문에, 화학공정에서시스템의모양에자유도를줄경우이와관련한다양한파생기술들이생길수있다. 또한화학반응에있어서효과적인물질전달이가능한촉매디자인이원천적으로가능하기때문에촉매의구조적인개선을통해촉매성능이상반응생성물을얻을수있다. 본발표에서는최근이슈가되고있는세라믹소재 3D프린팅을이용한화학촉매연구동향을살펴보고앞으로의전망을예측해보도록하겠다. S51-4 New Trial for Ceramic Additive Manufacturing based on Stereolithography 윤희숙 *. 재료연구소 Additive manufacturing (AM) technologies have attracted a lot of attentions and have advanced remarkably in the last decade. However, there are still limitations both on selecting materials and on controlling part performance. In the former case, polymers and metals are typically used as materials for AM. Development of AM technology for ceramics consequently keeps on being required. In the latter case, functionality of 3D structure was only controlled by designing 3D architectures, although we can expect much advanced functionality of 3D part by using multi-materials for AM process. To this purpose, our group has originally developed the digital light process (DLP) system, consisting of multi-film type material feeding system, 180 horizontally rotatable stereolithography module and washing module to prevent contamination between materials, for using multi-ceramic materials. We believe that this new technology may provide big turning point to overcome limitation of traditional ceramic forming process. S51-5 Making Porcelain Figures using a Binder Jetting 3D Printer 바인더젯팅방식의 3D 프린터를이용한도자기조형물제작김응수 1*, 최정훈 2, 강은태 2, 이진욱 3, 조우석 1. 1 한국세라믹기술원, 2 경상대학교, 3 고려대학교실내외장식을목적으로심미성에중심을두고제작하는 Porcelain figure 제품은다양한소비층의요구를만족시키기위해소량다품종생산하여고가에판매된다. 이러한관점에서전통세라믹분야중 3D printing 기술의우선적인활용이적합한분야이다. Porcelain 한국세라믹학회 97

108 2018 년한국세라믹학회춘계연구발표회 figure 의구조안정성을고려하여 Digital Sketch 를작성하였으며열유동해석을통해최적의기형과두께 (< 20 mm) 를결정하였다. 소결후 glass phase, quartz, mullite 등으로구성된 porcelain figure 를제작하기위해서 starting materials 로 glass bead, clay, quartz 를 34, 46, 20% 비율로건식혼합하고여기에경화과정을돕기위하여 alumina cement, sodium silicate powder 를각각 5%, 4% 씩첨가하였다. Powder shape 과 size 는 flowability, packing density, pore size 에직접적으로영향을미친다. 그러므로조성과더불어사용되는분말들의형상및물성을최적화하여야한다. 안식각실험을통해구형 glass bead 의최적입도를 86 μm 으로결정하였으며비표면적이 90 m 2 /g 인친수성 fumed silica 를 3% 첨가하여추가적으로흐름성을개선하였다. Hydrophobic fumed silica 를첨가했을때 flowability 변화가크게일어나지만수성바인더와의호환성문제로인하여실험에서배제하였다. Bar 형태의시편을이용한소결실험과유약적용성실험을통해 1100 o C 에서 1 차소결을진행하고고형분 50% 의유약을 2 번시유하여 2 차소결하는방법으로시유및열처리공정을결정하였다. 최종결과물인 porcelain figure 는 Digital Sketch 대비기형일치도는표면질감을포함한비교에서는 ~67% 로확인되었으며골격만을비교한경우 ~92% 로관찰되었다. S51-6 Advancement of 3D Printing Inorganics at Corning, Incorporated Laura B Cook *. Corning Incorporated With over 167 years of expertise Corning, Incorporated is a global leader well known for its innovative practices in materials science. Corning has specialties in glasses, glass-ceramics, ceramics, and related materials including the compositional development, forming, and processing of these materials. It is because of this rich experience and knowledge that marks Corning at the forefront for 3D printing of inorganic materials. This presentation will cover materials of interest to Corning for Additive Manufacturing forming. S51-7 Multi-material based 3D Printing Technique for Manufacturing Functionally Graded Composite Structure 다종소재기반경사기능성구조 3D 프린팅기술이윤희 *, 고영학. 고려대학교 Recently, 3D printing technique with improved capability of precisely realizing three-dimensional designed shapes using a computer has been utilized in various industrial fields. SLA (Stereo-lithography) and DLP (Digital Light Processing) technologies use a platform (stage) to create a thin layer of photo-curable materials such as photocurable resin, ceramic/resin composites, by ultra violet light, selectively cure it according to a pre-programmed design, a technique of forming a three-dimensional structures in such a manner as to continuously laminate on an z-axis. Typical SLA and DLP technologies are used for forming a single-composition structure because 3D printing is performed in a container containing a single material with uniform composition. Recently developed multi-material based 3D printing technique can produce a composite material having a stacked structure of a plurality of materials, but there is a clear interface between different materials, which may result in a drastic decrease in physical properties. Accordingly, this study relates to the development of a new concept of 3D printing technique capable of printing a shaped article having a unique graded functional structure in which the composition capable of overcoming the limit of the discontinuous interface yet continuously changes. In this study, homogeneously dispersed high-content ceramic slurry (ceramic loading 50 vol.%) is prepared by using Hydroxyapatite (HA) and β-tricalcium phosphate (β-tcp), which are biocompatible ceramic powders, and photo-curable monomers such as 1,6- Hexanediol diacrylate (HDDA), Acryloyl morpholine (ACMO) and dispersant. The prepared ceramic/polymer structure is densified by removing monomer binders and heat treatment is performed at a high temperature of 1150 o C to prepare and evaluate the final sintered body. S51-8 Fabrication and Characterization of Porous Ceramic Scaffolds using Photo-curable Ceramic Slurry 광경화성세라믹슬러리기반 3D 프린팅기술및이에의해제조된 3차원세라믹구조물이정빈 *, 맹우열, 이윤희, 고영학. 고려대학교골조직결손부위에식립되어효과적인재건을돕는생체세라믹스캐폴드는그목적에따라다양한제조방법들이개발되어있다. 그러나기존의전통적인제조방법으로는생체세라믹스캐폴드의기계적물성및생물학적특성에영향을주는기공구조를정밀하게제어하는데에는어려움이있어, 최근각광받고있는기술인 3D 프린팅법을접목하여전통적방식의한계점을극복할수있는연구가활발히진행되고있다. 이기술은기본적으로고도로정렬된기공구조는물론, 다양하고복잡한형상의구현이가능하기때문에, 이를이용해세라믹구조물을제조하고, 그특성을평가하는연구들이발표되었다. 그러나, 높은기계적강도와생체안정성등을만족시키기위해, 고함량의무기물을유기물과매우균일하게잘복합화시키며, 또한이를응용하여, 3D 프린팅법중하나인정밀도및속도등이우수한 DLP(Digital Light Processing) 법에적용가능한액체기반의광경화성세라믹소재및기공유도중합체가포함된광경화성슬러리를사용하여, 최종적으로매크로 / 마이크로기공을가지는고품질생체세라믹스캐폴드제조에관한연구는거의보고되지않았다. 이는기본적으로무기물과유기물이매우균일하게복합화되어야하며, 이렇게제조된복합물이층층이적층시키기에적절한레올로지를가지기위해, 소재들의특성분석및적절한배치를잡는것이매우중요하다. 이에본연구에서는고충진광경화성세라믹슬러리기반 3D 프린팅기술을사용하여, 고품질의생체세라믹스캐폴드를제조하고평가하였으며, 또한동결매체가포함된광경화성세라믹슬러리를사용하여세라믹구조물내에 3차원적으로연결된미크론단위의기공을가질수있는 3D 프린팅기술을소개한다. S51-9 Stereolithographic Additive Manufacturing of Ceramic Components with Functional Geometries Soshu Kirihara *. Joining and Welding Research Institute, Osaka University In stereolithographic additive manufacturing, 2D cross sectional patterns were created through photo polymerization by ultra violet laser drawing on spread resin paste including ceramic nanoparticles, and 3D composite models were sterically printed by layer lamination though chemical bonding. The stereolithography system has been developed to obtain bulky ceramic components with functionally geometric structures. An automatic collimeter was newly equipped 98 한국세라믹학회

109 구두발표 with the laser scanner to adjust beam diameter. Fine or coarse beams could realize high resolution or wide area drawings, respectively. Nanometer sized metal or ceramic particles were dispersed in to photo sensitive liquid resins from 50 to 67 % in volume fractions. The paste was spread on a glass substrate from 10 to 100 μm in layer thicknesses. An ultraviolet laser beam of 355 nm in wavelength was adjusted from 10 to 300 μm in variable diameter and scanned on the pasted resin surface. Irradiation power was changed automatically from 10 to 200 mw. The created precursors were dewaxed and sintered in an air atmosphere to obtain full ceramic components. Through the computer aided design, manufacturing and evaluation, ordered porous structures of zirconia noise suppressor, alumina electromagnetic crystals and calcium phosphate artificial bones were successfully fabricated. The microstructures of the sintered components were observed using a scanning electron microscope. Relative densities of these ceramic components were measured by the Archimedean method. S51-10 성형외과영역에서활용되는 3D 프린팅기술과재료백정환 *. 에이치성형외과외상이나선천성기형, 또는수술로인해발생하는안면골의변형및함몰은성형외과의사에게는항상새로운도전이었고, 아직까지완전히정복되지못한영역이다. Defect 또는 Deficiency 를극복하는방법은크게자가조직 (Self) 을이용한방법과타가조직 (Non-self) 로구분이되고, 타가조직에는사체조직이나동물조직또는인공보형물이쓰여왔다. 다양한 3 차원구조의결손은의사의경험과손맛에의해그형태를맞추는정도에그쳐왔고, 그렇기에활용되는재료역시제한적일수밖에없었다. 이러한상태에서등장한 3D 프린팅기술은많은가능성을보여주게되었고, 최근 4-5 년간의료영역에급속도로활용되기에이르렀다. 3D 프린팅재료의개발및각재료의특성에맞는프린팅방식의개발이현재도계속되고있으나, Bench to bed 의거리는좀처럼좁혀지지않는듯하다. 이는각영역별전문화도가심화되면서생기는현상으로실재사용자와연구 - 개발자간의간극을줄이는것이현시점에서무엇보다중요할것으로생각된다. 이에본발표에서는현재임상에서사용되어온재료에대한간단한리뷰와세라믹재료를필요로하는영역및이에필요한물성및구조에대해설명하고자한다. S51-11 치과보철학적관점에서세라믹 3D 프린팅의의미와가능성윤형인 *. 서울대학교임상치의학의다양한영역에서컴퓨터를이용한보철물의디자인과제조 ( 밀링 ) 방식이핵심공정으로자리잡은지금, 보철수복을위한주요소재에대해서밀링을대체하는 3D 프린팅에대한관심이새로이증가하고있다. 전통적제작방식이갖는단점과, 밀링방식이갖는한계를극복하기위한방법으로제시되는 3D 프린팅은특히치의학영역에서많은가능성을확인할수있다. 광경화성 acrylic resin 의경우수술용가이드 (surgical guide), 임시보철물 (provisional restoration), 최근에는의치 (denture) 까지이미적용되거나적용을앞두고있으며, 코발트 - 크롬합금의경우임플란트수복을위한구조체 (framework) 에사용되고있다. 세라믹소재는심미적치과수복에빼놓을수없는재료로서, 전통적인장석도재 (feldspathic porcelain) 와알루미나등을거쳐최근에는밀링기술의도입과함께리튬다이실리케이트 (lithium disilicate) 와지르코니아를사용한정밀한보철물제작이가능해졌 다. 하지만 3D 프린팅을이용한세라믹구조체는치과보철영역에서사용하려면아직요원한것이현실이다. 특히 3D 프린팅특성상출력방식에따른변수들을세라믹소재에적용을위해충분히고려해야한다. 최근치의학영역에서도세라믹, 특히지르코니아를사용한 3D 프린팅가능성에대해서여러연구들이발표되고있다. 주로 DLP 방식으로세라믹슬러리를 3 차원구조체로출력하여탈지및최종소결하는방식을사용하는것이특징이다. 분명지르코니아의 3D 프린팅을사용한치과보철물제작이가까운시일안에상용화될것으로예상할수있다. 최근치과용세라믹소재의연구경향은단일구조 (monolithic) 형태와혼합구조체 (hybrid network) 형태의적용의두가지로나뉜다. 이른바혼합세라믹 (hybrid ceramic) 재료는자연치의물성에가깝게하기위한노력의일환으로개발되었으며, 단일구조 (monolithic) 세라믹소재는구조적장점을기반으로자연치와가까운광학적특성을부여하고자개발되었다. 향후세라믹 3D 프린팅공정에재료에대한임상적요구사항이반영된다면복잡한형상의치과용보철물을자연치아와유사한물성을갖는세라믹기반소재로출력하여치료하는방식도가능해질것이다. 본발표를통해치과보철영역에서세라믹 3D 프린팅의의미와가능성에대해함께생각해보는시간이되기를희망한다. S51-12 In Recent Progress of 3D Printing Systems for Designing Ceramic-based Tissue Engineering Scaffolds GeunHyung Kim *. Sungkyunkwan University The achievement of tissue engineering can be highly depending on the capability to generate complicated three dimensional (3D) micro/ nano-structures. 3D structure can induce more realistic cellular behavior when compared to that of 2D structure. So, various fabrication techniques that can be used to precisely design 3D architecture and topography of scaffolding materials will signify a key aspect of multi-functional tissue engineering. Previous methods for obtaining scaffolds based on top-down are often not satisfactory to produce complex micro/nano-structures due to the lack of control on scaffold architecture, porosity, and cellular interactions. In recent, the 3D printing method can be used to design sophisticated 3D tissue scaffolds that can be engineered to mimic the micro/nano-architecture of tissues, using computer aided approach. However, the fabrication of a bioceramic (high weight percent)-based 3D microfibrous structure is extremely difficult because of the low process-ability of bioceramics. In this presentation, the 3D printing methods including a cell-printing process for attaining highly bioactive and functional ceramic-based scaffolds for tissue engineering applications will be introduced. Moreover, various cellular responses will show that the fabricated scaffolds can carry out their structural and biological functionality. S51-13 Porous Bio Ceramic Scaffolds using Three-Dimensional Co-extrusion based on Ceramic/Camphene feed Rod for Biomimicking 생체모방기술을이용한경사기능형다공성세라믹지지체제조기술안민경 *, 김종우, 고영학. 고려대학교 Bio material scaffolds are great importance for tissue engineering and orthopedic implant owing to their enable support biological property and biomechanical property for surrounding bone. These biomaterial 한국세라믹학회 99

110 2018 년한국세라믹학회춘계연구발표회 scaffolds require good porous structure such as porosity, pore size and good interconnectivity with pores. Recently ceramic, polymer and metal have been extensively used as bio material for fabricating porous scaffold to promote bone ingrowth in to pore. We herein demonstrate a novel, versatile approach to produce biomimetic porous ceramics with a continuously gradient porous structure using threedimensional extrusion of a bilayered ceramic-camphene mixture/pure camphene feedrod. In this study, bi-layered feed rod comprised of the ceramic/camphene mixtures and law contents of ceramic or pure camphene used as the lower and upper part feed rod. Bi-layered feed rod could be gradually extruded with core/shell structure because of the wall slip phenomenon. This enabled the formation of green filaments comprised of a camphene core surrounded by a ceramic/ camphene shell, where the core/shell thickness ratio increased gradually as extrusion proceeded. Biphasic calcium phosphate (BCP) ceramics with a gradient porous structure could be successfully produced by three-dimensionally depositing the extruded filaments layer by-layer. We evaluated gradient micro structure with produced gradient porous BCP ceramic scaffold by scanning electron microscopy (SEM) and Micro CT. S51-14 Photo-curable 3D Plotting Technique for Complexshaped Architecture with High Shape Retention using a Ceramic Suspension 광경화성세라믹페이스트를이용한높은형상유지능을가지는 3D 플라팅기술맹우열 *, 이정빈, 고영학. 고려대학교 This study proposes a novel way of creating three-dimensional ceramic object with pre-determine computer modelling design file by photo-curing-assisted 3D plotting technique, which can rapidly photopolymerized in situ by UV light throughout extruding green filament mixture of biphasic calcium phosphate (BCP) ceramic powders and photocurable monomers and photo initiator, dispersant by a fine nozzle. In particular, a mixture of 90 wt% diruethane dimethacraylate (UDMA) and 10 wt% triethylene glycol dimethacrylate (TEGDMA) enables the favorable extrusion properties which can have a shear thinning behavior. Most importantly, the slurry also has good shape retention because of high green strength after photo-polymerization. This result has been proven by a free-standing helical architecture, which was successfully produced without any supporting materials. In addition, the unique in situ photo-polymerization process during extrusion allows the green filaments to be strongly bonded each other, while maintaining their circular cross-section, and thus a ceramic scaffold of interconnected pore with a tightly controlled porous structure could be produced. This innovative approach allows for the formation of complex shape architecture such as dense/porous object of mimic natural bone structure. S51-15 Structural Stability Improvement of 3D Printed Ceramic Scaffolds with the Photo-Polymerization Based Material Extruding System 성아람 *, 박홍현, 윤희숙. 재료연구소 Material extruding (ME) process is one of the additive manufacturing method which utilizes layer by layer stacking of supplied materials to form 3D structures based on the desired model. Especially, the materials containing ceramic for ME need suitable rheological properties for stable and accurate printing. Lack of stable materials/ pastes results in flattening of layers that lead very low printing accuracy or even collapse of structure itself over time. These limitations can be overcome by stabilizing the layers as they are printed, either by hardening the layers or controlling the paste conditions. In this study, standard 3D structures were printed with optimal extrusion printing condition (paste viscosity and scan speed) by our developed extrusion system. Cross-sectional images of the structures were investigated with the curing time and nozzle diameter change. After printed structures were sintered at specific temperatures, the effects of the UV curing time on physical properties such as linear shrinkage and density were measured. G6-1 Infrared Transmission Edge and Refractive Index Dispersion of Ge-Sb-S-Se Glass Ge-Sb-S-Se 유리의적외선투과단및굴절률분산거동이준호 1*, 이우형 1, 김현 1, 신상열 1, 이지인 1, 최주현 2, 최용규 1. 1 한국항공대학교, 2 한국광기술원적외선카메라에대한수요가군수분야를위시하여다양한민수분야로확대되고있는상황에서적외선투과렌즈의양산성및가격경쟁력이더욱중요해지고있다. 또한스마트폰등의모바일전자기기에내장될수있는수준의소형화추세와더불어고화질적외선영상의취득을위한광학적수차의저감에대한요구가증대되고있다. 칼코지나이드유리는결정질소재에비하여굴절률및분산의제어가매우용이하며몰딩공정을통한렌즈성형이가능하다. 원적외선대역에서활용할수있는상용칼코지나이드유리는대부분셀레나이드유리이며공히저분산특성을나타낸다. 따라서색수차및구면수차등의광학적수차를최소화하기위하여기존저분산유리와함께고분산유리가필요한실정이다. 본연구에서는삼성분계 Ge-Sb-Se 유리를대상으로셀레늄을대체하여황이첨가될때발생하는제반물성의변화를조사하였다. 특히황함량에대한적외선투과단의변화를정량적으로파악하였으며나아가굴절률분산을제어하여고분산특성의유리조성을확보하였다. G6-2 Al 2 O 3 슬러리를이용한스프레이공법에따른화학강화유리의제조및특성임현태 1,2*, 권민형 1, 김선욱 1, 김진호 1, 배동식 2, 황종희 1,*. 1 한국세라믹기술원, 2 창원대학교최근들어모바일에적용되는얇은박막의글라스는높은강도가요구되고있으며이온교환법을이용한화학강화가일반적으로채용되고있다. 화학강화방법으로많이사용되고있는것은 dipping 법이다. 하지만 dipping 법은공정손실과생산성이낮다는단점을갖는다. 이러한문제점을해결하기위해서스프레이공법을이용한방법이제시되고있으며, 이에따른 KNO 3 용액이함유된새로운슬러리제조가필요하게되었다. 따라서본연구에서는 KNO 3 용액과 Al 2 O 3 나노분말을이용한새로운슬러리를제조하여스프레이공법으로화학강화후특성평가를함으로써슬러리의이용가능성에대하여평가하였다. 그결과 KNO 3 용액과 Al 2 O 3 나노분말의몰비가 1 : 0.3 인슬러리를이용하여 450 o C 강화온도에서 2.5 h 시간으로강화한시편이가장우수한특성을나타내었다. 이시편의표면압축응력 (CS) 은 793 MPa, 깊이 (DOL) 는 37 µm 로확인되었다. 이는기존에보고된스프레이공법을이용한강화특성 (CS: 700 MPa, DOL: 25 µm) 보다우수하였으며, 현재상용되는 100 한국세라믹학회

111 구두발표 dipping 법에의해강화처리된박판유리 (CS: 850 MPa, DOL: 40 µm) 와유사한수준이다. G6-3 Properties of AR-Glass Fibers with Refused Coal Ore in Fiber Spinning Conditions 방사조건에따른석탄폐석을함유한 AR-glass 섬유의특성이지선 1,2*, 김진호 2, 임태영 2, 이미재 2, 이영진 2, 전대우 2, 현승균 1. 1 인하대학교, 2 한국세라믹기술원본연구에서는, 석탄폐석을 40 wt% 함유한 AR-glass 조성을선택하여연속방사에의해유리섬유를제조하였다. 먼저마블유리의용융특성을확인하기위하여원료를백금도가니에넣고 1650 o C로용융시킨후서냉하였다. 비정질유리인지확인하기위해서 XRD 를측정하였고고온점도를측정하여연속방사조건을조사하였다. 와인딩속도를 100~700 rpm 변화에따른직경의변화를관찰하였다. 섬유화온도를 1240~1320 o C 변화에따른직경의변화또한확인하였다. 제조된방사섬유의특성은광학현미경관찰, 인장강도, 탄성률, 내알칼리테스트등으로확인하였다. G6-4 Thermal History-driven Glass Structure Variations in Alumino-borosilicate Glass System Alumino-borosilicate 계에서의열이력에따른유리구조변화백지연 *, 신승호, 김선효, 조중욱. 포항공과대학교 It is important to control the glass network structure which governs various thermos-physical properties such as viscosity, thermal and electric conductivities, and crystallization kinetics. In order to identify the effect of temperature on structural changes in alumino-borosilicate glass network, we imposed different temperature ranges to a Na 2 O- CaO-Al 2 O 3 -SiO 2 -B 2 O 3 glass system. We analyzed aluminate molecular structures in the glass using 27 Al MAS NMR spectroscopy. At around the glass transition temperature, most of aluminate structures exist as AlO 4, which acts as a glass former. When the temperature is above the melt crystallization temperature, the AlO 4 structure is drastically decreased and glass structures are mainly composed of AlO 5 and AlO 6, which act as glass modifiers. Thermodynamic assessment based on Gibbs energy minimization was used to confirm the dependency of aluminate structure s amphoteric characteristic on temperature by calculating the site fraction of aluminate molecular structures at different temperatures. Temperatureinduced aluminate structural variation can also influence silicate and borate structural changes, which have been confirmed by the 29 Si and 11 B NMR spectra. Our research involves important data to understand the temperature effect on structural variations in aluminate glass system. G6-5 Structural-rheological Study of Silicon Carbide (SiC) Effects on Shear Thinning Behavior of CaO-SiO 2 -CaF 2 based Mold Flux for a Continuous Steel Caster SiC 첨가시 CaO-SiO 2 -CaF 2 계몰드플럭스의전단박화능변화관찰을위한유변학적및구조적분석연구정영찬 *, 조중욱, 신승호. 포항공과대학교강의연속주조공정에서사용되는몰드플럭스는주로용강의재산화방지, 윤활작용및열전달제어의역할을한다. 이중몰드프럭스의윤활작용은주편의표면품질측면에있어서매우중요하다. 윤활작용이제대로기능하기위해서주형벽면에서의몰드플럭스점도는낮을수록바람직하지만, 용강탕면에서는슬래그혼 입의문제로인해점도가높을수록바람직하다. 이와같은모순점은몰드플럭스가전단박화특성을갖도록함으로써해결이가능해진다. 기존의몰드플럭스가향상된전단박화능을가질수있도록만들기위해유리구조를변화시키고자하였다. 이를위해몰드플럭스내 silicate 구조의 O 원자를 C 원자로치환하여 crosslinking 의효과를도모하고자하였으며, 이러한효과가실제로전단박화능을향상시키는지를회전식점도계를통한점도측정을통해확인해보았다. 샘플의제조를위해 C 을직접투입하는대신 SiC 를 precursor 로사용하였는데, 몰드플럭스조성계내에 C 의고용도가낮기때문에이미 Si 과결합을이루고있는물질을통해원하는유리구조를합성하고자하였다. 또한 SiC 가구조에참여하는데필요한충분한에너지를주기위해아크전기용해로를이용하여샘플을용융시켰다. 만들어진샘플은 Raman spectroscopy 를통해원하는구조가합성되었는지를확인해보았다. Silicate 구조에해당하는 Raman shift 영역의 peak 를 de-convolution 하여 C 의투입량에따라 degree of polymerization 이어떻게변화하는지를알아보고, 이를통해 C 의 O 치환여부를간접적으로알아보았다. G6-6 Light-Facilitated Formation of Quantum Dots in Glasses for Photonic Applications 빛을이용한유리내양자점형성및포토닉스응용허종 *, 소병진. 포항공과대학교나노미터크기의양자점은결정의크기조절에따라광특성이변화하는양자제한효과를나타낸다. 특히, IV-VI 물질인 PbS 양자점의경우, 다른재료에비해엑시톤보어반지름 (a B = 18 nm) 가크기때문에광학적특성을제어하기가용이하고, 크기조절을통하여광통신에서주로사용되는 1.3 ~ 1.7 um 파장범위의형광발생이가능하다. 이러한양자점은박막증착또는콜로이달합성등의방법을이용하기도하나유리내에형성시키는경우, 기계적, 화학적특성을획기적으로향상시킬수있어광소자로의활용이용이하다. 양자점의위치를제어하며석출하는방법으로이온주입방법과펨토세컨드레이저를조사하는방법이있다. 그러나, 양자점성장을위한후처리열처리혹은 5시간이상의조사가필요하며레이저장비가고가인단점이있다. 그에반하여연속발진레이저 (cw laser) 를이용하는경우, 결정성장에필요한시간 (~us) 동안에너지를연속적으로공급해줄수있다. 본연구에서는이러한연속레이저를이용하여양자점을석출하고포토닉스소자로매몰형광도파로를제조하는연구를수행하였다. 532 nm 연속레이저광을 Ag 나노입자가형성된유리표면에조사하여 PbS 양자점을석출하였고, 조사한영역의온도는 Sm 3+ 이온의형광세기비방법을통하여측정하였다. 조사방식의변화를통하여매몰형채널을형성하였고, 도파손실, 굴절률, 채널내미세구조등을분석하여능동매몰형광도파로써의채널성능을평가하였다. G6-7 Eu 3+ -Tb 3+ co-doped Oxyfluoride Glass for Wide Color Gamut UV-LED Color Converter 고색재현범위구현을위한 Eu 3+ -Tb 3+ 가동시첨가된 Oxyfluoride 유리 UV-LED 색변환소재이한솔 1*, 최용규 2, Kenji Shinozaki 3, 정운진 1. 1 공주대학교, 2 한국항공대학교, 3 National Institute of Advanced Industrial Science and Technology Oxyfluoride 유리는 fluoride 유리의낮은포논에너지로인해첨가되는희토류이온의양자효율이향상되고, oxide 유리의높은화학적, 열적안정성을갖는다. 이러한장점으로인해희토류가첨가 한국세라믹학회 101

112 2018 년한국세라믹학회춘계연구발표회 된 oxyfluoride 유리는색변환소재로써많은연구가진행되어왔으나, 첨가되는희토류에따른양자효율의제한과발광파장의넓은선폭으로인해색재현범위가제한되는등의문제로인해색변환소재로써적용에한계가있다. 일본 AIST 의 Kenji shinozaki 는 BaF 2 를이용한 oxyfluoride 유리에 Eu-Tb 을첨가하여높은색변환효율과 90% 이상의양자효율을갖는색변환소재를제조하였다. 하지만, 가공이어려울만큼유리의안정성이취약하고강한적색발광으로인해색재현범위가좁은문제가있다. 본연구에서는, BaF 2 를이용한 oxyfluoride 유리소재의특성을향상시키고자, SiO 2 를치환첨가하여양자효율의감소는최소화하며우수한안정성을갖는유리를제조하였다. 제조된유리는양자효율을측정하고열분석을통해열특성변화를확인하였으며, 유리의파손없이가공이가능한수준의 SiO 2 첨가량을확인하였다. 또한, 색재현범위향상을위해 Eu-Tb 의함량을조절하였으며, 이에따른 375 nm LED 를이용한 PL spectrum 을측정하여녹색과적색파장의세기가유사해지는비율을확인하였다. 이를백색 LED 로구현하기위해 375 nm UV-LED 와 450 nm 의청색 LED 를함께사용하였으나, 청색 LED 의 intensity 가녹색과적색에비해높아이를제어하기위해희토류가첨가된유리세라믹을필터로활용하였다. 최종적으로 375 nm 와 450 nm LED 로여기하고제조된유리와필터유리세라믹을활용하여백색 LED 의구현을확인하였다. G6-8 Phosphor-in-Glass Composites Designed for Color-Tunable White Light-Emitting Diodes 형광체 / 유리복합체를적용한백색 LED 의색상조절이승렬 *, 허종. 포항공과대학교백색 LED는 Ce 3+ :YAG 황색형광체와청색 LED를이용하는 2색방식이일반적이다. 이렇게구현된백색광은적색비율이낮은냉백색이라는문제점이있어부족한적색형광을보완하여야하며, 조명용 LED의적용범위가확대됨에따라다양한색상을구현할수있는백색 LED 또한요구되고있다. 또한황색형광체를도포할때이용하는고분자바인더는고온에서열화되어백색 LED 의수명특성을저하시키기때문에안정성이우수한바인더재료를적용할필요가있다. 백색 LED 는 Ce 3+ :YAG 형광체의황색형광과투과된청색광이혼합되어백색광을구현하는데, 각도에따라청색광과황색광의비율이달라백색광의색상에차이가발생한다. 본연구에서는형광체 / 유리복합체를제조하여백색 LED를구현하고, 백색광의각도에따른색상특성을측정함으로써불균일한색상분포가발생하게되는원인을분석하였다. 또한이를바탕으로색온도및색상조절이가능한형광체 / 유리복합체및백색 LED 를제조하여광특성을분석하였다. G6-9 Thick-film Phosphor-in-glass with Nd 3+ Doped Phosphate Glass for White LED with Wide Color Gamut Nd 3+ 가첨가된인산염계유리프릿을이용한고색재현성백색 LED 용후막형 Phosphor-in-Glass 김성현 *, 한가람, 정운진. 공주대학교기존 LCD-BLU에사용되는백색 LED는유기바인더에녹색및적색형광체를혼합하여사용하였으나, 유기바인더의문제점으로고출력장시간운용시수명과효율이저하되며, 색좌표의이동이발생한다. 또한, 녹색및적색형광체는넓은발광선폭으로인해색재현범위가제한되어, 고색품질의 LCD 적용에한계가있다. 이를보완하기위해, 최근색변환소재로서양자점이사용되고있으나, 낮은장기내구성과높은생산단가의단점을갖는다. 또다른 방식의색변환소재인 phosphor-in-glass (PiG) 는무기바인더인유리를이용하여내구성이향상되었으나, 소성후가공공정이필요하며, 형광체를직접적용함에따른넓은발광선폭으로인해색재현범위가제한되는문제가있다. 본연구에서는, 녹색및적색형광체의발광선폭을제어하기위해 Nd 3+ 가첨가된 P 2 O 5 -ZnO-SiO 2 -R 2 O-R 2 O 3 (R=Na, K, Al, B) 계유리를제조하였으며, 녹색형광체로서 Lu 3 Al 5 O 12 :Ce 3+ (LuAG) 및적색형광체로서 CaAlSiN 3 :Eu 2+ (CASN) 을복합첨가한 paste 를제조하였다. Paste 는간단한스크린프린팅공정을통해유리기판위에 50 um 두께의후막형 PiG 를형성하였다. 백색을구현하기위해유리및형광체비율을조절하였으며, 최적의발광스펙트럼조절을위해 Nd 3+ 의농도를변화시켰다. 제조된샘플은적분구를이용하여 PL spectrum, 색좌표, CRI 및색재현범위를측정하였다. G6-10 Precipitation of Surface Passivated CdSe QDs in Silicate Glasses by Laser Irradiation 레이저조사를통한표면개질 CdSe 양자점석출이호정 *, 허종. 포항공과대학교양자점은다양한파장대의빛이발생하므로디스플레이, 태양전지, LED 등에응용되고있다. 그러나양자점은단위부피당표면적이넓어표면에결함준위가많이형성되고효율이저하되는단점이있다. 콜로이드양자점의경우 core/shell 및 graded shell 구조도입방법등을통해양자효율을증가시키는연구가진행되고있다. 본연구에서는, 레이저조사를통해유리내부에석출된 CdSe 양자점의표면에 Cd 1-x Zn x Se graded shell 구조를형성하여표면의결함에의해나타나는빛의방출 (λ = 620 nm) 을감소시켰다. 먼저용융급냉법으로 ZnSe/CdO를다량함유하고있는유리를제조한후, Ag 나노입자를이온교환과후속열처리를통해유리표면에형성시켰다. 이후유리표면에 532 nm 파장의연속파레이저빔 (continuous wave) 을조사하여양자점을석출하였다. 레이저세기에따른유리내부의온도증가는희토류이온의형광변화를이용한 optical thermometry 법으로측정하였고, 라만분광, XRD (Xray diffraction) 과 TEM (Transmission electron microscopy) 을통해양자점의구조를분석하였다. G7-1 Corrosion Behavior of Stabilized-Zirconia by Calcium Fluoride Mold Flux Calcium Fluoride가포함된 Mold Flux에의한안정화지르코니아침식거동소성민 1*, 김경훈 1, 박주석 1, 김형순 2. 1 한국세라믹기술원, 2 인하대학교 Zirconia (zirconium dioxide, ZrO 2 ) is particularly used in carbon containing refractories of steelmaking such as sliding plates, submerged entry nozzles (SEN) because of good fracture toughness, low thermal conductivity, high corrosion resistance against various types of molten slags. Corrosion rate of zirconia-containing refractory is influenced by the presence of fluoride and Na 2 O in slag or mold flux. Therefore, it is very important to investigated corrosion behavior of zirconia by CaF 2 containing mold flux to improve zirconiacontaining refractory. In this study, we investigate the corrosion of MgO, CaO and Y 2 O 3 stabilized zirconia by CaF 2 containing mold flux for submerged entry nozzles at 1,550 C under kinetic condition. After experiment, mold flux-zirconia interfaces were analyzed by FE-SEM/ EDS, XRD to compare corrosion behavior depending on the type of stabilizing agents. It was determined that interaction of zirconia and 102 한국세라믹학회

113 구두발표 mold flux precipitate a phase transformation of zirconia from tetragonal or cubic into monoclinic. G7-2 High Porosity Refractory Utilized by Tailing and Smelting Byproducts 광미와제련부산물을활용한내화재의제조및평가김영재 *, 박현식, 김민석. 한국지질자원연구원보크사이트의제련부산물인적니와광산폐기물인광미를활용하여겉보기기공률 75% 이상의고기공내화재를제조하고, 이의물리적특성을평가하였다. 미세단층촬영기 (Micro-CT) 를통하여기공의크기및분포를정량적으로평가하였다. 기공의평균입경 (D50) 은약 100 ~ 200 μm 임을확인하였으며, 광미함량의증가에따라평균입경이증가함을확인하였다. Hot-disk 법을통하여내화재의열전도도를측정하였고, 결정상의종류가열전도도에미치는영향을확인하였다. 적니와광미의혼합조성변화에따른주요결정상의변화를확인하였으며, Quartz 결정의형성에따라열전도도가크게증가함을확인하였다. 끝으로 Ashby-Glicksman 모델을통하여기공률에따른열전도도의변화를평가하였다. 적니와광미함량에따라셀구조가변화함을관찰하였고, 정확한열전도도예측을위해서는 Ashby-Glicksman 모델에서이러한차이를고려해야됨을확인하였다. G7-3 Preparation and Evaluation of Artificial Aggregates Using Fluidized Bed Boiler Ash 순환유동층상보일러석탄회를이용한인공골재제조및평가이웅걸 *, 전세훈, 송명신, 김경남. 강원대학교최근화력발전소에서기존의미분탄연소보일러방식대신연소효율및연료의다양성등의장점을살린순환유동층상보일러방식이국내에서는늘어나고있다. 미분탄플라이애시의경우수화열의저감, 장기강도의증대, 유동성의개선등의특성으로시멘트및콘크리트혼합재료로서많이사용되고있다. 순환유동층상보일러플라이애시의경우연소방식에서탈황을위해석회석을첨가하는데이때석회석의탈탄산화반응후탈황반응에참여하지못한 CaO 성분이플라이애시내에잔재하여 free-cao 상태로존재하게된다. 이러한순환유동층상보일러플라이애시를시멘트및콘크리트의혼화재및치환재료로사용할경우급결, 유동성저하, 발열, 부피팽창등의문제를발생시키게되어활용되지못하고대부분매립되고있어처리방안이시급히요구되고있는실정이다. 그리고현재우리나라는최근환경규제의강화와골재채취에대한민원이급증하면서골재의고갈현상이심화되고있으며골재자원의안정적공급이점차어려지고있는실정이다. 따라서이를해결할수있는하나의방안으로유동층상보일러플라이애시의포졸란반응을이용한비소성인공골재를제조하였다. 본연구는비소성으로제조된인공골재는 KS F 2527( 콘크리트용골재 ) 의기준에부합과경량콘크리트용골재가아닌일반콘크리트제품에적용가능성에대하여평가하였다. G7-4 A Method for Performance Assessment of Self-healing Using by Cementitious Material 시멘트계재료를사용한자기치유성능평가를위한분석방법김동현 *, 강국희, 임영진, 이승헌. 군산대학교콘크리트구조물의수명연장에대한연구가진행되면서자기치유에대한가능성이제기되어왔다. 자기치유의메커니즘으로는크게 Autogenous healing과 Autonomous healing이있다. 이연구에서는 Autogenous healing 중시멘트를활용한자기치유의성능을 이미지분석을통하여정량화하는방법을연구하였다. 이미지는 FE-SEM (Field-Emission Scanning Electron Microscopy) 를통해 BSE (Backscattered Electron) 이미지를획득하였으며, 이를위해시편의전처리를진행하였다. 시편은자기치유양생후수화물의형태를유지하기위해진공건조를시행하였으며, 에폭시의진공함침으로 Cold mounting 을하였다. 기기분석을위해시편을연삭및연마를하였다. 이미지는파노라마의형식으로전체의균열을확인할수있도록촬영했으며, 획득된이미지는 Image Pro-Plus 6.3 프로그램으로분석을진행하였다. 이미지분석의전처리를시행한후이미지에서시편의부분을 mask 한후균열에서자기치유수화물과수화물로인해충진되지못한이미지로분류한후면적계산을통해충진율값을도출하였고, 각이미지에서일정한간격으로총 10 군데의너비를측정한후평균값을냈다. 이충진율값과평균값을통해균열너비에따른충진율의값을보정하여시편에대한자기치유성능에대해평가하였다. 본연구는국토교통부건설기술연구사업의연구비지원 (18SCIP- B ) 에의해수행되었습니다. 이에감사드립니다. G7-5 Effect of Fructan from Microbes on the Pore Structure of Cement Materials 시멘트재료의 Pore Structure 개선을위한미생물유래 Fructan의효과전세훈 *, 이웅걸, 김경남, 송명신. 강원대학교콘크리트는사용재료, 배합, 제조방법, 양생, 환경등의요인에따라많은영향을받는것으로알려져있지만, 콘크리트열화에는초기콘크리트배합재료중에서물에의한영향이가장크다고할수있다. 콘크리트의기본결합재인시멘트페이스트경화체는 10 μm부터 0.5 nm 미만의광범위한공극크기를갖는다공성재료이다. 시멘트페이스트중의공극은크게두그룹으로나뉘게되는데 C-S-H 수화물내부에존재하는 gel pore와물의증발에의하여생성되는 capillary pore로존재하며, 시멘트페이스트의공극분포가콘크리트열화의정도를지배하는것이일반적이며표면마모, 공극속에생기는염류의결정압으로인한균열, 동결융해및화염과같은온도환경에영향을받아내구성및사용수명이줄어들게된다. 콘크리트의수명은약 20~30년으로볼때콘크리트의열화방지또는열화지연에의해콘크리트의수명을 10년이상향상시키면상대적으로콘크리트의사용이적어질수있을것이며, 그만큼 OPC의사용량을줄이고 CO 2 배출량을감소시킬수있을것이다. 그러므로콘크리트의내구성향상은지구환경개선에크게기여할수있다고할수있다. 한편, 콘크리트의내구성향상을위한연구의일환으로콘크리트균열을자기치유하고자하는연구가진행되고있으며, 콘크리트균열의자기치유는유기재료및무기재료에의한다양한방법으로연구되고있으나, 유기재료및무기재료의한계로인하여새로운시도중의하나인미생물에의한균열자기치유에대한연구가진행되고있다. 미생물에의한콘크리트균열의자기치유는학술적으로매우유용한기술임에는틀림이없으나, 콘크리트균열발생시기또는균열발생조건등에맞추어반응을주도하기위한미생물의생육조건의어려움으로실용성에많은의문이제기되고있다. 본연구에서는콘크리트에서의미생물의생육조건의어려움을극복하기위한방안으로, 미생물인박테리아의중간생성물을콘크리트에적용하여콘크리트의균열치유또는내구성향상이가능한지의여부를검토하고자하였다. 따라서, 본연구에서는콘크리트의내구성을향상시키기위해영국의 Newcastle university에서연구중인 concrete crack healing이가능한박테리아접착제인 BacillaFilla의중간생성 한국세라믹학회 103

114 2018 년한국세라믹학회춘계연구발표회 물인 Levan glue 를사용하여콘크리트의내구성에미치는영향을검토하기위하여, 박테리아의반응중간생성물인 Levan glue 와같은특성을갖는미생물의반응생성물인 fuctan (levan) 을이용하여시멘트페이스트의수화에미치는영향과미세구조에미치는영향을검토하였다. G7-6 Characteristics of Phosphorus in Fly Ash Generated by Co-firing with Renewable Energy Fuel 신재생에너지연료혼소로배출된플라이애시중의인특성이승용 1*, 강국희 1, 이원준 2, 이승헌 1. 1 군산대학교, 2 군산대학교 R&D 협동조합최근국내화력발전소에서는신재생에너지의무할당제도 (Renewable energy Portfolio Standard) 도입으로말미암아신재생에너지연료인바이오에너지연료및폐기물에너지연료가석탄과같이혼소하여운영되어지고있다. 바이오에너지연료및폐기물에너지연료사용량은현재석탄대비 5% 미만이나 2020년에는 10% 까지증가할전망이다. 바이오에너지연료및폐기물에너지연료혼소시우려되는성분으로인을들수있다. 인성분은시멘트의수화반응을지연시키고강도발현을저해시키는물질이다. 본연구에서사용된신재생에너지연료는우드펠렛, Bio-SRF, 하수슬러지, 하수슬러지연료탄이며이를혼소한플라이애시를검토하였다. 총인은 XRF를사용하였고, 수용성인은 EN Annex C에따라실험하였다. 그결과신재생에너지연료혼소에의한플라이애시의총인은 0.31~1.19% 로 EN 기준치 5.0% 를만족하였고, 수용성인또한 0.31~7.02 mg/kg로 EN 기준치 100 mg/kg를만족하였다. S71-2 Suggestions on Improvement Procuring Durable Life of Concrete Structures 콘크리트구조물의내구수명확보를위한개선방향제언박민용 *. 삼표산업주요사회환경인프라로시공된콘크리트구조물이설계시적절하게고려하지못한환경적요인으로심각한열화에지나치게급속히노후화되는콘크리트의내구성문제가사회적으로문제를야기하고있다. 또한, 국내에서콘크리트구조물에대한내구성문제의심각성은각언론의집중적인조명을받아 무너지는콘크리트신화, 콘크리트대재앙, 콘크리트부식과의전쟁 등특집기획기사로다루어져왔으며, 최근에는 한국은콘크리트공화국 등의헤드라인기사로보듯이그심각성이사회적인환경문제로까지확대되고있는실정이다. 이에콘크리트구조물의급속한노후화로인한잠재적인안전사고로부터국민의재산및안전을보장하기위하여내구수명확보를위한대책마련이필요하다. 그렇다면 미래의콘크리트구조물은어떤모습이어야하는가? 에대해생각해볼때, 열화환경조건에서저항성이우수하며, 내구성이양호한양질의콘크리트구조물이라고말할수있다. 이러한콘크리트구조물의특성을위해서는콘크리트구조물의성능중심설계및내구성설계, 다양한고품질원료의사용, 제조시최적의배합설계, 선진화된유통시스템및시장형성이제도적으로요구된다. 따라서내구적이고환경적으로지속가능한콘크리트구조물을건설하기위한많은연구가관련분야의업계및학계의적극적지지와활발한연구수행이요구되어야하며제도개선, 연구과제, 정부정책등에대한개선방향및실용적대안을제안하고추진하여야한다. S71-3 The Role and Task of Portland Cement on Concrete Durability 콘크리트내구성에미치는포틀랜트시멘트의역할과과제정연식. 쌍용양회기술연구소콘크리트는반영구적인이라고하는것에대해서대부분의사람들은잠재적으로그럴것이라고생각하는경향이강하다. 아마도이것은과거의콘크리트구조물이여전히사용되고있기때문이라서반영구적이라고생각하는것같다. 하지만, 최근들어콘크리트구조물의내구성즉공용성과관련된여러가지의문내지는안전과관련된사건들이국내외매스미디어를통해연이어발생하고있다. 그러면과거의콘크리트와현재의콘크리트는구성재료에서큰변함이없는데어떤차이점이존재하기에오히려과거건설한콘크리트구조물이장기간에걸쳐사용해도문제가없는것일까? 콘크리트내구성이라는것은재료외에도기간, 환경이라는요소가포함되어있다. 다시말해서기간과환경속에서도견딜수있는재료이어야한다. 이러한평가는장시간소요되고, 예측어려운속성이있기때문에단순히강도만으로내구성을대신할수밖에없는현실로강도 = 내구성즉강도지상주의에빠질수밖에없는것같다. 따라서강도의역할을많이담당하고있는시멘트는지속적으로강도가높아져왔다. 이렇게과거보다강도가높은시멘트를사용한콘크리트가왜안정성에문제가되고있는가과연강도가높은시멘트가좋은시멘트인가에대한의문점을가질수박에없다. 그러면좋은시멘트란어떤것인가에대한앞으로의역할과과제에대해서방향을재설정할때가왔다고생각한다. S71-4 The Role of Cement Industry in the Use of Mineral Mixtures 무기질혼합재사용에대한시멘트산업의역할송명신 *. 강원대학교삼척캠퍼스시멘트는건설산업의핵심이되는콘크리트의기본결합재로서가장중요한재료이다. 시멘트의수경화특성으로인하여수십년전부터다양한폐기물또는부산물이시멘트에대하여부분적으로치환또는혼합되어콘크리트의결합재로사용되어왔다. 이러한부산물또는폐기물의가장대표적인재료는플라이애시와고로슬래그가있다. 이중에서플라이애시는화력발전소부산물로서포졸란반응에의해콘크리트의물성이개선된다는논리로가장오랫동안콘크리트의시멘트치환용혼합재로사용되어왔다. 그러나최근화력발전소에사용하는연료인석탄의물성변화및연소방식의변화로인하여다양한형태의플라이애시가배출되고있다. 최근의이러한다양한연료및연소방식에의해배출되는플라이애시는과거사용되었던플라이애시와는화학적조성및물리적특성이많은차이가있다. 특히일부연소방식의차이에의해발생하는플라이애시는포졸란반응에기여하지못하는물성을갖고있음에도, 일부콘크리트산업에서는무분별하게과거의플라이애시와동일하게사용되고있는실정이다. 이러한플라이애시사용에따른콘크리트의물성은매우다양한형태로나타나고있으며, 콘크리트의품질에대한검증조차제대로이루어지지않고있는실정이다. 혼합재의사용에의한품질이검증되지못한콘크리트의물성또는내구성등에대한책임은혼합재를사용한콘크리트제조업자의책임이겠지만, 콘크리트의기본결합재인시멘트의제조자의책임역시무관하다고할수없다. 시멘트산업에서는콘크리트에혼합재사용을위한시멘트의물성을개선하려는노력도필요하겠지만, 표준화된시멘트에콘크리트품질에영향을미칠수있는부적절한혼합재의사용에대한적절한규제또는사전대응방안을수립해야할필요가있다고할수있다. 따라서본발표에서는콘크리트산업에 104 한국세라믹학회

115 구두발표 서부적절한혼합재사용에따른시멘트산업의역할에대하여논의해보고자한다. S71-5 ICT(Information and Communication Technology) and Cement/Concrete Industries ICT(Information and Communication Technology) 와시멘트콘크리트김원기 *. 아세아시멘트최근화두가되는제4차산업혁명은새롭게발전하고있는 ICT(ICT(Information and Communication Technology) 를기존제조업과융합하여가치를혁신하는것을의미한다. 전형적인프로세스제조 (Process Manufacturing) 산업에속하는시멘트콘크리트산업은주로인력절감이나품질관리를목적으로공장자동화, 현대화작업을진행하고있다. 시멘트콘크리트산업에서제4차산업혁명은공장자동화에서한차원높은스마트플랜트 (Smart Plant) 로진화하는것으로기존시스템 (Legacy System) 을새로운 ICT 시스템과연동하는것이가장중요하다. 여기에서는시멘트콘크리트산업에서스마트플랜트추진에있어서문제점과과제를중심으로논하고자한다. S71-6 Improvement of Performance and durability of cement and concrete by nanotechnology 나노기술에의한시멘트 -콘크리트의성능및내구성향상이승헌 *. 군산대학교나노기술은나노레벨의물질의이해와제어에관련된분야로서건설소재를포함한여러분야에서가장활발하게연구되는분야이다. 오늘날포틀랜드시멘트산업은온실가스를다량으로배출되는산업으로인식되고있어, 온실가스를감축하고자하는노력을꾸준히진행하여오고있다. 나노레벨에서시멘트소재의복잡한구조를잘이해한다면강도및내구성을향상시킨새로운세대의시멘트소재를개발할수있을것으로기대되고있다. 그리고나노기술을적용하면시멘트입자의수화반응에대한해석을명확하게할수있어나노입자사용으로인한성능및내구성향상기술이한층더발전할수있다. 또한건설소재의생산및환경비용을낮출수있을것으로예상하고있다. 본발표에서는시멘트 콘크리트에서나노입자의역할에대해언급하고자한다. G8-1 First-Principles Investigations on Defect Properties of (CH 3 NH 3 )PbI 3 제일원리를이용한 (CH 3 NH 3 )PbI 3 의결함성질분석이동화 *, 김성훈. 포항공과대학교 (CH 3 NH 3 )PbI 3 기반디바이스는저비용으로손쉽게제작이가능하면서도우수한성능을지니고있어태양전지, 멤리스터등다양한분야에서각광받고있다. 하지만 (CH 3 NH 3 )PbI 3 기반디바이스가실제산업에활용되기위해서는 hysteresis, endurance 등과같은안정성과관련된문제들이해결되어야한다. 선행연구들은 (CH 3 NH 3 )PbI 3 내의다양한종류의결함들이안정성에영향을미치는주요한요인으로보고하였다. 따라서이연구에서는제일원리기반 DFT 계산을적용하여 (CH 3 NH 3 )PbI 3 내의결함특성에대해조사하였다. 우리의계산결과는 (CH 3 NH 3 )PbI 3 의 hysteresis, endurance 등이특정한결함과밀접한관련이있다는사실을밝혀내었다. 우리의연구결과는 (CH 3 NH 3 )PbI 3 기반디바이스가다양한산업에응용되는게있어초석이될것이다. G8-2 Hydrogen Bonding as the Primary Cause of Structural Stabilization and Rashba Splitting in Hybrid Halide Perovskites 하이브리드할라이드페로브스카이스결정계에서수소결합이구조안성정및라시바현상에미치는영향이준호 *, 이동화, 장현명. 포항공과대학교 The role of hydrogen-bonding (HB) in hybrid halide perovskites is a crucial issue in understanding the structural stabilization of polar octahedron cages and the observed enhanced carrier lifetimes. Herein, we show that the octahedral network in CH 3 NH 3 PbI 3 (abbreviated as MAPbI 3 ), the prototypic hybrid perovskite, is stabilized by the HB interaction between the organic MA cations and the PbI 6 octahedron cage. On the contrary, the Pb-I orbital hybridizations within the octahedron cage give rise to the overall destabilizing effect on the octahedral tilting. In addition, we show that the structural polarization in the PbI 6 octahedron cage is determined primarily by the direction of the dominant HB. On the basis of band-structure calculations, we further show that the Rashba splitting is determined primarily by the polar direction in the PbI 6 cage which, in turn, is determined by the HB interaction. Since the suppression of carrier-recombination rate is intimately connected to the Rashba splitting, the present discovery would greatly facilitate our understanding of the enhanced carrier lifetime in the room-temperature-stable tetragonal MAPbI 3 on the basis of the HB interaction. G8-3 DFT-guided Defect Engineering on Solar Energy Conversion Materials for High Efficiency of TiO 2 제일원리계산을통한효과적인 TiO 2 광변환소재결함제어최희채 *. ( 주 ) 버추얼랩 Defect engineering is one of the longest research topics in field of ceramic materials since defects determines the various properties such as carrier transports, optical transitions, and magnetism. Photocatalytic reaction of a ceramic material is the integral of the optical transition and carrier transport. Therefore, exact understanding in the point defect equilibria and the effects must be given to engineering of photocatalytic material. Density functional theory (DFT) calculations is a powerful tool that gives the exact value of thermodynamic parameters and defect levels in oxide band gaps. In this talk, I will present several examples that DFT calculations could efficiently guide defect engineering and gas mixtures in thermal treatments on doped and undoped anatase and brookite TiO 2 photocatalysts toward highest photocatalytic activities. G8-4 Monte Carlo Simulation on Densification Process of Liquid-phase Sintered Ceramics 액상소결세라믹스치밀화과정에대한몬테카를로시뮬레이션이재욱 *. 재료연구소세라믹스의액상소결과정은액상형성에따른입자재배열, 모세관현상에의한시편수축, 고립기공의소멸등으로구성된다. 이중앞의두단계는시편이소결온도에도달한후수분안에이루어지는반면세번째단계는수시간내지며칠에걸쳐천천히진행된다. 때문에대부분의액상소결연구는세번째단계즉, 고립기공의소멸에대해이루어졌으며특히액상량이극히작을경우어떤현상들이벌어지는지에집중되어있다. 본연구에서는몬테카를로시뮬레이션을이용하여고립기공의소멸과정을모사하였다. 현재까지몬테카를로방법은주로고상소 한국세라믹학회 105

116 2018 년한국세라믹학회춘계연구발표회 결이나액상소결에서의입성장을모사하는데에이용되었는데, 본연구에서는액상내고상과기상의확산을모두고려하여액상소결에서의입성장과기공소멸과정을동시에모사하였다. 2 차원과 3 차원미세조직에서입도분포, 기공크기분포등을조사하였고젖음각 (wetting angle) 의영향을알아보았다. G8-5 A Simulation for Electrostatic Behaviors of Resistive Memory using Finite Element Method 유한요소법을이용한저항메모리의정전기적거동에대한시뮬레이션민경환 *, 권용우. 홍익대학교전이금속산화물을기반으로하는저항메모리의스위칭동작은전도성필라멘트의형성과파괴에의해일어나는것으로알려져있다. 최근, 이러한정전기적거동을해석하기위한많은모델들이제시되어왔는데, FEM (finite element method) 와 DEM (discrete element method) 를이용하여해석하거나, 기형성된전도성필라멘트를토대로열적, 전기적거동에대한해석을진행한연구, 그리고이외에제일원리를이용한결함형성에대해연구한많은사례들이있다. 본연구에서는 FEM만을이용한적은컴퓨팅자원을통해시뮬레이션하는모델을수립하였다. 먼저, 산화물과결함이형성된부분을두개의상 (phase) 로해석하고자하였고, 결함형성에있어전기장의크기에비례하는스위칭모델을적용하였다. 본발표에서는수립한 FEM simulation에대해자세히설명하고, 금속산화물의물성값에따른스위칭특성을살펴볼것이다. 또한, 결함형성의무작위성 (randomness) 를반영한모델로써, forming voltage의산포역시다뤄질예정이다. G8-6 Computer Simulation Study to Improve Analog Characteristics of Phase-change Memory 상변화메모리 (Phase-change memory) 의아날로그특성향상을위한전산모사연구신민규 *, 권용우. 홍익대학교인공지능하드웨어기술중인간의신경세포의기능을모사하는뉴로모픽컴퓨팅칩기술이기존 von Neumann 구조와비교했을때에너지효율측면에서많은연구가진행되고있다. 뉴로모픽소자의구성요소중에시냅스소자는뉴런소자간의연결과가중치를담당하는데, 이러한시냅스소자를위한메모리로써상변화메모리가많은수의중간상을통해실제시냅스의아날로그적인신호를표현할수있어기존의실리콘기반메모리에비해이점을가질수있다. 본연구에서는상변화메모리가가지는아날로그특성을향상시키기위해구조및상변화물질의특성을변화시켜가며전산모사를진행했다. 소자의구조에대한영향성은 confined type과 line & space type을비교하여아날로그특성의향상에유리한구조를분석해보았다. 상변화물질의특성은결정질상태의비저항과열전도도를변화시켜가며 transition 영역과 on/off ratio 에미치는영향에대해분석을하였다. 이러한분석들을바탕으로시냅스소자를위한상변화메모리의구조와상변화물질의재료엔지니어링의방향에대해제안하고논의하고자한다. S81-1 Ab initio Study for Native Defects in PbTe PbTe 의고유결함에대한제일원리연구박성진 1*, 이민호 2, 류병기 1. 1 한국전기연구원, 2 Leibniz Institute for Solid State and Materials Reserarch Dresden PbTe is very noteworthy thermoelectric material at intermediate temperatures. Most investigations of PbTe were mainly focused on PbTe-based ternary or quaternary alloys to control band convergence, formation of resonant level, and nanostructuring. However, the intrinsic nature of PbTe is still not well understood yet. The semiconductor type of PbTe-related alloys is known to be determined by the Pb concentration with respect to the Te concentration. In binary, Pb-rich or Te-rich condition typically exhibits n-type or p-type behavior, respectively. It also affects the electrical behavior of ternary or quaternary PbTe-based alloys. In PbTe, our experimental results show that 10% excess-pb doping merely affect the lattice parameter (~ +0.3%). To understand such an off-stoichiometry behavior and its electric behavior in binary, we theoretically investigated the formation of native vacancies and interstitials in PbTe. We suggest that the formation of Pb interstitial or Te vacancy defects might be responsible for the off-stoichiometry in PbTe. S81-2 First Principles Study on Optical and Electrical Properties of BaSnO 3 BaSnO 3 의전기및광학적성질에관한제일원리계산연구강영호 *. 한국재료연구소 The cubic perovskite BaSnO 3 (BSO) has emerged as a particularly promising wide band gap oxide for numerous technological applications such as photovoltaics, light-emitting diodes, flat-panel display, and touch screen. The electrical conductivity of BSO is highly tunable by doping (controlled doping up to n ~ cm 3 has been achieved). In addition, its room-temperature mobility has been reported to exceed 300 cm 2 /Vs even for n > cm 3, which surpasses mobility records of well-known conducting oxides such as Sn doped In 2 O 3 and Al doped ZnO. Despite outstanding properties of BSO, their fundamental understanding is still lacking. In this study, we investigate electrical and optical properties of BSO using first principles calculations. The electron mobility is calculated in a fully predictive manner taking into account electron-phonon and impurity scattering, which provides physical insights into the excellent transport ability of BSO. We also evaluate the optical absorption. By comparing with experiments, we shed light on the variety of bandgap values that have been previously reported, concluding that the indirect gap is 2.98 ev and the direct gap is 3.46 ev. S81-3 Influence of Alloying Elements on the Martensite Start Temperature of High Manganese Steel 고망간강마르텐사이트변태시작온도에미치는합금원소영향장재훈 *. 창원재료연구소목표하는미세구조와물성을만족시키는합금을설계하는것은다양한합금원소들과열처리조합에서하나를선택하는과정으로많은시간과비용을필요로한다. 따라서, 합리적인물리야금학모델을통해각원소가조직과물성에미치는영향을정확히예측하는것은새로운합금을설계하는데있어이러한시간과비용을줄여줄수있다. 그예로, 고망간강에서마르텐사이트변태시작온도에미치는각원소효과를이해하려는시도는열처리후미세조직및 TRIP, TWIP 등의변태기구와밀접한관련성이있어다양하게진행되어왔다. α''''-마텐사이트의경우에는다양한실험측정치와열역학방법으로부터변태시작온도를예측하는모델이제안되어활용되고있으나, ε-마르텐사이트의경우에는성분범위나정확도의측면에서열역학데이터의제약으로인해적용에어 106 한국세라믹학회

117 포스터 발표 I 107

118

119 포스터발표 I P1-G1-1 Study on Al-Si-C-O Insulation Coating of Soft Magnetic Metal Powders 연자성금속분말의 Al-Si-C-O 절연체코팅에관한연구오혜령 *, 양형우, 이우성. 전자부품연구원 Soft magnetic composites (SMCs) are important in inductors and transformers applications due to high permeability and low eddy current loss at high frequencies. The annealing process in SMCs core fabrication is essential to eliminate the residual stress. Accordingly, the insulating material should have a high thermal stability. In this study, the formation of chemical bonding with Al-Si-O-C layer in the magnetic powder gives rise to improved thermal stability. The ceramic coated layer with Al-Si-O-C component were used for the insulation layer of metal powder, and the magnetic material with ceramic insulated layer were obtained by glass reaction with reduced the resistivity. P1-G1-2 Effect of Complex Substitution on Microwave Dielectric Properties of Mg 2 Ti 1-x (Ni 1/3 Sb 2/3 ) x O 4 (0.05 x 0.3) Ceramics Mg 2 Ti 1-x (Ni 1/3 Sb 2/3 ) x O 4 (0.05 x 0.3) 세라믹스의복합치환이마이크로유전특성에미치는영향박윤식 *, 김응수. 경기대학교 Microwave dielectric properties of Mg 2 Ti 1-x (Ni 1/3 Sb 2/3 ) x O 4 (0.05 x 0.3) ceramics were investigated. For the specimens sintered at 1400 for 4h, single phase with inverse-spinel structure was observed through the entire range of compositions. Although the dielectric polarizability of (Ni 1/3 Sb 2/3 ) 4+ (4.08 Å) was larger than that of Ti 4+ (2.93 Å), the dielectric constant (K) of the specimens was decreased with increasing x due to the larger ionic size of (Ni 1/3 Sb 2/3 ) 4+ (0.63 Å) than that of Ti 4+ (0.605 Å). These results could be attributed to the rattling effect which describe the large ionic size reduce the dielectric constant. In addition, dielectric constant (K) of Mg 2 Ti 0.5 (Ni 1/3 Sb 2/3 ) 0.5 O 4 ceramics was enhanced from ε r ~ 14 to ε r ~ 9.45 with no significant degradations of Qf value. Qf values of the specimens decreased with the increase of x. However, Qf values above 100,000 GHz and K below ε r ~ 10 were obtained with complex substitution of (Ni 1/3 Sb 2/3 ) 4+ for Ti 4+ of Mg 2 Ti 1-x (Ni 1/3 Sb 2/3 ) x O 4 (0.05 x 0.3) ceramics, which could be applied to the communication systems. P1-G1-3 Microwave Dielectric Properties of Mg 4 Ta 2 O 9 -based Ceramics with Substitution of (Li 3/4 Ta 1/4 ) 2+ for Mg 2+ sites Mg 2+ 자리에 (Li 3/4 Ta 1/4 ) 2+ 치환에따른 Mg 4 Ta 2 O 9 계세라믹스의마이크로파유전특성조현우 *, 김응수. 경기대학교 Dependence of microwave dielectric properties on the substitution of (Li 3/4 Ta 1/4 ) 2+ for Mg 2+ -site of Mg 4-x (Li 3/4 Ta 1/4 ) x Ta 2 O 9 (0 x 0.1) were investigated at microwave frequencies. For the Mg 4-x - (Li 3/4 Ta 1/4 ) x Ta 2 O 9 specimens sintered at 1350 o C for 5 h, the single phase of Mg 4 Ta 2 O 9 was detected up to x = mol, while the secondary phase of MgTa 2 O 6 was observed along with the main phase of Mg 4 Ta 2 O 9 for further substitution of (Li 3/4 Ta 1/4 ) 2+ for Mg 2+. With substitution of (Li 3/4 Ta 1/4 ) 2+ ions for Mg 2+ site, the quality factors (Qf ) were increased and showed the highest value (Qf = 230,000 GHz) at x = mol due to the increase of Ta-O bond strength. However, the quality factor (Qf ) decreased for the specimens with higher content (Li 3/4 Ta 1/4 ) 2+ above x = mol due to formation of secondary phase MgTa 2 O 6. Dielectric constant (K) of Mg 4-x (Li 3/4 Ta 1/4 ) x Ta 2 O 9 were not changed remarkably with compositional changes. The relationship between Ta-O bond strength and microwave dielectric properties were also discussed. P1-G1-4 Structural Characteristics and Microwave Dielectric Properties of Mg 4 (Nb x/8 Ta y/8 Sb z/8 ) 2 O 9 Ceramics Mg 4 (Nb x/8 Ta y/8 Sb z/8 ) 2 O 9 세라믹의구조적특성및마이크로파유전특성김재민 *, 김응수. 경기대학교 Microwave dielectric properties of Mg 4 (Nb x/8 Ta y/8 Sb z/8 ) 2 O 9 (1 x, y, z 5) ceramics were investigated with the structural characteristics by the Rietveld refinement. For the Mg 4 (Nb 4/8 Ta 2/8 Sb 2/8 ) 2 O 9 specimen sintered at 1400 o C for 5h, a single phase with a corundum structure was detected and high quality factor (376,000 GHz) was obtained. The microwave dielectric properties of the specimens were dependent on the relative ratio changes of B-site ions (Nb 5+, Ta 5+, Sb 5+ ) of Mg 4 B 2 O 9, which could be attributed to the structural characteristics with the types of B-site ions (Nb 5+, Ta 5+, Sb 5+ ). Dielectric constant (K) of Mg 4 (Nb 2/8 Ta 2/8 Sb 4/8 ) 2 O 9 was 9 which is lower than 11~12 of typical Mg 4 Nb 2 O 9 ceramics with corundum structure. Based on the structural characteristics of corundum structure with the relative ratio of B-site ions (Nb 5+, Ta 5+, Sb 5+ ) of Mg 4 B 2 O 9, the relationships between the microwave dielectric properties and the structural characteristics were also discussed. P1-G1-5 Electrical Pattern-incorporated Photo-curable Inorganic/Organic Composites 전도패턴이결합된광경화성유무기복합소재윤재영 1*, 양현승 2, 박성대 2, 이우성 2. 1 경기대학교, 2 전자부품연구원최근 3D 프린팅기술을이용하여다양한형태의맞춤형웨어러블기기를생산하려는시도가활발히진행되면서 3D 프린팅용소재도주목을받고있다. 여러 3D 프린팅소재중에서도광경화형고분자소재는우수한성형성때문에많이쓰이고있는추세이다. 광경화형고분자를이용한웨어러블기기제작을위해서기존에는전도성잉크를이용한전도패턴을구현하였지만, 가격및복잡한공정면에서한계를가지고있다. 본연구에서는전도도금패턴형성에활용가능한무기세라믹입자가복합된광경화성유무기복합소재를제조하였다. 특히, Photo DSC 및 UV 흡광도측정을통해서광경화성 3D 프린팅공정에적합한무기입자를선택하였고, 무기입자의종류및함량에따른전도패턴구현특성을확인하였다. 또한 Tape peel test을이용하여전도패턴이결합된 3D 프린팅용광경화성소재의기계적안정성도확인하였다. P1-G1-6 Synthesis of Layered-structured Mn 5 O 8 Nanowires by Electrospinning and its Electrochemical Properties 전기방사법에의한층상구조를갖는 Mn 5 O 8 나노와이어합성및전기화학적특성평가한진주 1*, 송찬근 1, 원종한 2, 윤종원 1. 1 단국대학교, 2 한국기초과학지원연구원금속산화물중의사캐패시터 (pseudo capacitors) 에널리상용되고있는망간산화물의경우전기용량의이론적값이 800 F/g로매우높게알려져있다. 본연구에서는 1차원나노구조체를비교적간단히제작할수있는전기방사법을활용하여망간산화물 1차원나노와이어를제작하고 300 o C부터 500 o C까지열처리온도를다르게합성 한국세라믹학회 109

120 2018 년한국세라믹학회춘계연구발표회 하였다. 열처리온도에따른망간산화물의결정구조, 미세구조및화학양론조성평가를수행하였다. FESEM 을통한미세구조분석결과나노와이어의평균직경은 200~300 nm 로확인되었으며, X 선회절분석을이용하여결정구조를분석한결과 500 o C 열처리시료의경우 Mn 2 O 3 단일상이었으며, 400~350 o C 열처리시료의경우 Mn 5 O 8 상이지배적이고일부 Mn 2 O 3 가혼재된상으로확인되었고, 한편 320 o C 열처리시료에서는 Mn 5 O 8 단일상이확인되었다. 또한 300 o C 열처리시료의경우 Mn 5 O 8 및 Mn 3 O 4 가혼재된상으로확인되었다. 본발표에서는망간산화물의열처리온도별결정상에따른의사캐패시터적용가능성을검토하고자전기화학적특성평가인삼전극법을활용한순환전류전압 (CV) 측정, 임피던스측정및직류충방전 (GCD) 특성평가의결과를발표하고자한다. P1-G1-7 Influence of A-site Cations Ordering on the Electric Properties of BNT Lead-free Piezoceramics BNT 무연압전세라믹스의 A-site 양이온배치가전기적특성에미치는영향이주현 1*, 홍창효 1, 안창원 2, 조욱 1. 1 UNIST, 2 울산대학교 Previously, we attempted to control the degree of oxygen octahedral tilting by adjusting A-site deficiency levels for some selected compositions in (1-x)Bi 1/2 Na 1/2 TiO 3 -xbatio 3 (BNT-BT) system, i.e., (Bi 1/2 ) 1-x Ba x [(Na 1/2 ) 1-x ] -y TiO 3 (x = 0, 6, 9, 13, 40 and y = 0, 1, 2, 4 representing the level of deficiency). Two interesting aspects were observed: 1) The intensity of random fields (RFs) does not seem to be affected in pure BNT despite the presence of oxygen octahedral tilt system, and 2) A development of RFs is evident in BNT-40BT system, though the crystallographic symmetry of this composition prohibits any oxygen octahedral tilting. In addition, The effect of B- site cations ordering is evident in Pb(Sc 1/2 Ta 1/2 )O 3 system (N. Setter, 1980[1]). So, I wonder that we can control the order of A-site ions in the pure BNT system which shown any intensity of RFs despite the presence of oxygen octahedral tilt system. We tried to control the degree of A-site ions order in pure BNT system by thermal annealing. After sintering at 1150 o C for 2.5 h, each (Bi 1/2 )(Na 1/2 ) 1-x TiO 3 (x = 0, 4, 5) samples was annealed by three conditions 1) 700 o C for 24 h, 2) 800 o C for 24 h, 3) 700 o C for 100 h. As a result, some new peak appear in front of (001) peak in XRD data of 700 o C for 100 h annealing condition. Also, In high electric field measurement, relaxor property that is incipient piezoelectricity appears as increase A-site deficiencies. In this presentation, we would like to present the data of relevance to these results. P1-G1-8 Corrosion Behavior of Cu-Fe Alloy Flake Coated with Complex Solution Consisted of Ferrous and Nonferrous Metallic Corrosion Inhibitor 철금속및비철금속방청제로구성된혼합용액으로코팅된 Cu-Fe 합금 Flake의부식거동박수영 1*, 전명표 1, 배동식 2. 1 한국세라믹기술원, 2 창원대학교 Corrosion inhibitor solution is a chemical solution composed of silica nanoparticles, binder and solvent and plays a role of reducing its corrosion rate. Cu-Fe alloy flakes will be weak to corrosion due to their iron composition and small particle size. The effect of a mixed rust inhibitor on the corrosion of CuFe alloy flake was investigated using complex solutions consisted of a ferrous and a nonferrous metal rust inhibitor based on SiO 4 and SiO 2, respectively. The ratios of ferrous and nonferrous inhibitor solution are 7 : 3, 6 : 4, 5 : 5 and 4 : 6, respectively. Cu-Fe alloy flakes coated with the mixed rust inhibitor solution were placed in ph 2, ph 4 solution, respectively at 25 o C and 80 o C. After 24 and 48 h, the corrosion status was examined with XRD, SEM/EDS and FT-IR. P1-G1-9 Influence of the Water Quenching Process on the Electrical Properties of Sm-modified Bismuth Ferrite based Ceramics 사마륨이첨가된비스무스페라이트세라믹의물을이용한급속냉각에따른전기적특성무하마드하비브 *, 이명환, 김다정, 최해인, 송태권, 김명호, 김원정. 창원대학교 Bismuth ferrite based bulk ceramics (1-x)Bi 0.92 Sm 0.08 FeO 3 -xbatio 3 (BSF-BT, x = ) have been synthesized by conventional solid-state reaction method followed by water quenching process. The water quenching procedure dramatically enhanced the remnant polarization (P r ) from 11.5 μc/cm 2 to 21 µc/cm 2 and also for 3 mol% of BaTiO 3 addition the coercive field (E c ) significantly reduced and its corresponding P r value reached to 28.5 µc/cm 2. The well-saturated P - E loops with such a high P r value for the first time have been reported in Sm-modified BiFeO 3 bulk ceramics. The temperature dependent polarization revealed that the corresponding P r values were improved, this behavior may be related to the thermally activated domain walls motion. In addition, at optimum composition (3 mol%) maximum static and dynamic piezoelectric constant d 33 = 47 pc/n and d 33 * = 38 pm/v were observed. The structureal and electrical properties of BSF- BT ceramics will be presented in detail. P1-G1-10 Piezoelectric Ceramic Composition for Cu MLCA Cu MLCA용압전세라믹조성최정식 1*, 신효순 1, 이창현 2, 여동훈 1, 이준형 3. 1 한국세라믹기술원, 2 고려대학교, 3 경북대학교다층의압전세라믹시트로구성된 MLCA (Multilayer Ceramic Actuator) 는고정밀엑츄에이터로써반도체장비, 자동차등전산업부분에서핵심적인부품으로다양하게사용되고있다. 현재상용화되고있는 MLCA는 Ag-Pd 같은고가의내부전극을사용하기때문에적층수가많은엑츄에이터의경우가격경쟁력을높이기위하여 Cu, Ni 등과같은저가의내부전극을적용하기위한연구가필요하다. 그러나기존의 MLCA에서사용되는 Pb계열의세라믹시트는 1200 o C 이상의높은소결온도를지니고있는반면 Cu 내부전극은 900 o C~1000 o C에서소결되기때문에세라믹소재와전극의동시소결이어렵다는단점이있다. 또한산화분위기에서소결시내부금속이산화반응이일어나므로 Cu 내부전극을사용하기위해서는 1000 o C 이하의저온소결특성을지니며, 내부전극이산화되지않는분위기에서소결이진행되어야하며, 이때세라믹시트는산화물상태로유지되어야한다. 따라서본연구에서는 Pb계열의압전세라믹스에첨가제를추가하여소결온도를 900 o C~1000 o C에서형성하며, d 33 및 k p 가 400 (pc/ N), 50 (%) 이상에해당하는특성을얻고자하였다. 또한소결시질소와수소가스의유량을변화시켜산소분압을조절하여, 내부전극은산화되지않는상태에서충분한압전특성이유지될수있도록하는데목적을두었다. 110 한국세라믹학회

121 포스터발표 I P1-G1-11 Hybrid Flexible Nanocomposite Energy Harvester based on Perovskite Nanostructures-employed Piezopolymer 유-무기하이브리드압전나노소재기반의플렉서블에너지하베스팅소자박귀일 1*, 정창규 2, 현동열 1, 박현빈 1. 1 경남과학기술대학교, 2 전북대학교 Energy harvesters which can convert electrical energy from vibrational and mechanical energy sources are very promising tools to realize the sustainable energy generation in isolated, inaccessible or indoor environments and even in human body condition. Mechanical energy harvesting technologies have been developed in various ways to support or power small-scale electronics. Nevertheless, the strategy for enhancing current and charge performance of flexible piezoelectric energy harvesters using a simple and cost-effective process is still a challenging issue. Herein, we develop fully-piezoelectric nanocomposite using perovskite nanostructures-employed poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) for a highperformance hybrid nanocomposite generator (hncg) device. Inorganic piezoelectric nanomaterials were synthesized via a facile hydrothermal reaction. The hybrid-pizoelectric composite was produced by dispersing the inorganic piezo-materials into organic P(VDF-TrFE) piezo-polymer. Finite element analysis method simulations study that this outstanding performance of hncg devices attributes to not only the piezoelectric synergy of piezo-ceramics and within P(VDF-TrFE) matrix but also the effective stress transferability of piezopolymer. We also characterized the output performance of flexible hncg under the periodic bendings and demonstrated the practical application by using the generated electricity from a flexible energy harvester. P1-G1-12 Improved Bending Fracture Behavior of Graphene- Intervened Flexible Oxide Thin Films 그래핀적용에따른유연산화물박막의굽힘파괴거동의향상최홍제 *, 김다빈, 조용수. 연세대학교 We introduce the improved bending fracture resistance of flexible inorganic thin films by incorporating a large-scale graphene monolayer, using a typical example of transparent conducting Al-doped ZnO (AZO) thin films. A graphene monolayer of ~1 cm 1 cm scale was successfully transferred onto a flexible polyethylene terephthalate (PET) substrate prior to the sputter-deposition of thin films with variable film thickness from 50 nm to 200 nm. The highlights of the substantial improvements are the crack-initiating strain of 1.64% and the fracture energy of Jm 2, which were obtained for the graphene-intervened 200 nm-thick AZO films. The values correspond to respective improvements of ~61% and ~272% compared to the reference sample without graphene. P1-G1-13 Plasmonic-Enhanced Luminescence Using an ZnO Nanorod-Array for White Light-Emitting Diodes 백색 LED용플라즈모닉증강 ZnO 나노로드-어레이권오현 *, 장진우, 정예슬, 조용수. 연세대학교 A novel remote phosphor approach is introduced here to enhance luminescence properties by combining a waveguiding ZnO-based nanostructure with plasmonic Au nanoparticles. The system is based on a micro-scale yellow phosphor layer printed onto an Au nanoparticle-dispersed ZnO nanorod array. This structure induces a substantial enhancement in luminous efficacy of ~19% due to the combined waveguide effects with Au-plasmonic effects. The length of the Zn nanorods and the concentration of Au are varied for optimal luminescence performance. A promising efficiency of ~84.26 lm/w is achieved for a silicate phosphor-converted LED consisting of long ZnO nanorods with a proper concentration of Au. P1-G1-14 Inhomogeneous Sn Distribution in ITO and its Phase Relations ITO 소결체내 Sn의불균일한분포와상관계오성욱 1*, 김도겸 1, 유춘석 2, 허용혁 2, 김영기 3, 허영우 1, 김정주 1, 이준형 1. 1 경북대학교, 2 희성금속 ( 주 ), 3 UNIST ITO 박막의제조는소결타겟을스퍼터링하여박막을제조하는방법이가장널리사용되고있다. 이때 ITO 타겟내 Sn의함량은약 9.3 at% 가첨가된것이보편적으로사용된다. 평형상태를가정한상태도에의하면 In 2 O 3 내 SnO 2 의고용량은 1500도에서약 5~6 at% 미만, 1000도부근에서는약 2 at% 미만의고용한계를가지기때문에소결체는 Sn-rich 상 (In 4 Sn 3 O 12 상 ) 과같은 2차상의생성을필수적으로동반하게된다. 따라서약 9.3 at% 가첨가된 ITO 소결체는 In 4 Sn 3 O 12 상과 Sn이균일하게고용된 ITO 상 (bixbyite 구조 ) 으로구성되는것으로받아들여져왔다. 본연구에서는 ITO 입자내부에서도 Sn의분포가균일하지않으며, Sn의함량이 20~24 at% 에이르는약 100~200 nm 크기의입자들이다량생성됨을발견하였다. 이러한 Sn 과량나노입자들은 X- ray diffraction (XRD) 분석으로검출되지않을뿐아니라 TEM의 SAED 분석으로도 ITO 모상과의구조유사성으로인하여검출이까다로웠다. 본연구에서는 HRTEM 분석을통하여 ITO 모상과 Sn 과량나노입자와의결정구조상관관계를규명하였으며, 이를통하여 In 2 O 3 - SnO 2 상발달관계에대한이해의폭을넓힐수있었다. P1-S13-1 Al- and Ga-doped HfOx Thin Film Deposition for Resistive Switching Memory 저항변화메모리를위한 Al 또는 Ga이도핑된 HfO x 박막의원자층증착법류성연 1*, 오승익 1, 남효원 1, 박우영 2, 김수길 2, 최병준 1. 1 서울과학기술대학교, 2 SK하이닉스 Bipolar type resistive switching random access memories (RRAMs) are utilized by HfO x thin film. It has been reported that crystalline HfO 2 film could not create enough oxygen vacancies for resistive switching. Crystalline HfO 2 RRAM may cause even higher forming voltage, which in turn, device variability could be worse or even catastrophic breakdown could be happen. To change the structure of the film, defect engineering by doping has been deliberately investigated by using various methods, such as, co-sputtering, implantation, thermal and photo-assisted diffusion, etc. In this study, Al- and Ga-doped HfO x films are grown by using atomic layer deposition (ALD) to change the structural and chemical properties of HfO 2 film. Tetrakis(ethylmethylamino)hafnium (TEMAH), trimethyl aluminum (TMA), and cyclic dimethylamide complex DMG (Ga(NMe 2 ) 3 ) 2 are used as Hf, Al, and Ga precursors, respectively. Dopant concentration and location are controlled by the ALD cycle ratio and sequence. Structure and chemical states of the films are investigated. In addition, the resistive switching characteristics caused by internal structure of Al- and Ga-doped-HfO 2 한국세라믹학회 111

122 2018 년한국세라믹학회춘계연구발표회 films are compared with that of HfO 2 -based resistive switching memory device. This paper was result of the research project supported by SK hynix Inc. P1-S13-2 Low Operating Voltage, Electroforming-free, and Selfrectifying Characteristics of Pt/HfO 2 /Ti Crossbar Array Device 저전압구동과자기제어특성을갖는 Pt/HfO 2 /Ti 크로스바어레이소자김용 *, 정원희, 윤희주, 한정환, 최병준. 서울과학기술대학교 Recently, interest in crossbar array (CBA) is growing to improve functionality in memory devices. However, there are some issues as implementing memristor with CBA structure. For example, memristor requires the electroforming process, which demands excessive drive circuit, and additional selector is needed to reduce the sneak path problem. In this study, we have developed electroforming-free memristor with rectification functionality to help alleviate these problems. A device with Pt/HfO 2 /Ti stack was fabricated. The HfO 2 thin film is deposited using atomic layer deposition (ALD) used as resistance switching (RS) layer. During this process, TiO x layer is formed between Ti and HfO 2 because of thermal process under oxygen-rich atmosphere in chamber. This layer acts as a barrier for electron injection, which plays an important role in the self-rectifying behavior. The RS behavior of fabricated device in CBA shows forming-free and low operating voltage for set and reset switching, respectively. As a result, we demonstrate the selector-free memristive CBA through selfrectifying characteristics. P1-G2-1 Analysis of Crystal Structure, Electrical Conductivity, and ASR Characteristic of Ca Substituted into Layered Perovskite for Cathode Materials of IT-SOFC 고체산화물연료전지공기극으로사용되는 Layered Perovskite에 Ca 치환에따른결정구조, 전기전도도및면적비저항특성분석김정현 1*, 우성훈 1, 추슬기 1, 신태호 2. 1 한밭대학교, 2 한국세라믹기술원고온영역에서운전되는고체산화물연료전지 (Solid Oxide Fuel Cell) 는세라믹전극의활성화에의해높은전력밀도를보이는장점이있으나금속재료및세라믹전극의열적퇴화의문제점이발생하고있다. 본연구에서는 AA B 2 O 5+δ 구조의 SmBa 0.5 Sr 0.5 Co 2 O 5+δ (SBSCO) Layered Perovskite 조성을이용하여단계적으로 Strontium (Sr) 을 Calcium (Ca) 으로치환한 Layered Perovksite 을합성하여산화물의결정구조특성, 온도에따른전기전도도및면적비저항특성을분석하였다. P1-G2-2 Phase Synthesis and Electrochemical Properties of Pr and Sm Substituted into Layered Perovskites AA B 2 O 5+δ Layered Perovskite구조에 Pr 및 Sm 치환에따른상합성및전기화학특성김정현 1*, 우성훈 1, 추슬기 1, 신태호 2. 1 한밭대학교, 2 한국세라믹기술원고체산화물연료전지는고온영역에서운전될경우공기극의크롬피독현상및스택의밀봉, 분리판금속의내구성및열적퇴화등의다양한문제를가지고있다. 최근에는이러한문제를해결하기위하여국내외의많은연구기관에서는실용적인측면과상용화에유 리한중 저온형고체산화물연료전지연구에많은노력이진행되고있다. 본연구에서는 Pr 을 A Site 에치환한 Layered perovskite 를상합성하였으며이에따른전기화학특성을분석하였다. P1-G2-3 Highly Efficient Electrochemical Synthesis of Ni Nanoparticles-dispersed Ceria Nanostructures for High-temperature Electrocatalyst 전기증착을통한고효율의니켈나노입자가분산된세리아나노구조체고온전기화학촉매합성김진욱 *, 최윤석, 정우철. KAIST Lowering operation temperature of solid oxide electrochemical cells (< 700 o C) is crucial to overcome longstanding cost barriers by extending the choice of materials and lifetime with minimal thermal degradation. However, decreased performance due to the increased electrode overpotential at reduced temperature is one major problem to be addressed. Highly active metal nanoparticles (NPs) have become desired to develop high performance electrode at reduced temperature by uniformly dispersing on the mixed ionic and electronic conducting oxides such as doped ceria, which is a prerequisite for effective electrochemical reactions. While it has become evident that nanoscale architecturing can provide further improvement due to the high density of active sites corresponding to metal/ceria interfaces, the practical fabrication methods for such complex structures are not easily available. In this study, we present a cost-effective, simple electrochemical synthetic route of metal NPs-dispersed ceria nanostructures. We successfully controlled not only ceria support microstructures but also the size and distribution of supported metal NPs by varying the process variables such as applied potentials or deposition time. Finally, we demonstrated the dramatic enhancement of electrochemical activity of Ni/YSZ anodes with electrochemically prepared electrocatalytic layers. P1-G2-4 High-temperature Methane Oxidation of Pt@SiO 2 Core-shell Catalyst with Long-term Stability 장기안정성을갖는 Pt@SiO 2 코어-쉘촉매의고온메탄산화반응김승현 *, 이시원, 정우철. KAIST Recent improvements in colloidal synthesis have made it possible to synthesize morphologically well-defined metal nanoparticles for catalytic applications. Due to their high reactivity and advantage in high surface-to-volume ratio, metal nanoparticles have been widely used as a catalyst for hydrocarbon reforming and automobile exhaust control. These industrially significant reactions usually require hightemperature conditions. However, under high temperature, metal nanoparticles loses the advantages due to particle aggregation. Agglomeration causes surface area loss and in turn, leads to degradation of catalytic activity. Core-shell structure has been proposed lately to physically shield metal nanoparticles from agglomeration. However, most studies are focused on the synthetic method, and there are limited studies on an actual catalytic test of core-shell catalysts in high-temperature conditions. Here, we this study have prepared a Pt@SiO 2 catalyst, confirmed its thermal stability in temperature up to 650 C and made physical characterizations using TEM, XRD and CO chemisorption. More importantly, we conducted a high-temperature methane oxidation at 550 C with the core-shell catalyst, and it showed decent and stable 112 한국세라믹학회

123 포스터발표 I long-term activity compared to conventional supported type catalyst. These observations provide the possibility of the core-shell particles as a candidate for catalyst in real high-temperature reactions with both stability and activity. P1-G2-5 Long-term Stability Enhancement and Development of Reversible Solid Oxide Fuel Cell 가역운전고체산화물연료전지의수소극장기성능향상및기술개발신재화 *, 이민진, 황해진. 인하대학교고체산화물전해셀 (solid oxide electrolysis cell, SOEC) 은고온에서수증기를전기분해하여수소를제조하는전기화학디바이스이다. SOEC는고체산화물연료전지 (SOFC) 의역반응을활용하는기술로서필요에따라수소로부터전기를생산하기도하고전력으로부터수소를제조하는차세대전력생산및저장시스템에활용을목적으로하고있다. 한편 SOEC는수소극에고온 / 고압의수증기를공급한다는점과공기극에서는산소가매우빠르게방출된다는점때문에 SOFC에비하여셀및스택의열화가크고상업화의걸림돌이되고있는상황이다. 본연구에서는 SOEC의수소극성능및열화에미치는작동조건의영향에대하여연구하였으며, 수소극의내구성을향상하기위하여 Ni/YSZ의산화를억제하는소재기술을검토하였다. 수소제조용셀은공기극으로 LSCF를, 수소극으로 Ni-YSZ 사용하여구성하였고전해질 (YSZ) 및전극지지형셀을제조하여실험에사용하였다. 제조한셀에대하여 SOFC/SOEC 모드에서의분극저항과 j-v 특성을평가하였다. 셀에 0.1 A/cm 2 의전류밀도를인가한상태에서 10, 30, 50% 의수증기분압변화에따라전압의변화를관찰하였으며 SOFC-SOEC 전환운전에따른전압의변화를측정함으로써셀의내구성을평가하였다. 또한수증기분위기에서의수소극 (Ni-YSZ) 의산화를억제하기위하여방식 (anti-corrosion) 기술을응용한금속복합화수소극을제조하였고, Ni의산화억제에따른미세구조의안정성과장기내구성의향상을확인할수있었다. P1-G2-6 Development of Environment-friendly Building Materials Using Bottom Ash 바텀애쉬를이용한친환경건축자재개발및특성분석이유진 *, 양현경. 부경대학교전력수급에이용되는주요발전설비로는화력, 수력, 원자력, 태양력, 육 해상풍력등이있으며그중석탄화력발전의의존도는매우높은상황이다. 석탄의수요는전세계적으로 2000년대이후꾸준히증가하는추세이며, 이와함께배출부산물 폐기물인석탄회의배출량도늘어나고있으며국내배출량은연간 800만톤이상이다. 화력발전소에서발생하는폐기물인소각회는바텀애쉬와플라이애쉬로구분할수있다. 석탄재발생량중대부분을차지하는플라이애쉬는콘크리트용혼화재나시멘트 2차제품의원료등으로활발히재활용되고있다. 바텀애쉬는석탄이화력발전소에서연소될때괴상또는입자의크기가큰회성분이보일러하부로떨어진것으로석탄재발생량의약 10% 를차지한다. 바텀애쉬는아직까지활발히재활용되지못하고있는실정이다. 이러한문제를해결하기위해바텀애쉬를이용한친환경건축자재를연구개발중이다. 바텀애쉬를주재료로하였으며, 첨가제와바인더로각각활성탄, 물유리를사용하였다. 안정적인지지체형성을위해정량, 혼합, 발포후건조과정을통해제작되었으며탈취효율및압축강도를측정, 분석하였다. 이를통해탈취기능을갖는건축자재로서의활용가능성을기대해볼수있다. P1-G2-7 Study on the Characteristic of Mine Liner and Cover Material Containing Polymer Resin 고분자수지를혼합한광산차수재의특성연구조용광 1*, 남성영 1, 김춘식 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원폐광산을안정화시키기위해폐석, 산업부산물등을갱내에충전시켜지반안정화를시키고있으며, 현재다양한충전재의연구가진행되고있다. 그러나충전재의경우산성배수및침출수로인한토양오염등 2차적인오염은제대로억제하지못하는문제점을가지고있다. 따라서유출되는물질로인해주변환경에미치는영향을최소화하고차수층의재료가갖는유해금속및유기물질이동을억제하기위해차수층을설치한다. 이러한차수재는침출수누수를억제할수있도록기능을가지기위해서는저투수성을가져야한다. 따라서, 저투성광산차수재를제조하기위해고분자수지인 etyhene vinyl acetate(eva) 분말수지를혼합하여제조하였다. EVA 수지는방수성, 내구성이우수하여여러산업에서다양하게활용되고있다. 본연구에서는시멘트와골재사이의공간을 EVA 고분자필름으로채워기초물성향상및수밀성향상을통해차수성능을향상시키고자하였다. 연구결과 EVA 분말수지 4% 까지는휨강도, 압축강도, 건조수축안정성등기초물성이향상되는것을확인하였다. 하지만 EVA 분말수지 5% 를사용할경우물성이크게향상되지못하거나, 4% 대비감소하는것을확인하였다. 투수계수측정결과 에서 까지저투수성이발현되어차수성능이향상되는것을확인하였다. 이논문은 2017년도정부 ( 과학기술정보통신부, 환경부, 산업통상자원부 ) 의재원으로한국연구재단-탄소자원화국가전략프로젝트사업의지원을받아수행함. (2017M3D8A ) P1-G2-8 Ceramic Slurry Properties and Surface Modification Experiments for Quartz Tube Inner Layer Coating 쿼츠튜브내면코팅용세라믹슬러리용액의물성특성과표면개질실험정경채 *, 오석진, 박정용. 한국원자력연구원차세대원자로로고려되고있는고속로에서는핵연료로 U-Zr합금을기반으로하는금속연료를기본연료로예정하고있으며, 사용후연료의재활용관점에서 U-Zr-TRU-RE합금의사용도고려하고있다. 연료제조과정은 fuel rod( 연료심 ) 제조를기본으로, 피복관개발과더불어핵연료의성능평가가동시에이루어지고있다. 연료심제조공정개발과관련된사항으로, 연료심의제조과정은다음과같다. 먼저원자로로심에서사용될금속연료의조성이결정되면, 로심의특성에따라적절한조성을갖는금속원료물질들을선정, 정확한구성원소비율로배합, 고온, 진공분위기에서용융한후, 중력 ( 사출 ) 주조과정을거쳐적당한직경과길이를갖도록연료심이제조된다. 이과정에서, 적절한규격의연료심제조를위해, 상기의용융물을규격화하기위한주형 (mold) 이필요하게되는데, 일반적으로고온에서활용이가능한재질로쿼츠튜브가주형재료로사용된다. 쿼츠튜브는용융물과접촉하기전, 튜브내면에고온에서용융물과반응이거의없는이트리아 ( 혹은지르코니아 ) 를기반으로하는세라믹슬러리용액을내면에코팅하고, 건조해서주형으로사용한다. 본연구는상기에서언급한금속연료심제조과정에서주형으로사용하는쿼츠튜브내면의코팅에활용하고있는이트리아 ( 혹은지르코니아 ) 세라믹슬러리용액의기초물성을파악하고, 세라믹슬러리용액의튜브표면접착력향상을위해표면거칠기를향상시키는실험을수행하여접착력향상가능성을파악하였다. 또한코팅공정개선을위해, 현재수작업으로진행되고있는쿼츠튜브내면코팅작업 한국세라믹학회 113

124 2018 년한국세라믹학회춘계연구발표회 을개선하기위한, 새로운반자동코팅장치에대한기본개념을제시하고그제작가능성을제시하고자하였다. P1-G2-9 Evaluation of Physical Properties of Mine Backfill Utilizing CO 2 -Solidification CFBC Coal ash CO 2 고정화된 CFBC석탄재를활용한광산채움재의물성평가조용광 1*, 남성영 1, 김춘식 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원산업이발전함에따라다양한산업분야에서많은산업부산물들이발생되고있다. 대표적인산업부산물은화력발전소에서석탄연소후발생되는석탄재 (coal ash), 제철산업에서발생되는고로슬래그등이있다. 이중에서화력발전소에서발생되는석탄재는비산재 (fly ash) 와바닥재 (bottom ash) 로나누어지며발생량의 70% 이상이비산재로알려져있다. 화력발전소에서순환유동층보일러 (Circulating Fluidzed Bed Combustion, CFBC) 는낮은연소로질소산화물생성을억제할수있는장점이있어청정화력발전으로인식되고있으며, 그결과전세계에서차지하는비중이점차증가하는추세이다. 하지만 CFBC보일러에서발생되는석탄재는탈황과정에서투입되는석회석에의해 CaO, SO 3 성분이증가하여이를건축재료로적용할경우급열과균열발생의우려가있어사용이제한되어왔다. 따라서 CFBC석탄재를효과적으로재활용할수있는방안이연구가진행중에있으며한국지질자원연구원에서는 CFBC석탄재를가속탄산화 (CO 2 고정화 ) 시켜중금속용출을억제함으로인해환경적인안정성을확보하는방안을마련하고있다. CFBC석탄재를활용할수있는방안으로광산에적용되는채움재가검토되고있으며, CFBC석탄재를활용할수있는유망한기술분야로대두되고있다. 따라서본연구에서는 CFBC보일러에서배출되는석탄재를탄산화시켜제조한비산재와바닥재를활용하여채움재를제조하고물성평가를통해그특성을연구하였다. 이논문은 2017년도정부 ( 과학기술정보통신부, 환경부, 산업통상자원부 ) 의재원으로한국연구재단-탄소자원화국가전략프로젝트사업의지원을받아수행함. (2017M3D8A ) P1-G2-10 Preparation of Er-TiO 2 Nanotubes and their Photocatalytic Activities Er-TiO 2 나노튜브제조및광분해특성이득용 1*, 이혜란 1, 김도현 1, 허현서 1, 김배연 2, 이명현 3. 1 대림대학교, 2 인천대학교, 3 한국세라믹기술원 0.7 mol% Er-TiO 2 나노튜브를졸-겔법과전기방사법을이용하여제조하여메틸렌블루 (methylene blue) 의광분해 (photocatalytic activity) 특성을조사하였다. 전기방사법은 17G/23G의중공노줄 (dual concentric nozzle) 을이용하여방사하였고 core의오일을화학적으로제거하였다. 전기방사한 Er-TiO 2 나노튜브는 500~650도구간에서 50도간격으로열처리하였다. 열처리온도에따른 Er-TiO 2 나노튜브비표면적이메틸렌블루광분해특성에미치는영향을 XRD, BET, TEM을이용하여조사하였다. P1-G2-11 Superior Lithium Storage in Nitrogen-Doped Carbon Nanofibers with Open-Channels 질소도핑된다공성탄소나노섬유의우수한리튬저장특성평가박성우 1*, 김동완 1, 김재찬 1, 김인하 1, 심현우 2. 1 고려대학교, 2 아주대학교 Li-ion batteries (LIBs) 의음극소재로흔히사용되는흑연계활물질은흑연의낮은이론용량 (372 ma h g 으로인한낮은에너지밀도때문에시장에서요구하는중 대형이차전지에적용하기 에는많은한계를지닌다. 본연구에서는질소도핑된다공성탄소나노섬유 (N-CNFO) 를제조하여 LiBs 의음극소재로활용해고용량 / 장수명특성을구현하고관련기전에대해분석하였다. N-CNFO 는기존전기방사법을통해제조됨에있어서 urea 와폐 Poly-vinylbutyral (W-PVB) 를첨가해질소도핑및다공질특성을부여하였다. 제조된 N-CNFO 의미세구조를분석한결과, 기존 CNF 에서는볼수없던마이크로크기의 1 자형포어가발견되었고비표면적분석에서기존대비 2 배가량의높은표면적을확인할수있었다. 또한, XPS 를통해질소도핑농도를확인한결과 17 wt% 의높은도핑농도를함유하고있음이확인되었으며, 질소도핑종중에리튬저장에용이한 pyridonic-n 의함량이 29% 로높은수준임을확인했다. 합성된 N-CNFO 를 LIBs 의음극소재로적용하였을시, 0.2C-rate 에서 725 ma h g 1 의초기방전용량을보여기존 CNF 대비약 2 배가량높은용량을가지는것을확인했다. 특히, 고속충 / 방전시 (1Crate) 에도 500 회의충 / 방전후에초기용량대비 83% 의높은용량보존율을보여훌륭한장기수명특성을확인할수있었다. 위와같은 N-CNFO 음극의고용량 / 장수명특성은탄소나노섬유내다공질특성과질소도핑으로인한활성면적의증가및고전기전도성때문인것으로판단된다. P1-G2-12 Optimization of Flow Behaviors of Carbon Suspension Using Recycled Raw Materials 재활용원료를활용한카본현탁액의유동특성최적화김영훈 *, 김우형, 이석근. 한국내화 ( 주 ) 본연구에서는재활용원료를친환경적으로활용하고, 다양한산업분야에서활용되고있는카본현탁액개발의일환으로폐카본입자를사용하여카본현탁액을제조하였다. 해당제품들의물성을최적화하기위하여카본의적절한수분산이요구되지만강한소수성으로인한어려움이존재한다. 따라서본연구에서는폐카본의표면을개질하여친수성을부여하였으며, 이를위해분자량이다른나프탈렌계분산제 (A, B) 를적용하였다. 또한침강방지를위해벤토나이트를적용하였다. 폐카본입자를효과적으로수분산시키기위해, 분산제첨가량을달리하여제조한수용액에카본을투입하고 Plate를이용하여 900 rpm, 10 min 조건으로 Pre-mixing 후, Planetary mill을통해 300 rpm, 20 min 조건으로분산시켜현탁액을제조하였다. 분산성을확인하기위해점도계를활용하여점도특성을비교평가하였으며, 분산안정성을확인하고자경시변화를비교관찰하였다. 점도특성을분석한결과, 현탁액의점도는분산제함량이증가할수록낮아졌으며, 경시변화의관찰결과, 벤토나이트는 5 wt% 이상일때침강이발생하지않았다. P1-G2-13 Effect of Hydrogen Gas Flow Rate on Grain Size in MnO-Al 2 O 3 doped UO 2 수소가스주입속도에따른 MnO-Al 2 O 3 가첨가된이산화우라늄결정립크기에끼치는영향정태식 *, 임광영, 김정범, 나연수, 이승재. 한전원자력연료현재까지개발된원자력발전소에서사용되는이산화우라늄의성능향상을위해다양한첨가제개발이전세계적으로이루어졌다. 이산화우라늄성능개선은기본적으로결정립크기를증가시킴으로써얻을수있는크립속도증가및연소가스방출저감을목표로한다. 해외에서는노내연소성능이우수한 Al 2 O 3 -SiO 2 ( 미국, GNF- A), Cr 2 O 3 ( 프랑스, AREVA), Cr 2 O 3 -Al 2 O 3 ( 스웨덴, WEC ATOM) 첨가시스템을개발하였다. 마찬가지로한국에서도 MnO-Al 2 O 3 첨가제가개발되었으며 KNF( 한전원자력연료 ) 에서건식재변환된이상화우라늄과적합성을평가하기위해다양한실험을수행되었다. 114 한국세라믹학회

125 포스터발표 I 일반적으로소결분위기가스분율을조절하여산소포텐셜을바꿔주거나첨가제를바꿔결정립크기성장속도변화를확인하는실험과는달리본연구에서는 MnO-Al 2 O 3 가첨가된이산화우라늄을소결할때환원성가스로사용되는수소흐름속도를바꾸면서발생하는결정립크기성장속도변화가나타나는것을관찰하였다. 이러한실험을통해이산화우라늄소결체대량생산중발생할수있는환원성가스량에의해영향을받을수있는비정상미세조직성장거동을예측할수있다. P1-G2-14 Controlled Electronic Structures of MnO 2 QDs on TiO 2 Nanorods for Enhancing CO 2 to CH 3 OH Conversion Selectivity MnO 2 양자점적용 TiO 2 나노로드의 CO 2 전환메탄올 selectivity 향상김현 *, 김동윤, 양비룡. 금오공과대학교 When quantum confinement is occurred, the electronic structures of nanoparticles formed with different density of states of electrons and holes. This discrete electronic energy states are controlled by a size, a shape and intrinsic properties of quantum dot materials. And also band gap sizes are normally reduced with respect to increasing size of nanoparticles. Those quantum dots could improve the CO 2 conversion hydrocarbon fuels such as carbon monoxide (CO), formic acid (HCOOH) and methane (CH 4 ) that are most low barrier to convert because of aforementioned tunable electronic structures. In this study, MnO 2 quantum dots with wide band gap range of 0.25 ev~3.1 ev are comparably studied for enhancing CO 2 to CH 3 OH conversion selectivity. This metal oxide quantum dots were synthesized by metal deposition with different voltage, duration and solution compositions on hydrothermally grown rutile TIO 2 nanorods/anatase TiO 2 seed layer/fto glass electrode and that were subsequently conducted rapid thermal annealing process. Micro-structures and photo-electrochemical performances of as prepared MnO 2 quantum dots decorating TiO 2 electrode was studied by microscopic analysers and potentiostat respectively. Furthermore CO 2 to CH 3 OH conversion test was studied by gas chromatography with mass spectrometer involving both flame ionization detector and thermal conductivity detector. Acknowledgement (2017R1D1A1B ) P1-G2-15 MnO 2 QDs/CaFe 2 O 4 /TiO 2 /RGO/FTO Photo-cathode for CO 2 to CH 3 OH Conversion CO 2 전환메탄올합성용 MnO 2 양자점 /CaFe 2 O 4 /TiO 2 /RGO/FTO 광캐소드김현 *, 김동윤, 양비룡. 금오공과대학교 Quantum dots (QDs) could improve the CO 2 conversion hydrocarbon fuels such as carbon monoxide (CO), formic acid (HCOOH) and methane (CH 4 ) that are most low barrier to convert because of tunable electronic structures. In this study, MnO 2 quantum dots with wide band gap range of 0.25 ev~3.1 ev are comparably studied for enhancing CO 2 to CH 3 OH conversion selectivity. This metal oxide quantum dots were synthesized by metal deposition with different voltage, duration and solution compositions on hydrothermally grown rutile TIO 2 nanorods/anatase TiO 2 seed layer/fto glass electrode and that were subsequently conducted rapid thermal annealing process. Utilization of the mixed oxides photoelectrochemical system consisting of the electrodeposited, onto RGO/FTO glass support, CaFe 2 O 4 nanobranch/cuo nanorods catalyst and next coupled to MnO 2 nanoparticles, acting as a methanol selective co-catalyst. Micro-structures and photo-electrochemical performances of as prepared MnO 2 quantum dots decorating TiO 2 electrode was studied by microscopic analysers and potentiostat respectively. Furthermore CO 2 to CH 3 OH conversion test was studied by gas chromatography with mass spectrometer involving both flame ionization detector and thermal conductivity detector. These resulting are going to be discussed detail in presentation. Acknowledgement (2017R1D1A1B ) P1-G2-16 TiO 2 Nanotube Arrays Supported RuO 2-x as Efficient Gas Evolving Catalysts 이산화티타늄나노튜브격자를에담지된산화루테늄촉매의가스발생촉매로의응용허성은 *, 조덕기. 서울대학교 RuO 2 is a promising material for various catalytic reaction. However, ruthenium is relatively scarce element in earth, so the reduction of ruthenium is necessary for its wide commercialization. We fabricated novel RuO 2 /TiO 2 nanostructure by electrochemical procedure. TiO 2 nanotube arrays (NTAs) substrate has highly ordered nanostructure, which is able to provide numerous active site. By using these nanostructures, we diminished the content of ruthenium metal. Moreover, we simply alter electrochemical/electrical properties of TiO 2 nanotube arrays through changing annealing condition. It is shown that air-annealed TiO 2 NTAs substrate is a good support for hydrogen evolution reaction but not for chlorine evolution reaction. Also, non-annealed TiO 2 NTAs substrate has a stability issue in acidic condition at cathodic potential. Thus, to use both hydrogen evolution and chlorine evolution Ar-annealed black TiO 2 NTAs substrate is appropriate to a support for gas evolving reaction at both cathodic and anodic region. P1-G2-17 Morphology and Composition of Cu 2 ZnSn(S,Se) 4 Fabricated with Pulse Reverse Electrodeposition 펄스역전착으로제작한 Cu 2 ZnSn(S,Se) 4 박막의형상및조성천기범 *, 서세원. 서울대학교 Because of its non-toxicity and earth abundancy, kesterite (Cu 2 ZnSn(S,Se) 4 /CZTSSe) has received much attention as a solar cell absorber material. Electroplating is competitive process for kesterite film fabrication because of its cost-efficiency, ease for scaling-up, and high precursor usage rate, those are important features for mass production. In this work, pulsed reverse current electrodeposition - annealing processes were performed to fabricate kesterite thin film. This method has advantages in roughness control. Rough surfaces are detrimental to the production of additional layers on the surface, especially in the case of tandem cells, and can also cause severe surface scattering between layers. Since anodic current can dissolve the rough protrusions in pulsed reverse method, we could control the surface roughness by varying many parameters such as current level, deposition/strip time, etc. Fabricated kesterite films showed a much smoother surface than the film deposited in constant current mode. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were performed to 한국세라믹학회 115

126 2018 년한국세라믹학회춘계연구발표회 observe its crystal structure and surface morphology. The atomic composition was observed from energy-dispersive X-ray spectroscopy (EDS). P1-G2-18 Fabrication of TiO 2 /InP/FTO Photo-electrode for CO 2 Reduction CO 2 환원용 TiO 2 /InP/FTO 광전극김동윤 *, 김현, 양비룡. 금오공과대학교 Since a photocatalytic CO 2 reduction has been attention over several decades, to reduce recombination of photo-excited electron-hole pairs before reaction with CO 2 molecule adsorbed on the surface of photocatalysts is become principal issue. It is recognized that among p-type semiconductors, most metal oxides are undergone photo-corrosion when it immersed in electrolyte without scavengers with irradiation of sunlight. In other words, to find out chemically stable p-type semiconductor and reducing recombination probability of electronhole pairs. In this study, It is suggested that n-tio 2 /chemically stable p-type InP hetero-junction for the reduction of CO 2 adsorbed at surface of photo-catalyst. InP was grown on FTO substrate by chemical bath deposition and TiO 2 nanoparticles were electrodeposited on InP nanorod surface respectively. Those microstructures were investigated by transmission electron microscope and crystallinity of electrodes were also characterized. The recombination of electron-hole pairs was studied by time resolved photoluminescence as well as time resolved photo response current density measurement. CO 2 reduction tests were performed using three electrodes system with potentiostat under continuous CO 2 gas bubbling at cathodic side. Detail results about effects of p-n heterojunction on CO 2 reduction will be discussed. Acknowledgement (2017R1D1A1B ) P1-G2-19 Fabrication and Characterization of Pd@Cu-CeO 2 Nanopowders by Hydrothermal Process for Reduction Activity 수열합성법을이용한촉매특성을지니는 Pd@Cu-CeO 2 의합성및특성분석 Yeon bin Choi, Jeong hun Son, Dong Sik Bae *. Changwon National University Cu doped CeO 2 nanoparticle was synthesized by hydrothermal process at 180 o C for 2~10 h. The average size and distribution of the synthesized Cu doped CeO 2 nanoparticles was controlled by reaction times. The crystallinity of the synthesized Cu doped CeO 2 nanoparticles was investigated by X-ray diffraction (XRD) and the morphology was characterized by FE-SEM, also, the specific surface area was measured by BET. The crystal size of the synthesized Cu doped CeO 2 nanoparticles decreased with decreasing reaction times. The average size of the synthesized Cu doped CeO 2 nanoparticles was below 10 nm and narrow, respectively. The shape of the synthesized Cu doped CeO 2 nanoparticles was spherical type. The specific surface area of the synthesized Cu doped CeO 2 nanoparticles increased with decreasing reaction times. Pd@Cu-CeO 2 was synthesized by incipient wetness impregnation and calcined at 500 o C for high reducibility of Cu doped CeO 2 surface. Catalytic activity of Pd@Cu-CeO 2 particles was measured by H 2 -temperature-programed reduction (TPR). As a result, The H 2 consumption increased with increasing specific surface of Cu doped CeO 2 nanoparticles. P1-S21-1 Exploring High Performance and Reliable Air Electrodes for Proton Conducting Reversible Solid Oxide Cells 가역프로톤전도고체산화물연료전지용공기극의높은성능및안정성탐색 Saqib Muhammad *, 이전인, 박준영. 세종대학교 In recent decades due to increasing economic growth and environmental protection awareness, researchers are highly interested in renewable energy sources to build sustainable and decarbonized society [1]. Reversible solid oxide cells (RSOCs) are anticipated to be one of the cleanest and most efficient electrochemical devices for energy conversion and storage. The main advantage of RSOCs are: It can store electrical energy and thermal energy as chemical energy (hydrogen) in solid oxide electrolysis cell (SOEC) mode when the power is surplus, on the other hand, it can produce electrical energy from chemical energy (such as hydrogen and hydrocarbon) in solid oxide fuel cell (SOFC) mode when the electrical energy is deficient [2]. Conventional oxide-ion-conducting electrolyte based RSOCs (OC- ROCs) (e.g. yttria-stabilized zirconia) suffer from the problems of high cost and short service life due to their high operating temperatures ( C), which prevent the large-scale application of RSOCs. In contrast recently, extensive efforts have been devoted to develop the proton-conducting RSOCs (PC-RSOCs) with protonconducting electrolytes operating at intermediate temperatures ( C). PC-RSOCs have several additional advantages: low activation energy for proton transport ( ev) compared to that of oxygen ion conductors ( ev), less Ni oxidation and no further gas separation for H 2 [3]. However, the perfo r mance of PCFCs still need to improve with the lack of high performance and durable cathode materials [4]. In this study, we develop cathode materials to increase electrolysis efficiency and durability using advanced materials for SOECs. The accelerated durability test is also designed to investigate the practical use of PCFCs, and carried out by periodic cyclic conversion between SOFC and SOEC under constant current operations. To investigate the degradation analysis of the cell, microstructural analysis is performed with SEM, TEM and XRD [5, 6]. The objective of this work is to achieve high performance and long term stable cathode materials for PC-ROCs. P1-S21-2 Sulfur Poisoning of Solid Oxide Fuel Cell Based on Ni/Fe Cermet Anode 이호성 *, 이현미, 임형태. 창원대학교 Solid oxide fuel cells (SOFCs) operate under various types of fuel, such as biogas and syngas, due to their high operating temperature (> 700 o C) without the need of pre-reforming. H 2 S poisoning is an important issue for solid oxide fuel cells when operated with biogas and syngas. This study investigates various factors, such as H 2 S concentration, operating temperature and water content in fuel, affecting degradation of SOFCs. Anode supported SOFCs comprising Ni/Fe and yttria stabilized zirconia (YSZ) cermet anode and YSZ thin film electrolyte were fabricated, and their performance was evaluated. The electrochemical impedance spectra (EIS) of the cells were measured in pure hydrogen fuel and compared to H 2 S additives (before poisoning). The performance degradation was studied with 116 한국세라믹학회

127 포스터발표 I concentration of H 2 S (0~50 ppm) at 700 o C under a constant current (500 ma/cm 2 ) condition. In all cases, the H 2 S contained in the fuel caused a rapid drop in the cell performance (named 1st drop), followed by a slow and steady deterioration (named 2nd drop). In the 2nd drop section, the high concentration of H 2 S accelerated the voltage loss while the voltage drop was not observed at the low H 2 S concentration (5 ppm). For post-test analyses, X-ray Diffraction Spectroscopy (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), and Raman spectroscopy were used. Raman results indicate nickel sulfides were formed in the anode layer, especially at the high H 2 S concentration. Thus, the degradation of SOFCs under H 2 S containing fuel is attributed to the formation of the nickel sulfide at Ni anode. P1-S21-3 The Gradient Structure SOFC Anode for the Prevention of Anode/Electrolyte Delamination 손민지 *, 임형태. 창원대학교 The stability of a solid oxide fuel cell (SOFC) stack is strongly dependent on the magnitude and profile of the internal chemical potential of the solid electrolyte. If the internal partial pressure is too high, the electrolyte can be delaminated from the electrodes. The formation of high internal pressure is attributed to a negative cell voltage, and this phenomenon can occur in a bad cell (with higher resistance) in a stack. This fact implies that the internal chemical potential plays an important role in determining the lifetime of a stack. In the present work, we fabricated anode functional layer containing ceria to locally increase electronic conduction at the anode/electrolyte interface region, eventually to prevent high internal pressure, and we test the fabricated cells under a negative voltage condition. The results indicate that the addition of electronic conduction in the electrolyte can effectively depress internal pressure and improve the cell stability. P1-S21-4 Experimental Study of In-plane Performance Variation on Anode Supported Solid Oxide Fuel Cells 김민우 *, 김정명, 박희성, 임형태. 창원대학교 In the planar solid oxide fuel cells, in-plane electrochemical performance can be significantly varied, depending upon operating conditions such as current density and fuel/oxidant utilization, etc. The larger planar is expected to show the significant in-plane performance variation, usually due to the fuel gas concentration changing with fuel supply direction. In addition, the contact resistance can be locally varied unless the actual contact area is maximized. Even in the case of small size button cell, the in-plane performance variation may exist, depending upon the experimental setup as well as operating conditions. In the present study, anode-supported cells, consisting of Yttria Stabilized Zirconia (YSZ) electrolyte, Ni+YSZ anode and Lanthanum Strontium Cobalt Ferrite (LSCF) cathode, were tested with four segmented cathode design, under co-flow and counter-flow conditions. It was observed that the voltage difference between the segments was considerable, which can be more significant, especially under co-flow and high current density conditions. The experiments results will be discussed with numerical analysis. P1-S21-5 Development of Highly Durable La x Sr 1-x Ti y Ni 1-y O 3-δ Electrode for Solid Oxide Fuel Cell (SOFC) SOFC용고내구성 La x Sr 1-x Ti y Ni 1-y O 3-δ 연료극개발이민진 *, 신재화, 정재훈, 황해진. 인하대학교 La-doped SrTiO 3 (LST) 는수소분위기에서전기전도도가우수하고산화-환원분위기에서화학적으로안정하며황및카본코킹에대한내성이우수하다는점때문에고체산화물연료전지용산화물연료극소재로많은주목을받고있다. 그러나기존의 Ni-YSZ cermet 에비하여전기화학반응에대한촉매활성이낮아연료극소재로사용되기위해서는촉매활성의개선이요구되고있는상황이다. 본연구에서는동적인작동환경에안정하고성능이우수한연료극을개발하고자 LST의 titanium 격자에촉매활성이뛰어난 Ni을치환하여 LSTN을합성하였다. LSTN의 Ni은산화분위기에서격자내에고용체를이루고있다가환원분위기에노출되면서 LST 표면에나노크기의 Ni입자가석출되는거동을확인하였다. LSTN의 A site와 B site의조성을변경함에따라이차상없이전도도가높은연료극조성을확정하였고, LSTN을연료극으로하고 LSCF를공기극으로구성한 full cell을제작하였다. 낮은분극저항과높은전기화학적성능을얻기위하여셀구조와공정을최적화하였다. 또한 H 2 와 Air 의공급가스전환에따른 LSTN 연료극안정성및성능변화를확인하고자공급가스전환에따른 cycle을측정하여연료극으로서의내구성을확인하였다. P1-S21-6 Design Evaluation of Tubular Solid Oxide Fuel Cells based on Multiphysics Computational Fluid Dynamics Analysis 멀티피직스전산해석을통한평관형연료전지의설계평가유재영 *, 강주현, 배중면. KAIST This study evaluated four design options of a tubular solid oxide fuel cell (SOFC) to find optimum design conditions. The design case study started with a default cell whose dimensions and channel height were mm 2 and 0.48 mm, respectively. Two cells in different flow configurations were added. The analysis also developed another case of the length-to-width ratio, mm 2, with the default flow channel. A comprehensive computational fluid dynamics (CFD) model calculated the gas composition, current density, and temperature distribution of the four different SOFCs. They were tested in their SOFC and SOEC modes. The CFD analysis confirmed that the mm 2 ratio had higher performance than the default design. The model also showed that the channel shape, not the channel height, contributed to the cell performance. The results of this study are significant because they can give future studies a preview of designing an efficient tubular SOFC. P1-S21-7 Manipulation of Nanoscale Intergranular Phases for High Proton Conduction and Decomposition Tolerance in BaCeO 3 Polycrystals BaCeO 3 다결정산화물에서입계비정질층제거를통한수소이온전도성및화학안정성향상김혜성 *, 배형빈, 정성윤. KAIST In many ion-conducting polycrystalline oxides, grain boundaries are generally accepted as rate-limiting obstacles to rapid ionic diffusion, often resulting in overall sluggish transport. Consequently, based on a precise understanding of the structural and compositional features at grain boundaries, systematic control of the polycrystalline microstructure is a key factor to achieve better ionic conduction 한국세라믹학회 117

128 2018 년한국세라믹학회춘계연구발표회 performance. In this study, we clarify that a nanometer-thick amorphous phase at most grain boundaries in proton-conducting BaCeO 3 polycrystals is responsible for substantial retardation of proton migration and moreover is very reactive with water and carbon dioxide gas. By a combination of atomic-scale chemical analysis and physical imaging, we demonstrate that highly densified BaCeO 3 polycrystals free of a grain-boundary amorphous phase can be easily fabricated by a conventional ceramic process and show sufficiently high proton conductivity together with significantly improved chemical stability. These findings emphasize the value of direct identification of intergranular phases and subsequent manipulation of their distribution in ion-conducting oxide polycrystals. P1-S21-8 Microstructural Stability of SSC Fibrous Cathode with Embedded SDC Particles for Solid Oxide Fuel Cells Operating on Hydrogen 고체산화물연료전지를위한 SDC 입자가내재된 SSC 섬유구조양극의미세구조안정성연구이세욱 *, 최진이, 박상호, 신동욱. 한양대학교 In recent years, the beneficial effects of the fibrous cathode using mixed ionic and electronic conducting (MIEC) materials have been reported. Although many researchers deal with the performance enhancement by applying the fiber structure in SOFCs, the research on the microstructural stability under operating conditions is sparse. In mixed conducting perovskites-type cathode system, the degradation of SOFC commonly results from the following reasons. Firstly, the particle coarsening occurs during the operation, which is a dominant contribution to performance degradation for cathode materials. Secondly, the Sr-enrichment on the surface of cathode materials, which blocks the oxygen reduction reaction sites and decreases the effective surface. In our previous work, a fibrous mixed conducting cathode with embedded ionic conducting particles has been successfully fabricated by a simple and easy approach using an electro-spinning method. However, since the fibers are prone to lose their structures under operating conditions, the long-term stability test should be examined. In this work, we conducted the stability test using a half cell under cathodic polarization (700 o C, 500 ma cm 2, 120 h) to identify the degradation phenomenon from the cathode. The cause of this degradation in fibrous composite cathode could be considered as common problems of perovskites cathode materials such as Srenrichment and grain growth. Fortunately, the fibers retain their shape, porosity and interfacial adhesion. P1-S21-9 Stability of 3, 6, 8 mol% yttria Stabilized Zirconia in Molten Flux Using Solid Oxide Membrane Process Solid oxide membrane 공정시염욕에서 3, 6, 8 mol% YSZ의상안정성에대한연구황국진 1*, 신태호 1, 신미영 1, 이희수 2. 1 한국세라믹기술원, 2 부산대학교 Due to its salient features such as high oxygen ion conductivity, chemical and thermal stability and high mechanical strength, yttriastabilized zirconia (YSZ) is widely used as an electrolyte in solid oxide fuel cells (SOFCs), oxygen pump and thermal barrier coating etc.. Recently, YSZ has been used as a solid oxide membrane (SOM) process for the direct reduction in metal oxides by an electrolysis reaction: MO x M (cathode) + x/2 O 2 (anode). In the SOM process, the YSZ tube is inserted in a molten oxy-fluoride based salt and separates a liquid metal anode and cathode. The metal oxide is dissolved in the molten fluoride flux. When an electrical potential is applied, the metal cations diffused to the cathode where they are reduced. The oxygen anions travel through the flux and YSZ to the anode where they are oxidized. In this study, three different composites of 3YSZ, 6YSZ and 8YSZ powders were investigated. The Raman scattering technique and X- ray diffraction were used to analyze the phase change after the SOM processing. The electrical properties studied by DC 4-prove measurement as a function of temperature. Microstructure was investigated using FE-SEM to analyze infiltration depth of molten flux. These results suggested that the relation between electrical conductivity and phase transition on yttria-stabilized zirconia was caused by the SOM process. P1-S21-10 Application of Atomic Layer Deposition to Solid Oxide Fuel Cells Based on High-k Oxide Materials 원자층증착법을이용한고유전율산화물박막증착및응용연구오지원 1*, 황진하 1, 배승묵 2, 김재환 1. 1 홍익대학교, 2 군산대학교 Solid oxide fuel cells (SOFCs) have attracted the academic and industrial interests as one of the powerful next-generation energy resources, due to the unique advantages such as high operation efficiency, contamination-free fuel flexibility, and minimized pollution. The SOFCs are typically constructed using dissimilar materials of physical and chemical properties, involving a cathode, an electrolyte, and an anode, in addition to the subsidiary sealing and interconnect materials. In order to maintain the highly efficient operation of SOFCs at intermediate temperatures ranging from 650 and 800 o C, the electrodes should be improved dramatically by minimizing the polarization losses along with the improved ionic conductivity. There have been few attempts involving the artificial controls on triple boundary reactions which is based on the charge transfer between electronic/ionic carries and fuels and depends largely on the microstructure of electrodes and interfacial geometries adjacent to the ionic electrolyte. The conformal feature of atomic layer deposition can be employed to control the oxide-based cathodes and anodes, in terms of performance improvement or performance degradation. The current work reports the exemplary works of atomic layer deposition combined with solid oxide fuel cells. The current work chose metal oxide materials for controlling the SOFC cathodes, in order to testify the feasibility of atomic layer deposition with special emphases on the degradation in solid oxide fuel cells. The roles of atomic layer deposition in SOFCs are discussed along with the processing designs with the aim to fabricating towards achieving the optimized SOFC performance and stability. P2-S24-1 Electrical Properties of Cu 2 Se Sintered Body Fabricated by an Oxide Reduction-Hot Pressing Process 산화물환원과가압소결에의해제조된 Cu 2 Se 소결체의전기적특성신지은 *, 임영수, 이길근. 부경대학교열전재료는 Seebeck효과와 Peltier효과를이용하여열에너지와전기에너지를고체상태에서상호변환시키는반도체재료로서최근 118 한국세라믹학회

129 포스터발표 I 에너지효율적활용을위한신재생에너지의한종류로주목받고있다. 현재상업적으로많이사용되는열전재료는 Bi-Te 계로상온영역에서성능이우수한것으로알려져있다. 하지만 Te 의자원희소성과가격불안정성등과같은자원적문제점으로인하여최근에는 Cu-Se 계, Mg-Si 계, Sn-Se 계등과같이 Te 을사용하지않는열전재료에대한개발이활발해지고있다. 그중, Cu-Se 계는자원이풍부한구리금속을사용하며, 낮은격자열전도도를가지므로높은 ZT 값을가지는열전재료로보고되고있다. 한편, 종래의열전재료제조방법으로는단결정성장법과용해분쇄법이이용되고있으며, 최근나노재료기술을통한급속응고 - 분쇄법, 고에너지밀링법등이시도되고있다. 이들공정기술들은초기원료로써고가의순금속혹은합금을이용할뿐만아니라, 장시간, 고에너지를요구하며개발된공정기술을저비용으로상용화시키는데는어려움이있다. 저자는열전합금분말제조를위해전술한종래의다른열전분말제조기술들 ( 단결정성장법, 용해분쇄법, 급속응고 - 분쇄법, 고에너지밀링법 ) 과는달리출발원료로써산화물을이용하여저온, 단시간에합금을제조할수있는산화물환원법공정을제안하고있다. 본연구에서는초기원료로서구리산화물과셀레늄산화물을이용하여 Cu 2 Se 합금분말을제조하고, 제조된합금분말을가압소결한소결체의전기적특성을검토하고자하였다. P2-S24-2 Effects of Cl-doping on Thermoelectric Transport Properties of Cu 2 Se Cl-doping이 Cu 2 Se의열전수송특성에미치는효과에대한연구김민지 1*, 임영수 1, 이길근 1, 김우철 2, 김교민 2, 탁장렬 3, 신원호 4, 서원선 4, 조형균 3. 1 부경대학교, 2 연세대학교, 3 성균관대학교, 4 한국세라믹기술원저렴하고풍부하며환경에무해한원소로구성되어있는열전소재인 Cu 2 Se는고온에서의높은 ZT로인하여최근들어큰주목을받고있다. 본연구에서는 Cu2Se의 Se 자리에할로겐원소인 Cl을도핑하였을때의열전수송특성변화에대해보고한다. Cu 2 Se 1-x Cl x (x = 0, 0.02, 0.04 및 0.08) 화합물은 550 에서고상반응공정을통하여합성하였고, 합성된화합물을방전플라즈마소결법을통하여소결하였다. Se자리에치환된 Cl은전자주개로작용하여정공농도를감소시키며, 이러한효과를통해전하농도에따른출력인자의최적화를가능하게하였다. 또한정공농도의감소에따른전기전도도와열전도도의동시감소는 Cl 도핑에따른열전성능지수의향상을가져올수있었다. 그러나 650 ~ 700 K의온도구간에서는전기전도도의급격한감소로인한출력인자의저하가관찰되었으며, 이는이차상인 CuCl의열분해와관련이있는것으로확인되었다. 이로인하여 Cl이도핑된 Cu 2 Se화합물에서출력인자의향상과열전도도저감의동시구현을통한열전성능지수의향상은 623 K까지가능하였다. P2-S24-3 Sb-doping Effects on Thermoelectric Transport Properties of SnSe 2 Compounds Sb 도핑이 SnSe 2 의열전수송특성에대한미치는효과에대한연구최진식 1*, 김민지 1, 임영수 1, 이길근 1, 심지훈 2, 이창훈 2, 신원호 3, 서원선 3. 1 부경대학교, 2 포항공과대학교, 3 한국세라믹기술원본연구에서는 Sb를도핑한 SnSe 2 의열전수송특성에대해살펴보았다. 도핑자리에따른효과를비교하기위하여 Sn을치환한양이온자리 ((Sn 0.96 Sb 0.04 )Se 2 ) 및 Sb를치환한음이온자리 (Sn(Se 0.96 Sb 0.04 ) 2 ) 에 Sb를각각치환시켜가며실험을진행하였다. 모든시료는용융및어닐링방식으로제작되었으며, 분말화한후방전플라즈마법을 통해소결을수행하였다. 이러한방식으로준비된소결체는이차상이존재하지않는층상육방정계의구조를가진단일상 (JCPDS # ) 을가지고있었다. 5 족의원소인 Sb 가 4 족원소인 Sn 자리에치환되면전자를제공하는전자주개로작용을해야하고, 반대로 6 족원소인 Se 자리에치환되면전자를받아들이는전자받개로작용을해야한다. 하지만본실험에서양이온자리를치환한복합체는도핑을하지않은 SnSe 2 복합체에비해 n-type 의전기전도도가감소하는것을볼수있었고, 음이온자리를치환한복합체의경우에는 n-type 의전기전도도가증가하는것을관찰하였다. 이러한모순된도핑효과는제벡계수의측면에서도관찰할수있었다. 이러한현상은밀도함수이론계산을토대로연구중에있으며, 이를통해복합체의열전수송특성에대한자세한결과가제시될것이다. P2-S24-4 Effects of Zn-doping on Thermoelectric Transport Properties of Cu 2 Se Cu 2 Se의열전수송특성에대한 Zn-도핑효과연구진승현 1*, 김민지 1, 임영수 1, 이길근 1, 김우철 2, 김교민 2, 탁장렬 3, 신원호 4, 서원선 4, 조형균 3. 1 부경대학교, 2 연세대학교, 3 성균관대학교, 4 한국세라믹기술원 We present thermoelectric transport properties of Zn-doped Cu 2 Se. (Cu 1-x Zn x ) 2 Se compounds were prepared by solid state reaction, followed by the consolidation using spark plasma sintering. The Zn content was limited up to x = 0.02 due to the formation of a secondary phase of ZnSe. As the Zn content increased, the electrical conductivity decreased monotonously in both a- and b-phases. This donor doping effect of Zn on Seebeck coefficient was also observed clearly in the both phases. However, the dependence of power factor on the Zn content was different from each other. The power factor could be enhanced with increasing the Zn content in a-phase at relatively low temperatures, while it exhibited more complicated behavior in b- phase at relatively high temperatures. Detailed effects of Zn-doping on the thermoelectric transport properties were discussed and the results will be presented. P2-S24-5 A Study on Thermoelectric Transport Properties of Bi 0.3 Sb 1.7 Te 3 -graphene Oxide Composites Bi 0.3 Sb 1.7 Te 3 -graphene oxide 복합체의열전수송특성연구황의경 1*, 임영수 1, 이길근 1, 김우철 2, 김교민 2, 남우현 3, 신원호 4, 서원선 4. 1 부경대학교, 2 연세대학교, 3 KAIST, 4 한국세라믹기술원본연구에서는 Bi 0.3 Sb 1.7 Te 3 -그래핀산화물 (graphene oxide, GO) 복합체의열전특성에대해보고한다. 먼저용융및열처리공정을통해 Bi 0.3 Sb 1.7 Te 3 잉곳을제작하였으며, 이를 spex-mill을통해분쇄하여분말화하였다. 제작된분말의표면에 GO의함량 (0 ~ 0.2 wt%) 을제어하며코팅을수행하여 Bi 0.3 Sb 1.7 Te 3 -GO 복합분말을제작하였다. 이러한복합분말을방전플라즈마법을활용하여소결하여 Bi 0.3 Sb 1.7 Te 3 -GO 복합체를제작하였다. Bi 0.3 Sb 1.7 Te 3 표면에코팅된 GO는높은전류밀도로진행되는방전플라즈마소결시, 전자에의해환원그래핀산화물 (reduced graphene oxide, RGO) 로환원되었다. 복합체에서 GO의함량이증가함에따라복합체의전기전도도는감소하였지만, 한편제벡계수는증가하는경향이관찰되었다. 또한, 전기전도도에서는소결압력축에따라매우큰이방성이관찰되었지만, 제벡계수에있어서는이방성이거의관찰되지않았다. Hall 측정을기반으로그래핀산화물이이러한열전수송특성에미치는효과가자세하게논의되었으며, 그결과를보고할예정이다. 한국세라믹학회 119

130 2018 년한국세라믹학회춘계연구발표회 P2-S24-6 Thermoelectric Properties of p-type Polycrystalline Si Prepared by Melt-spinning Melt-spinning 법으로제작된 p-type 다결정 Si의열전특성연구선주형 *, 임영수, 이길근, 김성규. 부경대학교지구상에풍부하고환경에무해하며반도체산업의핵심원소인 Si 은우수한출력인자에도불구하고높은열전도도로인하여매우낮은열전특성을나타낸다. 본연구에서는 Si의열전도도를저감시키기위하여급속응고공정중의하나인 Melt-spinning 법을이용하여 Si 분말을제작하고이를방전플라즈마법으로소결하여 p-type 다결정실리콘소결체를제작하여열전특성을연구하였다. 이상과같이제작된 p-type 다결정 Si의전기전도도는원료로사용한 B- doped Si에비해증가하였는데, 이는공정중 Cu wheel에의한오염에의한의도치않은 Cu 도핑효과로여겨진다. 한편, 열전도도의경우단결정 Si의상온열전도도인 149 W/mK 보다현저히낮은 46 W/mK가얻어졌으며, 이를통하여 melt-spinning에의한열전도도저감효과가잘구현된것을확인하였다. 본연구에서최대열전성능지수는 1073 K에서약 0.1을얻었으며, 자세한열전수송현상들을미세구조의효과와함께고찰하였다. P2-S24-7 Study of Thermal and Mechanical Properties of Porous Cu 2 SnSe 3 Thermoelectrics 다공성 Cu 2 SnSe 3 열전재료의열적및기계적특성연구 Siyar Muhammad *, Jun-Young Cho, Chan Park. Seoul National University Currently available commercial TE materials such as Bi 2 Te 3, Sb 2 Te 3 and PbTe consist of either toxic or expensive elements. The study on TE materials with less toxic, less expensive and more earth-abundant elements, is attracting more attention of the TE research community these days. The ternary chalcogenide Cu 2 SnSe 3 is expected to be one of these auspicious TE materials, owning large flexibility to tune its physical and electronic properties. The elements of Cu 2 SnSe 3 are less toxic, abundant in nature and relatively cheap compared to Te and Pb. High electrical conductivity of the CTSe put it in the favorite thermoelectric list, but at the same time high thermal conductivity is an obstacle for its high thermoelectric efficiency. Incorporating porosity within the bulk CTSe can be one choice to control its thermal conductivity without affecting its composition and sacrificing electrical conductivity. To reduce the thermal conductivity of the porous thermoelectric structures, researchers recently used hot press method, followed by leaching of the inert species to get reasonable porosity. In such systems, the mechanical properties of the bulk structure are degraded, and the structures may not be directly used as a thermoelectric module. Herein we introduce a novel method to get reasonable porosity with reduced thermal conductivity, during conventional spark plasma sintering process followed by annealing. Synthesis and optimization of the low thermal conductivity with minimum loss in mechanical properties of the porous Cu 2 SnSe 3 structure will be presented. P2-S24-8 Thermoelectric Properties of High Temperature Phase of SnSe SnSe 고온상의열전특성조준영 1*, Siyar Muhammad 1, 류종훈 1, 진우찬 1, 김성우 1, Rita Galvez 1, 배성환 2, 박찬 1. 1 서울대학교, 2 경남대학교 SnSe is considered as a potential thermoelectric (TE) material for practical application due to its high seebeck coefficient and ultralow thermal conductivity. The low electrical conductivity, however, is the barrier in the way of its commercial application. The rapid change of ZT value of SnSe at temperature around 800 K was reported, which can be caused by the phase transition from low temp pahse (Pnma) into high temp pahse (Cmcm). But the phase transformation of the SnSe from Pnma (low temp) into Cmcm (high temp) is not fully understood. There is no detailed investigation on the low and high temperature phases of SnSe present in the available literature. Higher electrical conductivity and ZT values of the SnSe at high temperature around 800 K, was the motivation to study the structural and TE properties of high temperature phase of SnSe. In this study, high temperature phase of SnSe was obtained by melting and annealing of precursor elements in an evacuated quartz tube followed by water quenching. The detailed phase study of both the low and high temperature phases of SnSe were performed by Rietveld refinement using X-ray diffraction data. The effect of annealing temperature on the phase transition, band gap and thermolectric properties of SnSe will be presented. P2-S24-9 Electronic and Thermal Properties of Si-doped InSe Layered Chalcogenides Si가도핑된 InSe 층상칼코겐화합물의전기적, 열적특성유준연 *, 김지일, 조현준, 추성실, 김상일. 서울시립대학교 The conversion efficiency of the thermoelectric material is represented thermoelectric figure of merit (zt). In order to have a high conversion efficiency, a high power factor and low thermal conductivity are required, In this work, we investigated thermoelectric material InSe (Indium Selenide), which is known to have low thermal conductivity ( W/mK) in a single crystal due to weak interlayer bonding (Van der Waals bonding). However, InSe has low carrier concentration (10 14 cm 3 ). The n-type semiconductor InSe was doped with cation to form a donor level, which increased the carrier concentration. We synthesized In 1-X Si X Se (x = 0.01, 0.02, 0.04 and 0.08) in InSe polycrystalline sample and sintered with SPS, electrical and thermal properties were investigated. As the doping amount of Si improved, the electric conductivity incresed constantly and approached 8.5 S/cm at 795 K. Also the carrier concentration was greatly increased to cm 3. The Seebeck coefficient increased to μv/k at 300 K, and the power factor was greatly enhance. Also, thermal conductivity was slightly decreased. These results show the potential for researching of InSe and its feasibility as thermoelectric power generation. P2-S24-10 Effect of Dislocation Arrays at Grain Boundaries on Electronic Transport Properties of Bismuth Antimony Telluride 입계에형성된전위배열이비스무스안티몬텔루라이드의전자수송특성에미치는영향황재열 1*, 김정원 1, 김현식 2, 김상일 3, 이규형 4, 김성웅 1. 1 성균관대학교, 2 삼성종합기술원, 3 서울시립대학교, 4 연세대학교 Taming electronic and thermal transport properties is an ultimate goal to realize unprecedentedly high performance of thermoelectric (TE) materials. In common, most state-of-the-art TE materials are inherently narrow bandgap semiconductors, which have an inevitable 120 한국세라믹학회

131 포스터발표 I contribution of minority carriers, concurrently decreasing Seebeck coefficient and increasing thermal conductivity. Nevertheless, the restraint control of minority carrier transport has been seldom considered as a key element to enhance the TE figure of merit (zt). Herein, it is verified that the localized dislocation arrays at grain boundaries enable the suppression of minority carrier contribution to electronic transport properties, resulting in an increase of Seebeck coefficient and carrier mobility in bismuth antimony tellurides. It is also suggested that the suppression of minority carrier via the generation of dislocation arrays at grain boundaries is an effective and non-invasive strategy to optimize overall electronic transport properties without sacrificing predominant characteristics of majority carriers in TE materials. P2-S24-11 Thermoelectric Properties of n-type (Bi,Sb) 2 Te 3 Alloys N형 (Bi,Sb) 2 Te 3 소재의열전특성문현아 1*, 이규형 2, 김성웅 1. 1 성균관대학교, 2 연세대학교 In room temperature thermoelectric materials, state-of-the-art materials are p-type (Bi,Sb) 2 Te 3 alloys and n-type Bi 2 (Te,Se) 3 alloys. Thus far, researchers have successfully enhanced zt in p-type Bi 2 Te 3 -based alloys by subjecting the bulk materials to nanostructuring processes. However, similar approaches have been ineffective so far in enhancing zt in n-type Bi 2 Te 3 -based alloys due to the inevitable deterioration of its thermoelectric properties in the basal plane. In addition to, Se segregation at the grain boundaries and Se inhomogeneities lead to a lowering of the thermoelectric performances of the material. Therefore, we investigated thermoelectric propertie of the (Bi x Sb 1 x ) 2 Te 3 with n-type character. And we checked reproducibility of the thermoelectric properties. P2-S24-12 Synthesis of CoSb 3 Nanoparticle by Solvothermal Synthesis 용매열합성법을이용한 CoSb 3 나노분말합성안종필 *, 김민숙, 박주석, 김세훈. 한국세라믹기술원열전발전 (Thermoelectric generation) 기술은온도차를이용한발전방식으로별도의동력원없이온도차만으로전기에너지를생산할수있는친환경적인발전방식이다. CoSb 3 는중고온 (600~900 K) 영역에서우수한특성을갖는열전소재로알려져있다. 일반적인 CoSb 3 분말합성방법은용기에서용융, 냉각시켜볼밀, 핸드밀과같은기계적인방법으로분쇄하여제조하고있으나나노사이즈의분말을제조하는데한계가있다. CoSb 3 나노사이즈의분말은열전성능향상에이점이있지만 CoSb 3 합성시느린상변태거동에의해단일상으로합성하기어려우며균질한크기를갖는분말을합성하는데어려움이있다. 본연구에서는용매열합성 (solvothermal synthesis) 방법을이용하여 CoSb 3 나노분말을합성하고자하였으며 [Co(NH 3 ) 6 ]Cl 3 (1 mol%) 와 C 17 H 33 COONa (3 mol%) 를이용한 Cooleate를활용하여나노분말을합성하고합성조건변화에따른결정상변화및입자크기변화에관한연구를진행함으로써 CoSb 3 나노분말합성거동에대하여연구하였다. P1-G3-1 Rapid Consolidation of Nanostructured ZrB 2 and its Mechanical Properties 나노구조의 ZrB 2 급속소결과기계적성질손인진 *, 조우진, 김성은. 전북대학교 ZrB 2 powders were milled using high-energy ball for various durations and consolidated using the pulsed current activated sintering (PCAS). The effects of milling on the sintering behavior and crystallite size ZrO 2 powders were investigated. A nanostructured dense ZrB 2 specimen with a relative density of up to 97% was readily achieved within 3 min. The ball milling effectively refined the crystallite structure of ZrB 2 powders and facilitated the subsequent consolidation. The sinter-onset temperature was reduced appreciably by the prior milling for 10 h. Accordingly, the relative density of ZrB 2 compact increases as the milling time increases. The hardness and fracture toughness of sintered ZrB 2 increased as the density increases. P1-G3-2 Sintering and Characterization of Oxygen-stabilized Transparent Y 2 O 3 Ceramics 산소안정화된투명이트리아세라믹스소결및특성평가연구정욱기 *, 마호진, 김도경. KAIST Transparent polycrystalline ceramics have been investigated for infrared (IR) windows, solid-state laser medium, scintillators and bioapplications in order to substitute for the single crystal. To obtain the fully dense polycrystalline ceramics, special sintering technologies are used such as vacuum sintering, vacuum hot pressing and spark plasma sintering (SPS). While the full density can be obtained via sintering in a vacuum, the final products show black color which is so-called discoloration. The oxygen vacancy in the sintered ceramics can be removed conventionally by post-annealing in air or in oxygen atmosphere. The post-annealing is insufficient to improve the optical transmittance due to the pore development in the bulk, and it inevitably deteriorates the optical performance. Therefore, it is difficult to obtain the highly transparent ceramics by post-annealing. In order to solve this problem, we introduced new strategy to fabricate the transparent Y 2 O 3 ceramics preventing the formation of oxygen vacancy during the vacuum sintering. The suppression of the oxygen vacancy generation during vacuum sintering is demonstrated successfully by introducing the Y 2 O 3 -ZrO 2 dual powder bed considering the thermodynamics. The as-sintered Y 2 O 3 ceramics shows almost the theoretical transmittance from the visible to the IR range. P1-G3-3 Joining of Liquid-phase Sintered SiC Monoliths using a Preceramic Polymer, MAX Phase or SiC Tape Preceramic polymer, MAX상, SiC 테이프를이용한액상소결된 SiC 단미체의접합박소정 *, 윤당혁. 영남대학교 SiC-based components can be used widely for various applications at high temperatures, including the structural components of Gen-IV nuclear reactors. However, the sintering of SiC into dense monoliths, due to the strong covalent bonding between Si and C, is a big challenge. Sintering additives based on binary Al 2 O 3 -Y 2 O 3 system can produce high density by promoting the formation of a eutectic phase by the reaction with SiO 2 existed on the surface of SiC particles. Further challenge is in the integration of the simple shapes into complex geometries for practical applications. We present the fabrication of high density SiC monoliths using an Al 2 O 3 -Y 2 O 3 sintering additive and their joining using preceramic polymers (polycarbosilane and polysilazane), Ti 3 AlC 2 MAX phase and SiC green tape as filler materials. Efforts have been put to obtain a sound 한국세라믹학회 121

132 2018 년한국세라믹학회춘계연구발표회 joint by optimizing various parameters (heating rate, T and P etc.) to minimize the presence of pores and cracks. Bending strength for buttjoint samples was estimated and correlated with the interfacial microstructure/phases and joint thickness analyzed by a scanning electron microscopy (SEM) and X-ray diffraction (XRD). P1-G3-4 Properties and Rapid Consolidation of Nanostructured ZrO 2 and 3YSZ 나노구조의 ZrO 2 와 3YSZ 급속소결과기계적성질손인진 *, 박근오. 전북대학교 As Nanostructured materials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid for the application of nanomaterials. When conventional sintering processes are used to sinter nano-sized zirconia powders, concomitant grain growth leads to the destruction of the nanostructure. This focuses attention on consolidation methods in which grain growth can be eliminated or significantly reduced. To accomplish this, rapid sintering methods have been widely used to sinter nano-sized powders. Nanopowders of ZrO 2 and 3YSZ were fabricated and rapidly consolidated using high-energy ball milling and the pulsed current activated sintering (PCAS). The sintering behavior and crystallite size ZrO 2 and 3YSZ powders were evaluated. A nanostructured dense 3YSZ compact with a relative density of up to 99% was readily obtained within one min. The hardness and fracture toughness of ZrO 2 and 3YSZ sintered from powders milled for 10h were 450 and 1160 kg/mm 2, 3 and 4.4 MPa m 1/2. Not only hardness but also fracture toughness of 3YSZ are higher than those of ZrO 2. P1-G3-5 Mechanical Properties and Rapid Sintering of Nanostructured Nb 2 C-Al 2 O 3 Composite 나노구조 Nb 2 C-Al 2 O 3 급속소결과기계적성질손인진 *, 김신호. 전북대학교 Although an extremely hard ceramic material, niobium carbide has low fracture toughness to use wide applications. To fabricate nanostructured composite is common method to improve fracture toughness. Nanopowder mixture of Nb 2 C and Al 2 O 3 were synthesized according to the reaction (Al 4 C Nb + 3O 2 3Nb 2 C + 2 Al 2 O 3 ) from Al 4 C 3 and Nb powders by high-energy ball milling. The synthesized mixture of Nb 2 C and Al 2 O 3 powders was consolidated by pulsed current activated sintering method within two min under the 80 MPa pressure. Nb 2 C and Al 2 O 3 in the composite were nano-sized phases. The fracture toughness of a nanostructured Nb 2 C-Al 2 O 3 composite of this study is better than that of previous study. P1-G3-6 Rapid Sintering and Synthesis of Nanostructured Al-TaC Composite 나노구조 Al-TaC 복합재료합성및급속소결손인진 *, 정해철. 전북대학교 The significance of Al matrix composites reinforced with metal carbide having low density and very high hardness increases in order to reduce CO 2 emissions and improve the efficiency of energy in automobile and transportation industries. Nanopowder mixture of Ta and Al 4 C 3 were fabricated by high energy ball milling. Highly dense nanostructured 4Al-3TaC composite was consolidated by highfrequency induction heated sintering within one min from the mechanically activated nanopowder mixture of Ta and Al 4 C 3 under the 80 MPa pressure. The microstructure, sintering behavior and mechanical properties (hardness and fracture toughness) were evaluated using FE-SEM and Vickers hardness tester. P1-G3-7 Characterization of Thermal Conductivity and Mechanical Property of Pressureless Sintered Silicon Nitride Ceramics 상압소결질화규소세라믹의열전도성및기계적특성평가연구공정훈 *, 정욱기, 마호진, 김도경. KAIST Silicon nitride (Si 3 N 4 ) is a useful ceramic material for various technical applications such as electronic substrate materials due to its outstanding properties: excellent mechanical properties, high chemical stability and good thermal shock resistance. Recently, the electronic devices require higher voltage, larger current, and greater power density. The high power consumption results in large thermal stresses, which can be overcome with ceramic substrates with high mechanical properties and high thermal conductivity. In this study, the Si 3 N 4 was pressureless sintered with various sintering additives and its thermal and physical properties were investigated. The sintering additive systems consisted of MgO as a basic fixed additive, Y 2 O 3, Yb 2 O 3, La 2 O 3 as rare-earth oxide additives, and SiO 2 as a nonrare-earth oxide additive, whose properties were evaluated. In order to analyze the factors affecting the thermal conductivity, the existence and the distribution of the secondary phase in grain boundary were investigated through the microstructure analysis using X-ray diffraction and scanning electron microscope. Furthermore, the investigation of thermal conductivity was approached by using Raman spectroscopy instead of the conventional laser flash method. This approach was based on a research of AlN ceramics that the oxygen-related defect in lattice and the FWHM (Full-Width of Half Maximum) of specific Raman peaks have shown a proportional relationship. P1-G3-8 Method of Manyfacturing Nuclear Fuel Pellet Consisting of Duplex Grains 고연소시핵연료외부에형성되는 rim 구조억제를위한이중결정립조직 UO 2 핵연료제조기술김정범 *, 임광영, 나연수, 정태식, 이승재. 한전원자력연료원자로가동중고연소의경우 UO 2 핵연료외부에서 rim 구조를갖는미세조직이형성된다. UO 2 핵연료의 rim구조는구조건전성에문제를발생시키기때문에입자크기를증가시킴으로 UO 2 핵연료의 rim 구조를억제할수있다. 본연구에서는첨가제가혼합된 UO 2 성형체에 SiO 2 전구체를기체로침투시켜첨가제와의반응을통해, 핵연료소결체의외부영역입자크기를증가시켜내부영역과외부영역의결정립크기가다른소결체제조기술을연구하였다. 제조된 UO 2 소결체의외부결정립크기는약 36 µm의큰결정립을갖고, 내부영역은약 10 µm 미만의크기를나타냈으며, 외부영역의범위는외부표면에서중심방향으로 3000 µm 이상의크기를갖는것으로확인되어졌다. 외부영역의입자크기및형상은소결첨가제의조성에의존하였으며, 입자크기의경우첨가제함량보다조성에더크게영향을받는것으로나타났다. 이와같은외 내부영역을구성하고있는 UO 2 핵연료는결정립의기능적상호작용을통하여고연소도에서핵연료의안정성및연소도를크게증진시키며, 운전출력및운전온도를높일수있을것으로예상되어진다. 122 한국세라믹학회

133 포스터발표 I P1-G3-9 Analysis of Wear Rate of Yttria Stabilized Zirconia Beads with Different Microstructure and Mechanical Properties 고에너지분쇄매체지르코니아비드의미세구조및기계적특성에따른마모율분석김정환 1*, 윤세중 2, 한병동 1, 윤운하 1, 최종진 1. 1 재료연구소, 2 과학기술연합대학원대학교최근세라믹나노재료의연구가활발히진행됨에따라나노크기의세라믹분말을생산하는제조공정또한주목받고있다. 이중 Top-down 접근법중하나인 High-energy ball milling 방법은고속으로회전하는교반장치가분쇄매체에가하는충격에너지에의해재료를분쇄하는방식이다. 분쇄매체의파괴와마모가피분쇄물의순도에직접적인영향을주기때문에높은기계적특성을가지는분쇄매체가요구되어높은경도와파괴인성을가지는 Yttria stabilized tetragonal zirconia polycrystals (Y-TZP) 가주로사용된다. Y-TZP의높은파괴인성은 Tetragonal 상에서 Monoclinic 상으로상전이하면서발생하는변형에의한충격흡수에의해나타난다. Y 2 O 3 의함량에따라상온에서 Tetragonal상의안정성이변화하며 2~3 mol% Y 2 O 3 첨가하였을때상온에서 Tetragonal 상의열역학적안정성이감소하고충격에의한상전이가쉽게발생하여효과적으로충격을흡수한다고알려져있다. 때문에최종소결체의균일한 Y 2 O 3 분포를요구한다. 본연구에서는상용품의 50~100 um급세라믹비드의 SEM 및 TEM 미세구조분석을통해입자크기및입내 / 입계의이트리아분포를분석하고, 각종물리적특성평가과함께 High-energy ball milling 시간에따른분쇄매체의마모율를측정하여그상관관계를비교분석하였다. P1-G3-10 Fabrication of Building Integrated Solar System with PDLC Smart Window Applied Energy Harvesting 에너지하베스팅이적용된건물일체형태양광시스템 PDLC 스마트윈도우제작강성찬 1*, 오정표 1, 김은미 2, 강지연 2, 허기석 2. 1 전남대학교, 2 한국생산기술연구원본연구에서는박막형태양전지를결합하여자체구동이가능한스마트윈도우를제작하였다. 스마트윈도우 란외부의빛의투과율을자유롭게조절하여사용자에게쾌적한환경을제공하는윈도우이다. 간단한조작을통해상태를투명, 불투명으로조절할수있으며기본적으로필름또는유리를창문에부착하여동작시킨다. 투과율을조절기능이가능한스마트윈도우기술은 PDLC (Polymer Dispersed Liquid Crystal), LCD (Liquid Crystal Display), ECD (ElectroChromic Device) 등의기술이있다. 이중 PDLC 방식은전압을인가시켜구동시키는방식을사용하며, 다른스마트윈도우기술에비해구동전압이낮고투과도 onoff의차이가크며구동속도 ( 응답속도 ) 가빠르다, 또한대면적으로제작하기가용이하여스마트윈도우로써연구가많이되고있다. 이에따라, 본연구에서는 PDLC형스마트윈도우, 아누이노보드, 태양전지를활용하여에너지하베스팅이적용된건물일체형태양광시스템 (BIPV, Building Integrated Photovoltaics) 스마트윈도우를제작하고자한다. 부과기능을제어하기위해 ATmega328 마이크로컨트롤러를사용한아두이노우노보드를사용하였다. 이보드를통해조작및제어를시스템을제작하였으며조작부에서는원하는모드에관한신호를송신해주고제어부에서는모드신호를수신하여선택된모드에대해제어가진행되게된다. 또한제어부에서는조도센서데이터를통해스마트윈도우의투과도를조절하고자한다. P1-G3-11 고에너지방전플라즈마소결을통한 Ni-Ti-Al/TiC 복합체의방향성에따른기계적특성평가 Evaluation of Mechanical Properties with Orientation of Ni-Ti- Al/TiC Composites through High-Energy Spark Plasma Sintering 이동진 *, 반신혜, 임영훈, 박성환, 강명창. 부산대학교 Ni-Ti-Al 을기반으로한합금소재는높은내열성을가지고있으며, 기존의 Ni-Ti합금에 Al을첨가하여내식성을향상시키는연구가진행되고있다. 한편 2차상을첨가하는경우에는균일한분포와불순물상을조절하기어렵기때문에기계적특성을향상시키는연구가필요하다. 따라서본연구는고에너지방전플라즈마소결법 (Spark Plasma Sintering, SPS) 을이용하여합금조성이 50 : 40 : 10 인 Ni- Ti-Al합금에탄화계기반세라믹 TiC를 20, 30 및 40 wt% 의비율로 BPR (Ball Powder Ratio) 을 10 : 1로하여직경 10 mm의볼을이용하여혼합하였으며, 소결온도 1000, 1050 및 1100 o C에서 10분간유지하여제조하였다. 이를통하여, 기계적특성에영향을미치는 SPS 의가압방향에의한수평방향과수직방향의방향성 (Orientation) 에따른밀도, 경도, 파괴인성을평가하고자한다. 아르키메데스법에의하여밀도를측정분석하고, FE-SEM을통해시편의수평과수직단면에서의미세구조와입자크기변화를관찰한다. 그리고신뢰성있는경도값과파괴인성값을측정하기위하여시험편의하중에의한압흔 (Indentation) 형상을분석한다. 이상의결과로부터, Ni-Ti- Al/TiC 복합체의기계적특성을보증하는내마멸성부품에응용가능성을제시하고자한다. P1-G4-1 Warm White Emission of Sr 8 MgY(PO 4 ) 7 :Eu 2+, Mn 2+, Ce 3+ Phosphors for High Color Rendering White LEDs 고연색성 LED에응용될수있는 Sr 8 MgY(PO 4 ) 7 :Eu 2+, Mn 2+, Ce 3+ 백색형광체의형광특성조사홍우태 *, 박진영, 정종원, 양현경, 문병기. 부경대학교 Commercial white light emitting diodes (LEDs) combined with yellow emitting phosphors and blue LEDs were widely used due to the high efficiency, long life time. However, these white LEDs exhibit low color rendering and high color temperature, due to the poor red emission. Also, fixed color rendering of white LEDs can not satisfied various demand of color rendering on residence, exhibition, commercials and indoor illumination area. Currently, RGB (red, green and blue) emitting phosphor on UV LEDs have favorable properties, including controllable CCTs, color rendering and color coordinates. For these reason, developing new phosphor with RGB emission is important to control a color rendering of white LEDs. Until now, the phosphors based on Sr 8 MgY(PO 4 ) 7 host lattice exhibit high UV absorption and green/red emission by Eu 2+ /Mn 2+ doping, respectively. However, tri-color emission of Sr 8 MgY(PO 4 ) 7 host lattice were not researched. In this study, the Sr 8 MgY(PO 4 ) 7 :Eu 2+, Mn 2+, Ce 3+ phosphors were synthesized by solid-state reaction. Luminescence mechanism of the Sr 8 MgY(PO 4 ) 7 :Eu 2+, Mn 2+, Ce 3+ phosphors were studied. Also, warm white LEDs were fabricated by combining a Sr 8 MgY(PO 4 ) 7 :Eu 2+, Mn 2+, Ce 3+ phosphor and UV LEDs. P1-G4-2 Copper Doped TiO 2 Nanoparticles with Different ph Values for Improving Photocatalytic Degradation of Dyes 구리가첨가된 TiO 2 나노입자의 ph 변화에따른유기염료의광분해효율변화연구박성준 *, 윤영우, 정종원, 양현경, 문병기. 부경대학교 한국세라믹학회 123

134 2018 년한국세라믹학회춘계연구발표회 Recently, much attention has been paid to the removal of several environmental pollutants (dyes: congo red, methylene blue, and rhodamine B). General techniques of removal pollutant are adsorption on activated carbon and reverse osmosis which is only changing dye pollutant from water to the other phase. But, it induces the secondary pollution. To solve this problem, semiconductor photocatalystassisted advance oxidation process was developed. Therefore, the anatase structure Cu doped TiO 2 particles with different ph values (5, 8 and 12) were prepared by ph modifiers: nitric acid- and ammonium hydroxide-assisted solvothermal reaction. The change of the crystallinity and band gap by synthesis condition (impurity doping and ph value) was researched. The photocatalytic studies of Cu doped TiO 2 showed strong dependence of crystallinity, band gap and luminescent properties. The samples showed the efficient photocatalytic activity on methylene blue. We consider that Cu doped TiO 2 materials can be effectively applied in photocatalytic materials. P1-G4-3 The Role of Sintering Temperatures in the Luminescent Properties of Eu 3+ doped Gd 2 (MoO 4 ) 3 Red Phosphors 소결온도에따른 Eu 3+ 이온이첨가된가돌리늄몰리브덴산화물형광체의형광특성변화연구이성제 *, 서영조, 박진영, 양현경. 부경대학교 GaN chip based solid-state lighting applications has been paid much attention towards the development of white light-emitting diodes (WLEDs). WLEDs produced by the combination of blue LEDs and yellow phosphors are popular lighting source because of the high luminescence efficiency, high thermal stability and low cost. However, these WLEDs suffers from problems such as cold white light (high color temperature) and a low color-rendering index (CRI), which results from the lack of red spectral contribution. To solve these problems, many research of red phosphor for LED application. Among these materials, Gd 2 (MoO 4 ) 3 :Eu 3+ phosphor exhibit good red luminescence with high UV absorption, which is favorable candidates for LED application. In order to apply these phosphors in LEDs, synthetic optimization must be carried out, because the phase transition of Gd 2 (MoO 4 ) 3 occur at various sintering temperature. Herein, Eu 3+ doped Gd 2 (MoO 4 ) 3 red phosphors were synthesized by a solid-state method. The effect of Eu 3+ concentration in crystal structure, morphology and luminescent properties of phosphors was investigated by using X-ray diffraction (XRD), photoluminescence (PL), field emission-scanning electron microscope (FE-SEM) and field emission transmission electron microscope (FE-TEM). P1-G4-4 Novel Red-emitting La 2 Ti 2 O 7 :Eu 3+ Pphosphor for Potential Applicaton La 2 Ti 2 O 7 :Eu 3+ 적색형광체의응용을위한형광특성연구박진영 1*, 정종원 1, 박성준 1, 제재용 2, 양현경 1. 1 부경대학교, 2 동의과학대학교 To date, layered perovskite structure of Ln 2 Ti 2 O 7 compounds (Ln = La 3+, Pr 3+, Nd 3+ ) with a low symmetry crystal structure in a space group of P2 1 has been subject of considerable interests due to their properties as electrical device, optical devices and photocatalyst. Among them, La 2 Ti 2 O 7 is an excellent host material to fabricate luminescence materials due to physical and chemical stability. However, no research reports are available on the development of latent fingerprint visualization by La 2 Ti 2 O 7 :Eu 3+ phosphor. Upon going through the literature, reports on various synthesis techniques of La 2 Ti 2 O 7 were developed such as solid-state reaction, sol-gel method, hydrothermal method, precipitation method. However, it is clear that the La 2 Ti 2 O 7 synthesized by a solvothermal reaction method has not been reported so far. Therefore, we have undertaken this research. Herein, we report the use of La 2 Ti 2 O 7 :Eu 3+ phosphors as a novel luminescence material for powder dusting of latent fingerprint detection. Also, we discussed the details of the synthesis and characterization of Eu 3+ ions doped La 2 Ti 2 O 7 host lattice by a solvothermal reaction method. The structural properties were analyzed by the X-ray diffraction patterns, scanning electron microscope images and Raman spectrum. The optical properties were examined in detailed by the measurement of photoluminescence excitation, emission and decay curves as a function of Eu 3+ ion concentration in the La 2 Ti 2 O 7 host lattice. P1-G4-5 Functionalized Up-conversion Nanoparticles Luminescence Properties and Bio-imaging Application 기능성상향변환식나노형광체의형광특성과바이오이미징연구정종원 1*, 박진영 1, 홍우태 1, 제재용 2, 양현경 1. 1 부경대학교, 2 동의과학대학교 Lanthanide ion (Ln 3+ )-doped up-conversion nanoparticles (UCNPs) are able to absorb NIR photons and convert such low energy excitations into shorter wavelength emissions. Utilizing long-lived, ladder-like energy levels of Ln 3+, the intensity of anti-stoke''''s luminescence of UCNPs is orders of magnitude more potent compared with those of conventional synthetic dyes or quantum dots (QDs). Due to these unique properties, UCNPs have emerged as a new class of materials in a wide range of applications, such as bio-sensing, chemical sensing, in vivo imaging, drug delivery, photodynamic therapy and photo activation. The UCNPs capped with the functional group (-COOH and -NH 2 ) of polyethyleneimine (PEI)/polyacrylic acid (PAA) on the surface make the UCNPs water soluble and nontoxic for bioapplication. The visible green and blue emissions are observed from the UCNPs upon NIR excitation. In this study, the functionalized UCNPs were one-step hydrothermal method. And the characterizations of NaLuGdF 4 :Yb 3+ /Er 3+ and NaLuGdF 4 :Yb 3+ /Tm 3+ were performed by using photoluminescence (PL), field emission scanning electron microscope (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). And the HeLa cell was bio-imaging using these functionalized UCNPs. P1-G4-6 Fabrication and Characteristic Analysis of Selfilluminated PDLC Smart Window Using Mixture of ZnS:Cu with PDLC ZnS:Cu와 PDLC를결합하여자체발광기능이있는스마트윈도우제작및특성분석오정표 1*, 김은미 2, 강성찬 1, 강지연 2, 허기석 2, 우정주 1. 1 전남대학교, 2 한국생산기술연구원빛의투과율을능동적으로조절할수있는유리를스마트글라스, 스마트윈도우라고한다. 현재연구된스마트윈도우중빠른응답 124 한국세라믹학회

135 포스터발표 I 속도와프라이버시보호, 편리성, 에너지절약이용이한능동형스마트윈도우가주목받고있고그예로 PDLC (Polymer Dispersed Liquid Crystal), ECD (ElectroChromic Device), SPD (Suspended Particle Devices) 가있다. 그중 PDLC는응답속도가빠르고제조법이간단하며대면적제작이용이하기때문에많이사용되고있다. 이연구에서는 PDLC 형스마트윈도우에 ZnS:Cu 형광체를결합하여자체발광기능이있는스마트윈도우를제작하고특성을분석하고자한다. PDLC형스마트윈도우의구조는두장의투명전극이증착된필름사이에고분자액정이분산되어있는형태이며 AC 전압으로구동하게된다. 필름사이의간격에따라투과도와구동전압이영향을받으며주로 silica 혹은고분자소재의 spacer를사용하여간격조절을한다. 이때 spacer의역학을대신하여 ZnS:Cu 형광체를사용하여간격조절과함께발광기능을첨가하고자한다. 사용된 ZnS:Cu 형광체는모체인 ZnS 분말을 Ball mill 방법을사용하여균일하고 PDLC 구동전압에유리한크기로분쇄하였고, 분쇄한 ZnS 분말은고상반응법을사용하여 Cu가도핑된 ZnS를제작하였다. 제작된 ZnS:Cu형광체를사용하여자체발광기능이있는 PDLC형스마트윈도우를제작하고투과, 발광특성을분석하였다. P1-G4-7 Fabrication and Characteristic Analysis of Smart Window with Patterned Light Emitting Area by Screen Printing Method 스크린프린팅방법으로발광영역을패터닝한스마트윈도우제작및특성분석강지연 1*, 김은미 1, 오정표 2, 강성찬 2, 허기석 1. 1 한국생산기술연구원, 2 전남대학교빛의투과율조절이주기능으로사용자의편리성, 빠른응답속도, 사생활보호기능을갖는능동형스마트윈도우는대표적으로고분자분산액정 (PDLC ; Polymer Dispersed Liquid Crystal) 이있다. PDLC 는제작방법이간단하며, 대면적, 유연성기판에제작가능한장점때문에건축용유리, 투명디스플레이, 광학셔터등의투과율조절이능동형으로요구되는전기-광학소자에서사용되고있고, 구동속도가빠르고 On-Off 투과율차이가크기때문에스마트윈도우가활용되는분야에서많은연구와응용이되고있다. 이연구에서는스크린프린팅방법을사용하여다양한발광영역을가지는 PDLC 스마트윈도우를제작하였다. 먼저 PDMS와 ZnS:Cu 형광체를 8 : 2 비율로혼합한후스크린프린팅방법을사용하여하부투명전극층위에다양한형태의발광영역을패터닝하고, 그위에 PDLC를코팅하여발광이가능한 PDLC 스마트윈도우를제작하였다. 제작된패터닝된발광스마트윈도우는 spectrophotometer를사용하여투과율, 밝기, 발광파장, 색도의광학적특성을분석하였다. P1-G4-8 Synthesis and Photoluminescence Properties of BiTaO 4 Phosphors Doped with Different Activators 서로다른활성제가도핑된 BiTaO 4 형광체의합성과구조및발광특성김현수 *, 조신호. 신라대학교최근에백색발광다이오드는형광등과백열등에비하여친환경적이며높은발광세기와긴수명을나타내기때문에차세대고체광원과메디컬영상장치로그응용성을넓히고있다. 본연구에서는다양한색상을갖는연색지수가높은녹색, 황색, 주황색, 적색발광형광체를고상반응법을사용하여합성하였다. 활성제이온의종류를달리하여합성한형광체의결정구조, 결정입자의형상과크기, 발광과흡광스펙트럼의파장과세기변화를조사하였다. 파장 386 nm 로여기시킨 BiTaO 4 :Dy 3+ 형광체의발광스펙트럼은 Dy 3+ 이온의 4 F 9/2-6 H 15/2 전이에의한 479 nm 피크를갖는청색발광과 4 F 9/2-6 H 13/2 전이에의한 576 nm 의황색발광이관측되었다. Eu 3+ 이온이도핑된 BiTaO 4 형광체의경우에는 465 nm 로여기시켰을때발광스펙트럼은 Eu 3+ 이온의 5 D 0-7 F 1 전이에의한주황색발광 (590 nm), 5 D 0-7 F 2 와 5 D 0-7 F 전이에의한적색발광 (613, 702 nm) 이발생하였다. 375 nm 로여기시킨 Sm 3+ 가도핑된 BiTaO 4 형광체는세종류의발광스펙트럼 (566, 610, 647 nm) 을보였다. Tb 3+ 가도핑된형광체의경우에발광스펙트럼은 545 nm 와 612 nm 에정점을갖는녹색과적주황색발광을나타내었다. 상기의실험결과로부터 BiTaO 4 모체격자에도핑되는활성제이온의종류를변화시킴으로써다양한천연색의발광을구현할수있음을제시한다. P1-G4-9 Photoluminescence Properties of NaTaO 3 :RE 3+ (RE= Dy Eu, Sm, Tb) Phosphor Powders NaTaO 3 :RE 3+ (RE=Dy Eu, Sm, Tb) 형광체분말의발광특성박종빈 *, 조신호. 신라대학교고상반응법을사용하여서로다른희토류이온을도핑한 NaTaO 3 :RE 3+ (RE=Dy, Eu, Sm, Tb) 형광체분말을합성하였다. 네종류의희토류이온 (Dy, Eu, Sm, Tb ) 이도핑된 NaTaO 3 :RE 3+ 형광체분말의구조, 표면형상과입자의크기, 흡광과발광특성에미치는영향을조사하였다. 초기물질 Na 2 CO 3, Ta 2 O 5, Dy 2 O 3, Eu 2 O 3, Sm 2 O 3, Tb 4 O 7 을화학양론적으로준비하여 400 o C에서 4시간동안하소공정과 1100 o C에서 5시간동안소결하여합성하였다. 형광체의흡광과발광스펙트럼은모체결정에도핑된희토류이온의종류에따라현저한차이를보였으며, NaTaO 3 형광체의발광스펙트럼은여러종류의발광파장으로구성되었다. Dy 3+ 이온이도핑된경우에 4 F 9/2 6 H 15/2 전이에의한 479 nm의청색발광과 4 F 9/2 6 H 13/2 전이에의한 574 nm의황색발광이나타났으며, Eu 3+ 이온의경우에 5 D 0 7 F 1, 5 D 0 7 F 2, 5 D 0 7 F 3, 5 D 0 7 F 4 전이에의한각각 593 nm 의주황색발광, 616 nm의적주황색, 649 nm와 692 nm의적색발광이발생하였다. Tb 3+ 이온의경우에는 5 D 4 7 F 6, 5 D 4 7 F 5, 5 D 4 7 F 4, 5 D 4 7 F 3 전이에의하여각각 490 nm ( 청색 ), 544 nm ( 녹색 ), 587 nm ( 주황색 ), 622 nm ( 적색 ) 발광이보였고, Sm 3+ 이온이도핑된경우에는 4 G 5/2 6 H 5/2, 4 G 5/2 6 H 7/2, 4 G 5/2 6 H 9/2 전이에의한 564 nm ( 황색 ), 600 nm ( 주황색 ), 645 nm ( 적색 ) 발광파장이각각관측되었다. 발광이외에도 NaTaO 3 모체결정에주입되는다양한활성제이온의종류와농도변화에따른색좌표를결정하였다. P1-G4-10 Optical Properties of NaNbO 3 :RE 3+ (RE=Dy, Eu, Dy/ Eu) White Light Emitting Phosphor Powers NaNbO 3 :RE 3+ (RE=Dy, Eu, Dy/Eu) 백색광형광체분말의광학특성이원웅 *, 조신호. 신라대학교최근에고효율의백색발광소재를개발하기위한희토류복합체의제조에많은관심이집중되고있다. 모체격자에도핑되는희토류이온의종류와자리 (site) 대칭성은백색광을구현하는데있어서중요한요소로알려져있다. 본연구에서는고상반응법으로두종류의활성제 Dy 3+ 와 Eu 3+ 이온을 NaNbO 3 모체결정에동시도핑하여백색광형광체를제조하였다. 활성제 Dy 3+ 이온을단일도핑한 NaNbO 3 형광체의경우에, 파장 388 nm로여기시켰을때발광스펙트럼은발광세기가제일강한 Dy 3+ 이온의 4 F 9/2-6 H 13/2 전기쌍극자전이에의한 575 nm에피크를갖는황색발광스펙트럼, 상대적으로발광세기가약한 4 F 9/2-6 H 15/2 자기쌍극자전이에의한 479 nm 에피크를갖는청색발광스펙트럼, 4 F 9/2-6 H 11/2 자기쌍극자전이에 한국세라믹학회 125

136 2018 년한국세라믹학회춘계연구발표회 의한 662 nm 에피크를갖는적색발광스펙트럼으로구성되었다. Dy 3+ 이온의농도를 5 mol% 에고정하고, Eu 3+ 이온을 0.5, 1, 5, 10 mol% 로각각증가함에따라 Dy 3+ 이온의전이에의한발광 (479, 575 nm) 세기는순차적으로감소하였고, Eu 3+ 이온의전이에의한주황색과적색발광 (593, 614, 692 nm) 세기는점차적으로증가하여 10 mol% 에서최대의발광세기를나타내었다. Eu 3+ 이온의농도변화에따른 CIE 색좌표와결정입자의형성과크기의상관관계를조사하였다. P1-G4-11 Properties of GdVO 4 :Dy 3+,Eu 3+ Phosphors Synthesized with Different Concentrations of Eu 3+ Ions 서로다른 Eu 3+ 이온의농도로합성한 GdVO 4 :Dy 3+,Eu 3+ 형광체의특성박기원 *, 조선욱. 신라대학교최근에희토류이온 (Dy 3+, Eu 3+ ) 이도핑된형광체분말은디스플레이패널과백색광다이오드개발에있어서주된발광요소로응용되고있다. 일반적으로백색발광은청색발광다이오드칩상부에 YAG:Ce 황색형광체분말을도포하여구현하고있으나, 이경우에적색발광의세기가미약하여낮은연색지수를나타내어그응용에한계를보이고있다. 이러한문제점을해결하고자, 본연구에서는 Dy 3+ 가단일도핑된 GdVO 4 황색광형광체, Eu 3+ 가단일도핑된 GdVO 4 적색광형광체, Dy 3+ 와 Eu 3+ 이온이동시도핑된 GdVO 4 백색광형광체를고상반응법으로합성하였다. 특히, Eu 3+ 이온의농도변화에따른 GdVO 4 백색광형광체의흡광과발광세기의변화, 발광파장의이동을 CIE 색좌표로결정하여최적의연색지수를갖는백색광소재를제조하는합성조건을제시한다. P1-G4-12 Photonic Crystal Properties with Microstructure in Anodized TiO 2 Nanotube Arrays 양극산화 TiO 2 나노튜브어레이의미세구조변화에따른광결정특성김완태 *, 이창규, 나경한, 박상우, 최원열. 강릉원주대학교 TiO 2 나노튜브어레이는수직정렬된구조를가지고있으며넓은비표면적을가지고있다. 또한내산성등화학적성질및전기적특성이우수하여, 광촉매, 가스센서, 태양전지, 광학바이오센서등의다양한분야에서효과적인성질을나타내고있다. 광결정은 TiO 2 나노튜브어레이의응용분야중하나이며이를광학적으로응용하기위해서는나노튜브의직경, 길이및표면상태등다양한미세구조의제어가필요하며이에따른광학적특성의변화에대한이해가필요하다. TiO 2 나노튜브어레이는양극산화공정을통해쉽게제작될수있다. 양극산화공정의변수에는인가전압, 시간, 온도, 전해액의농도, 승압및강압속도등다양한변수가 TiO 2 나노튜브어레이의미세구조변화에영향을준다. 이런나노튜브어레이의형성을제어하기위해양극산화전압, 시간, 온도등의공정변수를제어하여 TiO 2 나노튜브어레이를형성시켰으며전계방출형주사전자현미경을이용하여미세구조를관찰하였다. 또한 CCD 카메라를이용하여광회절을관찰하였다. 변수제어를통해약 150nm의노드길이를갖는 TiO 2 광결정이형성된것으로보였으며, 10% 에탄올에대해증류수분위기대비약 0.5 nm의회절파장의변화를갖는것으로분석되었다. P1-G4-13 Microstructure and Magnetic Properties of Ferrites Nanofibers Fabricated by Electrospinning 전기방사법으로제조된페라이트나노섬유의미세구조및자기특성 나경한 1*, 김완태 1, 이창규 1, 박동철 2, 송태협 3, 이세현 3, 신현규 4, 최원열 1. 1 강릉원주대학교, 2 주식회사위드엠텍, 3 한국건설기술연구원, 4 한국산업기술시험원자성재료의자기특성은그미세구조에큰영향을받는데, 이에나노기술을적용하여미세구조를부여한자성복합재료에관한다양한연구가진행되고있다. 1 차원구조를갖는나노재료는기존의다양한벌크재료에비해넓은비표면적과높은전자이동도등우수한물성을보이는것이여러연구에서증명되어다양한분야에서그활용가능성이모색되고있다. 이에 1 차원나노섬유구조가부여된자성재료의경우, 그자화거동특성이어떤응용가능성을갖는지검토하고자본연구를진행하였다. 다양한형상의나노구조체를제조하기위한방법들로템플레이트법, 수열합성법, 양극산화법등이있으나 1 차원의섬유상을얻기위한공정에는전기방사법이대면적제조의용이성, 빠른생산수율등의이점을갖는다. 전기방사법으로얻은나노섬유는재현성이높고큰종횡비를갖기때문에졸 - 겔반응을이용해세라믹나노섬유를제조하기위한방법에도응용되며연구성과의발표와보고도지속적으로증가하고있다. 본연구에서는전기방사를응용하여합성용이하며대표적자성체인 α-fe 2 O 3 나노섬유를균일하며재현성높게얻을수있는용액및전기적, 열처리조건을확인하고섬유의지름등형상에따라자화특성이어떻게달라지는지관찰하였다. 전계방출형주사전자현미경을이용하여관찰한나노섬유의평균직경은 96 nm 에서 59 nm 까지분포했으며, XRD 분석결과를통해결정상을확인하였다. P1-G4-14 Fabrication and Microstructure Control of TiO 2 Nanofibers by Electrospinning 전기방사법을이용한 TiO 2 나노섬유제조및미세구조제어이창규 *, 김완태, 나경한, 조현, 최원열. 강릉원주대학교전기적으로하전된고분자용액및용융물의젯 (jet) 을통해나노섬유를제조하는전기방사공정을통해 TiO 2 나노섬유를제조한다. TiO 2 나노섬유는생체친화적특성을이용하여의료용에서는조직공학용제품이사용되고있으며, 광촉매적특성을이용하여공기오염센서및오염물질제거필터등에도사용되고있다. 이러한 TiO 2 나노섬유는나노섬유의형상및크기에따라다양한응용분야에적용되기때문에변수의통제가중요하다. 이연구에서는공정변수를통해변화하는직경을분석하였다. 공정변수로는인가전압, 노즐-집전판사이의거리, 용액의유입속도를변수로통제했다. 전기방사공정후 TiO 2 나노섬유를 450 o C 에서열처리하였으며 XRD 와 FE-SEM을통해결정상과미세구조를분석하였으며, 공정조건의변화에따라약 200 nm~660 nm의평균직경을갖는것으로나타났다. P1-G4-15 Improving Mechanical Properties of 3D Printing- Based Ceramic Core through Increasing a Forming Density 3D 프린팅기반세라믹중자의성형밀도증가를통한기계적특성향상박혜영 *, 김수찬, 최현희, 김봉구, 조근호, 김은희, 정연길. 창원대학교최근 3D 프린팅공정과유기 무기바인더전환공정을결합한새로운세라믹중자제작공정이제안되었으나세라믹중자의내열성과고온강도를발현하기위하여 SiO 2 와 Al 2 O 3 가주성분인뮬라이트계의비드입자 (250 um) 를출발입자를적용할경우, 시험편내낮은성형밀도와많은기공으로인하여충분한파괴강도를발현하지못하였다. 따라서, 본연구에서는뮬라이트비드입자에입도및성분이상이한뮬라이트분말 (16 um) 및지르콘플라워 (43 um) 를혼합 126 한국세라믹학회

137 포스터발표 I 한복합출발물질을적용하여시험편의성형밀도증가를통해세라믹중자의강도특성을향상시키고자하였다. 출발분말과분자량의차이가큰두가지의 poly vinyl alcohol (PVA) 수용액을혼합하여 3D 프린터로제작된시험편은저분자량의 PVA 를 250ºC 에서 4 시간열처리하여제거하여무기바인더가코팅될공간을확보하였으며, 규산염과금속알콕사이드로구성된무기바인더전구체에침지한후, 1000ºC 에서열처리를통해강도를발현시켰다. 출발분말의복합화를통하여, 세라믹중자시험편의성형밀도증가와기공감소를미세구조분석으로확인하였으며, 이에무기바인더코팅효율과유리질전환효율의증가로강도특성을향상시켰다. 또한용출성평가를통하여 100% 의용출성을확보하였으며, 무기바인더의반복코팅을수행하여우수한강도특성을갖는세라믹중자의제작이가능함을확인하였다. P1-G4-16 Dual Coating Process to Improve Hygroscopic Property of Inorganic Binder 무기바인더흡습성개선을위한이중코팅공정최현희 *, 김봉구, 박혜영, 이혜주, 조근호, 김은희, 정연길. 창원대학교기존의사형주조는출발물질과유기바인더를혼합하여주형을제조하며, 제조공정이간단하고낮은생산비용으로인해주조산업에서널리사용되어왔다. 하지만주조중고온에서유기바인더의분해로인해주형에결함이생성되고붕괴되거나수축 팽창으로인해복잡하고정밀한주조품을형성하기에어려움이있다. 이를해결하기위하여유기 무기바인더전환공정이제시되었으나, 열처리전상온에서장시간보관시에는수용성인무기바인더의흡습성으로인해주형의강도저하및파손이발생하게된다. 따라서, 본연구에서는무기바인더의흡습성을개선하기위해유기바인더를재코팅하는이중코팅공정을도입하여기존의공정과비교하였다. 제작된시편은기존의무기바인더전구체 (TEOS: SiO 2 전구체와 NaOMe: Na 2 O 전구체 ) 용액에침지하고건조과정후, 유기바인더용액 ( 수용성 PVA 및 PU, 비수용성 PS) 에침지및건조하였고, 1000 o C에서열처리를하여유기 무기전환공정으로유리질을형성하였다. 접촉각측정결과, 기존공정의시편에서는흡습성이매우커서접촉각의측정이불가능했지만유기바인더로재코팅한시편에서는접촉각이증가되었다. 그중비수용성 PS를적용하였을경우, 가장높은접촉각이측정되었다. 또한, 강도특성및미세구조비교에서도비수용성유기바인더코팅층의영향으로성형및소성강도가유지및증가되며무기바인더의흡습성을개선시킴을확인할수있었다. P1-G4-17 Study on High-yield and Environmental-friendly Fabrication of Nanoporous Anodic Aluminum Oxides and their Applications 나노다공성양극산화알루미늄의친환경및고수율제작및응용성연구홍영기 1*, 정석환 1, 김선국 1, 박동혁 2. 1 성균관대학교, 2 인하대학교알루미늄을산성전해질에서전기장을인가하여산화시킬경우, 나노미터수준의지름을가지며종횡비가상대적으로큰나노기공들이주기적으로정렬된나노다공성산화막이표면에생성된다. 이와같은양극산화알루미늄을알루미늄에서분리하여 1차원나노물질의제작을위한템플레이트, 필터 / 마스크, 바이오센서및에너지저장소자등다양한분야에활용하는연구결과들이활발히보고되고있다. 그러나, 기존의기술은알루미늄의단일표면에서양극산 화알루미늄을형성하기때문에수율이상대적으로낮은단점이있다. 또한, 인체및환경에유해한시약으로알루미늄을녹이는방법을통해양극산화알루미늄을분리하기때문에제한된자연자원을비효율적으로활용하게된다. 본발표에서는다중면동시양극산화및계단형역전압에의한직접분리기술을이용하여기존기술의문제점을최소화하고양극산화알루미늄을친환경및고수율로제작하는방법을보고한다. 계단형역전압을이용한양극산화알루미늄의직접분리는양극산화가진행된동일한전해질에서수행되기때문에유독성시약의사용을배제할수있을뿐만아니라알루미늄을재사용할수있다. 또한, 다중면동시양극산화및직접분리기술은남아있는알루미늄이소진될때까지반복적용이가능하므로자원활용을극대화할수있는장점이있으며, 이에의해제작된양극산화알루미늄은반복회차에무관하게동일한구조적특성을보여주었다. 본연구를통해제작된양극산화알루미늄을나노다공성템플레이트로사용하여 π- 공액고분자나노튜브및금나노선을합성하였으며, 지름등과같은크기에따른물리적특성변화를관찰하였다. 또다른응용사례로서양극산화알루미늄을기반으로용량형습도센서를제작하여소자성능을평가하였다. 기존의연구결과는상대습도가높은구간에서정전용량이변화한데반하여, 본연구에서는전극위치및양극산화알루미늄구조의최적화를통해정전용량이상대습도가상대적으로낮은구간에서도선형적으로변화하는특성을보여주었다. P1-G4-18 Synthesis and Characterization of Ceramic Ink for Ink-jet Printing 잉크젯프린팅용고화도세라믹잉크의합성과프린팅특성연구이지현 1*, 한규성 2, 황해진 1, 권종우 2, 김진호 2, 황광택 2, 조우석 2. 1 인하대학교, 2 한국세라믹기술원잉크젯프린팅기술은디지털화된디자인데이터와원하는위치에선택적으로잉크를토출시키는미세액적토출방식을이용하여디자인패턴을구현하기때문에잉크의효율이매우높고디자인변경및종류에제한이없다. 이러한잉크젯프린팅기술을전통적산업인세라믹타일생산에적용하면소품종대량생산방식에서다품종소량생산방식으로변화하고있는산업패더다임전환속에서도경쟁력확보를기대할수있다. 일반적으로타일의소성공정은 1000 o C 이상의고온에서이루어지기때문에프린팅타일공정에서는고온에서도안정적인발색유지가가능한고화도세라믹안료가필요하다. 이러한고화도세라믹안료를잉크화하여잉크젯프린팅에적용시키고, 원활한잉크토출까지달성하기위해서는적절한점도, 표면장력, 안료입도, 분산안정성과같은요구조건을충족시킬필요가있다. 본연구에서는잉크젯프린팅에적용가능한고화도세라믹잉크를제조하고그에대한프린팅특성을확인하였다. 세라믹잉크젯프린팅에사용된고화도세라믹안료는고상법에의해합성되었고, XRD, SEM, CIE L*a*b* 에의해안료의결정구조, 크기, 형상, 발색특성이확인되었다. 합성된고화도세라믹안료를잉크젯프린팅에서요구하는적정입도로미립화하기위하여고에너지밀링법을이용하였고, 요구입도이하로미립화되었다. 미립화된세라믹안료는용매와혼합을통해잉크화되었고, 잉크젯프린팅에서요구하는점도, 표면장력및분산안정성을충족시키기위해기능성첨가제들이첨가되었다. 이러한과정을통해합성된세라믹잉크는 multiple light scattering (MLS) 방법과 dropwatcher test 를통해분산안정성및프린팅특성이확인되었다. 한국세라믹학회 127

138 2018 년한국세라믹학회춘계연구발표회 P1-G4-19 3D Porous Structures Prepared by Pattern Transfer Printing 패턴전사인쇄로제조한 3D 다공성구조물전창준 *, 최용호, 정영훈, 윤지선, 백종후, 홍연우, 조정호. 한국세라믹기술원 The three-dimensional (3D) porous structures were fabricated by pattern transfer printing for applications of electrodes in gas sensors. In order to form replica patterns, the solutions were mixed with acetone, toluene, heptane, and poly(methyl methacrylate) (PMMA). The replica patterns can be also formed on the several substrates such as polyimide, polydimethylsiloxane (PDMS) and silicon. The wide range of line widths from 5 μm to 16 nm were obtained through the surface grating patterns of master substrates and molecular selfassembly process. The cross-bar patterns with 40 layers showed a thickness of 600 nm. The areas of platinum (Pt) transferred patterns with different line widths were enhanced to 20 mm 25 mm size, which would be applicable to various electrode patterns of gas sensors. P1-G4-20 High-throughput Roll-to-roll Fabrication of Flexible Thermochromic Coatings for Smart Windows with VO 2 Nanoparticles 이산화바나듐나노입자대량생산방법및롤투롤공정을이용한투명유연한열변색스마트윈도우용대면적코팅생산방법김영광 *, 유상배, 박재성, 윤다섭. POSTECH VO 2 -based nanothermochromics that utilizes the dispersion of VO 2 nanoparticles in passive host matrix has been evaluated as a economic strategy of energy-saving smart windows to reduce energy consumption for heating and air conditioning in building. Here, we demonstrate a high-throughput roll-to-roll fabrication of thermochromic coatings for smart windows that can adapt their optical properties in accordance with external temperature. A large quantity (250 g) of VO 2 nanoparticles (NPs) was synthesized at a time by controlled thermal treatment of bead-milled V 2 O 5 NPs as a fast and inexpensive method. The amorphous nature of bead-milled V 2 O 5 NPs combined with nanometer size kinetically facilitates uniform synthesis of high-quality VO 2 NPs even under the less-reducing condition than that used to obtain bulk VO 2. This mass production of VO 2 NPs could be used to fabricate the largest VO 2 /PVP composites thermochromic coatings (12 cm 600 cm) yet produced with excellent infrared modulation ability (~ 45%). This scalable and continuous production of large coating with thermochromic NPs will accelerate the commercialization of thermochromic coatings for smart windows, which will contribute to a large reduction in energy consumption to heat or cool buildings. P1-S41-1 Control of Methylbenzene Selectivity using Co 3 O 4 Sensors Coated with TiO 2 and SnO 2 Catalytic Overlayers TiO 2 및 SnO 2 코팅에의한 Co 3 O 4 센서의메틸벤젠선택성조절임겨레 1*, 정현묵 1, 정성용 1, 김재혁 1, 김보영 1, 김준식 1, 장호원 2, 이종흔 1. 1 고려대학교, 2 서울대학교분무열분해로합성한요크셸 -Co 3 O 4 나노구조체의감응막을형성하고전자빔증착으로촉매활성이우수한 TiO 2, SnO 2 감응막을추가적으로도포하여일반적인 Co 3 O 4 센서로는선택적검지가어려웠던자일렌, 톨루엔등의메틸벤젠가스를선택적으로검지하였다. 두께 5 nm 의 TiO 2, SnO 2 박막을도포한 Co 3 O 4 센서는 250 o C 에서 5 ppm 농도의자일렌과톨루엔가스에대해우수한감도를나타내었고타환원성가스에대해높은선택성을나타냈다. 또, 코팅된 TiO 2, SnO 2 박막의두께변화는가스감도및선택성을크게변화시켰다. 본센서의우수한메틸벤젠감응특성은반응성이낮은메틸벤젠가스가촉매활성이높은 TiO 2, SnO 2 박막을통과할때고반응성의다른가스로변환된후감응물질인 Co 3 O 4 에효율적으로도달하기때문인것으로판단된다. P1-S41-2 Improved NO 2 Sensing Performance by P-N Heterostructure based on WO 3 Decorated NiO Nanobeads WO3@NiO 이종접합을이용한 NO 2 감지특성향상이승엽 1*, 송영근 2,3, 강종윤 3. 1 KU-KIST, 2 고려대학교, 3 한국과학기술연구원 Monitoring the indoor air quality have been attracting much attention because over 80% human activity conducted indoor. In the interior, there are many contaminants including NO 2, NH 3, H 2 S and volatile organic compounds (VOCs). Especially, NO 2 is well known as one of the most toxic gases emitted from stoves, heater and automobile smoke and so on, which seriously induces bronchial diseases and irritant affecting the mucosa of eyes and nose. To detect and monitoring the NO 2, there are extensive efforts via nanostructures with metal additives or p-n junctions but still remain challenging to sensitivity and selectivity for practical application. In this study, we investigated the facile and effective strategy for highly sensitive and selective NO 2 sensors based on WO 3 decorated NiO nanobeads by RF sputtering using 750 nm-diameter polystyrene beads as a soft-template. NiO is representative p-type oxide semiconductor that is advantageous for formation of heterojunctions and endurance to humidity due to their unique surface and catalytic reaction. In addition, WO 3 is well known as the effective catalyst for NO 2. Our results show that the highly ordered WO 3 decorated NiO nanobeads have superior sensing properties to NO 2 because of their structural and catalytic effect including electrical and chemical sensitization. We confidence that the WO 3 decorated NiO nanobeads stands as effective high-performance NO 2 sensors. P1-S41-3 Highly Sensitive and Selective rgo/sns 2 bsed Chemoresistive Gas Sensors 고감도고선택성 rgo/sns 2 기반가스센서박서연 *, 김연후, 김태훈, 장호원. 서울대학교 Nitrogen dioxide (NO 2 ) gas is one of the most harmful gases to health and an air pollutant produced during combustion of fossil fuel, industrial factories and power plants. NO 2 is widely known for its adverse effects on the human body even at low ppm that health and safety guidelines suggest that even 3 ppm or less NO 2 gas influences our health including olfactory paralysis. Therefore, the development of new sensors to detect NO 2 in the environment which are important for improving the quality of environment and avoiding deterioration in our health and quality of life. Two-dimensional (2D) materials including graphene-based materials and transition metal dichalcogenides materials are receiving significant attention as gas sensing materials due to their high surface area, numerous abundant sites, and excellent mechanical flexibility. Herein, we demonstrate chemoresistive gas sensors with excellent 128 한국세라믹학회

139 포스터발표 I selectivity and ultrahigh sensitivity based 2D rgo and 2D SnS 2 hybrid composites. The significant enhancement of the composite s sensing performance is due to the electronic sensitization due to p-n heterojunction formation and porous structures between the rgo and SnS 2. P1-S41-4 Gas Sensing Properties of Au-doped Tungsten Oxide prepared from (NH 4 ) 2 WS 4 Precursor (NH 4 ) 2 WS 4 precursor를이용하여만든 Au 도핑된 Tungsten Oxide 기반가스센서의가스감지특성김태훈 1*, Amirhossein Hasani 2, 김연후 1, 박서연 1, 김수영 2, 장호원 1. 1 서울대학교, 2 중앙대학교 In this work, we report a facile and low-cost fabrication method of Audecorated tungsten oxide thin film involving solution and annealing processes. It was demonstrated that the (NH 4 ) 2 WS 4 precursor decomposed into WO 3 after annealing at 500 o C. Compared to pristine WO 3 thin film, Au-decorated WO 3 thin film showed higher NO 2 sensing characteristics such as sensitivity, response time and recovery time. Au-decorated WO 3 gas sensor showed three times higher responses and lower 50% response and recovery time than pristine WO 3 gas sensor at 150 o C. We have demonstrated Au-decorated WO 3 thin film with simple fabrication process and this method can be used to decorate another metals such as Ag, Ni, and Mo. Metal-decorated WO 3 thin films are expected to be applicable to sensor array. P1-S41-5 rgo-in 2 O 3 Gas Sensor on Flexible Substrate for Highly Sensitive and Selective Sensing Properties of NO 2 at Low Temperature 유연기판위에코팅된 rgo-in 2 O 3 나노복합체를이용한고성능이산화질소가스센서이건호 1*, 나찬웅 2, 김재혁 1, 김효중 1, 우형식 1, Arunava Gupta 3, 김한기 4, 이종흔 1. 1 고려대학교, 2 한국생산기술연구원, 3 University of Alabama, 4 경희대학교이산화질소 (NO 2 ) 가스는화석연료의연소에의해생성되는대표적인오염물질로서정확한검출이필요하다. 이산화질소를검출하기위한 reduced graphene oxide (rgo)-산화물나노복합체가스센서에대해많은연구가진행되고있다. 본연구에서는, 유연기판 (ITO/APC(Ag-Pd-Cu)/ITO/CPI(colorless polyimide) 다층전극 ) 위에코팅된 rgo-in 2 O 3 가스센서를 rgo 나노시트가포함되어있는 Indium 전구체의용매열합성법을통해제작하였다. 구형의형태를지닌순수한 In 2 O 3 가스센서와비교하여 rgo-in 2 O 3 가스센서는 150 o C에서 500 ppb 농도의이산화질소에대한감도가높게 (R g /R a = 22.3) 나타났으며, 에탄올, 일산화탄소, 암모니아, 톨루엔, 수소, 포름알데히드에대해서높은선택성을보였다. 본센서의높은감도는 P-type의 rgo 시트가이산화질소에대한높은화학적친화도를가지고있으며, n-type의 In 2 O 3 와 p-n 접합을통해 rgo 부분의정공농도를조절할수있기때문인것으로판단된다. P1-S41-6 Enhanced NO 2 Sensing Chracteristics of CdS Nanoflake Array at Room Temperature under Visible Light 가시광선조사에의한균일하게배열된 CdS 나노조각이산화질소센서의가스감응특성향상문영국 *, Hua-Yao Li, 윤지원, 이철순, 임겨레, 윤지욱, 이종흔. 고려대학교 화학기상증착법 (CVD) 을이용하여균일하게배열된 Cadmium Sulfide (CdS) 나노구조를합성하고, 녹색파장의빛 ( 파장 nm, 방사조도 21 W/m 2 ) 을조사하여센서의가스감응특성을분석했다. 5 ppm 농도의이산화질소가스에대해서비교적높은가스감응특성 (89%) 을나타내었고다른가스 ( 황화수소, 암모니아, 트리메틸아민, 아세톤, 에탄올, 벤젠, 톨루엔, 자일렌 ) 에비해높은선택성과낮은습도의존성을나타내었다. 이러한가스감응특성은가시광선영역에서광전자를생성시킬수있는 CdS 의작은밴드갭 (2.4 ev) 과균일하게배열된나노조각구조에의해개선된광흡수와전기전도도의향상으로인한결과라고판단된다. 또한 CdS 센서는형광램프나태양광에서도반응할수있으므로의료진단과실내 / 외의공기상태를점검하는데사용될수있을거라전망된다. P1-S41-7 NiO/NiWO 4 Composite Yolk-shell Spheres for Highly Sensitive and Selective p-xylene Sensor NiO/NiWO 4 복합체난황구조를이용한고감도, 고선택적자일렌센서설계김태형 *, 곽창훈, 이종흔. 고려대학교자일렌과톨루엔같은메틸벤젠은대표적인실내오염물질로두통, 어지러움, 가려움증, 피로등을동반하는새집증후군의원인이된다. 따라서미량의메틸벤젠을고감도, 고선택적으로검지하는것이매우중요하다. 본연구에서는초음파분무열분해공정을통해 NiO/NiWO 4 복합체난황구조를합성하고미량의자일렌을선택적으로검출하는센서를제작했다. NiO/NiWO 4 복합체난황구조는순수한 NiO 난황구조에비해크게향상된가스감응특성을보였다. 특히, 자일렌에대해가장높은가스감도를보였으며, 에탄올, 암모니아, 일산화탄소, 수소, 벤젠등의방해가스에대해큰선택성을나타냈다. 이와같이자일렌에대한큰가스감도및선택성을나타내는것은난황구조의넓은비표면적과용이한가스접근성, p(nio)- p(niwo 4 ) 접합형성에의한저항변화증가, NiO와 NiWO 4 의촉매효과에의한것으로판단된다. P1-S41-8 Knittable and Wearable Gas Sensors using Reduced Graphene Oxide Covered Carbon Fabrics Decorated with Metal Catalysts for Enhanced Selectivity 선택성을위해금속촉매와 reduced graphene oxide를탄소섬유에덮은착용가능한가스센서이충원 *. 서울대학교 In recent days, gas sensors have been attracting great interests for various purposes such as monitoring indoor air quality, detecting harmful gases, or providing information on food storage. Among them, researches on gas sensors to detect the gaseous substances from human body have been extensively conducted. The composition of gaseous substances from human activity like breathing contains information about health status such as diabetes, respiratory diseases, or even cancers. Even if there exist various gas sensor technologies to detect those substances from human breath, however, they cannot continuously monitor every single breath due to their rigid platform restricting them from being attached close to human breath. Therefore, gas sensors with a simple and flexible structure with capability of positioning near human breath are required. Here, we report knittable and wearable gas sensors based on reduced graphene oxide (rgo) covered carbon fabrics (CFs) decorated with metal catalysts for enhanced selectivity. The rgo junctions between rgo covered CFs synthesized by annealing graphene oxide (GO) 한국세라믹학회 129

140 2018 년한국세라믹학회춘계연구발표회 electrodeposited CFs, function as an active material for gas sensing, and metal catalysts (Cu, Pt, and Pd) were decorated to enhance selectivity between various gases (H 2 S, H 2, volatile organic compounds). Since CFs are flexible and soft, gas sensors based on them are knittable and ultimately capable of direct application into clothes, the optimal location for monitoring human breath. P1-S41-9 Improvement of Gas Sensing Properties of Semiconductor Gas Sensor by Adding Branches and Metal Catalysts 브랜치및금속촉매에의한반도체식가스센서의센싱특성향상김현우 *, 최명식, 방재훈, 엄완식. 한양대학교일차원나노와이어기반의가스센서는높은표면적-부피비율 (surface-to-volume ratio) 을가지기때문에민감도와선택성이뛰어난장점을가지고있으며, 이에따라많은연구가진행되고있다. 이번실험에서는두번의 Vapor-Liquid-Solid (VLS) 공법을통하여 SnO 2 나노와이어위에브랜치복합구조를형성하였으며, 복합구조위에금속촉매를형성시켰다. 브랜치와금속촉매에의해 SnO 2 나노와이어는형상및미세구조가변했고이는 Scanning Electron Microscope (SEM), X-ray diffraction (XRD), 그리고 Transmission Electron Microscope (TEM) 을통하여분석되었다. 가스센싱테스트를통하여브랜치와금속촉매가기능화된 SnO 2 나노와이어는기존 SnO 2 나노와이어기반센서에비해높은감응특성을보였다. P1-S41-10 Low-power-consumption Gas Sensor based on Suspended Carbon Nano-heater 공중부유형탄소나노히터기반저전력가스센서임영진 *, 김태중, 권영민, 백정민, 이윤식, 신흥주. UNIST We developed a low-power-consumption gas sensor built on a suspended carbon nano heater. This gas sensor was fabricated using only batch fabrication processes such as carbon-mems, atomic layer deposition and hydrothermal method. Without any complex and expensive nanofabrication technologies, ZnO nanowires were grown selectively on a suspended carbon-nanowire-based heater. Because of the small size and good thermal insulation of the nanowire-type heater, the metal oxide nanowire-based sensor could detect various gases such as NO 2, CO, SO 2 and H 2 with small power consumption (~ 1.2 mw). In this presentation, we will introduce the detailed fabrication processes, thermal characterization of the nano-heater, and sensor performances. P1-S41-11 Gas-phase Substitution Synthesis of Mn 3 O 4 -decorated ZnO Nanobelts, ZnO-ZnMn 2 O 4 Nanocables, and Mn 3 O 4 Nanowires from ZnO Nanobelts and their Gas Sensing Applications ZnO nanobelts로부터기상치환된 Mn 3 O 4 -decorated ZnO nanobelts, ZnO-ZnMn 2 O 4 nanocables, Mn 3 O 4 nanowires의합성및그들의가스센서응용나찬웅 1*, 나찬웅 1, 권정현 1, 정재호 2, 이종흔 2. 1 한국생산기술연구원, 2 고려대학교 Single-crystalline Mn 3 O 4 nanowires were prepared by gas-phase conversion of ZnO nanobelts. Mn 3 O 4 -decorated ZnO nanobelts and ZnO-ZnMn 2 O 4 core-shell nanocables (NCs) were also obtained as reaction intermediates. The heteroepitaxial correlation at the interface between ZnO and Mn 3 O 4 or that at the interface between ZnO and ZnMn 2 O 4 provided a novel mechanism for growing single-crystalline Mn 3 O 4 NWs. Note that the C 2 H 5 OH responses of Mn 3 O 4 -decorated ZnO NBs are significantly higher than those to the other gases over the entire sensor temperature range ( C). The C 2 H 5 OH responses in Mn 3 O 4 -decorated ZnO NWs showed a maximum value (30.4) at 400 C. In contrast, the gas responses of ZnO-ZnMn 2 O 4 NCs or the Mn 3 O 4 NWs to the various gases were similar ( ), and no significant selectivity to a specific gas was observed for those sensors. Various one-dimensional homonanostructures and heteronanostructures consisting of n-zno, p-mn 3 O 4, and p-znmn 2 O 4 can be used to design high-performance gas sensors. P1-S41-12 Synthesis and Gas Sensing Properties of Au/In 2 O 3 by Thermal Decomposition 황진아 1*, 전명표 2, 주병권 1. 1 고려대학교, 2 한국세라믹기술원 In 2 O 3 nanoparticles decorated with Au catalysts were synthesized by thermal decomposition. Their gas sensing properties to CO gas and morphologies were investigated with a gas sensing equipment, X-ray diffractometer (XRD), SEM and transmission electron microscopy (TEM). Previously prepared In(NO 3 ) 3 aqueous solution is heated to 100 C and then HMTA () is added into this solution and reacted for 2 h. After that, the solution was cooled to room temperature, centrifuged, washed with ethanol and dried at 100 C. Intermediate phase In(OH) 3 was dispersed in deionized water in Ice bath, in which HAuCl 4 and NaBH 4 was added, and then maintained for 2 h. Just as HAuCl 4 and NaBH 4 was added, the color of the solution changed brown immediately. Final products were centrifuged, washed with ethanol, dried at 100 C and calcined at 300 C for 2 h in order to obtain Au/In 2 O 3 nanoparticles, whose morphologies were almost spherical shapes of about 20~30 nm in diameter in FE-SEM images, including some elongated particles. P1-S D Layered Semiconductor MoS 2 and its Application as an Ultra-sensitive No 2 Gas Detector 2차원물질 MoS 2 와고감도 NO 2 가스센서로서의응용임혜린 *. 성균관대학교 2D layered semiconducting materials have drawn attention recently as a next generation advanced electronic material. Molybdenum disulfide (MoS 2 ), a representative of 2D layered materials family, exhibits remarkable performances such as high electrical mobility, high on/off ratio, flexibility, and transparency and has a potential to be applied to active matrix in sensor system through these advantages. Nitrogen dioxide (NO 2 ) is a prominent air pollutants from fossil fuels and if human is exposed to NO 2 even in small concentration, it can cause respiratory and lung disorders. Therefore, NO 2 gas sensor should be capable of sensing NO 2 accurately in low concentration. MoS 2 transistor sensors exhibit high sensitivity and fast response to NO 2 gas owing to its sulfur vacancies on the surface. In this paper, we demonstrated MoS 2 based NO 2 gas sensor which can react to 0.05 sccm NO 2 under N 2 ambient with high sensitivity. P1-S41-14 Pt Nanoparticles Functionalized Tungsten Oxynitride Hybrid Chemiresistor: Low-Temperature NO 2 Sensing Pt 나노입자촉매가기능화된텅스텐산질화물저항변화식저온동작 NO 2 센서김동하 1*, 정지원 1, 최선진 2, 장지수 1, 구원태 1, 김일두 1. 1 KAIST, 2 MIT 130 한국세라믹학회

141 포스터발표 I Semiconducting metal oxides (SMOs) based gas sensors are inherently hampered by requirement of high working temperature because of their wide bandgaps. Consequently, there are remain challenges to utilize SMOs based gas sensors with regard to continuous gas monitoring platform with low power consumption. To address the inherent limitation, nitridation (i.e., N doping) of WO 3 NFs to WO x N y NFs was herein introduced for realization of lowtemperature NO 2 sensing. Importantly, nitridation was conducted at intervals of 50 C from 400 to 600 C to adjust the degree of phase transition from semiconducting WO 3 to conductive WON phases. To further optimize the conductivity and improve the sensing characteristics, i.e., reduction of optimal operating temperature and enhancement of sensitivity, WO x N y NFs were functionalized with platinum (Pt) catalytic nanoparticles (NPs) by physical mixing. Pt NPs functionalized WO x N y NFs nitrided at 550 C exhibited improved sensitivity of 7.17% toward 5 ppm of NO 2 at 50 C, and superior selectivity against C 2 H 5 OH, C 7 H 8, CH 4, CO, NH 3, and NO. The noble metal catalyst-metal oxynitride hybrid system is suggested as an effective NO 2 sensing platform for low-temperature chemical sensor. P1-S41-15 Synthesis and Gas Sensing Properties of Ag Nanostructure Decorated Reduced Graphene Oxide Films 은나노구조가기능화된 RGO기반 2-d 가스센서물질의합성및특성평가정영규 *, 권용중. 한국생산기술연구원 In these days, graphene has attracted lots of interest in a variety of fields, including a gas sensor. RGO (Reduced Graphene Oxide) is a kind of chemically reduced graphene that is functionalized by oxygencontaining functional groups such as aldehyde, ketone, carboxylic acid, and alcohol. For improving sensing abilities, we synthesized Agrelated nanostructure decorated Reduced Graphene Oxide that implies great sensitivity to Hydrogen sulfide gas. The synthesis process was carried out using GO solution mixed with AgNO 3, NaOH, and DI water. XRD spectra revealed that the Ag-related nanostructure decorated RGO is composed of not only Ag phase, but also different types of Ag-Oxide phases. To measure the gas sensing signal of Agdecorated RGO films on the SiO 2 /Si substrate, Au/Ti electrodes (150 nm thickness) was deposited. The diluted hydrogen sulfide gas was passed through the sensing chamber. Air was used as the reference gas, and the total flow rate for the sensing test was maintained at 500 sccm. For additional analysis, Ag-decorated RGO sensing materials were investigated field-emission scanning electron microscopy and transmission electron microscopy. Raman spectra were measured at room temperature. P1-S41-16 Ag Nanowires Embedded Glass-fabric/Siloxane Hybrid Heater Substrate: Flexible Sensing Platform for Catalystdecorated Metal Oxide Nanosheet 유연한가스센서소자를위한은나노와이어가내장된하이브리머히터와결합된촉매결착된금속산화물나노쉬트장지수 *, 김동하, 구원태, 김일두. KAIST The development of flexible chemiresistor is imperative for real-time monitoring of air quality and/or human physical conditions without space constraints. However, critical challenges such as poor sensing characteristics, vulnerability under toxic chemicals, and weak reliability hinder their commercialization. In this work, for the first time, we report the ultra-sensitive flexible sensing platform by assembling Pt loaded thin-layered (~10 nm) SnO 2 nanosheets (Pt- SnO 2 NSs) on Ag nanowires embedded glass-fabric reinforced vinylphenyl siloxane hybrid composite substrate (AgNW-GFRVPH film). Formation of ultra-thin layered Pt-SnO 2 NSs resulted in the mechanical flexibility as well as superior response (R air /R gas = 4.84) toward 1 ppm level dimethyl sulfide (DMS), stemming from highly porous and sub 10 nm thickness of Pt-SnO 2 NSs. Meanwhile, thermally stable AgNW-GFRVPH film was fabricated by free radical polymerization of vinyl groups in vinyl-phenyl oligosiloxane (VPO) and phenyltris(dimethylvinylsiloxy)silane (PTV) with Ag NW and glass-fabric, showing outstanding heat-generation (~200 o C), high dimensional stability (13 ppm/ o C), thermal stability (~350 o C), and optical transparency (~90%). Careful combination of Pt-SnO 2 NSs with AgNW-GFRVPH film provided extremely stable flexible gas sensing platform. P1-S41-18 Ultrasmall Pt Catalyst Loaded Mesoporous SnO 2 Nanofibers via Chitosan-Metal Complex Templating Route: Toward Superior Acetone Sensor 키토산 -금속복합물을템플릿으로한극소백금촉매가결착된다공성의주석산화물나노섬유 : 우수한아세톤센서로의적용정용진 *, 구원태, 장지수, 김동하, 조희진, 김일두. KAIST In the semiconducting metal oxides (SMOs) based gas sensor, nanostructuring and catalytic activation should be simultaneously controlled to maximize the improvement of sensing characteristics. Especially, mesoscale (2-50 nm) pores facilitate Knudsen diffusion of gases, thereby leading to the effective reactions with sensing layer. In addition, the smaller the grains, the more sensitive is the sensor due to the enhanced modulation of electron depletion region when the SMOs react with target gases. With regard to the catalytic functionalization, small size catalyst should be uniformly distributed on the SMOs to significantly enhance the effectiveness of the catalyst. In this work, we first demonstrate chitosan-metal complex (CS-M) derived ultra-small catalyst loaded porous SMOs nanofibers (NFs) toward high performance chemiresistor. The synthesized Pt nanoparticles of chitosan-pt complex (CS-Pt) exhibited ultra-small size (~ 2.6 nm) with high dispersibility. Then, we combined CS-Pt with electrospinning, thus resulting in SnO 2 NFs functionalized by uniformly distributed Pt nanocatalyst. In addition, during the calcination, mesopores and small grain size of the SnO 2 were derived by the effects of the CS. In this study, we discussed the three main effects of the CS, i.e., (i) uniformly distributed ultra-small Pt NPs, (ii) mesopores, and (iii) small grain size of sensing materials, in terms of superior acetone-sensing properties and potential applicability for an exhaled breath analyzer. P1-S41-19 Dual Sensitization of Pt-ZnO Nanoparticles in Hierarchical Reduced Graphene Oxide for NO 2 Chemiresistors 아연산화물과백금나노입자가기능화된계층구조의환원된그래핀산화물을이용한이산화질소가스센서개발에관한연구강준영 *, 구원태, 장지수, 조희진, 김동하, 김일두. KAIST With the rapid development of industries, the emission of NO 2, wellknown poisonous gas, has increased because the main sources of NO 2 한국세라믹학회 131

142 2018 년한국세라믹학회춘계연구발표회 emission include automobiles and combustion of fossil fuels in power plants. In this sense, wearable NO 2 gas sensing platform that can be applied in wearable application is highly required for those work in harsh environment. In this work, we synthesized Pt and ZnO dualsensitized nanoporous reduced graphene oxide (Pt-ZnO@NPRGO) derived from metal-organic framework (MOF) and graphene oxide (GO) as room temperature NO 2 sensing material. Zn based zeolite imidazole framework (ZIF-8) were grown on the GO due to the strong interaction between GO and ZIF clusters composed of Zn ion and organic linker. Then, Pt ions were encapsulated in the cavity of ZIF-8 using polyvinylpyrrolidone as surfactant and reduced to Pt nanoparticles (NPs) by using sodium borohydride. During the calcination in N2, ZIF-8 were converted into ZnO NPs embedded porous carbon nanocage, while GO were thermally reduced forming Pt- ZnO@NPRGO. Due to their exceptionally high porosity and selective catalytic performances of Pt and ZnO NPs, the Pt-ZnO@NPRGO exhibited excellent sensing performances toward NO 2 in terms of sensitivity, selectivity, and reversible response/recovery kinetics even at room temperature. Moreover, owing to the two-dimensional nature of GO, Pt-ZnO@NPRGO exhibited superior stability in bending state on flexible sensing substrate, i.e., colorless polyimide. P1-S42-1 Microstructure Analysis of Templated-grown of Graphene Pattern 템플릿을통해형성된그래핀의미세구조분석정재훈 *, 최경곤, 예종필. 인하대학교그래핀은 2차원구조의탄소단일층이며전기적 / 열적특성이매우높아전자소자및열전소자로의응용이모색되어왔다. 이러한그래핀의우수한물리적특성을폭넓게활용하기위해서는그미세구조에대한정밀한제어기술의개발이필요하다. 최근 Cu 기판의미세구조와그래핀의미세구조간의상관관계에대한연구가발표된바있으나여전히이를검증할수있는체계적인연구결과가부족하다. 본연구에서는리소그래피패터닝공정과 Cu의열처리공정을접목하여다양한 grain 구조를갖는 Cu template을형성하고이에화학기상증착법을활용하여그래핀을성장시켰다. 이와같이형성된 graphene 패턴의미세구조와 Cu template의형태및 grain 구조간의상관관계를 Electron backscatter diffraction (EBSD) 과 Selected area electron diffraction (SAED) 를사용해분석하였다. 이와같은분석결과, 그래핀의결정구조가 Cu template의 grain 구조에는의존하지않으나 template의 width가그래핀패턴의 edge orientation에영향을미치는것으로나타났다. P1-S42-2 Encapsulation-Free, Air-Stable Monolayer WS 2 Using Graphene Substrate 그래핀기판을활용한 WS 2 의공기안정성향상김세양 *. UNIST In this study, we report the special role of graphene substrates in substantially enhancing the air-stability of two-dimensional transition metal dichalcogenides (TMDs) flakes. Compared to the well-known, short-term air degradation of TMDs flakes grown on the conventional SiO 2 /Si substrate (representatively, WS 2 /SiO 2 ), epitaxially grown WS 2 flakes on graphene substrate (WS 2 /Gr) maintain their clean and uniform surface without any encapsulation even after a year in ambient air conditions. Our investigations indicate that high crystal quality is one of the key factor that determines the air-stability of TMDs, and we present experimental evidences of the relation between defects and aging progress. Furthermore, we propose the significant contribution of the charge transfer-induced doping effect to the prevention of aging for the first time. This work emphasizes the importance of the substrate for enhancing the stability of TMDs materials and can pave the way for the long-term performance and practical TMDs applications. P1-S42-3 Highly Conductive and Environmentally Stable Graphene-Based Organic Transparent Conducting Film Using Lamination Process 그래핀라미네이션전사법을통한우수한전기전도성과외부환경안정성을지닌유기투명전극형성및연구이도희 *, 주재환, 이도희, 조준현, 김성엽, 유정우, 권순용. 울산과학기술원 Improving the lifetime and the operational stability while maintaining high conductivity and mechanical flexibility is important for flexible electronic applications. In this work, we report that highly conductive and environmentally stable organic transparent electrodes (TEs) can be fabricated by laminating poly(3,4-ethylenedioxythiophene) : poly(styrenesulfonate) films containing dimethyl sulfoxide and Zonyl fluorosurfactant (PDZ films) with a monolayer graphene barrier. The proposed lamination process enables graphene to be deposited onto the PDZ films uniformly and conformally with tight interfacial binding, free of wrinkles and air gaps. The graphene-laminated PDZ films exhibit an outstanding room-temperature hole mobility of ~ 85.1 cm 2 V 1 s 1 since the graphene can act as an effective bypass for charge carriers. Enhanced stability of the graphene-laminated TEs under the harsh conditions is particularly promising. Furthermore, the incorporation of the graphene barrier enhances the estimated lifetime of the TEs under thermal stress by more than two orders of magnitude. This work presents that the operational and thermal stability of organic thin-films can be pursued by employing 2D carbon materials while maintaining high conductivity and mechanical flexibility. P1-S42-4 All-Carbon Composite Electrodes with Uniform Carbon Nanotube Networks for Durable and Transparent Conducting Electrode 균일한탄소나노튜브코팅을포함한저차원탄소복합투명전극 ) 윤형덕 *, 곽진성. UNIST Development of indium tin oxide-free, flexible transparent conductive electrodes (TCEs) is essential for the future commercialization of flexible and wearable electronics. While carbon-based TCEs containing carbon nanotube (CNT) networks show promise, the poor dispersion properties limit their performance and practicality. In this work, we report a highly efficient and bending durable all-carbon composite TCE (ac-tce) that employs uniform CNT networks on a monolayer graphene/polyethylene terephthalate (PET) substrate via a simple air spray deposition method. The excellent performance of the ac-tces was attributed to the uniformly networked CNTs on the polycrystalline graphene with a well-controlled density, effectively bridging the line defects and filling the tears/voids or folds in the asprocessed graphene. The sheet resistance of the ac-tces was increased only 6% from its original value at a bending radius of 2.7 mm, while that of the pristine graphene/pet assembly increased 132 한국세라믹학회

143 포스터발표 I 237%. Mechanical bending of the ac-tces worsened the electrical performance by only ~1.7% after 2,000 bending cycles at a bending radius of 2.5 mm. Degradation of the performance by the bending was the result of line defects formation in the graphene, demonstrating the potential of the uniform CNT networks to achieve more efficient and flexible carbon-based TCEs. The optimized, hole-doped ac-tces shows a typical sheet resistance of ~105 ± 15 ohm/sq at ~90% transparency, closer to practical TCEs in wearable devices. P1-S42-5 3D Graphene-Ni Foam Heterostructures for Highlyefficient and Durable Bipolar Plates in a Polymer Electrolyte Membrane Fuel Cell 높은효율성과내구성을갖는고분자전해질연료전지 (PEMFC) 분리판을위한 3차원그래핀-니켈이종구조심여선 1*, 곽진성 1, 김세양 1, 조용수 1, 김승현 1, 김성엽 1, 김지현 1, 이치승 2, 조장호 2, 권순용 1. 1 UNIST, 2 현대자동차 Improveing the lifetime of polymer electrolyte membrane fuel cells (PEMFCs) is critical for realizing their implementation as a highlyefficient energy conversion system. However, the chemical instability of metal bipolar plates in the destructive operating environment inside PEMFCs leads to decreased performance and durability. Therefore, rational interface passivation techniques are critical for further boosting the development of PEMFCs. In this work, we report a novel method for coating highly-crystalline multilayer graphene (Gr) as a superficial protective film (thickness of ~10 nm) onto 6 x 6 cm 2 Ni foam within short duration (t 5 min) via the facile and rapid radiative heating of poly(methyl methacrylate) as a solid-state C source. The resulting 3D Gr-coated Ni foam is demonstrated to act as a bipolar plate with long-term operating stability. Electrochemical analysis revealed that the 3D Gr-coated Ni foam outperforms bare Ni foam and amorphous-c-coated Ni foam by providing a two-order-ofmagnitude lower corrosion rate in the operational environment for a PEMFC. After stability tests in aggressive environments, the 3D Grcoated Ni foam retained its outstanding ICR of 9.3 mω cm 2 at 10.1 kgf cm 2. A H 2 /air PEMFC fabricated using the Gr-coated Ni foam as bipolar plates showed a substantially enhanced maximum power density of ~967 mw cm 2. Our facile coating approach can pave the way to further enhance energy conversion systems through interface engineering. P1-S42-6 Ambient Air Oxidation Behavior of Intrinsic Graphene Defects for Different Origins on Copper 구리기판위에성장된그래핀의다양한결함에서의공기산화거동조용수 *, 곽진성, 박순동, 김나연, 김세양, 이종훈, 김성엽, 권순용. UNIST The development of ultrathin barrier films is vital to the advanced semiconductor industry. Graphene appears to hold promise as a protective coating; however, the polycrystalline and defective nature of engineered graphene hinders its practical applications. Here, we investigate the oxidation behavior of graphene-coated Cu foils at intrinsic graphene defects of different origins. Macro-scale information regarding the spatial distribution and oxidation resistance of various graphene defects is readily obtained using optical and electron microscopies after the hot-plate annealing. The controlled oxidation experiments reveal that the degree of structural deficiency is strongly dependent on the origins of the structural defects, the crystallographic orientations of the underlying Cu grains, the growth conditions of graphene, and the kinetics of the graphene growth. The obtained experimental and theoretical results show that oxygen radicals, decomposed from water molecules in ambient air, are effectively inverted at Stone-Wales defects into the graphene/cu interface with the assistance of facilitators. P1-S42-7 Crumpled Reduced Graphene Oxide for Highly Efficient Supercapacitor 고효율슈퍼캐패시터용 Crumpled Reduced Graphene Oxide 명윤 1*, 최재원 2, Ramesh Raliya 3, Pratim Biswas 3, Parag Banerjee 3. 1 세종대학교, 2 한국과학기술연구원, 3 Washington University in St. Louis Crumpled reduced graphene oxide (CGO) were synthesized by aerosol technique. As prepared CGO surfaces were successfully modified using ethylenediamine. Their structural, optical and electronic structure were confirmed by transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The activation energy for conduction in CGO showed the lowest value at 6.5% amine treated CGO, but the conductivity value was lowest at 1% amine treated CGO. Supercapacitor performance measured by cyclic voltammetry and charge-discharge tests. The 1% amine treated CGO showed the highest energy density and power density. P1-S42-8 Highly Durable Cu-Based Electrodes from a Printable Nanoparticle Mixture Ink: Flash-Light-Sintered, Kinetically- Controlled Microstructure 산화안정성이우수한구리나노입자기반의전극 : 광소결공정을통한미세구조제어박혜진 1*, 조예진 1, 조민경 2, 정영우 2, 이수연 1, 최영민 1, 정선호 1. 1 한국화학연구원, 2 한국과학기술연구원 Recently, printable nanomaterials have drawn tremendous attention for low-cost, large-area electronics applications. In particular, metallic nanoparticles that can facilitate a formation of highly-functioning electrodes are indispensable constituent nanomaterials. In this paper, we propose the printable mixture inks comprising multicomponent ingredients of Cu, Ni and Cu/Cu 10 Sn 3 core/shell nanoparticles. It is clearly revealed that a characteristic morphology appropriate to highly conductive and durable Cu-based electrodes can be derived easily in a timescale of about 1 msec through an instantaneous flash-lightsintering process, resulting in a resistivity of 49 μω cm and normalized resistance variation around 1 (after 28 days under harsh environments of 85 o C temperature and 85% humidity). In addition, it is demonstrated that highly-functioning electrodes are also formed on thermally vulnerable polyethylene terephthalate (PET) substrates by incorporating an ultrathin optical/thermal plasmonic barrier layer. P1-S42-9 Negative Photoresponse of WS 2 Film Decorated with Au Nanoparticles Au 나노입자로장식된 WS 2 박막의음의광검출특성김봉호 *, 권순형, 한진희, 윤영준. 한국세라믹기술원 We synthesized WS 2 film decorated with Au nanoparticles (NPs) by sputtering, evaporation and electron beam irradiation (EBI), and investigated the effect of Au NPs decoration on photoresponse of WS 2 한국세라믹학회 133

144 2018 년한국세라믹학회춘계연구발표회 film. The WS 2 film decorated with Au NPs showed photoresponsivity of 39.9 ma/w which was 25.7 times higher than WS 2 film without Au NPs decoration. And Au NPs changed photoresponse of WS 2 from positive to negative under the illumination of 450 nm laser. However, when we compared WS 2 film decorated with Au NPs to WS 2 film without Au NPs decoration, WS 2 film decorated with Au NPs showed longer rising and falling time of 18 and 468 sec, respectively. The origin of enhanced photoresponsivity and the change from positive to negative photoresponse with Au NPs decoration were investigated and the mechanism of negative photoresponse was proposed based on electron trapping and recombination by the acceptor state generated by Au NPs. P1-S42-10 The Origin of High Photoresponsivity in APCVDgrown MoSe 2 Phototransisot APCVD로성장한 MoSe 2 포토트랜지스터의높은광반응성의기원홍성인 1*, 한규철 2, 홍영기 1, 윤영기 2, 김선국 1. 1 성균관대학교, 2 University of Waterloo MoSe 2 grown by atmospheric pressure chemical vapor deposition (APCVD) exhibits a unique structure including interstitial Mo atom between basal planes, unlike usual 2H phase MoSe 2. Thin-film phototransistor based on APCVD-grown multilayer MoSe 2 exhibits an excellent photoresponsivity (103.1 A/W). Although multilayer transition metal dichalcogenides (TMDs) generally indicate low optoelectronic efficiency due to their indirect band gap properties and poor quantum efficiency compared to monolayer TMDs. For demonstrating the fundamental origin of the great photoresponsivity, density functional theory (DFT) calculation and photo-induced transfer properties identify that interstitial Mo atoms induce photoreactive extra states in the energy bandgap. Moreover, models explain photo-amplification current by trapped holes in sub-gap stated leading to the critical photovoltaic effect of MoSe 2. In this paper, APCVDgrown MoSe 2 photoransistors suggest high performance of 2D material for future photosensor applications, identifying the fundamental origin of great photoresponsivity. P1-S42-11 Growth of High-Crystalline Bulk MoSe 2 through Controlling the Gas Flow 가스유량조절을통한결정성이높은벌크 MoSe 2 의합성김정훈 *, 추수호, 임혜린, Liu Na, 김선국. 성균관대학교 Transition metal dichalcogenides (TMDs) have a wide range of applications such as sensors, photodetector and electronic devices due to their controllable band gap and unique optical and electronic characteristics. In this study, we have introduced the synthesis method to control the quality of the bulk MoSe 2 through chemical vapor deposition (CVD) by varying the gas flow of Argon and hydrogen distinguished as a carrier gas and a reducing gas, respectively. Furthermore, the ratio of the Ar and H 2 has been determined in the range of It was observed that the crystallinity of MoSe 2 has been increased with increasing the rate of gas flow. To investigate the crystallinity and uniformity of the bulk MoSe 2 Raman spectroscopy, scanning electron microscope (SEM), energy dispersive analysis of X-rays and X-ray photoelectron spectroscopy were performed. In addition, a MoSe 2 thin film transistor was fabricated with conventional methods on a SiO 2 /Si substrate with Al 2 O 3 passivation. The room-temperature carrier mobility of the MoSe 2 devices is about 21 cm 2 /Vs. This approach of the CVD grown bulk MoSe 2 with high crystallinity may open a novel application in various electronic devices. P1-S42-12 Morphology and Thickness-dependent Photoelectrochemical Water Splitting on WO 3 Nanostructures WO 3 나노구조광전기화학물분해에서의두께와형태의존성조아영 *, 이준봉, 윤철민, 이상우, 이호진, 최택집. 세종대학교 Nanostructures of oxide semiconductors are promising as photoelectrodes for efficient solar water splitting. WO 3 has been extensively studied on photoelectrochemical properties due to its bandgap (2.8 ev) within visible-light region and excellent chemical stability. In this study, we investigated morphology and thickness dependence of photoelectrochemical performances on nanostructured WO 3 photoanodes. We prepared various nanostructures of WO 3 grown on FTO glass substrate by controlling oxygen partial pressure using pulsed laser deposition. By increasing the oxygen partial pressure, surface morphology changed from smooth to rough, accompanied with increasing the porosity of the WO 3 films. We obtained a substantial enhancement of photoelectrochemical performances by optimization of thickness and surface morphology. We will discuss the link between morphology of nanostructures and specific surface area as well as charge trans port path. P1-S42-13 Large-Area Synthesis of NbSe 2 grown by Chemical Vapor Deposition Kwan-Woo Kim *, Sang-Hoon Lee, Bum-Jun Kim, Hyung-Kyu Lim, Nasir Tuqeer, Ik-Jun Choi, Byeong-Ju Jeong, Min-Ki Son and Jae- Young Choi. Sungkyunkwan University Transition metal dichalcogenides (TMDCs) nanomaterials have attracted intense attention because of their unique structure and properties. Niobium diselenide (NbSe 2 ) is one of the TMDCs and it is exceptionally attractive material because of the presence of both a charge density wave transition and a superconducting transition [1, 2]. Though NbSe 2 layers can be exfoliated mechanically from bulk NbSe 2 crystals, it is not a scalable method. Also, NbSe 2 layer can be grown by molecular beam epitaxial, but it is expensive to perform. Therefore, it is highly desirable to develop a facile synthesis method to produce superconducting NbSe 2. To date, there are only a few papers which reports synthesis of NbSe 2 by Chemical vapor deposition. [3, 4, 5] In this work, we report the facile growth method of the large area NbSe 2 using APCVD and the resulting superconducting property. 1. C Tan, X Cao, et al., Chemical reviews. 117, 6225 (2017) 2. R.V. Coleman, et al., Advances in Physics. 37, 559 (1988) 3. H Wang, et al., Nature communications. 8, 394 (2017) 4. AR Kim, et al., Nano letters. 16, 1890 (2016) 5. N.D. Boscher, et al., European journal of inorganic chemistry (2006) P1-S42-14 Low-Temperature Synthesis of Double Layerless Graphene Growth via MOCVD 더블레이어를억제한저온그래핀합성법 134 한국세라믹학회

145 포스터발표 I Kim Bum Jun *, Jeong Byeong Ju, Lee Sang Hoon, Nasir Tuqeer, Hyung Kyu Lim, Kwan-Woo Kim, Choi Ik Jun, Son Min Ki, Jae-Young Choi. Sungkyunkwan University Graphene, with its excellent physical and chemical properties, is an important material to be studied steadily from 2004 to the present and to continue to utilize its properties. Although graphene has attracted a great deal of attention as a promising material in various fields due to its excellent properties, it has been known as an important research field to control defects due to the degradation of characteristics when graphene defects exist. Among them, Controlling the graphene layer is an important factor affecting the quality, because synthesis of a single layer graphene rather than multiple graphene can greatly improve the optical and electrical properties. So far, graphene has been synthesized at high temperatures using methane as a carbon source. However, economic and industrial problems due to high-temperature synthesis and difficulty in controlling growth condition at high temperatures make it difficult to produce single-layer graphene. Therefore, the problems caused by the high-temperature process and the control of the number of graphene layers must be solved for the development of graphene related research. In this study, we will discuss the synthesis of a single-layer graphene on a copper substrate at low temperatures using benzene. P1-S42-15 Piezoelectric Effect Depends on the Direction of Monolayer MoS 2 for Piezoelectric Energy Nanogenerator MoS 2 단일층의결정방향에따른압전특성분석및이를이용한에너지하베스터김보성 *, 김성균, 김상우. 성균관대학교 Considerable scientific efforts are being expanded towards realizing electronic components for transparent flexible self-powered electronic switches, skins, sensors, etc. Experimental studies on the physical properties of two-dimensional (2D) materials have grown exponentially since 2D materials offer unique advantages for use in such future devices. The physical properties of 2D molybdenum disulfide (MoS 2 ) nanosheets have been actively explored particularly as a result of their possible integration in both nano/microelectromechanical devices and energy harvesting devices. And moreover the calculation of the piezoelectric coefficient for monolayer MoS 2 according to density-functional theory revealed that the monolayer structure exhibits a stronger piezoelectric coupling than the bulk wurtzite structured materials. Nevertheless, experimental evidence of the piezoelectricity of 2D MoS 2 has not yet been sufficiently provided although very recently few studies on the experimental observation of intrinsic piezoelectric properties of MoS 2 reported that the piezoelectricity from MoS 2 only exists when there are an odd number of layers in the 2D crystal. Here we report directional dependent piezoelectric effects in chemical vapor deposition (CVD) grown monolayer MoS 2 using lateral piezoresponse force microscopy (PFM) measurements. In addition, it was found that the piezoelectric power output from piezoelectric nanogenerators (NGs) fabricated with monolayer MoS 2 is strongly dependent on the MoS 2 atomic orientation along either armchair or zigzag direction, which further confirms that the magnitude of the piezoelectric polarization in monolayer MoS 2 significantly depends on the atomic orientation axis of MoS 2. P1-S42-16 Epitaxial Growth of Large-Area Monolayer Singlecrystalline Graphene by CVD CVD를통한대면적단층단결정그래핀의에피택시성장법 Hyung-Kyu Lim *, Sang-Hoon Lee, Bum-Jun Kim, Kwan-Woo Kim, Nasir Tuqeer, Ik-Jun Choi, Byeong-Ju Jeong, Min-Ki Son and Jae- Young Choi. Sungkyunkwan University Graphene, with its excellent physical and chemical properties, has been studied from 2004 to the present and will continue to research its development. Because of its excellent properties, it is used in various electronic devices. However, when defects such as dots, lines, and faces are present, the properties of graphene are greatly degraded. As a method of synthesizing large-area graphene, epitaxial growth of silicon carbide, CVD growth on a metal substrate, and metal assisted precipitation method have been introduced. Unfortunately, So far, most of the large-area graphene developed are polycrystalline, and due to the grain boundary which interferes with the movement of electrons, it is difficult to synthesize graphene with good properties. Therefore, synthesis of single-crystal graphene on a large area is a challenge that must be solved in commercialization of electronic materials with superior properties in the future. In this study, we will discuss single-crystal graphene synthesis based on epitaxial nucleation from a large-area copper substrate recrystallized from a poly-crystal to a single-crystal. We will also discuss the synthesis of monolayer graphene without a double layer in a single crystal. P1-S42-17 Defect-free Graphene Transfer by Plasticized-polystyrene 가소화폴리스타이렌에의한결함없는그래핀전사 Nasir Tuqeer *, Kim Bum Jun, Lee Sang Hoon, Kwan-Woo Kim, Hyung Kyu Lim, Jae-Young Choi. Sungkyunkwan University Since the discovery of graphene in 2004, many approaches to synthesize large-area graphene have been developed. [1] Chemical vapor deposition of graphene on transition metals have paved the way in large scale synthesis. However, CVD Graphene needs to be transferred from growth material i.e transition metals to appropriate substrate like SiO 2 for required applications. Here we report a new material combination of Plasticized-Polystyrene to address major challenges and drawbacks of using polymer support layers for wet transfer of graphene film from transition metals to arbitrary substrates. Our work focuses on removing active bonding links from support material to avoid any unwanted bonding with graphene and residues, improve mechanical properties and flexibility of support film by introduction of plasticizer material to withstand stresses and surface tension of liquid during wet transfer and roll to roll transfer. Making this method viable for clean and efficient transfer of continuous graphene films. P1-S42-18 Properties of Hybrid Materials by Graphene and Carbon nanotube Coated Aluminum 그래핀과탄소나노튜브가코팅된알루미늄복합재의물성황진욱 1*, 김우식 2, 도환수 2, 김혜영 2, 남상용 1. 1 경상대학교, 2 한국세라믹기술원 Graphene and carbon nanotubes (CNTs) had been used for increasing properties of various composite materials such as carbon fiber, cupper and polymer based composites. To improve the properties of 한국세라믹학회 135

146 2018 년한국세라믹학회춘계연구발표회 composite, dispersion of nano materials is very important in matrix material. We fabricated the nano materials coated metal hybrid compound uniformly by self assemble process. Graphene oxide (GO) and CNTs are dispersed solution was prepared by sonication, and surface functionalized aluminum was fabricated by several chemical reactions. The compounds are sintered under continous pressure and the remaining functional groups on the Al-GO with spark plasma sintering (SPS). Then the materials are heated under the melting temperature in tube furnace for stablization. The composites morphology and presence of carbon materials on the surface are observed through scanning electron microscopy (SEM). Also Al composites are analyzed to identify the wavelength of carbon bonding at the surface by Raman and IR spectroscopy. Then some of mechanical properties are measured of the samples about density and hardness. P1-S42-19 Indium Gallium Zinc Oxide (IGZO) Thin-film Transistor Operation based on Polarization Effect of Liquid Crystals from a Remote Gate 액정분극을이용한 Indium Gallium Zinc Oxide (IGZO) 박막트랜지스터김명언 *, 이준형, 김정주, 허영우, 이상욱. 경북대학교 This research presents a new field effect transistor (FET) by using liquid crystal gate dielectric with remote gate. The fabrication of thinfilm transistors (TFTs) was used Indium tin oxide (ITO) for the source, drain, and gate electrodes, and indium gallium zinc oxide (IGZO) for the active semiconductor layer. 5CB liquid crystal was used for the gate dielectric material, and the remote gate and active layer were covered with the liquid crystal. The output and transfer characteristics of the LC-gated TFTs were analyzed and the hysteresis and temperature effects were also investigated. P1-S42-20 Wafer-Scale Homogeneous Growth of Monolayer Tungsten Dichalcogenides Using Metal-Organic Chemical Vapor Depostion 유기금속화학기상증착방법을이용한단일층텅스텐칼코겐화합물의대면적균일성장강희성 *. 고려대학교 Atomically thin transition metal dichalcogenides (TMDCs) have recently attracted tremendous scientific and technological interests as an emerging semiconductor because of their exceptional electrical and optical properties. For practical device applications, the wafer-scale homogeneous growth of high-quality TMDCs is surely required. To date, thermal chemical vapor deposition (CVD) methods by sublimation of solid powder precursors have been widely utilized for the large-area growth. Although those processes produced the TMDCs layers with large grain sizes of a few hundred microns, the uniform growth of TMDCs over a wafer scale still remains unsolved. In this research, we present the wafer-scale growth of monolayer tungsten dichalcogenides using metal-organic chemical vapor deposition (MOCVD). The nucleation density and grain sizes of crystalline tungsten dichalcogenides could be precisely controlled by modulating the various growth parameters. As a result, monolayer WSe 2 and WS 2 were grown uniformly on a 2-inch SiO 2 /Si wafer. We investigated the optical properties of MOCVD-grown films through photoluminescence (PL), Raman spectroscopy, and confirmed that they have high optical quality which is comparable to that of the exfoliated counterpart. In addition, we have successfully demonstrated that the epitaxial WSe 2 /WS 2 hetero-bilayer can be grown by the sequential growth. Furthermore, we will discuss the electronic and optoelectronic device applications of MOCVD-grown TMDCs and their heterostructures. P1-G5-1 The Influence of Nano-TCP and Micro-TCP Powders for the Hardening Strength of Calcium Phosphate Cement 나노 TCP 분말및마이크로 TCP 분말의인산칼슘골시멘트의경화강도에미치는영향장명철 1*, 김병기 1, 김영모 2, 이청천 3. 1 군산대학교, 2 셀바이오, 3 ( 주 ) 지에스엠트인산칼슘계골시멘트는강도값이낮아임상시술에아주소량만사용되어오다가강도증가임상용골대체제로사용되어오고있음. 본연구발표에서는순수한인산칼슘을위주로하는무기질골시멘트의경화반응에의한기계적강도특성변화를연구발표하고자함이목적임. 일반적으로알려져있는상업용인산칼슘골시멘트배합비를기준시료 (reference sample) 조합으로하여주원료인베타형 TCP (TtriCalcium Phosphate 삼인산칼슘 ) 의습식합성으로나노분말및마이크로분말공정을확립하였으며, 기타분말로 MCPM [Mono Calcium Phospohate Monohydrate], DCPA [Dicalcium Phospohate], CaSO 4 2H 2 O [ 석고 ], PolyP[Polyphosphate 과인산 ] 로는상업용원료를사용하여배합하였음. 결과로나노 TCP, 마이크로 TCP 분말각각에대해 PolyP 양및반응시간에따른골시멘트시편의강도변화패턴을조사분석하였음. 시편제작을위해치과및정형외과에서사용하는바울에서원료분말을혼합한후 polyp 수용액을주사기로넣으면서비벼이를금형 ( 직경 14 mm) 에채워넣고하중을올려놓은채로 0 분에서 10분간경화시키고 400 Kg, 1분간일축가압성형한후탈형하여강도를측정하였음. 강도측정기로는만능시험기 [ 대산ENG 멀티 ], 미세조직분석 [FESEM], 나노분말마이크로분말슬러리조직분석 [ 올림프스 X-51 생물역전현미경 x400], XRD 분석등을하였음. P1-G5-2 Characterizations of Bio-ceramic Coatings Fabricated by Aerosol Deposition for Dental Brace Brackets 치아교정브라켓을위해 Aerosol deposition으로제작된바이오세라믹코팅의특성조명연 1*, 김익수 1, 김원중 1, 이동원 2, 오종민 1. 1 광운대학교, 2 한국산업기술시험원 I nterests in bio-ceramics that can restore or enhance body functions has increased to improve the quality of personal life and minimize the economic burden. Moreover, the bio-ceramics are suitable for applications of dental ceramic brackets, and commonly the indentations or recessions which were formed by the bio-ceramics on the brackets can improve mechanical interlocking between bracket and teeth. However, most of conventional processes for making the indentations or recessions required high-temperature heat treatment, which lead to biological performance degradation due to a lot of cracks in the films. On the other hand, the thermal stress and operation cost can be reduced by using aerosol deposition (AD) process, which enable to fabricate dense and crack-free ceramic coatings at room temperature. In this study, we fabricated four types of bio-ceramic coatings on sapphire brackets by the AD process and investigated their 136 한국세라믹학회

147 포스터발표 I deposition characteristics and mechanical properties for application in dental brace bracket. P1-G5-3 Fabrication of Dental High Density Zirconia Sintered Body and Evaluation of Mechanical Properties 치과용고밀도지르코니아소결체제작및기계적특성평가차재민 *, 이정우, 김성혁, 심승언, 오택호, 윤창번. 한국산업기술대학교치과용지르코니아소재의고밀도소결체제조및기계적평가를하였다. 상용의지르코니아를 0.5 ton의압력을가해 10분동안일축가압성형을하고, 2000 bar에서 30분동안냉간등압축성형을하여원형디스크형태의지르코니아그린바디를제조하였다. 지르코니아펠렛을 1450도에서 3시간동안열처리하여고밀도지르코니아소결체를제조하였다. 아르키메데스방법으로밀도를측정한결과 99% 로측정되었다. 기계적물성평가를위해글라인딩및폴리싱공정을진행하여시료표면을가공하였고, 마이크로비커스경도계를사용하여소결체의경도를측정한결과 1527 MPa로측정되었다. 파괴인성을평가하고자이축굽힘강도테스트를한결과굽힙강도가 1366 MPa로측정되었다. 결과적으로소결밀도 99%, 경도 1527 MPa, 굽힘강도 1366 MPa의특성을가지는고밀도지르코니아소결체를제작하였고, 이는치과용재료로서매우적합한특성으로보인다. P1-G5-4 Preparation of Pigment Materials for a Chemical Indicator used in Steam Sterilization 증기멸균확인용인디케이터를위한안료물질의합성김태희 *, 박경봉. 안동대학교 Sterilization is a process designed to remove or destroy all viable forms of microbial life. Various indicators are used to indicate that the sterilization process has worked as planned. Quick-reading indicators that produce color changes only when exposed to moist heat or ethylene oxide plus moisture, as planned, are mostly chemical indicators. The pigment materials separated from imported indicator inks for steam sterilization were identified as PbS 2 O 3. Pigment materials for indicators used in steam sterilization, PbS 2 O 3, were synthesized from the mixed batch solutions with various ratios of lead nitrates and sodium thiosulphates. The particle shapes and lead-sulfur ratios of the synthesized products were investigated. And the influences of ph on the synthesis of PbS 2 O 3 pigment for indicator inks in steam sterilization were investigated. P1-G5-5 Mechanical Properties and in vitro Test of Bioactive Glass Fabrics 직물화한바이오글라스의기계적특성및 in vitro 시험박제원 1*, 나혜인 1, 최성철 2, 김형준 1. 1 한국세라믹기술원, 2 한양대학교 Calcium phosphate ceramics have to have a porous body for bioactivity as well as strong strength for tissue engineering, simultaneously. However, it is a physical contradiction that porous ceramics has the high strength. Bioactive glasses provide superior bone conduction and bioactivity. It can also deliver cells and be biodegradable. In order to overcome the previous contradiction, we suggest bio glass fabrics to weave glass fibers. Glass fabrics have porosity, strength and toughness because it was made by glass fibers. The glass used bioglass 45S5 (45 wt% SiO 2, 24.5 wt% CaO, 24.5 wt% Na 2 O, 6.0 wt% P 2 O 5 ). Young''s modulus, tensile strength, fiber diameter, and fracture deformation of bioglass fabric were measured. In-vitro test was conducted in SBF (Simulated Body Fluid) solution. The density of glass was measured at 1.6 to 2.0 g/cm 3. The tensile strength, Young''s modulus and fracture deformation of the fibers were measured at MPa, GPa and more than 1% respectively. As a results, the glass fibers can bend easily and glass fabrics have porous body. Therefore, bioglass fabrics can overcome the contradiction, which porous ceramics has the high strength for tissue engineering. P1-G5-6 Lamellar Structure of Polymer Infiltrated Ceramic Networks Prepared by Freeze Casting 라멜라구조로고분자함침된세라믹동결주조복합체연구김동규 *, 정욱기, 김도경. KAIST Polymer infiltrated ceramic networks (PICNs) are considered to be the main material of dental prostheses. PICNs are easier to mill and adjust, and have higher damage tolerance because of their approximately 50% lower elastic modulus compared to dental porcelains. PICNs have been actively used for CAD-CAM systems in dentistry that are used exponentially because of high productivity and aesthetic impression. PICNs are based on initial sintering of a ceramic powder to 70~75% of its theoretical density, followed by infiltration with polymer systems. The polymer channels are formed randomly depending on the shape of the pore and change the mechanical properties of the PICNs. Freeze casting is a fabrication method used to make porous ceramics. If slurry used for freeze casting is cooled in one direction, ice crystals grow continuously along the cooling direction, finally provide lamellar pore. Lamellar structure has a high mechanical strength because of the slow crack propagation. In this study, to achieve high mechanical strength, porous yttria-stabilized zirconia was fabricated to have lamellar pore channels by using freeze casting. The optimum condition of polymer infiltration behavior was determined by changing curing temperature and sintering temperature of yttria-stabilized zirconia. The morphology of fabricated PICNs are characterized by using scanning electron microscopy (SEM). The mechanical strength of the composites is measured by using 3-point bending test. P1-G5-7 Development of Immunoaffinity Biosensors based on Microelectrodes 마이크로전극기반면역친화성바이오센서개발이가연 *, 박준희, 송지천, 변재철. 연세대학교 A band-type microelectrode was made using a parylene-n film as a passivation layer. A circular-type, mm-scale electrode with the same diameter as the band-type microelectrode was also made with an electrode area that was 5,000 times larger than the band-type microelectrode. By comparing the amperometric signals of 3,5,3'''''''',5''''''''-tetramethylbenzidine (TMB) samples at different optical density (OD) values, the band-type microelectrode was determined to be 9 times more sensitive than the circular-type electrode. The properties of the circular-type and the band-type electrodes (e.g., the shape of their cyclic voltammograms, the type of diffusion layer used, and the diffusion layer thickness per unit 한국세라믹학회 137

148 2018 년한국세라믹학회춘계연구발표회 electrode area) were characterized according to their electrode area using the COMSOL Multiphysics software. From these simulations, the band-type electrode was estimated to have the conventional microelectrode properties, even when the electrode area was 100 times larger than a conventional circular-type electrode. These results show that both the geometry and the area of an electrode can influence the properties of the electrode. Finally, amperometric analysis based on a band-type electrode was applied to commercial ELISA kits to analyze human hepatitis B surface antigen (hhbsag) and human immunodeficiency virus (HIV) antibodies. P1-G5-8 Development of Capacitive Biosensor based on Vertically Paired Interdigitated Electrode (IDE) 파릴렌과 PEDOT:PSS를이용한적층형캐패시티브바이오센서개발박준희 *, 이가연, 송지천, 변재철. 연세대학교 A capacitive biosensor based on vertically paired interdigitated electrode (IDE) was developed for the non-labeled immunoassay. To improve the sensitivity of capacitive biosensor, this work focused on the fabrication of vertically paired IDE with nano-gap level distance between each electrodes and increase the number of pairs. In this work, vertically paired IDE was fabricated with 3 pairs (6 layered electrode) with a spacing of 500 nm between each electrodes for the detection of target molecules. Vertically paired IDE were fabricated by sequential layering with spin coating of 1) 200 nm PEDOT:PSS as a electrode, deposition of 2) 500 nm parylene thin film as a dielectric layer, 3) repeated 5 times previous steps and 4) patterning mask using photoresist. And then, active electrode area was exposed on the wall of the layered structure by RIE process. The exposed electrodes area were estimated by cyclic voltammetry analysis using potassium ferricyanide as a model redox couple. According to the increase the number of layer from 2, to 6 (1 to 3 pair), the electric charge increased such as 46.4 μc to μc. The measured impedance was analyzed by using an equivalent circuit model which consists of the constant phase element (CPE el ), and a series medium resistance (R s ) with a parallel stray capacitance (C Parylene ). The Property of vertically paired IDE as capacitive biosensor was demonstrated using HRP as a model protein. According to the number of pairs from 1 to 3, the signal change increased nf to nf at 1 Hz. From the analysis by using a model circuit of the vertically paired electrode, and the capacitance was estimated to be dependent on the adsorption of analytes between the electrodes. Finally, The capacitive biosensor based on vertically paired IDE used for the medical detection of influenza A. P1-G5-9 Effect of Solid Loading on the Zirconia Slip-casting and Sintered Properties 고체함량이지르코니아주입성형및소결물성에미치는영향김대성 *, 이종국, 김새열, 김정준. 조선대학교지르코니아임플란트의대부분은성형블록을선반가공한후, 소결하여제작되는데, 선반가공과정에서성형체표면에큰균열을발생되고, 이로인하여소결된임플란트의기계적물성및신뢰성도일부낮아지는것으로알려져있다. 본연구에서는주입성형을통하여지르코니아성형체를제조한후, 소결하는공정을통하여표면결함이최소화된고밀도의지르코니아시편을제작하고자하였 다. 주입성형에사용된슬러리는 3Y-TZP 지르코니아분말, 증류수, 분산제를혼합하여제조하였으며, ph 및첨가되는고체함량과분산제를사용하여슬러리점도를제어하였다. 주입성형에의한고밀도지르코니아소결체제조는고체함량이약 wt% 에서가능하였는데, 고체첨가량및슬러리점도에따라소결체물성이크게변화하였다. 고체첨가량이증가함에따라슬러리점도는 36.4cP 에서 922cP 까지급격히증가하였는데, 슬러리점도가낮으면주입성형시유동성은양호하나성형밀도가낮게나타났고, 고체함량이큰슬러리의경우유동성이낮아완전한형상의성형체제작이어려웠다. 주입성형체를 1500 o C 에서 2 시간소결한결과, 모든시편에서 6.00 g/cm 3 이상인치밀한소결체가얻어졌는데, 그중에서도고체첨가량이 60 wt% 인슬러리로제작한시편이가장높은밀도인 6.07 g/cm 3 를나타내었다. P1-G5-10 Synthesis of Silica Nanorods for Drug Delivery 약물전달용실리카나노로드의제조박성범 1*, Md Shahjahan kabir 2, 박용일 2. 1 동국대학교, 2 금오공과대학교고도의규칙성으로나열된안정한다공성구조, 넓은비표면적, 높은생체적합성및나노크기조절이가능하고기공을갖는다공성실리카나노로드는독특한구조적, 물리 / 화학적특성으로인해다양한약물의전달체로서응용가능성이높다. 기존의다공성나노로드를제조하는공정은나노입자합성에이용되는레이저열분해나원자층증착등을포함하는증기상입자성장, anodizing 등의합성방식이있으나이러한방법의제조공정은생체친화성에문제가있고공정시간, 값비싼공정가격, 조성제어에어려움을가진다. 따라서본연구에서는다양한조성제어가가능한졸-겔공정을통하여공정변수제어 ( 물, 촉매, 용매 ) 를통하여균일한나노기공을구현하고열처리온도에따른생분해성을조절하여, 넓은비표면적과높은기공률을가지는생체적합성실리카나노로드를제조하여특성을분석하였다. 또한, Sodium silica glass 조성을통하여 Na 2 O함량의조절을통해말단그룹을형성시켜 Si-O-Si 결합안정성을감소시켜인체내에용해도를증가시킨실리카나노로드를제조하여특성을비교분석하였다. P1-G5-11 A General Strategy for Depositing Nanoparticles onto Paper Substrates with Exceptional Redispersibility, Stability, and Functionality 종이기판위에나노입자를높은재분산성, 안정성, 기능성이유지될수있도록건조및보관하는일반적인방법조희훈 *. 성균관대학교 When nanoparticles (NPs) are dried on a paper substrate, they generally suffer a serious loss of redispersibility, stability, and functionality. By passivating 13 nm gold nanoparticle (AuNP) surface with stabilizing agents and treating the paper substrate with both bovine serum albumin and sucrose after applying a hydrophobic coating of polyvinyl butyral, it was possible to fully redisperse (~100%) dried AuNPs from the substrate with colloidal stability comparable to that of as-prepared AuNPs. Furthermore, once the AuNPs were physically stabilized with polyvinylpyrrolidone, they could react with thiol-containing compounds such as 1,4-dithiothreitol (DTT), resulting in a AuNP-aggregation-induced color change from red to blue. Taking advantage of the oxidatio of hypochlorous acid with DTT, it was possible to demonstrate paper-based colorimetric sensor for detection of residual chlorine in water with a tunable 138 한국세라믹학회

149 포스터발표 I dynamic range. Since this strategy is applicable to large sized AuNPs (30-90 nm), silver nanoparticles, oleic acid-capped magnetic NPs, and cetrimonium bromide-passivated gold nanorods, it can be used as a general platform for diverse NPs requiring long-term storage in their applications. P1-G5-12 Aesthetic Coloring of Ni-Ti by Oxidation Treatment for Orthodontic Wires 치열교정용와이어인니켈-티타늄의산화처리를통한심미적인색상특성평가배재섭 *, 김석영. 영남대학교 The color of orthodontic wire is one of the most aesthetic factors to be considered in current dental treatment. A shape memory alloy (Ni-Ti wires) is widely used for the tooth correction in dentistry due to its shape memory effect. However, the color of the NiTi is one the most obstacle for wide application. For the coloring of NiTi alloys, various studies such as anodizing, surface coating, etc., were tried. However, several problems were occurred such as the mechanical strength lowering due to high temperature treatment of NiTi, the color change due to the corrosion as the time passes. In this study, the aesthetic color of NiTi was obtained by the oxidation at the relatively low temperature. The oxidation carried out in the temperature range between 300 to 500 o C. The color of NiTi obtained at various temperatures and conditions was measured using colorimetry and evaluated in terms of the fraction of oxide phases. P1-G5-13 Improvement of Surface Roughness by Room Temperature Spray Coating on Zirconia Substrate 상온분사코팅을이용한지르코니아기판의표면조도향상김형진 *, 이종국. 조선대학교지르코니아는고강도, 내마모성등우수한기계적물성과, 내부식성, 무독성등생체친화적성질을가지고있다. 또한높은굴절률및투광성으로인하여광학적으로우수한심미성도가지고있어치과용임플란트소재로각광을받고있다. 그러나기계가공및소결공정으로제작된치과용임플란트의경우표면이평활하여세포의부착성이떨어지고, 이로인하여골결합이약하게형성되는것으로알려져있다. 본연구에서는평활한지르코니아표면의단점을보완하기위하여, 상온분사공정을이용, 지르코니아기판위에지르코니아분말을코팅시켜표면거칠기를증가시키고자하였다. 출발원료분말의크기에따른코팅층의물성을비교하였으며, 코팅횟수를반복하여코팅층의두께에따른표면조도의변화를분석하였다. XRD와 SEM을이용하여코팅층의상분석및미세구조를관찰하였으며, AFM을이용하여표면형상을관찰하였다. P1-G5-14 Comparative Study on the Characteristics of OCP Synthesized with Various Calcium Salts 다양한칼슘염으로합성된 OCP의특성에대한비교연구허지안 *, 김석영. 영남대학교 Calcium phosphate materials (CaPs) are similar to inorganic part of human mineralized tissues (i.e., bone, enamel, and dentin). Due to their high biocompatibility, various CaPs, mainly hydroxyapatite (HA), have been investigated for their use in various medical applications. In the recent studies, non-apatitic CaPs such as octacalcium phosphate (OCP, Ca 8 H 2 (PO 4 ) 6 5H 2 O) get attention due to its fast bone regeneration with biodegradable property. This study was focused on the effects of various calcium salts in the synthesis of OCP. The calcium acetate, nitrate and chloride solutions were mixed by dropwise addition into phosphate solution at constant temperature (70, 80 C) for 30 minutes on hotplate in the range of ph (5.0~5.5) respectively. The purity and morphology of the synthesized OCPs were investigated in terms of Ca-source and process temperature. The highest purity of OCP was obtained in the calcium acetate added solution (about 99.6%) but the lowest purity in the calcium chloride added solution. In OCP morphology was changed with the Ca-source; calcium chloride showed the largest change with processing temperatures (70 C). P1-G5-15 Preparation of Calcium Phosphate (BCP) via Wet Chemical Preparation from the Different Ca/P Precursor Ratios 이병우 *, 홍일곡. 한국해양대학교 Calcium phosphates, pure hydroxyapatite (HAp), β-tricalcium phosphate (TCP) and biphasic HA/β-TCP, were synthesized by a wet precipitation method. The calcium phosphates were synthesized using Ca(OH) 2 and H 3 PO 4 aqueous solutions. The effects of the initial precursor Ca/P ratios, 1.4, 1.5 and 1.67, and the calcination temperatures on the phase evolution of the powders were investigated. The phase of resulting powder was controllable by adjusting the initial Ca/P ratio. HA was the only phase for as-prepared powders regardless of Ca/P ratios. The single HA phase was obtained for the initial Ca/P ratio of 1.67 throughout the entire heat-treatment temperatures ranging from 500 C to 900 C. For the powder synthesized from the initial Ca/P ratio of 1.4 and 1.5, the β-tcp phase has appeared in the pre-existing HA phase, after heat treated above 700 C. β-tcp and biphasic HA/β-TCP were synthesized at 900 C from the initial precursor Ca/P ratios, 1.4 and 1.5, respectively. P1-G5-16 Development of Dental Glaze Enhanced Esthetics and Bonding Strength 결합력과심미성을증진시킨치과용 glaze 개발손시원 *, 김준형, 김예나, 김성민, 임형봉. ( 주 ) 하스현재치과보철소재시장에서는심미성과구강내에서의보존이중요한요소로자리잡고있다. 보철물의심미성을높이는치과용소재는매우다양하며, 그중치과용 glaze는보철물의표면에광택을내는소재로서, 자연치와유사한광택을부여하여심미성을높이고, 보철물의강도를증진시키는역할을한다. 하지만, 현시장에서사용되는세라믹 glaze는보철물과물리적으로결합하여낮은결합력을보일뿐만아니라, 구강내에서대합치및인접치와의마모와같은문제점이발생하고있다. 이연구에서는보철물재료중하나인지르코니아와의화학적결합을유도하여결합력과심미성을증진시킨 glaze를개발하고자실제임삼적관점에서의평가및지르코니아와 glaze간의화학적결합을확인하였다. P1-G5-17 Development of Adhesives Liner to Improve Bonding Strength between Dental Zirconia and Porcelain Veneer 치과용지르코니아와도재의결합강도를증진시키기위한이장재개발김예나 *, 임형봉, 김준형, 김성민, 손시원. ( 주 ) 하스최근치과보철소재시장에서는미적욕구의증대로전치부뿐만아닌, 구치부에서도높은심미성을요구하고있다. 따라서심미성과동시에높은기계적특성을만족할수있는소재의개발이필요 한국세라믹학회 139

150 2018 년한국세라믹학회춘계연구발표회 하게되었다. 완전도재수복물은금속수복물에비해자연치와유사한심미성과생체안정성을가지고있다. 완전도재수복물중지르코니아전부도재관의경우 1200 MPa 정도의높은기계적강도와화학적내구성, 내마모성을가지고있으나, 화학적으로불활성하며, 심미적특성중투광성은다소떨어지는단점이있다. 이러한심미성을보완하기위해투광성이높은세라믹도재를지르코니아위에가압주조한결정화유리수복물이제작되고있다. 하지만, 지르코니아와세라믹도재간에열팽창계수차이와낮은젖음성으로도재층이벗겨지거나균열이생기는등의임상적용실패가빈번히발생되는실정이다. 본연구에서는지르코니아와세라믹도재간에강한결합력을위해화학적결합을유도하는세라믹결합제를개발하고자한다. 또한열접합에따른지르코니아와세라믹결합제간전단결합강도를측정하고미세구조및성분분석을통해화학적결합메커니즘을규명하고자한다. P1-G5-18 Particle Size Control of Vermiculite for Master Batch Application 마스터배치적용을위한버미큘라이트의입도제어조선복 1*, 장정호 2, 황해진 1. 1 인하대학교, 2 한국세라믹기술원본연구에서는마스터배치에세라믹재료버미큘라이트의적용을위한입도제어를목표로하였다. 마스터배치는기본플라스틱원료와첨가제를고농도로농축하여분산시켜놓은펠렛모양의원료이다. 첨가제로써버미큘라이트를사용하였으며버미큘라이트는열을가하면팽창하는성질과불연성이며다공질로서널리이용되고있다. 마스터배치에첨가제를적용시키려면첨가제의균일한분포와크기가필요하다. 세라믹재료의경우입자의분포가다르게되면뭉침현상이생기게되고물품을만들시불량품을만들게된다. 입도를제어하기위한방법에는젯밀, 볼밀, 비드밀등이있으며최종적인미분을만들때많이사용되는볼밀링을하였다. 볼밀링은 10 mm직경의질코니아볼과질코니아자를사용하였고조건으로는시간과볼의무게 ( 사용량 ) 에초점을두었다. 총 6~24시간밀링을하였으며 11~16 µm의입경사이즈를얻을수있었다. SEM분석과 PSA분석을통하여입도분포와크기를확인하였다. P1-G5-19 Effects of Water Contents on Ball-mill Pretreatment and Enzymatic Digestibility of Corn Stover 구양모 *, 이진형. 한국세라믹기술원 Lignocellulosic biomass pretreatment impacts saccharification and subsequent biological conversion to biofuels. The effects of four quantity of water inputs, 0, 25, 100, and 400%(w/w) on ball mill pretreatment of corn stover and enzymatic hydrolysis were studied under two milling temperature and three milling times (temperature of 80 and 100 C, milling time of 10, 20, and 30 min). The ball mill pretreatment caused reduced corn stover particle production and disruption of a rigid cell wall matrix. Changes of corn stover were analyzed by using size distribution and mean diameter depending on milling temperature and time. Milling with 0%(w/w) water input quickly grind corn stover. After 30 min of milling, the milling with 400%(w/w) water input produced smaller size of corn stover than other water input conditions. At 80 o C milling temperature, the water input of 0 and 400% led the production of smaller size corn stover than the samples milled at 100 o C. The highest glucose yield was obtained from the sample milled at 80 o C for 30 min with no water input; 67.0% of glucose yield. The effect of milling time on glucose yield was investigated depending on water input. The corn stovers milled with 0 or 25%(w/w) water input showed higher glucose yield when milled at 80 o C while, for the samples milled with 100 or 400%(w/w), higher glucose yield was obtained when milled at 100 o C. Finally, several ball mill conditions were proposed to construct a combinational pretreatment process based upon the results obtained in this study. P1-G5-20 Preparation and Characterization of Polymerinfiltrated Leucite Ceramics for Dental Restorations 치아수복용루사이트 / 고분자복합체제조및특성평가이득용 1*, 신지연 1, 노정원 1, 이성은 1, 김배연 2. 1 대림대학교, 2 인천대학교 Polymer-infiltrated leucite ceramics (PILs) were prepared by monomer infiltration into porous leucite preforms and subsequent polymerization by varying the silane concentration in the range of 1% to 20% to investigate the effect of silane concentration on mechanical properties of the PILs. The optimized hardness, the strength and the fracture toughness of 99.5 Hv, 271±10 MPa and 3.74±0.11 MPa m 1/2 were observed for the PILs having a silane concentration of 14%. However, they started to decrease when the silane content was raised more than 15%. The fracture mode was changed from intergranular to transgranular fracture across the ceramic particles with increasing the silane content. Most of the crack energy were dissipated by passing through the ceramic particles rather than through the polymer. The PILs exhibited no evidence of causing cell lysis or toxicity regardless of silane concentration, implying that the PILs are clinically suitable for use as dental restorations. P1-G5-21 Effect of the Preparation of Granules and Pastes on the Injection Behavior of Brushite Bone Cement 과립및페이스트제작조건이 Brushite Bone Cement의주사배출특성에끼치는영향오경식 *, 조현호. 안동대학교인산칼슘계시멘트는 Kypoplasty와같은치료과정에서주사장치를통해환부에적용된다. 이때본시멘트는페이스트상태에서가느다란관을통해배출되어야하며우수한주사성 (Injectability) 을가져야한다. 본연구에서는 400 MPa에서 10 ml/min의속도로 12 초만에주사기에서배출하면서탑재된양대비배출된양을측정하여주사성을평가하였다. 주사성은 Brushite시멘트의출발물질중 β-tcp의상태에따라크게변화하였는데본연구에서는선행연구를통해드러난두가지중요변수를최적화하여주사성을평가하였다. 우선 1150도에서열처리한 β-ca 3 (PO 4 ) 2 과립을전체 β- Ca 3 (PO 4 ) 2 중에서 70% 함유하도록하였으며아울러페이스트제작중 Ca(HPO 4 ) 2 H 2 O와 CaSO 4 1/2H 2 O를먼저경화액에혼합하여주사율의변화를평가하였다. 이렇게제작된경화체의밀도과기공율을평가하고상분석을통하여새로운제작조건이시멘트활용에미치는영향을분석하였다. P1-G5-22 Synthesis and Characterization of Iron Substituted Beta-tricalcium Phospahte Fe 이온치환인산칼슘포스페이트의합성및특성평가유경현 *, 김용준, 김현진, 장영근, 윤석영. 부산대학교 The aim of this study was synthesis Fe ions substituted β-tcp and invesigate the effects of Fe ions on the physical and chemical properties. Enhancing the osteoconduction properties is important for temporary medical device. Some studies synthesized iron doped β- 140 한국세라믹학회

151 포스터발표 I TCP due to its cell affinity property. However, the mechanism of synthesis Fe-substituted β-tcp is not yet clearly known in structural analysis. In this study, The Fe ions substituted β-tcp powder were synthesized by co-precipitation method with different contents. Crystal structure and thermal properties of Fe- substituted β-tcp were investigated by using X-ray diffraction combined with rietveld refinement analysis and differential thermal analysis (DSC) to compare the effects of substituted elements on β-tcp. P1-G5-23 Synthesis and Biocompatibility of Synthetic Bond Graft for Dental Restorations 치아수복물용합성골이식재의제조및셍체적합성신지연 *, 김도연, 이득용. 대림대학교 Biphasic calcium phosphate (BCP) bone grafts were successfully synthesized using the 45 ppi polyurethane sponge coating method. XRD results revealed that the BCP scaffolds were mainly composed of hydroxyapatite and β-tricalcium phosphate (β-tcp). As the number of BCP coatings increased from 1 to 5, the pore size and the wall size decreased from 480 ± 93 μm to 306 ± 120 μm and increased from 104 ± 25 μm to 186 ± 40 μm, respectively. The BCP scaffolds coated once, twice, three times, four times and five times, exhibited average cell viability of 106%, 109%, 114%, 107%, and 93%. The BCP scaffolds showed no evidence of causing cell lysis or toxicity. In addition, the cell proliferation results suggested that L-929 cells adhered well to the BCP scaffolds and proliferated continuously with increasing time, indicating that the BCP powders are highly applicable to the synthetic bone grafts. P1-G6-1 Analysis of Working Group Activities of ISO/TC 160, 163 국제표준화기구 (ISO) 건물용유리 (TC160), 건축물환경에서의열성능및에너지사용분야 (TC163) 활동분석이양수 1*, 권순동 2, 이승률 2. 1 성균관대학교, 2 기계융복합기술연구조합 21세기들어와서전산업에서에너지절감이빅트렌드중의하나로부각됨에따라, 기능성유리에대한산업시장은성장중에있다. 이러한기능성유리는외부에서유입되는태양광의투과율을임의로조절하여실내의온도상승을억제하거나상승시켜서냉방이나난방에사용되는에너지손실을줄이거나에너지효율을향상시켜사용자에게쾌적한환경을제공하는기능을제공하는윈도우를지칭한다. 기능성유리는새로의소재의개발과새로운양산방식에따른품질평가방식이발생하게되고, 이러한부분의신뢰성을확보하는방법의핵심요소가각분야에대한표준화이다. 따라서각국은자국의표준뿐만아니라국제협력을통한국제표준절차제정에많은노력을기울이고있다. 국제표준화기구의기술위원회인 ISO TC 160( 건물용유리 ) 산하에는 SC1은 Product considerations 이며, SC2는 Use considerations" 에관련된표준을추진하고있으며, TC163( 건축물환경에서의열성능및에너지사용분야 ) 산하에는 SC1은 Test and measurement methods 이며, SC2는 Calculation methods" SC3는 Thermal insulation products 관한표준을추진중에있다. 본발표에서는위 TC에대한국제표준화현황을소개함으로써기능성유리관련표준활동분석및향후방향성을제시하고자한다. P1-G6-2 A Study on the Correlation of Physical Properties According to ta-c Coating Layer Thickness ta-c 코팅층두께에따른물성들의상관관계에대한연구김효준 1*, 최다현 1, 이희신 2, 장규범 2, 이선영 1. 1 한양대학교, 2 ( 주 ) 네오티스드릴비트를이용한절삭공정시, 자르는물질과접촉이일어나면서연속적마모가일어나며, 마이크로크기의비트수명은급격히줄어들게된다. 이와같이마이크로드릴비트의내마모성을향상시키기위하여 Diamond like carbon (DLC) 코팅을도입하고자한다. DLC는 amorphous한 carbon의한종류로다이아몬드의특정한특성을가지는물질로써코팅하면비트의표면의경도를향상시켜마모에대한저항이줄어든다. 이런우수한특성을가지는 DLC코팅의종류중에서도 ta-c (tetrahedral amorphous carbon) 는수소를포함하지않는비정질탄소계경질박막으로, 탄소원자의 amorphous구조에서는수소없이치밀한막으로경도가높은장점이있다. 또한, 박막을구성하는 sp3 결합의비율은 40% ~ 80% 의범위내에서조절이가능하기때문에경도정도를설계할수있다. 따라서본연구에서는마이크로비트에 ta-c 코팅의두께를조절함으로써경도, 박리, 코팅의밀착력정도에따른비트의품질에영향을미치는요소들과의상관관계를파악하는연구를진행하고자한다. SEM분석을통하여비트에코팅된두께를측정하고, 스크래치테스트를통해서박리가일어나는물리적수치를구할수있다. 이와같이두께에따른물성의상관관계를비교함으로써코팅에대한두께최적화를진행하고자한다. 따라서최적조건의 ta-c 코팅두께가적용된비트에대하여접촉마찰력을낮춤으로써마모에대한저항이줄어들어비트의가공품질, 가공수명이향상된효과를볼수있을것으로판단된다. P1-G6-3 Study on Luminscent Properties of Phosphor-in-glass (PiG) for Various Phosphor Contents 형광체함량에따른형광체담지유리의형광특성변화연구이우철 *, 류지승, 정홍채, 양현경. 부경대학교 Since light emitting diodes (LEDs) have been widely investigated, high power LEDs and laser diodes (LD) based light source become a next generation light source in illumination and display applications. A commercial method to generate white emission is combination of GaN LED emitting blue and yellow phosphor (YAG:Ce 3+ ). The yellow phosphor coated on a blue LED as a shape of film or encapsulation that consists of phosphor and epoxy. However, epoxy is not applicable to high power LED and LD due to thermal degradation of epoxy. From this reason, the Phosphor in Glass (PIGs), kind of remote phosphor, has been reported due to their thermal stability. In this study, we fabricated the the PiGs using glass-fusing technique with domestic microwave oven. The PiG consist of a common soda-lime glasses and YAG:Ce phosphor was fabricated. In order to characterize the effect of (1) microwave radiation energy and (2) weight ratio between glass and yellow phosphor, microscopic observation, luminescent property and thermal stability are discussed. P1-G6-4 The Study of Dy 2 O 3 doped Glass System for Laser Sealing of Dye-Sensitized Solar Cell Module 김소영 1*, 최주현 1, 박준 1, 김선훈 1, 김진혁 2. 1 한국광기술원, 2 전남대학교 Dye-Sensitized Solar Cell (DSSC) module have been actively studied because of low cost and transparent. In fact, DSSC module had lower 한국세라믹학회 141

152 2018 년한국세라믹학회춘계연구발표회 efficiency than that of a silicon solar cell and had a problem of electrolyte leakage. Recently Dye-Sensitized Solar Cell (DSSC) has become interested again as the novel perovskite materials were applied to DSSC module to improve the efficiency. Laser sealing in local areas of sealing methods has been intensively studied to improve the reliability of DSSC module. However, glass frit material, which is to be transparent and has good absorption efficiency in the infrared region for laser sealing, has been not diversely developed. Therefore, we developed Dy 2 O 3 doped glass materials and evaluated the optical, thermal, and thermo-mechanical properties. It was observed that Dy 2 O 3 doped glass materials showed the transparence of above 77.5%. They had absorption peaks around 800 nm and 900 nm, which became deeper with increase of the concentration of Dy 2 O 3. The glass transition temperature and coefficient of thermal expansion were not mainly affected because of the concentration of Dy 2 O 3. Considering those results obtained above, Dy 2 O 3 doped glass systems shows the potential candidate for laser sealing material in order to improve the reliability of Dye-Sensitized Solar Cell (DSSC) module. P1-G6-5 Plasma Resistance of CaO-Al 2 O 3 -SiO 2 (CAS) glass under Fluorocarbon Plasma with Ar + Fluorocarbon와 Ar + 가스플라즈마에대한 CaO-Al 2 O 3 -SiO 2 (CAS) 유리의내플라즈마성나혜인 1*, 박제원 1, 최성철 2, 김형준 1. 1 한국세라믹기술원, 2 한양대학교 The plasma resistant glass is a new material which could be applied for dry etcher in semiconductor fabrication. In dry etcher, fluorocarbon and Ar gases plasma are used for developing a pattern of semiconductor, so high plasma resistant material, as Y2O3, has been required for etcher. Recently, CaO-Al 2 O 3 -SiO 2 (CAS) glasses also were known to be high plasma resistant and low cost. However, there is no research to optimize their compositions. In order to optimize the CAS glass composition, Design of Experiment (DOE) was used with CaO 14~48, Al 2 O 3 4.6~16, SiO ~70 (mol%). The optimal composition of CAS glasses was obtained by Mixture Design of Minitab simulation. All of glasses were melted at 1600 o C and thermal property such as CTE,, and half sphere temperature were measured through TMA and High temp microscope. The plasma resistant properties of CaO- Al 2 O 3 -SiO 2 glasses were estimated by dry etcher with mixed CF 4 /O 2 / Ar gases. All CAS glasses etch rates were below 25 nm/min, which are lower than that of sintered alumina and sapphire. CAS glasses showed an improvement in the etch rate, which is 73% better than of sapphire. The optimized composition of CAS glasses is CaO 26.2, Al 2 O 3 14, SiO (mol%). P1-G6-6 Compositional Change of Cd-S-Se Quantum Dot Embedded Glasses for Multi-Color Emission and Fabrication of White LED 다중파장발광을위한 Cd-S-Se 양자점함유유리의조성제어및백색 LED 제조한가람 1*, 허종 2, 정운진 1. 1 공주대학교, 2 포항공과대학교양자점은이론적으로 100% 에이르는우수한색변환효율과양자점크기조절을통해다양한흡수및발광파장의구현이가능하기때문에차세대광학소재로서각광받아왔다. 더욱이엑시톤천이에의하여발광선폭이작아우수한색순도를가진다는장점으로인해고성능디스플레이또는조명에적용및개발이진행되고있다. 그러나, 대부분의양자점은습식 - 화학공정을통해콜로이달형태로제조되어열적및화학적안정성이취약하고, 장기내구성이부족한단점이있다. 이러한문제를해결하기위해, 본연구진에서는, 열처리를통하여유리내에 Cd-S-Se 양자점을형성하여우수한열적안정성및색변환특성을가지는양자점함유유리 (QDEG) 를제조하고이를이용하여실제백색 LED 를구현하여보고한바있다. 그러나, 유리내일정한분포의양자점크기로인해발광선폭이비교적넓고, 단일의최대발광세기파장을가져비교적좁은색재현성범위를갖는다는한계가있다. 본연구에서는, 유리내의 Cd 와 ZnS 와같은출발물질의조성제어를통해양자점의형성을제어하여동일열처리조건에서녹색또는적색파장등발광파장의조절이가능한양자점함유유리소재를제조하였다. 다중파장의발광이가능한 QDEG 소재제조를위해각각발광파장이다른유리소재를접합하여백색 LED 구현을시도하였다. 양자점함유유리소재는통상적인용융냉각법을이용하여제조되었으며, 동일한조건의열처리후흡수및발광스펙트럼을통해양자점의변화를확인하였고, XRD 및 Raman 분광분석을이용하여미세구조를확인하였다. 적분구를이용하여접합된양자점함유유리소재의색변환효율, 색좌표, 연색지수등을확인하였다. P1-G6-7 Photoluminescence of Silicate Glass doped with CuO, In 2 O 3 and ZnS under UV-illumination UV 여기광에의한 CuO, In 2 O 3 및 ZnS가첨가된규산염유리의발광특성박경대 *, 한가람, 정운진. 공주대학교양자점 (QD) 은 exciton Bohr 반경보다작은반도체나노입자로서, 이론적으로 100% 에이르는높은양자효율을가질수있으며, 크기에따라쉽게색을바꿀수있는장점이있다. 이에따라 CdS 및 CdSe와같은 Cd 기반 QD가가시광영역에서의발광특성과높은효율로인해많은연구가수행되었으며, 특히청색광을녹색또는적색발광으로변환시키는 LED 및디스플레이분야에활발하게응용되어왔다. 그러나최근 RoHS 규제로인해 Cd가함유되지않은 QD가연구되어상용화되었으며, 특히 ZnS, InP 또는 CuInS 2 등을기반으로한 QD가폭넓게연구되었다. 그러나, 대부분의 QD는피복층을필요로하며, 습식화학을통해제조되어화학적및열적안정성이취약하다. 이러한단점을해결하기위해 QD가함유된유리 (QD - embedded glass, QDEG) 소재가연구되어성공적으로백색 LED를구현한바있다. 그러나, 현재까지유리내에 Cd- 또는 Pb-가없는 QD에대한연구는미비한실정이다. 따라서, 본연구에서는 CuO, In 2 O 3 및 ZnS 를포함하는규산염유리를제조하여유리내에 Cd-free QD의생성을시도하였다. 유리의색은첨가제의함량및열처리조건에따라변화하였으며 UV lamp 로여기시, 가시광선의발광을확인할수있었다. UV/VIS 흡수및 Photoluminescence (PL) 과같은광학특성을분석하였으며, XRD 및 TEM 을통해유리내에서의 QD 형성여부를확인하였다. 142 한국세라믹학회

153 포스터발표 I P1-G6-8 Effect of Compositional Variation of Silicate Glass on its Refractive Index and Hardness for Glass Beads with Midrange Refractive Index 중굴절유리알용규산염계유리소재의조성변화가굴절률및경도에미치는영향김인건 *, 이한솔, 정운진. 공주대학교현재국내도로표지용유리알소재의경우굴절률이 1.5 수준의저굴절유리소재를사용하여야간및우천시, 낮은재귀반사성능으로인한교통사고위험이크다는사회적문제가제기되어왔다. 유리알재귀반사성능의증가를통해이를개선하기위해최근도로표지용유리알의굴절률규격이굴절률 (n d ) 1.64 ~ 1.8 수준의중굴절유리소재로상향되었으나, 현재대부분도로표지용유리소재에관한기술및제품을해외에의존하고있는실정이다. 본연구에서는중굴절유리알제조를위해, SiO 2 -TiO 2 -BaO-ZnO- Na 2 O 계유리를조사하였으며, 첨가조성에따른굴절률및경도변화를분석하였다. 제조된유리는 abbe refractometer에서표준파장 589 nm를사용하여굴절률을측정하였으며, micro-vickers 경도계를통해경도를측정하여실제노면에적용가능한유리조성을확보하였다. 확보된유리시편의결과를분석한결과, 규산염계유리내에첨가된산화물조성에따라측정된굴절률의값이선형적으로변화하는것을확인하였다. 따라서, 조성변화에따른굴절률과경도의최적화및예측을위해, 이의결과를가공하여조성과굴절률또는경도의상관관계에대한수식을선형대수학적모사를통해유도할수있었다. P1-G6-9 Reserch on Metal-oxide-KNO 3 Slurry for Ion-exchange Strengthend Glass through Spray Process 스프레이공법을이용한화학강화유리제조에필요한 Metal- Oxide-KNO3 - 슬러리제조권민형 *, 임현태, 김선욱, 김진호, 황종희. 한국세라믹기술원일반적으로얇은박판유리를강화하는방법은화학적강화방법을이용한다. 화학적강화를위해박판유리를알칼리이온이담겨진용융조속에 dipping하는방식이있다. 이방식은알칼리이온농도가희석되어공정상의불량을초래할가능성이있다. 이러한단점을보완하기위해최근스프레이공법을이용한연구가늘어나는추세이다. 스프레이공법을이용할경우이온교환에의한슬러리농도감소효과가적고생산시간을단축할수있어양산성을증가하는장점을갖고있다. 따라서본연구에서는스프레이공법에적합한 Metal-Oxide-KNO 3 -슬러리의조성제조및특성평가를진행하였다. 유리섬유, ZnO, Al 2 O 3, SiO 2, Aerogel 슬러리를각각 KNO 3 용액과배합하여유리기판위에 2 g씩도포한후 400 o C에서 90분씩동일한공정조건에서이온강화를실시하였다. 그결과 Al 2 O 3 -KNO 3 슬러리의특성이가장우수하였으며, 표면압축응력 (CS) 이 900 MPa, 강화깊이 (DOL) 는 18 μm이었다. 이는기존스프레이공법을이용한상용제품의특성 (CS: 700 MPa, DOL: 25 μm) 과비교하여유사한수준이다. P1-G6-10 Effect of Phosphoric Acid Amount on Crystallization Phase of Calcium Phosphate Glass Prepared from Eggshell 인산의양이란각으로제조된인산칼슘유리의결정상에미치는영향강태성 *, 이상진. 국립목포대학교순수한 P 2 O 5 는 PO 4 의 3차원적인사면체구조를형성하고있으며, 순수한상태에서극히불안정하여수분이접촉하게되면급격하게반응하여 H 3 PO 4 로변한다. 하지만망목수식산화물의첨가에의하 여이러한사면체구조가깨어지고유리와같은불규칙한원자구조를지니게된다. 인산염유리는자외선에대한광학적성질이뛰어나고낮은용융점, 체액에서의쉽게용해되는특성으로인하여광학기기및봉지재, 의료소재, 복합재료의강화재로사용되고있다. 본연구에서는생활폐기물로서버려지는란각 (eggshell) 을활용하여인산칼슘유리를제조하고, 첨가된인산의양이결정상에미치는영향을고찰하였다. 폐란각을초산 (acetic acid) 에용해시킨뒤, 필터링하여난막및기타부유물을제거하였다. 제조된용액에목적하는 P 2 O 5 비율에맞추어인산을첨가하여혼합용액을제조한후이를건조하여전구체를준비하고, 용융공정을거쳐인산칼슘유리를제조하였다. 500 C 미만에서란각에포함된단백질성분과 CO 성분의분해가일어났다 C 에서용융후 15 C 로급냉하여유리상을제조하였다. 제조된유리시편의전이점, 연화점및열팽창계수는 TG/DSC 를이용하여측정하였다. 별다른결정화제를첨가하지않아도낮은온도에서유리의결정화가진행되었다. 이러한결정화된유리의결정상은결정화온도및유지시간에따라변화되었으며, 그변화를 XRD 분석을통하여고찰하고, 생성된상을조절하여바이오재료로서의사용여부를검토하였다. P1-G6-11 Standardization of Chemical Resistance Measurement Methods for vitreous and porcelain enamel 유리및자기법랑에관한내화학성측정방법의표준화박현욱 *, 임태영, 이영진, 김진호, 전대우, 김선욱, 이미재. 한국세라믹기술원법랑은금속표면에산, 알칼리, 약품등의부식을방지하기위해특수유리분말을고온으로피복시켜금속의강인성에유리의내식성과청결성을겸비하도록만들어진방법으로화학, 제약공정의반응기기, 염수탱크및배관제등에널리사용되고있다. 국내수요기업들에요구되는특성을만족하는법랑제품은프랑스, 일본등일부선진국에국한되어독점적시장을구축하고있으며, 국산화를위한개발을진행중에있으나개발제품의내식성평가규격및기관이전무한현실이어서제품의품질을수치화하기위해많은비용과시간을필요하다. 본연구에서는이러한법랑질의주성분인 SiO 2 등이구성하는 3차원이산화규소망조직이침투성매질에의해가수분해되어질량감소를나타내기때문에법랑질을일정시간산과알칼리등에노출시켜전후의질량변화를 0.1 mg 단위로측정하여연간부식율을계산하는표준평가방법을설계하고일정시간균일한양의증기및용액을노출시킬수있는장비를제작하여국내의법랑제품개발및수요기업들의표준화된평가방법을제시할수있게하였다. 설계된평가방법에의해 20% HCl 증기에서 0.14 mm/year을나타내는표준샘플에대한법랑유리를평가한결과연간부식율은평균 mm, 표준편차 을가졌고, 1 M NaOH 용액에서 0.35 mm/year를나타내는표준샘플에대한법랑유리를평가한결과연간부식율은평균 mm와표준편차 를나타내었다. P1-G6-12 Study on Optical Properties and Structure of Mg(PO 3 ) 2 /Al(PO 3 ) 3 Containing Fluorophosphate Glasses Mg(PO 3 ) 2 /Al(PO 3 ) 3 를포함하는불소인산염유리의구조및광학적특성연구박찬휘 1*, 박상호 1, 윤인상 1, 최주현 2, 신동욱 1. 1 한양대학교, 2 한국광기술원기존 LIDAR 광원으로 1064 nm Nd:YAG 레이저및레이저다이오드가사용되어왔으나시각장애, 고가의장비와운영비, 부피가크다는단점들을가지고있다. 이러한문제로인하여최근경량이면 한국세라믹학회 143

154 2018 년한국세라믹학회춘계연구발표회 서시각에영향을미치지않는장파장대역의 1550 nm 광섬유레이저광원에대한연구가진행중에있다 nm 발진파장을안정적으로획득할수있는유리로는 Fluorophosphate Glass 가최적의후보로서많이연구되고있다. 본연구는 Fluorophosphate Glass 최적조성의탐색을위하여 Al(PO 3 ) 3, Mg(PO 3 ) 2 를기반으로제조된삼성분계 Fluorophosphate Glass 를제작하여중거리구조및광학특성을분석하였다. amg(po 3 ) 2 -bbaf 2 -ccaf 2 /aal(po 3 ) 3 -bbaf 2 -csrf 2 (a+b+c = 1) 의조성으로유리를제작하였으며, 제조된유리를가공하여광학적특성을분석하였다. 각유리시편들은굴절률을측정하여광학적특성을분석하였으며, 라만분광분석을통해각유리샘플들의조성변화에의한구조변화를관찰한결과유리내부의 meta-phosphate 구조의증감에따라굴절률의변화가나타나는것이확인되었다. 반면불소계 (BaF 2, CaF 2 ) 조성의변화는유리구조에적은영향을끼침을확인할수있었다. This Dual Use Technology Program was supported by Defense Acquisition Program Administration and the Ministry of Trade, Industry and Energy (14-CM-MP-01), South Korea. P1-G6-13 Amorphous CaCu 3 Ti 4 O 12 Thin Films on a Flexible Polymer Substrate 유연폴리머기판상증착된비정질 CCTO 박막한찬수 *, 최홍제, 오효찬, 조용수. 연세대학교 High dielectric constant thin films processable at nearly room temperature have been demanded for various flexible electronic devices. Here, we explore the origin of abnormal dielectric behavior of amorphous CaCu 3 Ti 4 O 12 (CCTO) thin films having an exceptionally high dielectric constant, in conjunction with chemical states and unusual ferroelectricity in amorphous state. As an optimal example, the amorphous CCTO film sputtered at room temperature under an oxygen partial pressure of 3.6 mtorr exhibits a dielectric constant of ~192 and a dielectric loss of < 0.1 at 100 Hz. The promising dielectric characteristics are unexpectedly found to originate from the evolution of ferroelectric domains, even in the amorphous state. Strong dependence of oxygen partial pressure on chemical states, vacancy formation and ferroelectric polarization is very critical for the unexpected dielectric behavior. This may be the very first example of exploring the origin of amorphous dielectric behavior for a material that possesses space charge polarization. P1-G6-14 Chemical Effects of Organo-silanized SiO 2 Nanofillers on Epoxy Adhesives 에폭시계접착제에서기능화된실리카나노필러의화학적영향이진웅 *. 성균관대학교 Although thermal and mechanical effects of organo-silanized SiO 2 nanofillers (NFs) incorporated into epoxy resins have been actively studied by many researchers, their chemical properties have rarely been reported. In this work, we investigated the chemical effects of organo-silanized SiO 2 NFs on epoxy adhesives with (3-glycidoxypropyl) methyldiethoxysilane (GPTMS) and (3-aminopropyl) trimethoxysilane (APTMS)-functionalized SiO 2 NFs. After curing epoxy-functionalized NF (EPOXY-NF) with triethylenetetramine (TETA) hardener, we were able to verify chemical crosslinking of the TETA hardener on EPOXY-NF with X-ray photoelectron spectroscopy, vacuum Fourier-transform infrared spectroscopy, and zeta potential analysis. Similarly, we found that after curing amine-functionalized NF (NH 2 -NF) with bisphenol A diglycidyl ether (DGEBA) epoxy resin, the resin was chemically crosslinked on NH 2 -NF as well. Finally, when we evaluated adhesion properties of adhesives composed of DGEBA resin/nh 2 -NF and TETA hardener/epoxy- NF on the basis of ASTM D3163, we observed improvements in the shear strength of 79 and 49%, respectively, in comparison with bare SiO 2 NF. This suggests that the chemical effects of organo-silanized SiO 2 NFs indeed contribute to the adhesion properties of adhesives. P1-G6-15 A Study on the Electrical Insulation Behavior of MgO with Multivalent Ions 다가이온을첨가한 MgO의전기적특성변화거동에관한연구최진삼 *, 공영민. 울산대학교 MgO는용융온도, 2,784~2,880 o C에도달할때가지거의열간구조변화가없는산화물소재이며, 우수한열전도성과고온전기절연특성을가지는물질이다. 그러나대기와반응하여수화반응, MgO+OH F Mg(OH 2 ) 이쉽게일어나불순물, 겉보기표면, 결합또는부착수에의해서전기절연성이감소하는경향이있다. 이를개선하기위하여본연구에서는 MgO에 V 2 O 5, B 2 O 3, FeO, F 2 O 3, P 2 O 5 등의다가이온을첨가하여입계영역에서의수화-탈수반응으로인한전기전도도변화거동에미치는이온특성을규명하고자하였다. 이를통해서플랭클또는쇼트키결함에따른홀전도와비화학양론적인결함감소에따른고온절연성개선에목표를두었다. 기존의연구에서 Fe 2+ 이온의첨가, 또는 Mg과유사한전하와크기를가지는금속이온은 MgO 격자내에녹아들어가서결함을감소시키기때문에전기전도도가감소하는것으로보았다. 그러나현연구에서는 Fe 2+ 이온의첨가보다는 P이온이첨가될때가장우수한절연거동을나타내었다. 이는 NaCl구조인 MgO는격자빈자리결함이 P양이온에의한빈자리감소와직접적인연관이있는것으로생각되었다. 1 / 2 O + + e V'' Mg + O o 따라서 MgO 의전기적특성은불순물 - 제어결함의농도, 그리고외부원소의도핑으로절연성개선이가능함을확인할수있었다. P1-G7-1 Manufacture of High Purity Alumina by Modified Bayer Process 변형베이어공정을이용한고순도알루미나제조최현빈 1*, 박상춘 1, 김대웅 2, 신광희 2. 1 한국알루미나 ( 주 ), 2 케이씨주식회사현재대부분의상업용알루미나 (Alumina) 분말생산에이용되고있는베이어 (Bayer) 공정은보크사이트 (Bauxite) 원광에서알루미나를얻는방법으로, 목적에따라다양한변형법이개발되었으며이를변형베이어법이라일컫는다. 본연구에서는고순도알루미나제조를위한변형베이어법을고안하였으며저렴한제조원가와단순화된공정요소도출을통해높은상업적가치를갖는고순도알루미나를제조하였다. 원료를가성소다 (NaOH) 에녹여알루민산나트륨 (Na 3 AlO 3 ) 을제조하는용해, 알루민산나트륨내의불순물을제거하는숙성및정제, 불순물이제거된알루민산나트륨내의수산화알루미늄석출후소성과분쇄의단계를거쳐백색의파우더를얻었으며, α-al 2 O 3 의결정상으로 4 N (99.99%) 이상의순도를가지며평균입도분포 0.4~3.0 µm 수준의고순도알루미나임을확인하였다. 144 한국세라믹학회

155 포스터발표 I P1-G7-2 The Application and Development of No Cement MgO Castable No cement MgO 캐스타블개발과실로적용이민구 *, 박영증, 김원갑, 이석근. 한국내화 ( 주 ) 사용자의조업조건이가혹화됨에따라내화물은그요구특성에맞추고자다양하게개발혹은개선되어왔으며, 산성내화물 ( 주원료 SiO 2 ), 중성내화물 ( 주원료 Al 2 O 3 ), 염기성내화물 ( 주원료 MgO) 이조업조건을고려하여적절하게선정되어왔다. 바인더로알루미나시멘트를사용하거나조업조건에따라알루미나시멘트를사용하지않는결합을적용하여고객의요구조건을맞추는추세로내화물은변화되어왔다. 당사는염기성물질에대해우수한내침식성을가지는내화물을개발하기위해소결마그네시아를주원료로하는 MgO 재질 No cement 캐스타블과 Al 2 O 3 재질의 Low cement 캐스타블, 콜로이달실리카결합의 Al 2 O 3 재질 No cement 캐스타블을비교평가하였다. 평가항목은열적특성으로열간곡강도 (1,200 o C), 열충격저항성 (1,400 o C), 도가니반응성 (1,400 o C) 을측정하여비교평가하였으며, 건조및소성 (1,350 o C) 후물리적특성평가를진행하였다. 생석회를생산하는 Shaft kiln에 MgO 캐스타블및 Al 2 O 3 Low cement 캐스타블을실로적용하였고, 18개월사용후잔존측정결과에서 MgO 캐스타블이 Al 2 O 3 Low cement 캐스타블보다우수한사용후결과를보였다. P1-G7-3 Development of Colloidal Silica bonded Al 2 O 3 -SiC-C Castable 콜로이달실리카결합 Al 2 O 3 -SiC-C 캐스타블개발이재훈 *, 김태완, 고진석, 이석근. 한국내화 ( 주 ) 일반적인캐스타블의결합재로사용되고있는알루미나시멘트의경우, 고온하에서 CaO 성분으로인한저융점화합물형성과 210~620 o C의비교적높은수분증발온도로인해건조시간이길고, 폭열의발생가능성을내재하고있는단점이있다. 이러한단점을보완하기위해고온에서의저융점화합물형성을억제하고, 건조가용이한콜로이달실리카를결합재로사용한 Al 2 O 3 -SiC-C 캐스타블 ( 이하 CSC) 을개발하고자다양한실험을진행하였다. 본연구에서는 CSC와알루미나시멘트를결합재로사용한캐스타블 (CAC) 의고온특성과건조성능을비교평가하였다. 고온특성을평가하기위해열간곡강도, 스폴링및회전식침식시험을진행하였다. 또한건조성능을평가하기위해승온에따른캐스타블의질량변화를측정하였으며통기율을측정하였다. 시험결과, CAC 대비고온특성과건조성능이우수한 CSC를개발하였다. 고온특성개선의원인으로, CSC는고온에서의저융점화합물억제와소결중콜로이달실리카와알루미나의반응으로형성되는뮬라이트에의한결과로판단되며, 콜로이달실리카의 Siloxane 결합에따른 H 2 O 분자발생에기인하여원활한탈수현상으로건조성능이개선된것으로판단된다. P1-G7-4 A Experimental Study on the Water Permeability Test of Crack Width Using Inorganic and Organic Self-healing Additives 무기및유기계자기치유혼화재를사용하여균열폭에따른투수시험에관한실험적연구김진응 *, 황지순, 민관홍. ( 주 ) 인트켐우리나라는단기간에고속성장으로인해경제성장을이룬국가중하나이다. 오늘날까지도로, 댐, 항만등사회기반시설의수요가급증함과동시에콘크리트수요역시증가되었다. 하지만 1980년대부터지어진구조물은현재노후화가진행되고있다. 그원인중하나 인균열을예로들수있다. 구조물에발생한균열은계속적으로전이되어겨울철수분및제설제침투로인해철근이부식되고콘크리트가박리되는현상이발생하기도한다. 이러한문제를해결하기위해서최근노후된구조물에보수공법을활용하여사용수명을연장하는방법또는보수재의개발등연구가활발히진행중에있다. 이에따라본연구는 OPC 와유기및무기계자기치유혼화재를사용하여인공균열을도입하여균열폭에따라자기치유성능을확인하는실험을진행하였다. 기초특성인 Flow, 압축강도, 균열폭에따른투수시험을진행하였다. 그결과, Flow 는유무기자기치유혼화재를사용한타입이 Plain (OPC) 보다감소하지만작업성은문제가없는것으로확인되었고압축강도의경우 Plain (OPC) 대비 85% 의강도발현을하였다. 균열폭 (0.22~0.27 mm) 에따른투수시험결과, Plain (OPC) 보다유무기자기치유혼화재를사용한타입의투수율이낮은것으로확인되었다. P1-G7-5 Cold Spray Process for the Formation of Oxidation Resistant Layer on the Surface of Nuclear Fuel Cladding and its Effects on Mechanical Behavior 핵연료피복관의내산화표면층생성을위한저온분사공정적용및기계적특성평가박동준 *, 김현길, 정양일, 박정환, 이영호, 최병권, 양재호. 한국원자력연구원현재가압경수로핵연료로사용되고있는지르코늄계합금피복관의고온내상화성을획기적으로증대시켜원전사고시에도핵연료안전을담보할수있는사고저항성피복관개발이진행되고있다. 기존피복관표면에내산화특성이매우우수한표면층을형성시켜고온사고환경에서피복관의산화를최대한억제시키고자하였으며이를위하여저온분사공정으로철계합금을기존피복관표면에생성시켰다. 하지만철계합금은지르코늄과비교적낮은온도에서공정반응을일으켜금속간화합물을발생시킬수있어이를방지하기위한몰리브데늄층을모재인지르코늄과표면층인철계합금사이에확산방지막으로서형성하였다. 본연구에서는저온분사공정으로두층을지르코늄판재표면에생성시켰으며생성된표면층미세구조를투과전자현미경으로분석하였다. 또한제조된표면코팅판재를이용한인장시험으로기계적특성을평가하였다. 그결과저온분사후코팅분말의미세구조변화, 계면결합특성거동을관찰할수있었으며저온분사공정으로인한지르코늄표면의가공경화현상으로표면처리시편의강도가증가할수있음을밝혀내었다. P1-G7-6 Effect of Black Coring on Firing Temperature of Artificially Lightweight Aggregate 블랙코어링현상이인공경량골재소성온도에미치는영향권정규 *, 위영민, 이기강. 경기대학교본연구에서는인공경량공재제조시표면융착문제를해결하기위해 Black Core 현상을발현하여소성온도를저감하는연구를진행하였다. 이를위한기초데이터작성을위해산성백토를현장조건에준하여 1200 o C에서직화소성하여소성평균밀도값을측정하였다. 이후, 탄소 0~3% 및철분 0~15% 를각각산성백토에치환첨가하여 1100 o C~1175 o C에서직화소성하여발포현상및단면을관찰하였다. 철분의환원에의해생성되는 Black Core 현상으로인해소성온도저하및골재융착현상개선을기대하였고그에대한연구결과, Black Core 현상으로인해소결온도가낮아져실기조건인 1150 o C에서 1175 o C의온도에서도골재가융착되지않아실기온도에서도경량골재제조가가능하다는것을확인하였다. 또한이과 한국세라믹학회 145

156 2018 년한국세라믹학회춘계연구발표회 정을통해발포가스생성을증가시켜골재의경량화역시가능하였고, 발포가스생성과정으로인해적정소성온도가낮아져기존경량골재대비에너지절감효과가있는것으로나타났다. P1-G7-7 Manufacture of Artificial Lightweight Aggregate by Recycling Water Treatment Sludge 정수슬러지를재활용한인공경량골재의제조우희수 *, 이기강. 경기대학교본연구에서는정수처리시설에서발생하는정수슬러지로인공경량골재를제조하여환경친화적인자원으로활용할수있는가능성을검토하였다. 그중, 정수슬러지와몬트모릴로나이트 (Ca- Montmorillonite) 를주성분으로하는산성백토를이용하여시료를제작하고, 정수슬러지함유량을 0~50% 로조절하였다. 1150~1250 o C 온도에서직화소성방식으로소성하여경량골재의물성과단면을관찰하였다. 이때, 시료의물성은 (KS F 2503 : 2007) 규격에따라절대건조상태의밀도와흡수율을측정하였고, 골재단면은 Camscope ( 의료용광원장치 Dr. Camscope M ) 를활용하여측정하였다. 실험결과, 소성온도 1200 o C 이상에서정수슬러지 30%~50% 배합비로비중 1보다낮은초경량골재를제조하여정수슬러지의재활용가능성을확인하였다. P1-G7-8 Study on the Reduction of Water Absorption rate in Artificial Lightweight Aggregates using Hydrophonic Property 인공경량골재의소수성코팅을통한흡수율저감연구이지언 *, 이기강. 경기대학교본연구는인공경량골재의높은흡수율로인한콘크리트배합시강도저하및재료분리현상을개선하기위해인공경량골재의표면을소수성으로코팅하여흡수율저감을목적으로하여진행했다. 인공경량골재를각 0.088~1.18 mm, 1.18~5 mm, 0.088~5 mm 로입도구간을나누고, Si 발수제 (KCC Si 1200Z) 와 ODPA (1- Octadecylphosphonicacid) 를이용하여표면코팅을진행했다. 접촉각측정과 FT-IR 분석을통해코팅의정도를확인하였으며각기입도분포및코팅제에따라세골재를 KS F 2504를기반으로흡수율을측정하였다. Si 발수제코팅은 0.088~1.18 mm의입도에서도우수한, 평균 4% 이하의흡수율을보였으며 ODPA 코팅세골재는 1.18~5 mm의입도에서평균 10% 정도의흡수율을보였다. P1-G7-9 Fabrication of Complex Designed Silica-based Ceramic Core for Precision Casting through Injection Moulding 세라믹사출공정을이용한주조용복잡형상의실리카기반세라믹코어의제조여정구 *, 박정수, 이진석. 한국에너지기술연구원복잡한형상을가지는실리카계세라믹코어는세라믹사출성형공정으로제작된다. 상업용세라믹사출성형기를이용하여사출성형체를얻었고, 성형체를고온으로승온시켜결합제의탈지와열처리공정을진행하였다. 세라믹코어의기계적성질에미치는열처리조건에대한영향도열처리온도와승온속도등의변수에대하여조사하였다. 탈지단계에서는승온속도를낮춰세라믹스의표면이부풀어오르는현상을조절하였다. 높은온도에서열처리를하거나열처리유지시간이길어졌을때세라믹스의굽힘강도가감소하고선수축률은늘어나는경향을보였다. 높은온도나장시간열처리를할때발생하는크리스토발라이트로의결정화는부피수축과미세균열을동반하므로기계적물성을저하시킬수있다 o C에서 12시간소결한세라믹코어는왁스사출과쉘몰드공정을성공적으로진행할수있었다. P1-G7-10 Study on the Complex Designed Silica Ceramic Core Photopolymerized and its Fabrication Used for Casting 주조용복잡형상의실리카세라믹중자의광중합방식의제조연구여정구 *, 박정수, 양승철. 한국에너지기술연구원본연구에서는복잡한형상을가지는실리카세라믹중자를광중합시켜성형체를얻었고이후고온에서열처리하여최종제품을제작하였다. 세라믹코어의슬러리를준비하였고, 아크릴계수지와광중합반응을위한개시제를첨가하였으며, 실리카성분의함량을최대한으로증가시켜슬러리의고형분을높일수있었다. 세라믹과아크릴이혼합된슬러리에광원으로자외선을조사하였고세라믹중자성형체를만들수있었다. 제작한성형체는 1200도이상의고온에서열처리를행하여유기성분을완전히제거하였고최종적으로세라믹성분으로구성되는다공성중자를얻었다. 제조한중자의물성을평가하기위하여상온꺽임강도, 수축률, X선회절패턴및주사전자현미경등으로분석하였고, 성형및열처리후외형의변화를관찰하였다. 결과적으로외형상뒤틀림등의결함이없으며충분한취급강도를가지는실리카세라믹중자를만들었다. P1-G7-11 Research of Application Properties of Limestone Mine by-product for Aggregate of Exhausted Mine Backfill 폐광산채움재골재로서석회석광산부산물의활용성능연구문기연 1*, 조진상 1, 최문관 1, 조계홍 1, 안지환 2. 1 한국석회석신소재연구소, 2 한국지질자원연구원 CO 2 배출저감을위한복합탄산염채움재의폐광산주입기법은 CO 2 선택적포집후지반이나해양지층에저장하는 CCS 기법의낮은경제성과저장한계를극복하기위한대안중하나이다. 광산채움재의적절한채움시공을위해서는시공설계안이마련되어야하는데채움광산이되는광산의특성, 채굴적형태, 규모, 채굴당시적용되었던채광법, 전체채굴적중채움재가시공될비율등을고려해채움재혼합조성물의배합설계가도출되어야한다. 본연구에서는광산채움재적용대상광산의부산물을이용한골재적용성을확인하고자하였으며, 이에 3개갱내채굴석회석광산의파쇄공정에서배출되어나오는 9개시료를샘플링하였다. 채취한시료는별도의전처리없이국내관련법규, 표준및시방서에제시된기준에따라특성평가를실시하였다. 실험결과, 9종석회석광산부산물중 1종은골재크기 10 mm 이상으로굵은골재로서활용가능하며, 기타 8종은굵은골재, 잔골재및미분이혼재되어있는형태로서자체적용또는분급에의한적용가능성을확인할수있었다. 또한대부분의시료가특성기준값에부합하며골재로서실적용배합공정에투입이가능할것으로판단된다. 이논문은 2017년도정부 ( 과학기술정보통신부, 환경부, 산업통상자원부 ) 의재원으로한국연구재단-탄소자원화국가전략프로젝트사업의지원을받아수행함. (2017M3D8A ) P1-SS2-1 Separation of Quartz and Halloysite Nano Tubes (HNTs) by Homogenization of Sancheong Kaolins 균질화공정을통한산청고령토로부터석영과튜브형할로이사이트의분리황규홍 1*, 이윤기 1, 이종국 2, 박관식 3, 전병세 3. 1 경상대학교, 2 조선대학교, 3 풍산광업 Natural halloysite kaolin contains a lot of impurities such as quartz phases and varies in morphology and size during their formation in the earth. So to utilize as a new type of natural nano material, removing quartz impurities from kaolin clays without scathe the tube morphologies are necessary. So to remove quartz impurities from 146 한국세라믹학회

157 포스터발표 I kaolin by forming a well deflocculated aqueous slip without fracturing the morphology of tubes, the slip of homogenized halloysite clay was recovered by adding polyvalent metallic cations and anionic polyelectrolyte flocculants simultaneously to selectively flocculate the mixture of quartz and halloysite, whereby the halloysite particles form floes and the tubular halloysite remains in suspensions. Then, the uniform size and tubular shape of halloysite was obtained which could be suitably used as a container or a carrier to encapsulate nanomaterials. P1-SS2-2 Properties of YBO 3 Thin Films co-doped with Dy and Eu Dy와 Eu가동시도핑된 YBO 3 박막의특성하순종 *, 신종언. 신라대학교최근에디스플레이와조명등에응용하기위하여백색을구현하기위한형광체제조에많은관심이고조되고있다. 본연구에서는라디오파마그네트론스퍼터링방법을사용하여성장온도 o C 에서 Dy와 Eu 이온을도핑한 YBO 3 형광체박막을석영기판위에증착하고 1000 o C에서급속열처리를수행하였다. 특히, 성장온도변화에따른형광체박막의구조, 표면형상, 결정입자의크기, 광학투과율, 밴드갭에너지, 흡광과발광스펙트럼의특성변화를체계적으로조사하였다. 직경 1인치의 YBO 3 :Dy 3+,Eu 3+ 스퍼터링타겟은초기물질 Y 2 O 3, H 3 BO 3, Dy 2 O 3, Eu 2 O 3 을화학양론적으로준비하였고, 혼합한물질은에탄올, ZrO 2 볼과함께플라스틱사발에넣고, 400 rpm의속도로 30시간볼밀과건조시킨후, 전기로에장입하여 500 o C에서 5시간동안하소공정과 1100 o C에서 5시간동안소결하여유압프레스를사용하여원형소결체로제조하였다. 스퍼터링챔버의초기진공도는 Torr, Ar 가스는 40 sccm, 증착시진공은 35 mtorr, rf 파워는 40 W에서 4시간동안증착하여박막을성장시켰다 o C에서성장한박막의광학적특성을측정하였으며, 각성장온도에서 Dy와 Eu의발광효율이다르게분석되었다. 성장온도 100 o C에서는 Dy와 Eu의발광은각각 572 nm ( 황색 ), 615 nm ( 적색 ) 에서현저하게분리되어나타났으나, 400 o C에서는 Dy에의한발광은소멸되었고, Eu에의한발광은미세하게관측되었다. 본실험결과는증착온도를적절히제어함으로써최적의발광효율을갖는형광체박막을성장시킬수있음을제시한다. P1-SS2-3 Effect of Deposition Temperature on the Properties of Bi 2 MoO 6 :Eu Red-Emitting Phosphor Thin Films 증착온도에따른 Bi 2 MoO 6 :Eu 적색형광체박막의특성이승민 *, 조신호. 신라대학교최근에 Bi 2 MoO 6 와같은광학적특성이우수한몰리브덴산염물질을형광체, 섬광검출기, 레이저, 광전자소자에응용하기위한연구가많은관심을끌고있다. 본연구에서는증착온도의변화에따른라디오파마그네트론스퍼터링방법으로성장한 Bi 2 MoO 6 :Eu 박막의구조, 표면및발광특성을조사하였다. 스퍼터링타겟은고상반응법으로 Eu 이온이도핑된 Bi 2 MoO 6 형광체분말을합성하였으며, 프레스를사용하여직경 1인치의원형소결체로제작하였다. 증착조건으로는, 스퍼터링압력 Torr와파워 40 W에서증착온도를 로변화시키면서 Bi 2 MoO 6 박막을성장시켰으며, 성장된박막의결정구조, 표면형상과광학특성은각각 X-선회절법, 주사전자현미경, 형광광도계와자외선 -가시광선분광계를사용하여측정하였다. 100에서증착한 Bi 2 MoO 6 :Eu 박막의흡광스펙트럼은 615 nm로제어하였을때, 311 nm에정점을갖고 nm 영역에걸쳐서광범위하게분포하는전하전달밴드와 455 nm의흡 광신호를나타내었다. 박막의발광스펙트럼은 308 nm 로여기하였을때, 가장강한 615 nm 의적색발광피크와상대적으로발광세기가약한 591 nm 의주황색과 702 nm 의적색발광이관측되었다. P1-SS2-4 Effect of Rapid Thermal Annealing Temperature on the Properties of Eu-doped Bi 2 MoO 6 Thin Films 급속열처리온도가 Eu 이온이도핑된 Bi 2 MoO 6 박막에미치는영향박수진 *, 조신호. 신라대학교형광체박막을전계발광소자와디스플레이패널에응용하기위해서는발광세기가강한세종류의기본색깔인청색, 녹색, 적색을방출하는고품질의형광체박막을성장시키는기술이필요하다. 특히, 발광소재의광학밴드갭에너지와발광세기는증착챔버의압력, 기판온도, 주입되는가스의양, 파워, 열처리온도와같은여러변수에따라달라진다. 본연구에서는급속열처리온도의변화에따른라디오파마그네트론스퍼터링방법으로성장한 Bi 2 MoO 6 :Eu 형광체박막의결정구조, 투과율, 밴드갭에너지, 발광특성을조사하였다. 스퍼터링타겟은고상반응법을사용하여직접제조하였으며, 라디오파마그네트론스퍼터링성장시최대발광세기를나타내는형광체박막을제조하기위한최적의열처리온도를결정하였다. 석영기판위에증착한박막은 700, 800, 900, 1000에서 30분동안급속열처리를수행하였다. 방출파장 615 nm로제어시켰을때, 형광체박막의흡광스펙트럼은 307 nm에서관측되었고, 발광스펙트럼은발광세기가가장강한 615 nm에주피크를갖는적색발광 ( 5 D 0-7 F 2 ) 스펙트럼과발광세기가상대적으로약한 591 nm와 702 nm에피크를갖는주황색 ( 5 D 0-7 F 1 ) 과적색발광 ( 5 D 0-7 F 4 ) 스펙트럼으로구성되었다. 열처리온도가증가함에따라모든박막의발광스펙트럼의세기는증가하는추세를보였으며, Tauc 의식을사용하여밴드갭에너지를계산하였다. P1-SS2-5 Effect of Electric Fields during Flash Sintering of 3mol% Yttria-stabilized ZrO 2 3몰 % 이트리아안정화지르코니아의플래시소결중전기장효과황창훈 1*, 웨이친 2, H, 마지디 2, 윤존도 1, 클라우스반벤템 2. 1 경남대학교, 2 미국유씨데이비스 Systematic microstructural statistics for 3 mol% yttria-stabilized zirconia synthesized by both conventional sintering and flash sintering with AC and DC current were obtained. Within the gauge section flash sintered microstructures were indistinguishable from those synthesized by conventional sintering procedures. With both techniques full densification was obtained. However, from both AC and DC flash sintered specimens heterogeneous grain size distributions and residual porosity were observed in the proximity of the electrodes. After DC sintering a nearly 400 times increased average grain size was observed near cathode compared to the gauge section, unlike areas close to the anode. However, according to FEM simulation, there was a temperature gradient from the surface to the volume of the AC flash sintered body. Concepts of Joule heating alone were not sufficient to explain the experimental observations. Instead, the activation energy for grain growth close to the cathode is lowered considerably during flash sintering, hence suggesting that electrode effects can cause significant heterogeneities in microstructure evolution during flash sintering. Microstructural characterization further indicated that micro-fracturing during green-pressing and variations in contact resistance between the electrodes and the ceramic may also contribute to grain size gradients and, hence, local variations of physical properties. 한국세라믹학회 147

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161 포스터발표 II P2-G1-1 Piezoelectric Properties and Microstructure of Doped- (K,Na)NbO 3 Single Crystals Doped-(K,Na)NbO 3 단결정의압전특성및미세구조조경훈 1*, 유일열 1, 곽도우 1, 안철우 2, 한병동 2, 최종진 2. 1 금오공과대학교, 2 재료연구소최근일반적인고상소결법을이용한 centimeter-scale의 (K,Na)NbO 3 계열단결정성장에대한연구결과들이보고되고있다. 고비용의공정을사용하지않고짧은시간에소자적용이가능한크기의단결정을확보할수있다는점과무연계조성이라는측면에서 (K,Na)NbO 3 계열단결정성장연구는차세대친환경압전소자응용을위한기술적중요성이높다. (K,Na)NbO 3 계열단결정성장은알칼리원소의휘발로인한액상형성과 donor-ion의 compensation 효과에의한매우빠른비정상입성장을기반으로이루어지며다양한원소들의첨가연구를통해결정상, 전이온도및압전특성의제어가가능할것으로기대된다. 본연구에서는 Ba이첨가된 (K,Na)NbO 3 조성의단결정과 Ba, Li, Cu를첨가하여성장시킨 (K,Na)NbO 3 단결정의결정방향에따른특성에대해보고한다. 성장시킨단결정들을 [100], [110] 결정방향별로가공하여분극공정후압전및유전특성을평가하고각각의결정면들에대한미세구조를관찰하였다. 두가지단결정조성모두 [100] 방향으로의압전특성이 [110] 방향보다높게나타났으며상전이온도제어를통해단결정의압전성능을제어할수있음을보고한다. P2-G1-2 Study on the Structural Control of Magnetoelectric Laminate Device Employing 15-mode Piezoelectric Composite 15-모드압전복합체로구성되는자기전기적층소자의구조제어연구조경훈 1*, 이용우 1, 유일열 1, 곽도우 1, 안철우 2. 1 금오공과대학교, 2 재료연구소자기전기소자는자기장을전기장으로혹은전기장을자기장으로변환시키는소자로서센서, 액츄에이터, 메모리, 고주파소자, 광학소자및에너지하베스팅등다양한응용분야가제안되고있다. 자왜 / 압전복합체로구성되는자기전기소자에대한기존의많은연구들에서는높은압전특성을나타내는 15-mode 압전소재를적용한사례를찾아보기힘들며, 이는고성능의자기전기효과를나타낼수있는 15-mode 압전층및소자구조의설계기술과구현공정기술연구의부재에기인한다. 본연구에서는 15-mode 압전복합체를사용한자왜 / 압전적층복합체소자의구조제어가자기전기성능에미치는영향에대해보고한다. 구조제어인자로서 15-mode 압전복합체를구성하는개별적압전층의 aspect ratio, 15-mode 압전복합체의두께, 자기전기적층복합체를구성하는자왜층과압전층의두께비율을설정하였다. 개별압전층의 aspect ratio에따른 15- mode 압전복합체의압전성능을보고하고, 각각변수들의제어를통해제작된소자들의비공진대역및공진대역에서의자기전기특성을평가및분석한다. P2-G1-3 Systematic Tuning of Hydrogen-induced Phase Transition in VO 2 Epitaxial Thin Film VO 2 에피박막을이용한수소에의해유발된상전이의체계적인튜닝윤효진 1*, 최민석 2, 박재성 1, 임태원 3, 임규욱 4, 최시영 1, 손준우 1. 1 포항공과대학교, 2 인하대학교, 3 재료연구소, 4 포항가속기연구소 Phase transition by band filling control is one of the core concepts in correlated electronic systems. Unlike the substitutional dopants, hydrogen plays a key role in effectively filling significant amount of carriers in the empty narrow d band by reversibly adding it into interstitial sites and supplying carriers. Vanadium dioxide (VO 2 ), typical correlated oxide with 3d 1 electronic configuration, can also reversibly incorporate hydrogen atoms into its interstitial sites and simultaneously occurs phase transition by its 3d band filling. Here, we demonstrate that as many as two hydrogen atoms can be incorporated into each VO 2 unit cell, and that hydrogen is reversibly absorbed into, and released from, VO 2 without destroying its lattice framework. This hydrogenation process demonstrates two-step insulator (VO 2 ) metal (H x VO 2 ) insulator (HVO 2 ) phase modulation during inter-integer d-band filling. Moreover, HVO 2 can be thermodynamically stabilized regardless of facet direction of VO 2 epilayer, but remarkable discrepancy in kinetics of phase modulation was clearly visualized depending on the crystal facet. The unprecedented insulating HVO 2 with 3d 2 configuration is attributed to highly doped electrons via hydrogenation process in conjunction with huge lattice expansion. Our finding suggests the possibility of reversible and dynamic control of topotactic phase modulation in VO 2 and opens up the potential application in proton-based Mottronics and novel hydrogen storage. P2-G1-4 Effect of Crystallographic Orientation on the Energy Storage Characteristics of PZT Thin Films 임경원 1,2*, Mahesh Peddigari 1, Ventateswaru Annapureddy 1, 황건태 1, 최종진 1, 김가연 1, 이삼녕 2, 류정호 1. 1 재료연구소, 2 한국해양대학교 Capacitors with high energy density and high discharging rate have been attracting attention for electric vehicles and military applications, in which the rapid discharge of large amounts of electric energy is required. Since ferroelectric thin film of perovskite structure has different polarization characteristics according to its crystallographic orientation, the charged energy density can be tailored. In this study, we investigated the effect of the crystallographic orientation of PZT (52/48) thin films grown by chemical solution deposition on the energy storage capability and discharging rate. The {001} and randomly oriented PZT thin films were prepared and their dielectric and ferroelectric properties, stored energy densities, and discharging rates were characterized. The storage energy density of {001}- oriented film was found to be superior to that of other films, while its efficiency was nearly the same. It is believed that {001} oriented PZT thin film has great potential for use in high performance capacitors with large energy density. P2-G1-5 Fabrication and Characteristic Evolution of Electromagnetic Conductive Materials for Induction Heating of Ceramic Cookware 내열세라믹용기의인덕션가열을위한전자기유도용도전소재제조및특성평가이상헌 1*, 이동원 1, 조명연 2, 김용남 1, 이종섭 3, 오종민 2. 1 한국산업기술시험원, 2 광운대학교, 3 카멜최근아파트, 호텔및휴장시설에청정성및안정성때문에인덕션레인지의활용도가커지고있다. 하지만인덕션레인지는기기내의코일에서발생하는유도전류및자기력을이용해자기적성질을지닌용기재질바닥면에와류전류를발생시켜용기를가열하는방식이기때문에비철소재나유리및도자기와같은소재로만들어진용기는인덕션레인지에직접적으로사용할수없는문제점이있 한국세라믹학회 151

162 2018 년한국세라믹학회춘계연구발표회 다. 이런문제점을해결하기위해서는용기바닥면에자기적성질을가진도판을부착하거나용기바닥면에용사법및전사코팅방법을이용하여전도성코팅을형성하는기법이적용될수있다. 본연구에서는전사코팅방법을이용하여내열세라믹용기바닥면에도전소재를코팅하였으며, Ag, Cu, Ni 등과같은다양한도전소재를사용하여전사코팅방법에응용가능한조성개발및최적화연구를진행하였다. 또한전사코팅방법으로제조된내열세라믹용기를대상으로내구성및신뢰성평가를진행하였다. P2-G1-6 Fabrication and Characteristics of Ceramic Substrate for Semiconductor Probe Card 메모리반도체프로브카드용세라믹기판의제조및특성이동원 1*, 이상헌 1, 김용남 1, 류두형 2, 조명연 3, 오종민 3. 1 한국산업기술시험원, 2 ( 주 ) 우진WTP, 3 광운대학교최근 DRAM/NAND Flash 메모리반도체의급격한증가로인해저가격의공용화세라믹기판의수요가급증하였고이를위해열팽창계수가낮고내구성이뛰어난세라믹기판재료의개발이요구되고있다. 현재메모리반도체프로브카드용세라믹기판으로는강도가우수한뮬라이트와내열충격성이강한코디어라이트를혼합하여우수한기계적, 열적, 전기적특성을가진뮬라이트-코디어라이트복합재료에대한연구가활발히진행되고있다. 따라서본연구에서는열팽창계수가실리콘웨이퍼와유사하고우수한기계적특성을가진뮬라이트-코디어라이트복합재료를제조하기위해저열팽창계수와고강도특성을만족하는세라믹조성개발연구를진행하였다. 세라믹조성개발연구를위해분무건조조건, 분말입자크기제어, 분말의무게비및열처리조건등을고려하여세라믹기판을제조하였다. 또한제조된세라믹기판을대상으로미세구조관찰, 열적및기계적특성을평가하여뮬라이트- 코디어라이트조성비에따른세라믹기판과물성사이의상관관계에관하여연구하였다. P2-G1-7 Highly Stretchable, Photo-curable Polymer Composite Enabled by Systematic Urethane Linkage Control 우레탄결합제어를통한고연신, 광경화성고분자복합체제조정과정 *, 양현승, 박성대, 이우성. 전자부품연구원 Photo-curable polymers are widely used in 3D printing techniques for fabricating 3D-printed objects with high resolution. Particularly, flexible photo-curable polymer resin is of great interest because of its distinctive mechanical properties. Herein, the effect of urethane linkage on the mechanical property of polymer composite was studied. First, isocyanate terminated polyol was synthesized by reacting isocyanate compounds with bis(hydroxyalkyl) terminated polyol. Next, the pre-polymer was functionalized through introducing methacrylate groups at the end of the chains. The structure of photocurable polymer was investigated by fourier transform infrared spectroscopy (FTIR). To identify the effect of urethane linkage, viscosity and molecular weight were determined by viscometer and gel permeation chromatography (GPC). Mechanical properties of photo-curable resin were measured using universal testing machine. On increasing the urethane reaction time, elongation at break and tear strength of the photo-curable polymer increases. This study aims to demonstrate the importance of controlling the degree of urethane linkage for obtaining desirable mechanical property. P2-G1-8 Effect of Oxygen Partial Pressure on the Properties of ZnO:(Ga,Sb) Thin Films Grown by PLD PLD 법으로증착한 ZnO:(Ga,Sb) 박막의산소분압에따른특성변화이지원 *, 이정아, 허영우, 이준형, 김정주. 경북대학교 ZnO 는 II-VI 족반도체로 3.4 ev 의넓은 band gap 과 60 mev 의큰 Exciton binding energy 로인해 LED, LD 등광전소자의소재로각광받고있다. Intrinsic defect 인 Zn interstitial 과 O vacancy 로인해 ZnO 는기본적으로 n-type conduction 을띠게된다. ZnO 를이용한소자의성능을향상시키기위해서는 p-type conduction 을띠는 ZnO 에대한연구가필요하다. 1 족과 5 족의원소를 acceptor 로도핑하여 p-type ZnO 를제작하고있지만 self-compensation 과낮은 acceptor solubility 로인해안정한 p-type ZnO 제작에어려움을겪고있다. 본실험에서는 Pulsed Laser Deposition (PLD) 으로 ZnO:Ga 0.01 Sb 0.02 박막을제작하였다. Acceptor 로사용된 Sb 의고용량을증가시키기위해 co-doping 법을이용하였으며, O vacancy 와관련된 selfcompensation 의영향을확인하기위하여 oxygen pressure 를변화시키면서박막을증착하였다. 기판으로는 c-plane sapphire 를사용하였고 500 o C 의증착온도에서 oxygen pressure 를 mtorr 의범위로바꿔가며증착하였다. 증착시간은 2 시간으로고정하였다. 증착된박막의전기적, 구조적물성은 XRD, SEM, XPS, Hall measurement 등을사용하여관찰되었다. ZnO:Ga 0.01 Sb 0.02 박막의 (0002) 면에대해 pole figure 분석을해보았을때 (0002) 우선배향으로성장하였으나일부도메인은 32 기울어진상태로성장하였음을확인하였다. P2-G1-9 Influence of A-site Deficiencies on the Electrical Properties of BNT-BKT Lead-free Piezoceramics BNT-BKT 무연압전세라믹스의 A-site 이온결핍에따른전기적특성변화이건주 1*, 김태은 1, 김용주 1, 조재현 1, 홍창효 1, 안창원 2, 조욱 1. 1 울산과학기술원, 2 울산대학교 We investigated the effect of A-site deficiencies in (1-x)Bi 1/2 Na 1/2 TiO 3 - xbi 1/2 K 1/2 TiO 3 (BNT-BKT) system to have an insight into the origin of the formation of relaxor ferroelectrics. The compositions were selected on Bi 1/2 Na 1/2 TiO 3 (BNT), Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 (BNKT18), Bi 1/2 (Na 0.78 K 0.22 ) 1/2 TiO 3 (BNKT22), Bi 1/2 (Na 0.75 K 0.25 ) 1/2 TiO 3 (BNKT25) and Bi 1/2 (Na 0.45 K 0.55 ) 1/2 TiO 3 (BNKT55), which include rhombohedral (BNT, BNKT15), morphotropic phase boundary (BNKT18, 22) and tetragonal phases (BNKT25, BNKT55). A-site deficiencies in BNT- BKT system were realized by taking a part of A-site cations artificially from the lattice of the Bi 1/2 (Na 1-x K x ) 1/2-y TiO 3 (deficiency level y = 0, 1, 2, and 4). In pure BNT, with increasing A-site vacancy concentration, the polarization hysteresis loop becomes slimmer with a reduced negative strain, implying that the free energy minimum tips towards the relaxor state. Interestingly, the effect of vacancies was most significant in BNKT22, featured by the development of socalled constricted hysteresis and a large strain with little negative strain at 4 mol % of A-site vacancy concentration. In contrast, this effect seems ineffective at all in BNKT55. In this study, we present a series of experimental works to reveal the underlying mechanism for the role of vacancies on the stability of the long-range ferroelectric order within the context of crystallographic symmetry. P2-G1-10 Ionic Conductivity Mechanism Analysis of La and Y co-doped Ceria La, Y가동시첨가된 Ceria의이온전도기구분석 152 한국세라믹학회

163 포스터발표 II 이지원 *, 이호창, 이정아, 이준형, 허영우, 김정주. 경북대학교 La 와 Y 의총량을 20 at% 로고정하여 CeO 2 에동시첨가한뒤, 임피던스분석법으로산소공공의 transfer energy 를조사하였다. Transfer energy 는 dissociation energy 와 migration energy 로나뉜다. 입자내에서 Dissociation energy 는주위양이온과결합된산소공공이결합을끊고 free 한상태가되는데요구되는 energy 이고, migration energy 는 free 한산소공공이인접한자리로이동할때요구되는 energy 이다. 입계에서 migration energy 는산소공공이넘어야할 space charge potential 의크기와연관이있다. La 함량이증가하고 Y 의함량이감소할수록격자상수가증가하여입자내부에서산소공공의 migration energy 가감소하였다. La 과 Y 이 2 : 18 의비율로 CeO 2 에첨가될때, 격자상수는순수한 CeO 2 의격자상수와거의동일하다. 이경우, 격자내의 strain energy 는최소화될수있었으며, 그결과입자내부에서산소공공의 dissociation energy 가매우낮아진다. 입계에서 migration energy 는 La 함량이증가함에따라감소하였다. 이것은 dopant 의 segregation 정도에의해설명될수있으며, TEM-EDS 로확인하였다. P2-G1-11 Energy Storage and Discharging Characteristics of 0.65Pb(Mg 1/3 Nb 2/3 )O PbTiO 3 Thick Films by Aerosol-Deposition AD공정으로만들어진 0.65Pb(Mg 1/3 Nb 2/3 )O PbTiO 3 필름의에너지저장및충방전특성김가연 1*, Haribabu Palneedi 1, 황건태 1, 임경원 1, Mahesh Peddigari 1, 이정우 2, 류정호 1. 1 재료연구소, 2 부산대학교 Ferroelectrics are being used for various applications such as electric capacitors, memory devices, sensors and actuators thanks to their unique electric nature i.e., spontaneous polarization. Among these applications, ferroelectrics have high potential for the capacitors with high storage energy density with exceptionally rapid discharging rate. Amount of stored energy in ferroelectric materials is proportional to the outside area of the Polarization-Electric field (P-E) hysteresis loop of them. Thus, a relaxor ferroelectric (RF) can be an ideal candidate for such applications, since they have slimmer P-E hysteresis loop compare to that of the normal ferroelectric materials. In this study, 4um-thick 0.65Pb(Mg 1/3 Nb 2/3 )O PbTiO 3 (PMN-PT) RF films were fabricated by Aerosol-Deposition (AD) on a platinized Si wafer and the energy storage and discharging characteristics were investigated with different post-annealing temperatures. It was found that the crystallinity and the energy storage characteristics were strongly influenced by the thermal annealing temperature of the films. The film annealed at 500 o C showed higher energy storage density of 12.5 J/cm 3 and efficiency (80%), along with faster discharging (24 ns). It is believed that the AD PMN-PT thick films can be potential candidate materials for a capacitor bank of electric vehicles that discharges instantly. P2-G1-12 Co-firing of PZT Piezoelectric Actuators using Cu Internal Electrodes Cu 내부전극을사용한 PZT 압전액츄에이터의동시소성김재혁 1*, 여동훈 2, 신효순 2, 남산 1. 1 고려대학교, 2 한국세라믹기술원 PZT는우수한압전및유전특성으로압전액츄에이터에많이적용되고있다. 일반적인다층압전액츄에이터는 Ag-Pd 전극을채용하고있으나, Ag migration 현상에의해절연저항이감소하는문제점이있다. 본연구에서는, 이를극복하기위하여내부전극으로 Cu를적용하여 PZT와의동시소성을진행하였다. 그결과, 산소분압이 10 9 이상일경우 Cu 전극이산화되었으며 이하일경우 PZT 세라믹이환원되어압전효과가감소하였다. 환원분위기내탈지공정, 소결온도및산소의분압제어를통하여 Cu 내부전극의산화를억제하고, PZT 의내부결함을최소화함으로써우수한압전특성을나타내었다. P2-G1-13 Effect of Binder Content on Warpage Phenomenon in Co-firing of Cordierite/W Electrode 코디어라이트 /W 전극의동시소성에서바인더함량이시트휨현상에미치는영향임진현 1*, 김시연 2, 여동훈 3, 신효순 3, 정대용 1. 1 인하대학교, 2 고려대학교, 3 한국세라믹기술원코디어라이트는 alumina-magnesia-silica 계화합물로높은열충격저항성과낮은열팽창특성으로인하여내열충격성이우수하며, 높은전기절연성과낮은유전특성을가지므로세라믹히터로적용하기위한많은연구가진행되고있다. 그러나 W 전극과코디어라이트시트를동시소성할경우, 이종간의수축률차이로인하여시트가휘는 warpage 현상이발생하여히터의물성과발열특성이저하되는문제점이있다. 본연구에서는코디어라이트시트의수축률제어를위하여분산을최적화시킨코디어라이트슬러리에유기물함량에따른시트의충진밀도를비교분석하여 warpage 를확인하였다. 그결과, 유기물함량이 42 Vol% 일경우 μm의 warpage가나타났으며, 33 Vol% 일경우 μm로최소화되는것을확인하였다. P2-G1-14 Effect of Thermal and Mechanical Properties of Ceramics on the Taper PhenomenonI Induced by Nanosecond Pulse Laser 나노초펄스레이저를이용한미세홀가공에서세라믹의열적, 기계적물성이테이퍼현상에미치는영향임진현 1*, 김시연 2, 여동훈 3, 신효순 3, 정대용 1. 1 인하대학교, 2 고려대학교, 3 한국세라믹기술원반도체산업의발달에따라반도체검사용장비인프로브카드에대한수요가증가하고있다. 특히, 프로브카드의핵심부품인세라믹가이드플레이트는반도체칩이소형화되고고집적화됨에따라홀크기와피치가점점작아져미세홀가공에대한필요성이증가하고있다. 따라서비접촉식으로정밀한가공을구현할수있는레이저를이용한미세홀가공에대한연구가활발히진행되고있다. 그러나레이저가공은열영향으로인한문제점과상부홀과하부홀의크기편차가나타나는테이퍼현상으로인하여기판가공에많은어려움을겪고있다. 본연구에서는알루미나기판과무수축기판상에나노초펄스레이저를이용한미세홀가공을통해두기판의가공특성을비교해봄으로써미세홀가공에영향을미치는임계가공펄스에너지와세라믹의밀도, 열적특성등의상관관계를규명하였다. P2-G1-15 Study of the Properties of Thermally Conductive Molding compounds by Combining Inorganic Filler 무기필러복합화에따른열전도성몰딩소재의물성연구정혜진 *, 박성대, 양현승. 전자부품연구원전기자동차의전력변환효율증가및경량화를통한연비향상을위해각모듈의성능개선에중요한역할을하는고방열몰딩소재의중요성이커지고있다. 고방열몰딩소재제작을위해서는매트릭스수지내열전도성무기입자의분산성제어를통해무기입자사용량을감소시키고몰딩소재의레올로지 (ex : 점도 ) 및열전도도특성 한국세라믹학회 153

164 2018 년한국세라믹학회춘계연구발표회 을향상시켜야한다. 본연구에서는내열성, 내전압특성을가지고있는실리콘수지에세라믹무기입자를복합화함으로써고방열절연몰딩소재제작을하였고, 고방열세라믹무기입자로는높은열전도도, 절연특성및가격경쟁력을가지고있는알루미나 (Al 2 O 3 ) 와산화마그네슘 (MgO) 을사용하였다. 특히, 실리콘수지내입자의분산성및레올로지개선을위해서다양한실란화합물을이용한무기입자의표면처리공정을진행하였다. 열전도도극대화를위해서, 다양한사이즈 (90, 45, 32, 10 um) 의무기입자를복합함으로써 Bi-modal, Tri-modal 네트워크형성을진행하였고, 56 vol% 의무기입자를복합했을때, 1.5 W/mK 이상급의몰딩소재를제작할수있었다. P2-G1-16 Quantum Dots Decorated-TiO 2 Nanostructures for Efficient Solar Seawater-splitting 양자점을이용한이산화티타늄나노구조의태양광해수분해효율증가이상우 *, 윤철민, 이준봉, 이호진, 조아영, 최택집. 세종대학교 Various transition metal oxides with nanostructures, such as nanosheets, nanowires and nanotube have been used as the photoanode materials to enhance a large active surface area for electrochemical reactions. Such a nanomaterials facilitates charge transport and reduces recombination of photogenerated carriers. However, TiO 2 nanostructures have still been limited visible light absorption due to large band-gap. In this work, we have successfully fabricated quantum dot decorated-tio 2 nanotube (QD-TNT) prepared by anodization as active photoanode for seawater splitting. By combing a fast charge transport path along nanotube and enhanced light absorption, photoelectrochemical performance of QD-TNT in real seawater electrolyte has been significantly improved Its photocurrent density reached up to 1.93 ma/cm 2, which is much larger than that of TNT. In addition, we have studied stability of QD- TNT in alkali solutions. P2-G1-17 Inducing Multiferroic Properties in Psudo-cubic Nickel Ferrite Through a Forced Oxygen Deficiency 국부결함을통한니켈페라이트세라믹재료에서의다강체특성유도조재현 1*, Haribabu Palneedi 2, 류정호 3, 조욱 1. 1 울산과학기술원, 2 재료연구소, 3 영남대학교 Ferrites have attracted considerable attention because of their interesting magnetic and electrical properties with chemical and thermal stabilities. Among these ferrites is the nickel ferrite (NiFe 2 O 4, NFO), which has extensively studied recently in a variety of applications such as spintronics, gas sensors, lithium ion batteries, and magnetostrictive devices. The NFO is basically an inverse spinel, in which the magnetic moment of Fe 3+ ions residing in the tetrahedral sites are canceled out completely by that of the Fe 3+ of the equal amount in the octahedral sites. This means that the magnetic moment of NFO comes solely from Ni 2+ ions in the octahedral sites. Therefore, many studies have been performed to disturb the given situation. The most common practice has been to fill up the remaining tetrahedral sites with foreign ions of a different magnetic moment. Here we present a new way to achieve the goal at a more fundamental level by introducing non-stoichiometry into the system, especially by generating oxygen deficiency. The results and discussion on the current work will be presented. P2-G1-18 Fast Growth of GdBCO Superconducting Film Prepared by Fluorine-Free MOD Process 불소없는유기금속증착법으로제조한 GdBCO 초전도박막의빠른성장채수진 *, 유상임, 박인성. 서울대학교 Metal organic deposition (MOD) process is known as a cost-effective non-vacuum technique which can produce high performance REBCO CCs. The conventional TFA-MOD method produces the HF gas which is not only time-taking but also environmentally harmful. Thus, in this study, we tried to fabricate GdBCO films with Fluorine-Free MOD process, and focus on optimizing calcination conditions to get high density amorphous films after the first heat treatment. The propionate-based coating solution was prepared using fluorine-free Gd, Ba, Cu precursors, and it was coated on the SrTiO 3 (001), and LaAlO 3 (001) single crystal substrates by the spin-coating method. As-coated films were calcined at the two step temperature zone. first, stay 1 h at 200 o C in Ar/O 2 atmosphere and then up to 500 o C in 10 5 mtorr dry atmosphere. Finally, as-calcined films were fired at over 800 o C in the oxygen pressure of 150 mtorr within 2min to fabricate GdBCO films. This process was performed in a reel-to-reel furnace to investigate a fast conversion from amorphous as-calcined film to GdBCO crystalline film. The growth rate of GdBCO film could be greatly improved by this method. Details will be presented for a discussion. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No ). Part of this study has been performed using facilities at IBS center for Correlated Electron Systems, Seoul National University. P2-G1-19 Nitrification and Sintering Condition Effect on High Temperature Electrical Conductivity of Y 2 O 3 - and TiO 2 -Doped AlN Ceramics Y 2 O 3 - 및 TiO 2 - 첨가계 AlN 세라믹스의고온전기전도도에대한질화및소결조건의영향이은실 1*, 김종영 2, 심우영 1. 1 연세대학교, 2 한국세라믹기술원 Recently, as more semiconductor manufacturing processes have come to require high-resolution lithography, even at high temperatures, there is an increasing need for a ceramic material that can maintain electrostatic force even at high temperatures. Hence, a material that can maintain the electric resistance (> 10 8 Ω cm at 500 o C) and have a high dielectric constant at high temperatures is needed. In this work, urea (CO(NH 2 ) 2 ) and TiO 2 were added to AlN, then the microstructural differences according to additives and sintering conditions and the electrical conductivity of AlN ceramics were investigated. When the urea is added to the AlN matrix, the urea reacts directly with the impurity of Al 2 O 3 to convert it to AlN, or the ammonia which is formed due to the decomposition of urea at high temperatures, may cause the nitrification reaction. The reduced Al 2 O 3 content decreases Al vacancies, which are the main carriers, and decreases species with positive charge. It is expected that the 154 한국세라믹학회

165 포스터발표 II activation energy (Ea) will decrease when the nitrification reaction occurs because species, which can be paired with the Al vacancies, decrease. Actually, the calculated Ea of urea added AlN is lower than that of urea-free AlN and as the urea content increases, the Ea decreases. The reduced Ea hinders a sharp decrease in volume resistance at high temperatures. As a result, we can synthesize AlN ceramics with high density and high volume resistance at high temperatures by nitrification using urea as an additive. P2-G1-20 Effect of BaHfO 3 Dopant on the Superconducting Properties of EuBa 2 Cu 3 O 7-δ Films Fabricated by Pulsed Laser Deposition 펄스레이저증착법으로제조된 EuBa 2 Cu 3 O 7-δ 박막의초전도특성에 BaHfO 3 도펀트가미치는영향박유진 *, 오원재, 유상임. 서울대학교 We report the superconducting properties of BaHfO 3 (BHO)-doped EuBa 2 Cu 3 O 7-δ (EuBCO) films fabricated on CeO 2 -buffered MgO (100) single crystal substrates by Pulsed Laser Deposition (PLD). BHO-doped EuBCO coated conductors (CCs) have been reported as a promising candidate for the next generation superconducting wire, since their critical current densities (J c ) are superior to that of BHOdoped GdBCO CCs with increasing the thickness up to ~ 3.6 μm. However, the effect of BHO dopant on the superconducting properties of the EuBCO film has never been fully clarified yet. Thus, in this work, we tried to optimize the BHO doping content in the EuBCO film, based on the results of measuring the critical temperature (T c ) and flux pinning properties. For this purpose, Various EuBCO films with x mol % BHO dopant (x = 0, 2.5, 3.5, 5, 7.5 and 10) were fabricated using the EuBCO + BHO mixed target. Samples were characterized by X-ray diffraction (XRD), Field Emission-scanning Electron Microscopy (FE-SEM), R-T measurement system, and Magnetic Property Measurement System (MPMS). Details will be presented for a discussion. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No ). And Part of this study has been performed using facilities at IBS Center for Correlated Electron Systems, Seoul National University. P2-G1-21 Effects of Sintering Conditions on the Electrical Conductivity of Y 2 O 3 and MgO Doped AlN Ceramics Y 2 O 3 를첨가계 AlN의소결조건과 MgO 도핑에따른전기전도도의영향유동수 1*, 김종영 1, 이은실 2. 1 한국세라믹기술원, 2 연세대학교 High temperature electrical conductivity of Aluminum Nitride (AlN) ceramics sintered with Y 2 O 3 as a sintering aid has been investigated with respect to various sintering conditions and MgO-dopant. When magnesium oxide is added as a dopant, spinel phases are formed as second phases, which affects the electrical properties. The effect leads to reduction of activation energy and increased electrical resistivity. This is a result of removal of some Al 2 O 3 impurity that makes carrier decrease. When the sintering temperature decreases, grain growth was reduced, which leads to a reduction of activation energy and increased electrical resistivity. P2-G1-22 Growth of 0.96(K 0.48 Na 0.52 )(Nb 0.95 Sb 0.05 )O Bi 0.5- (Na 0.82 K 0.18 ) 0.5 ZrO 3 Lead-Free Piezoelectric Single Crystal by Solid State Single Crystal Growth 고체단결정성장법을이용하여 0.96(K 0.48 Na 0.52 )(Nb 0.95 Sb 0.05 )O Bi 0.5 (Na 0.82 K 0.18 ) 0.5 ZrO 3 ( 리드를포함되지않는압전재료 ) 의성장에대해연구 M. Meng, T. L. Pham, J. S. Lee and J. G. Fisher *. Chonnam National University, Korea Ceramics based on (K 0.5 Na 0.5 )NbO 3 with a merged rhombohedraltetragonal phase transition are receiving extensive study as lead-free replacements for Pb(Zr,Ti)O3 piezoceramics [1, 2]. It is expected that the piezoelectrical properties can be improved further by using single crystals; however, these materials tend to have complex compositions, making growth of single crystals difficult. In this work, the growth of single crystals of 0.96(K 0.48 Na 0.52 )(Nb 0.95 Sb 0.05 )O Bi 0.5 (Na 0.82 K 0.18 ) 0.5 ZrO 3 using the solid state single crystal growth technique is described. In this technique, ceramic powders are prepared by the mixed oxide method. Seed crystals of KTaO 3 are buried in the powders and pressed into pellets. The pellets are sintered and single crystals of the ceramic powder composition grow onto the seed crystals. This technique is suitable for the growth of single crystals of complex composition because it does not involve melting and resolidification of the batch materials. The microstructure of the grown single crystals and surrounding matrix grains is examined using scanning electron microscopy. Chemical composition is examined using energy dispersive spectroscopy. The structure and phase transitions of the single crystals is studied using microraman scattering. The dielectric and ferroelectric properties are also measured. P2-G1-23 Effects of Dopant and Sintering Atmosphere on Sintering Behavior in Y 2 O 3 Ceramics Y 2 O 3 세라믹스의도펀트첨가및분위기에따른소결거동이지원 *, 김창훈, 이정아, 이준형, 허영우, 김정주. 경북대학교 Y 2 O 3 는높은융점과고온안정성을가지며, 내식각성과화학적안정성이우수하다. 또한적외선 (IR) 영역의파장에대한투과도가 80% 이상으로매우우수한적외선투과도를가지며가시광영역에서도 75% 이상의투과도를갖는특징이있다. 이러한특성때문에열추적, 적외선미사일유도장치보호용돔 (IR-window), 반도체장비챔버윈도우그리고고체레이저재료로응용이가능하다. 그러나소결온도가 1600 o C 이상의고온이필요하며투명한소결체를얻기위해서는 vacuum sintering, SPS sintering 및 HIP과같은고온고압의공정이요구된다. 본실험에서는난결성인 Y 2 O 3 의높은소결온도를낮추기위해다양한도펀트를단독 doping 및 co-doping 을하였으며소결온도와소결분위기를조절하였을때의소결거동과미세구조변화를 TMA, XRD 및 FE-SEM 등을통하여관찰하였다. P2-G1-24 Thermoelectric Properties of Bi 2 Se x Te (3-x) n-type Thermoelectric Material with Se Content by Rapid Sintering Process Rapid Sintering 공정으로제조한 Bi 2 Se x Te (3-x) n-type 열전소재의 Se 함유량에따른열전특성이창현 1*, 신효순 2, 여동훈 2, 남산 1. 1 고려대학교, 2 한국세라믹기술원 한국세라믹학회 155

166 2018 년한국세라믹학회춘계연구발표회 친환경소자인열전소자는버려지는열에너지를전기에너지로또는전기에너지를열에너지로전환시켜주는소자이다. 대표적열전소재인 Bi 2 Te 3 는주로 zone melting 법을이용하여단결정잉곳으로성장시킨후소재의크기에맞게절단하는공정을거쳐제조된다. 이러한제조공정및가공과정에서재료손실율이약 65% 이상으로매우크며, 기계가공에따른불량발생율또한높다. 이러한문제를해결하기위하여원료 powder 를합성하고이를이용하여소결함으로써가공손실과불량율을획기적으로줄이기위한연구가많이이루어져왔다. 하지만 Bi-Te 계열전소재 powder 는상압소결로를이용하여소결시밀도가 90% 이하로치밀화가충분히이루어지지않는문제가있다. 이러한문제를해결하기위하여 SPS (Spark Plasma Sintering) 법, hot press 법등많은연구가이루어져왔지만양산에적용하기에는공정비용이상대적으로비싸고후가공비용이높다는단점을갖는다. 따라서본연구에서는 n-type Bi-Te 계열전소재인 Bi 2 Se x Te (3-x) powder 를 mechanochemical 법으로합성후일축가압성형법으로 bulk 를제조하였다. 위의방법으로제조한 bulk 를양산을고려한 rapid sintering process 법으로환원분위기에서소결하여고밀도의열전소재를제조하고자하였다. 또한제조한 Bi 2 Se x Te (3-x) bulk 의 selenium 치환량에따른열전특성을평가하기위하여열전도도, 전기전도도및 seebeck coefficient 를측정한후 ZT, power factor 등의변화를관찰하고자하였다. P2-G1-25 Electrical and Structural Characteristics of ZnO:Al,P thin films by RF-Magnetron Sputtering RF-magnetron sputtering법으로증착한 ZnO:Al,P 박막의전기적및구조적특성신승학 *, 이정아, 이준형, 허영우, 김정주, 이상욱. 경북대학교투명전도산화물 (Transparent Conducting Oxides:TCOs) 중가장널리알려진 ZnO는 wide bandgap (3.37 ev) 와 large excition binding energy (60 mev) 값으로인해차세대 TCO, 발광소자등의소재로각광받고있다. ZnO는전자를내어놓는 intrinsic한 defect인 Zn i, V O 로인해 n-type 특성을나타내어 p-type ZnO를제작하는데어려움이있다. 현재 p-type ZnO를제작하기위해도핑을하는방법이널리알려져있는데, 이때단일원소도핑뿐아니라억셉터의고용량을증가시키기위하여도너와억셉터를 co-doping하는방법이있다. 이러한 co-doping은 strain energy와 electrostatic energy를감소시켜 dopant 고용한계를증가시키고, 억셉터-도너-억셉터형태의 cluster를형성시켜 deep level에있는 V Zn level을낮추는역할을하게된다. 또한기판과박막사이의 strain을줄이기위하여 buffer layer 를사용하는방법또한제시되고있다. ZnO buffer layer를사용하게되면박막의 roughness가줄어들고투과도, carrier concentration 값이증가한다고보고되고있으며, ZnO buffer layer의결정성이 doped-zno에영향을준다는연구가보고되었다. 본연구에서는 RFmagnetron sputtering 법을이용하여 c-plane sapphire 기판위에다양한증착온도의 ZnO buffer layer를증착하고그위에 Al과 P를 codoping한 p-type ZnO:Al,P 박막을증착하였다. ZnO buffer layer는증착온도에따라 phi-scan와 pole-figure로분석한 orientation이달라지는것을관찰하였고이현상의원인에대하여분석하였다. 또한 buffer layer가 ZnO:Al,P 박막에미치는전기적, 구조적영향에대하여서도관찰하였다. 본실험은 ZnO buffer layer를사용하여 hall concentration이 1.18E+16인 p-type ZnO:Al,P 박막을제작하는데성공하였고, 이는 XRD, phi-scan, pole-figure, hall effect, FE-SEM을이용해분석하였다. 이러한 p-type ZnO:Al,P 박막을이용하여 p-n homojunction diode를제작하였고, 접합에대한가능성을제시할수있었다. P2-G1-26 Magnetic Properties in Cu-Ni-Zn Ferrite Thin Films by Spin-Spray Deposition 양형우 *, 이우성. 한국전자부품연구원 We report on the well-crystallized Cu-Ni-Zn ferrite thin films on flexible polyimide (PI) substrates using a spin-spray deposition method and discuss their magnetic properties. Structure analysis indicates that the crystal structure of Cu-Ni-Zn ferrite film is spinel, which also have a columnar structure normal to the surface. The Cu- Ni-Zn ferrite films exhibit high permeabilities that exceed the Snoek s limit for typical bulk ferrite. Cu-Ni-Zn ferrite films have relatively high permeability µ ~ 500 and µ ~ 1 up to 50 MHz, and is promising to be used as thin film devices such as an antennas and inductors. The spin-spray deposited Cu-Ni-Zn ferrite films exhibiting high magnetic properties at both low and high frequencies provide great opportunities for fundamental studies and novel magnetic devices. P2-G1-27 Effects of Frit Composition and Amount on the Characteristics of NTC Thermistors for Low Temperature Sintering 저온소결용 NTC 서미스터의특성에미치는 Frit 조성과양의영향구본급 *. 한밭대학교 In order to study the NTC thermistor that can be fired at low temperature co-firing, the influence composition and amounts of the lead free glass frit on the electrical properties of the NTC thermistor of Mn 1.85 Ni 0.25 Co 0.9 O 4 basic composition was studied. The larger the amount of frit added, the more compact the sintered body and the higher the shrinkage rate. The densities of the sintered bodies were high when frit with low softening temperature was used. As the amount of frit increased, the electrical resistivity and B constant were increased. The sintering characteristics of the specimen sintered at 1000 o C with 10 wt% frit added to the basic NTC composition were similar to those of the specimen sintered at 1200 o C without frit. When 10 wt% of frit with low softening temperature was added and sintered at 1000 o C, the resistivity and B constant of NTC thermistor were similar to those of NTC thermistor sintered at normal temperature. P2-S11-1 Investigation of Dielectric Properties of 2D Single Layer Dielectric Nanosheet 2차원유전체단결정나노시트의유전특성임해나 1*, 류소연 1,2, 성영은 3, 최지원 1. 1 한국과학기술연구원, 2 고려대학교, 3 서울대학교 The searching for new two-dimentional (2D) materials and organization of them become a very important issue with the development of nanoscale devices. 2D Dion-Jacobson phase nanosheets have attracted attention as high-k dielectric materials which show the great dielectric properties even for thickness down to 20 nm. Generally, the dielectric properties of 2D dielectric nanosheets are measured as few layer stacked films to avoid leakage path. Therefore, the dielectric properties of the single nanosheet, which is a very important to understand the material, are rarely investigated so far. Here, we demonstrate the properties of single perovskites Bisubstituted Sr 2 Nb 3 O 10 nanosheet. The monolayer of dielectric nanosheets is deposited by Langmuir-Blodgett method and the top electrode is deposited using in-situ electrode fabrication technique. 156 한국세라믹학회

167 포스터발표 II We estimate the leakage current density and dielectric properties according to the layer. P2-S11-2 Energy Storage Properties of Bi 1.5 Zn 1.0 Nb 1.5 O 7 Thick Films Prepared on Flexible Metal Foil by Aerosol Deposition Method 유연한기판위에증착된나노결정립의 Bi 1.5 ZnNb 1.5 O 7 후막의에너지저장특성김진우 1*, 임지호 1, 김승현 2, 구창영 3, 류정호 4, 정대용 1. 1 인하대학교, 2 Brown University, 3 퀸테스, 4 영남대학교 In this study, Bi 1.5 Zn 1.0 Nb 1.5 O 7 (BZN) thick films were prepared on flexible metal substrates for flexible energy storage capacitor. Dense BZN thick films with thickness of 6~10 µ m were deposited at room temperature by aerosol deposition method. They were annealed at various annealing condition (400, 500 and 600 o C for 2 h) and their energy storage properties were measured. As a result, the BZN films annealed at 400 o C showed the highest discharged energy density (8.87 J/cm 3 ) at 1400 kv/cm. The relative permittivity, which is measured with low electric field, was stable up to 250 o C, and the discharged energy density, which is measured with high electric field, was stable up to 125 o C. P2-S11-3 Characteristics of KCa 2(1-x) A 2x B n-3 Nb n O 13 Nanosheets by Soft Chemical Method 소프트케미컬법에의한 KCa 2(1-x) A 2x B n-3 Nb n O 13 나노시트의특성류소연 1,2*, 남산 2, 최지원 1. 1 한국과학기술연구원, 2 고려대학교 Two-dimensional (2D) materials have attracted attention due to their unique properties. 2D nanosheets with atomic or molecular thickness and infinite planar lengths have been emerging as important new materials. In particular, nanosheet-based 2D materials are being applied in various fields such as all nanosheet FETs, spinelectronic devices, photocatalyst, etc. Among a variety of oxide nanosheets, those derived from layered perovskites are intriguing due to their high flexibility in terms of composition and structure and their rich pool of useful properties. Moreover, it is well known that perovskite nanosheet are strongly influenced by composition. KCa 2 B n-3 Nb n O 3n+1 is one of the prominent structural features of layered perovskites. A series of 2D niobate nanosheets with a thickness control were synthesized by chemically delaminating precursory layered perovskites into their unilamellar layers. In this work, we investigated dielectric properties and characteristics of KCa 2(1-x) A 2x B n-3 Nb n O 3n+1 (KCABNO x = 0~0.1, n = 3~4)) and acid-treated KCABNO (HCABNO). The compositional dependence behavior of KCABNO and HCANNO were analyzed through Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Atomic Force Microscope (AFM) and dielectric properties. P2-S11-4 Growth of Pore-less BaTiO 3 Single Crystal by Solid State Reaction 고상소결법을이용한기공없는 BaTiO 3 결정성장법이승희 *, 정대용, 임지호, 박춘길. 인하대학교 BaTiO 3 single crystals were grown from the dense ceramics made by Aerosol deposition method, using Solid State Single Crystal Growth method. [100] or [110] oriented SrTiO 3 seed crystals were adapted for grain growth. Solid State Single Crystal Growth (SSCG) has been intensively studied due to the low cost and compositional variations. However, the SSCG method also has some disadvantages, for instant, pores are trapped inside the single crystal. Pores are usually from the pores in ceramics for grain growth. Using Aerosol Deposition Method, BaTiO 3 powder was deposited on SrTiO 3 seed crystals. The film that has highly dense structure, no micro cracks or pores was made by AD Method. Then the film was annealed at 900 o C to 1500 o C for single crystals without pores to grow on the seeds. X-ray diffraction analysis shows that the single crystals was grown following the seed directions. Scanning electron microscopy (SEM) micrograph revealed that grain growth behavior depended on annealing temperature and heating rate. We confirmed that pore-less single crystal can be fabricated by AD Method. P2-S11-5 The Properties of M-doped SnO 2 /Ag/M-doped SnO 2 Multilayer Structure Deposited on PET Substrate for Flexible Display 플렉시블디스플레이용 PET 기판위에증착된 M 도핑 SnO 2 /Ag/ M 도핑 SnO 2 다층구조의특성장주희 *, 최지원. 한국과학기술연구원 There is increasing attention to improving transparent conductive electrodes for next generation displays that are being developed for energy and electronics. The advanced devices require new electrodes with lower resistivity and higher transmittance previously achieved. The oxide-metal-oxide (OMO) multilayer structure has been studied because it can be obtained low resistivity, high transmittance as well as flexibility. The oxide layer in OMO multilayer is important factor due to obtaining high transmittance by anti-reflective effect and protecting metal layer from oxidation. In addition, it assists to obtain thin and smooth metal layer. As a oxide layer, SnO 2 based film has been researched because is inexpensive and has wide band gap (3.6 ev). In this work, we fabricated OMO multilayer using M-doped SnO 2 optimized by CCS method. Then Electrical and optical properties of M-doped SnO 2 /Ag/M-doped SnO 2 deposited on PET were measured by 4 point probe and UV-Visible-spectrometer, respectively. P2-S11-6 Low-Temperature Synthesis of Nano-sized BaTiO 3 Powders by Microwave Heat-treatment with Solid State Reaction 마이크로웨이브고상합성법을이용한저온에서의 BaTiO 3 나노분말합성윤병규 *, 장내형, 윤한솔, 조남희. 인하대학교 BaTiO 3 는페로브스카이트구조의강유전체재료로써, Multilayer ceramic capacitor, piezoelectric devices 등과같은전자디바이스에광범위하게쓰이고있다. 특히, 나노소자를염두에두고고상합성법, 졸-겔법, 수열합성법등의방법으로나노미터크기를갖는 BaTiO 3 나노분말제조방법에관한연구가주목받고있다. 그중고상합성법은공정이간단하고대량생산에유리한장점이있지만높은공정온도와긴공정시간이필요하여나노미터크기의분말을만드는데한계가있다. 기존의고상합성법의한계를극복하고자, 본연구는마이크로웨이브하에서초기원료물질의분극성작용기유무에따라 BaTiO 3 결정생성과성장에미치는영향을조사하였다. 합성된 BaTiO 3 분말및초기원료의결정상과구조적변화를파악하기위해 X-ray diffraction (XRD; Rigaku, Multiflex 3 kw) Fourier transform Raman (FT- 한국세라믹학회 157

168 2018 년한국세라믹학회춘계연구발표회 Raman; Bruker, RFS-100/S) 을이용하였고합성된분말의입경및입도분포를조사하기위하여고분해능주사전자현미경 (HR-SEM; Hitachi, SU-8010) 을활용하였다. 실험결과분극성작용기가있는원료물질을사용할경우공정온도 100 o C 에서 BaTiO 3 결정이형성되는것이관찰되었다. 이는기존고상합성법의공정온도보다 ~500 o C 낮은온도이다. 본발표에서는마이크로파가열기법을활용해제조된 BaTiO 3 특성을고찰하고, 특히초기원료의분극성작용기유무에따라마이크로파가열과정에서 BaTiO 3 합성에미치는영향을기존의고상합성방법과비교하여결과를발표하고자한다. P2-S11-7 Enhancement of Piezoelectric Properties by the Growth of 0.8(Na 1/2 Bi 1/2 )TiO 3-0.2(Sr 0.7 Ca 0.3 )TiO 3 Single Crystal by the Solid State Crystal Growth technique 단결정성장기술을할용하여단결정성잔시킨 0.8(Na 1/2 Bi 1/2 )TiO 3-0.2(Sr 0.7 Ca 0.3 )TiO 3 Si를이용한압전특성항상 Le Gia Phan *. Chonnam National University The work current In, single crystals of 0.8(Na 1/2 Bi 1/2 )TiO 3-0.2(Sr 0.7 Ca 0.3 )TiO 3 were successfully fabricated by the Solid State Crystal Growth (SSCG) technique. Single crystals were grown on both [110] and [001] - oriented SrTiO 3 seed crystals. The relative permittivity vs.. The temperature curves of the crystals showed relaxor ferroelectric behavior, a rhombohedral to tetragonal phase transition temperature of ~ 155 C and a relative permittivity of maximum temperature of ~ 300 C. The ferroelectric and piezoelectric properties of a single crystal exhibit a significant improvement in polarization hysteresis loop and strain magnitude compared to a ceramic sample. Normalized A strain in the single crystal of 374 pm /V at 5 kv/mm showed an increase of 54.5% in the single crystal sample as compared to the polycrystalline sample. P2-S11-8 Effect of 2-d Mica Nanosheets on the Formation of Polar Phase in Poly(vinylidene fluoride) 2차원마이카나노시트의 Poly(vinylidene fluoride) 극상형성에대한효과고유민 *, 신회섭, 조현승, 배현정, 권도균. 한국항공대학교 As development of hybrid or electric vehicles industry increases the interest about polymer capacitors has been raised. Currently commercially available polymer capacitors based on polypropylene (PP) have excellent breakdown strength, low energy density and low dielectric permittivity. To improve its disadvantages like energy density, studies have been conducted to replace PP with ferroelectric polymer poly(vinylidene fluoride) (PVDF). Since it is difficult to form and maintain polar phases of PVDF, in this study, exfoliated mica nanosheets are introduced to enhance breakdown strength and the formation of polar phases of PVDF. It is confirmed that mica in PVDF affects strengthening of b-phase and g-phase and weakening of a- phase because of hydrogen bonding between hydroxyl groups of mica and -CF 2 groups of PVDF molecules. The enhanced formation of polar phases was observed using X-ray diffraction spectroscopy (XRD), fourier-transform infrared spectroscopy (FT-IR). Also, dielectric permittivity and P-E loops of the nanocomposites were measured in wide frequency range. P2-S11-9 Low Temperature Sintering of BNT-ST-BF Lead-free Piezoelectric Ceramics BNT-ST-BF 무연압전세라믹스의저온소성연구이재신 *, 이창헌, 김성현, 한형수. 울산대학교 (Bi 1/2 Na 1/2 )TiO 3 SrTiO 3 ( BNT-ST) 는저전계에서변형특성이다른무연계압전소재에비해서뛰어나다. 하지만 BNT-ST 계무연압전소재는현재까지많은연구가진행되지않은상태이다. 본연구에서는 CuO가 0.01 mol 과잉첨가된 (Bi 1/2 Na 1/2 )TiO 3 SrTiO 3 BiFeO 3 (BNT-ST-BF) 세라믹스의유전및압전특성을살펴보았다. 치밀한세라믹시료를얻기위해서는 1175 o C 이상의소결온도가요구되었으나, CuO를미량첨가하면 1000 o C에서도충분한소성밀도를얻을수있었다. 반면에 CuO를첨가함에따라완화형강유전성이더안정화되어정규-완화형강유전체전이점이저온으로이동하였고, 압전전하상수 d 33 값도저하되었다. 그러나전계유기변형특성은향상되어액추에이터분야의응용가능성을보였다. P2-S11-10 Effects of A/B-site Modification on the Electrical Properties and Conduction Mechanism of Nonstoichiometric BiFeO 3 Ceramics BiFeO 3 세라믹스의 A/B자리치환에대한전도메커니즘및전기적특성김준찬 *, 박철민, 우정욱, 백승봉, 이순일, 송태권, 김원정, 김명호. 창원대학교 A/B-site modification in bismuth ferrite (BiFeO 3, BFO) is expected to exhibit interesting ferroelectric and conduction properties. In this work, aliovalent cations modifications were carried out in order to improve the structural, dielectric and high-temperature conduction performance of the materials. The polarization response and dielectric properties were improved by the addition of small amount of A/B-site cations (Ba 2+ /Ti 4+ ) and optimal amount of Bi 2 O 3 in BFO ceramics. To better understand the effects of defects, the electrical conductivity was investigated under various oxygen partial pressures (po 2 ) at high temperatures. P2-S11-11 Study on Physical Modeling of BaTiO 3 Thin Films for High Performance Humidity Sensor via High Speed Powder Spray Process 고속분말분사공정으로제작한고성능 BaTiO 3 감습막의물리적모델연구김익수 *, 조명연, 김원중, Jun-Ge Liang, 김은성, 김남영, 오종민. 광운대학교최근들어습도변화에민감한산업기술, 기상, 의료, 환경등사회전반에걸친다방면에서기존보다더정밀하고신뢰성있는습도센서가요구되고있다. 이로인해감지범위가넓고빠른응답성과높은내구성을가진세라믹감습막기반정전용량형습도센서가주목받고있다. 하지만, 일반적인세라믹감습막제작공정은고열처리공정이필수적이며, 열처리를이용한공정은세라믹필름내부조성의변화를일으킬뿐만아니라공정이복잡하다는단점이있다. 따라서, 본연구에서는상온저진공에서고속으로세라믹코팅이가능한 Aerosol deposition (AD) 공정을응용하고, 감습재로서탁월한 perovskite 구조를가진강유전체BaTiO 3 필름을제작하였다. 또한, 저온에서열처리한 BaTiO 3 필름의습도에따른정전용량변화, 응답속도, 회복속도및노화시험에대하여조사하였으며, AD공정으로제작한필름의특별한내부구조의관찰로부터 BaTiO 3 감습막의물리적모델제시하였다. 158 한국세라믹학회

169 포스터발표 II P2-G2-1 Stable Li Ion Batteries Anode by Inducing the Covalent Bond between the Active Materials and Binder by Esterification Reaction Poly acrylic acid (PAA) 바인더와실리콘의에스터 (Ester) 반응을활용한수명특성이우수한리튬이온배터리음극재제조방법정철호 *, 홍성현. 서울대학교 Recently, the emergence of electrical vehicles has driven the intensive researches on Lithium-ion batteries that exhibit higher energy density with a long term cyclability. While silicon has been recognized as a promising anode candidate due to its high theoretical capacity and low discharge potential, its poor cyclability caused by tremendous volume change during cycling inhibits the Si from being commercially used. Although various nanostructures or introduction of secondary phase layer has been realized as a method to achieve the high-performance Si anodes, it requires complex reactions and involves hazardous reagents, which eventually result in cost and barrier to scale up. Herein, we demonstrate that stable LIBs Si anode with a high reversible capacity of over 1500 mah g 1 after 500 cycles at a current density of 1000 ma g 1, can be manufactured by inducing the covalent bond with the binder and commercial Si utilizing the esterification reaction. Mechanically robust covalent bond between binder and Si can effectively prevent the binder from susceptibly slide upon the continual volume change of the Si during cycling, which eventually results in superior cyclic performance. P2-G2-2 Tailored Porous ZnCo 2 O 4 Nanofibrous Electrocatalysts for Lithium-Oxygen Batteries 리튬-공기전지용다공성 ZnCo 2 O 4 나노섬유전기촉매소재개발김재찬 *, 이광희, 오승익, 김동완. 고려대학교 Spinel 구조소재는산소발생 / 환원반응활성을가지고있어리튬- 공기전지촉매소재로많은주목을받고있다. 최근, tetraheral site 에존재하는양이온이치환된형태의 spinel 구조중 ZnCo 2 O 4 소재는높은촉매활성, 친환경적, 가격경쟁력등의장점을가지고있어각광받고있으나낮은사이클안전성과높은과전압등에대한추가적인연구가필요하다. 1차원나노구조화는이러한소재의문제점을해결할수있는방법으로효율적인전자이동통로를제공하고높은비표면적으로촉매효율향상에효과적이지만현재까지 1 차원나노구조 ZnCo 2 O 4 소재를리튬-공기전지에적용한연구는보고되지않았다. 본연구에서는전기방사를통해 ZnCo 2 O 4 나노섬유를합성하고이를리튬-공기이차전지촉매소재로적용했으며또한추가 Zn 이온첨가를통해 ZnO/ZnCo 2 O 4 나노섬유구조를만든후 selective etching을통해다공성 ZnCo 2 O 4 나노섬유를합성해리튬- 공기전지산소극촉매소재에적용했다. 합성된다공성 ZnCo 2 O 4 나노섬유는미세구조분석결과평균 260 nm 의직경을가지고있는 1 차원나노구조를가지고있었으며 ZnO 가 etching된위치에 pore를형성하고있었다. 다공성 ZnCo 2 O 4 나노섬유는리튬-공기이차전지산소극으로제조하여전기화학평가를진행한결과 ( 용량제한 : 1000 mah/g, 전류밀도 : 500 ma/g) 226 cycle 의사이클안정성을나타냈다. 이와같은다공성 ZnCo 2 O 4 나노섬유의촉매특성은다공성 1차원나노구조와높은비표면적으로많은횟수에충 / 방전에도 active site를유지했기때문인것으로판단된다. P2-G2-3 Synthesis of LiMn 2 O 4 Nanowires by Hydrothermal Process followed by Solid State Reaction 수열합성과고상합성법에의한 LiMn 2 O 4 나노와이어의합성 김태중 *, 김학연, 양재형, 김용선. 인하대학교 Spinel LiMn 2 O 4 (LMO) cathode material has been attractive in the field of lithium ion batteries (LIBs) because of its low cost, high power, safety and environmental friendliness. In this study, manganese oxide (MnO 2 ) nanowires were synthesized by hydrothermal process, which were mixed with LiOH H 2 O and calcined at o C to synthesize spinel LMO nanowires. The crystal structures and morphologies of the MnO 2 precursor and LMO were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the electrochemical properties were analyzed by galvanostatic measurements. Perfect crystal of LMO was not be synthesized when the calcination temperature was below 700 o C, while the nanowire structures could not be maintained above 700 o C due to sintering of the particles at high temperatures. The results indicate that the nanowireshaped LiMn 2 O 4 with reasonable electrochemical performance can be obtained only in a narrow temperature range of solid state reaction near 700 o C. P2-G2-4 Photocatalytic Properties of Surface Treatment of Low Temperature Synthesized 1 Dimensional Titanium Dioxide Nanofibers 저온합성된 1차원티타늄옥사이드나노섬유의표면처리및광촉매특성평가송찬근 1,2*, 윤종원 1, 윤형중 2, 원종한 2. 1 단국대학교, 2 기초과학지원연구원 Electrospinning is one of simple methods for generating oxide semiconductor nanofibers by combination with the sol-gel process. However, it is well known most of the experiments using the electrospinning require more than 500 C heat treatment. In this study, TiO 2 nanofibers were fabricated by the sol-gel process and the electrospinning method. These nanofibers made of heat-treated at a relatively low temperature of 280 C. Also these nanofibers were subjected to UV treatment or plasma treatment. Crystalline phase, surface morphology, micro structure properties and surface chemical states of fabricated nanofibers were characterized by XRD, SEM, TEM and XPS, respectively. According to XRD results, nanofibers were composed of the anatase and rutile mixed phase at the calcination temperature of 280 C. These TiO 2 nanofibers average diameter were about 250 nm and it is consisted of crystallites about few tens of nanometers. XPS results, it was confirmed that the residual carbon. Therefore, the residual carbon of TiO 2 nanofibers was removed by UV treatment and plasma treatment. The photocatalytic properties were evaluated by degradation of methylene blue under solar light irradiation. The photocatalytic properties of TiO 2 nanofibers were better compared to P25 powders. P2-G2-5 Ag Nanoparticles Functionalized ZnCo 2 O 4 Hollow Spheres Derived from Metal-Organic Framework for a High- Rate and Long Cycle Lithium Ion Battery Anode 금속유기구조체기반은나노입자가결착된 ZnCo 2 O 4 중공구조나노스피어를활용한고성능리튬이온전지음극소재개발구원태 *, 장혜연, 김찬훈, 정지원, 정준영, 김일두. 한국과학기술원 Huge volume expansion is always critical problem of high capacity conversion anodes for next generation lithium-ion batteries. Although extensive efforts have been devoted to controlling the volume 한국세라믹학회 159

170 2018 년한국세라믹학회춘계연구발표회 expansion using nanostructuring and surface enginieering till now, more simple and facile approaches have to be considered. Here, we report a straightforward and general synthesis of Ag nanoparticles functionalized ZnCo 2 O 4 porous hollow spheres (ZnCo 2 O HSs): (i) immobilization of metal organic frameworks (MOFs) including Zn and Co metal nodes onto polystyrene sphere templates, (ii) calcination (~450 C) for the removal of core polystyrene sphere templates and oxidation of MOFs to produce a mesoporous ZnCo 2 O 4 HSs, and (iii) a subsequent Ag mirror reaction for 10 min, resulting in the formation of ZnCo 2 O HSs. This porous hollow morphology not only effectively relieves the strain stemming from volume expansion of transition metal, but also facilitates the efficient electron transport for lithium diffusion by shortening the Li-ion diffusion path during lithiation/delithiation process. Moreover, uniformly decorated Ag nanoparticles are beneficial to formation of stable SEI layer as well as increase of electrical conductivity of ZnCo 2 O 4. The MOFs derived porous ZnCo 2 O HSs exhibited remarkably stable cycling performance (a capacity value of 616 mah g 1 after 900 cycles at a current density of 1 A g 1 ) and excellent capacity retention of 80% under very high current density of 20.0 A g 1. P2-G2-6 The Complementary Analysis of Ceramic Coating Method for High-temperature Anti-corrosion 고온내부식용세라믹코팅에대한다각적분석방정원 1*, Nguyen Minh Dat 2, 안수빈 1, 김영희 1, 권우택 1. 1 한국세라믹기술원, 2 Gyeongsang National University 부식현상은발전소, 지역난방등대규모의보일러시스템을보유한설비들에서매우중대한해결과제이다. 특히고온에서촉진되는부식현상의경우현재합금을적용해서대비하고있으나여의치않은것이실정이다. 따라서많은연구자들이고온부식현상을억제하기위한다양한재료개발및공정, 방법들에대해서연구해오고있다. 이번연구에서우리는물리적, 화학적안정성이우수한세라믹재료들을기반으로하는고온내부식용코팅소재를개발하고이를다른다양한내부식소재들과다각적으로비교및분석을진행했다. 보일러시스템의경우, 관의외부에강력한열을가해주면관내부의물이스팀이되는체계이다. 이경우관의외부의온도와내부의온도가다르게구현되는데이를위해먼저보일러시스템의온도조건을매우유사하게구현할수있는평가장치를새롭게고안했다. 이장치를통해세라믹코팅소재를비롯한각종고온내부식방법들 (silica taping, arc plasma coating and inconel overlay welding) 을 300 시간동안다양한내 / 외부온도에변화를주어고온부식환경을구현하였으며, 이를통해도출된결과들을 FE-SEM, EDS, Weight loss method 등의방법을통해다각적으로비교분석했다. 이를통해현재연구진행하고있는세라믹코팅소재에대한활용가능성을증명했으며이는발전소및대규모난방시설등의보일러체계를지니는각종현장에서유용하게적용될수있으리라판단된다. P2-G2-7 S ynthesis of Silicon/copper Composite Electrodes for Enhancing Electro-chemical Performance of Lithium Ion Battery 리튬이온배터리의전기화학적특석향상을위한금속-실리콘복합체음극재의합성권성우 *. 서울대학교 실리콘 (Si) 은가장높은이론용량을갖는리튬이온전지의음극재로써, 상용화되어있는흑연계음극재의낮은용량을대체할수있는소재로주목받고있다. 그러나실리콘은리튬이온의삽입시큰부피팽창으로인해낮은수명특성을보이고, 낮은전기전도도를보인다는문제점을갖고있다. 따라서, 실리콘음극재의리튬이온의삽입시구조를유지할수있는완충층 (buffer layer) 를제공함과동시에낮은전기전도도를개선할수있는디자인이필요하다. 3 M 과일진전기등의기업에서실리콘물질에금속합금을코팅해기존의문제점을해결할수있다고발표한바있다. 특히, 3 M 에서는기존의흑연음극재와새로운실리콘합금음극재를병용하여같은부피에서더높은용량을갖는배터리를확보하였다고발표하였다. 본연구에서는다공성실리콘과구리 (Cu) 의 composite 합성을통해실리콘합금음극재의성능향상에대하여고찰하였다. 마그네슘분말과이산화규소 (SiO 2 ) 를활용하여다공성실리콘을합성한후, 해당실리콘을졸 - 겔법또는무전해도금으로 Cu 와의 composite 을형성하였다. 마그네슘환원법으로합성한다공성실리콘은 Cu 전구체가잘흡착될수있는조건을제공할수있으며, 이를 SEM 및 TEM EDS 분석을통하여확인하였다. 본연구에서합성한실리콘 /Cu 음극재는 Cu 가완충층으로작용하여실리콘음극재의부피팽창을막을수있으며, Cu 의높은전기전도도로인해향상된전기화학적특성을얻을수있다. 그결과로 85% 이상의높은초기효율및 1000 ma/g 의전류에서 1400 mah/g, 200 사이클이상의안정적인전기화학적특성을갖는음극재를합성하였다. P2-G2-8 Growth Behavior of Silicon Carbide Crystal Film Coated with Silica Sol on Carbon Fiber Surface 탄소섬유표면에실리카졸을이용하여코팅한탄화규소결정막의성장거동안수빈 *, 방정원, 권우택. 한국세라믹기술원탄소섬유는뛰어난기계적열적특성을가져다양한분야에적용이되고있으나산화에매우취약하여사용수명에한계가있다. 이를해결하기위해다양한연구가진행되어오고있다. 본연구에서는탄소섬유의내산화특성을향상시키기위해실리카졸을이용하여표면을 SiC로코팅하여 C/SiC 복합소재를제작하였다. 열처리분위기를조절하여다양한조건에서 SiC 코팅층을탄소표면에형성시켰고, 그특성을확인였다. 코팅층의형태와결정성을 SEM, XRD 분석을통하여관찰하였고, 내산화특성은공기분위기에서무게감량을측정하는방법으로확인하였다. 열처리조건에상관없이 SiC코팅층은형성되었으나, 서로다른조건에서다양한형태와두께의결정막이형성되는것이관찰되었다. 내산화특성은기존의탄소소재와비교하여 3배에서 5배정도향상되는것이확인되었다. P2-G2-9 Graphene Oxide for Hydrogen Fuel Cells 수소연료전지용그래핀산화물 Shahjahan 1*, 박성범 2, 박용일 1. 1 금오공과대학교, 2 동국대학교 Pure grapheme oxide (GO) is good ionic conductor in humidified condition without any acidic functional group. The PEMFC application of the pure GO membrane is a great challenge due to fuel crossover, high reduction rate of oxygenated functional group during fuel cell operation at above 80 C and large carbon losses at high temperature. To overcome these drawbacks, we suggest GO-modified hydrogen membrane fuel cells (GOHMFC). Compared to the electrolyte of typical HMFCs consisting of Pd film as hydrogen permeable layer and proton-conducting perovskite oxide film, the new electrolyte for GOHMFCs has a double-layered structure consisting 160 한국세라믹학회

171 포스터발표 II of pure GO layer and hydrogen permeable alloy thin film. In this study, we report the properties of the prepared GO membranes including microstructure and surface morphology, proton conductivity, gas leakage, chemical and physical stability. P2-G2-10 Fabrication and Electrochemical Properties of Garnet Type Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Solid Eelectrolyte by Sol-gel Method Sol-gel법을이용한 Garnet형 Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 고체전해질의제조및전기화학적특성이은정 *, 정현아, 임제홍, 황해진. 인하대학교최근에너지관련연구분야는전지의재료의향상뿐만아니라시스템적으로효율성및안정성에관한연구도많이이루어지고있다. 자동차배터리뿐만아니라 ESS에서전지의사용의중요성이높아짐에따라지속적으로연구가진행중이다. 높은이온전도도로각광받는 Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) 는그동안 1300 o C 이상의온도에서시재료를용융하여제조한유리프릿을분말형태로분쇄후 garnet상으로결정화시키는과정을거쳐서만들었기때문에공정이매우복잡하였다. 하지만졸겔법을이용하여 LATP 분말을제조하면상대적으로낮은온도에서간단하고고밀도, 고결정성을가지는소결체를단시간에제조할수있었다. 본연구에서는 LATP 를합성하는경우시재료에따라서겔화가잘이루어지지않아오랜교반과복잡한반응과정을거쳐서제조하였지만, 본연구에서일반적으로알려진질산염이아닌알루미늄인산염을사용하여졸겔법으로합성한 LATP의소성온도에따른 LATP 입자크기의변화와그에따른이온전도도의측정하였다 o C에서소결한 LATP는 S/cm로높은이온전도도값을나타내었다. P2-G2-11 Development of Amorphous Oxide Electrolyte with Low Melting Point for All-solid-state Batteries 저융점비정질산화물고체전해질개발박찬휘 *, 이상수, 윤인상, 신동욱. 한양대학교친환경을위한전기자동차및에너지저장장치의수요가급증하여, 대용량의리튬이차전지의수요도지속적으로증가하고있다. 그러나기존리튬이차전지는인화성이있는액체전해질을사용하므로발화, 폭발로인한안전성문제가지속적으로제기되고있으며, 이러한문제점을해결하기위해서난연성의세라믹고체전해질을사용하는전고체전지가차세대전지의후보로부상하고있다. 고체전해질중에서도산화물계고체전해질은높은화학적안정성을기반으로전기화학적성능을확보하는것이가능한소재이며, 구조적으로는결정질계고체전해질과비정질계고체전해질로분류할수있다. 결정질계고체전해질은높은이온전도도를가지므로전지성능을높일수있다는장점을가지고있지만높은소결온도를요구하므로전극활물질의손상없이전극을형성하기어려우며밀도가낮아진다는단점을가지고있다. 반면비정질계고체전해질은낮은소결온도를가지므로고밀도의전고체전지를제조하기쉽다는특성을가지고있다. 이에본연구에서는융점을낮춰전극의형성을용이하게만드는비정질고체전해질에대한탐색을진행하였다. 비정질고체전해질의융점을낮추기위하여 glass modifier인 lithium의함량을최대한높일필요가있다. 기존의 melt-quenching 기법으로는실투가발생하는문제로인하여 40 mol% 이상으로 lithium 함량을높이기어렵다는단점을가지고있다. 이에본연구에서는기존의황화물계고체전해질합성에서사용되는방법인고에너지 mechanical milling 기법을이용하여고체전해질내부의 lithium 함량을 50 mol% 이상으로높이는연구를진행하였다. Acknowlegement: 본연구는 LG 화학의후원으로진행되었습니다. P2-G2-12 Effects of Phosphates on Flame-retardant Coatings for Electrical PVC Cables 이병우 *, 홍일곡. 한국해양대학교 Although PVC is intrinsically self-extinguishing, it supports flame spread along its length in high temperature fire. The spread of fire along electrical cables may be alleviated by applying fire-retardant coatings to the surface of the PVC cable. The flame-retardant coatings also act as fire protective barriers for electrical PVC cables. Pastes of flame-retardants compositions incorporating organic and inorganic phosphates complexes mixed in PVC-organic solvents solution were prepared and evaluated for their fire performance. The pastes were dried to form sheets. The limiting oxygen index (LOI) for the complexes was found to be fairly high. The flame-retardant coatings were applied on electrical PVC cables. Their fire performance was evaluated using standard procedures. Significantly low levels of smoke generation were observed when the coated cables were exposed to standard test conditions. The phosphates complexes used in the flame-retardant coating offer improved resistance to ignition, flame spread and smoke generation. P2-G2-13 Characterization of Yttrium Stabilized Zirconia Colloidal Dispersion by Precursor Concentration for Optical Organic-inorganic Hydrid Coating Application 광학코팅용이트리움안정화지르코니아콜로이달분산액의전구체농도에따른특성이희선 *, 임형미. 한국세라믹기술원 Yttrium stabilized zirconia is widely used for structural materials because of a number of superior properties, such as high refractive index, high hardness, chemical durability and optical transparency. Using these properties, the yttria stabilized zirconia colloidal dispersions are applied to lenses, optical devices, high refractive index material and optical and optical thin films for optical property. The high dispersion as well as high yttrium stabilized zirconia contents is one of the key factors to enhance the optical property in the hybrid coating. The high concentration of zirconium acetate may provide the high production yield. It is necessary to study the particle property and dispersibility according to the concentration of zirconium acetate by hydrothermal treatment. To confirm the dispersibility, average particle sizes of the synthesized nanoparticles were analyzed with particle size analyzer and transmission electron microscopy, crystalline phases were investigated by x-ray diffraction. Dispersibility of the nanoparticles was compared by changing the transmittance change with time using turbiscan. Furthermore, optical properties were measured for transmittance in the range of nm. P2-G2-14 Photocatalytic Activity of Al-TiO 2 Nanomaterials for the Degradation of Methylene Blue Dye Al-TiO2 나노재료의광촉매특성이득용 *, 이혜란. 대림대학교 Al-TiO 2 nanofibers and nanotubes having an Al/Ti molar ratio of 0.38 were prepared using sol-gel-derived electrospinning to investigate the effect of Al doping on the crystal structure and the photocatalytic activity of methylene blue (MB). X-ray diffraction (XRD) results 한국세라믹학회 161

172 2018 년한국세라믹학회춘계연구발표회 indicated that Al-TiO 2 nanofibers and nanotubes were composed of anatase (47%, 43%) and rutile (53%, 57%) phases, respectively. As the Al-TiO 2 nanotubes were electrospun whereas the Al-TiO 2 nanofibers were not, the Barrette-Emmett-Teller (BET) surface area and degradation kinetic constant increased dramatically from 147 m 2 / g to 151 m 2 /g and from min 1 to min 1, respectively. The Al-TiO 2 nanotubes calcined at 500 o C exhibited enhanced MB degradation (93%) compared with that of TiO 2 nanofibers (8%) due to the synergic combinations of mixed crystals, larger BET area, and Al doping. P2-G2-15 N, F Co-doped Activated Carbon for Supercapacitors 슈퍼커패시터용 N, F 공동도핑된활성탄김주연 *, 노광철. 한국세라믹기술원활성탄은활성화공정에서산소관능기를만들기때문에다른탄소물질보다전기전도도와신뢰성이낮다. 이러한문제는활성탄에헤테로원자공동도핑을하여산소작용기를감소시켜해결할수있다. 본연구에서는상업용활성탄 (AC-R) 을전구체로사용하고 ammonium tetrafluoroborate를질소및불소 (N, F) 도핑소스로이용하여 N, F 동시도핑된활성탄 (AC-NF) 을마이크로파수열합성법으로성공적으로제조하였다. AC-NF는 0.6, 0.1 at% 의 N, F 함량을가졌으며, 3.8 S cm 1 의우수한전기전도도를가진다. 전기화학테스트결과 AC-NF는전류밀도 0.5 ma cm 2 에서 14.6 F cc 1 의높은용량을가지며, 전기전도도증가로인해용량유지율 53 % 인 AC- R보다 21% 높은 74% 의우수한용량유지율을가진다. 본연구에서개발된 N, F 공동도핑방법은한개의소스로 N, F 공동도핑을하는방법으로비용적인장점을가지며, 우수한전기화학적특성을갖기때문에에너지저장장치의상업화를위한유망한방법이될거라여겨진다. P2-G2-16 Study on the Behavior of Heavy Metals in Various Condition from CFBC Coal Ash CO 2 고정화기술적용순환유동층발전회의다양한환경에서의중금속거동연구남성영 1*, 김춘식 1, 조용광 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원순환유동층발전소는저품위석탄, RDF 등의광범위한연료사용이가능하며, 약 900 o C의낮은연소로질소산화물생성을억제할수있는장점을보유하고있다. 하지만, 발생되는부산물인발전회는산화칼슘 (CaO) 이 PC 연소발전회에비해상대적으로다량함유되어있어콘크리트혼화재로사용시유리석회 (free-cao) 성분으로콘크리트의이상응결현상, 슬럼프의손실, 내구성저하등의문제를발생시킬수있다. 특히콘크리트의팽창, 균열등의문제를발생하여물성을저하시키는것으로알려져있어, 새로운재활용용도확보가필요한상황이다. 본연구에서는발전회에포함되어있는산화칼슘 (CaO) 과 CO 2 를활용하여복합탄산염물질을제조하여, 온실가스저감을통한광산채움재등의신규재활용용도개발을목적으로하였다. 금속광산의경우황화광물로인해강산성의환경이조성될수있으며, 비금속광산의경우석회석등의용해로강알칼리환경이조성될수있다. 이에발전회및 CO 2 고정화된복합탄산염재료의광산충진시장기적안정성과다양한환경에서의중금속거동을알아보기위해서 ph 조절을통해자연적인환경부터강산성, 강알칼리등의악조건에서의중금속의거동을확인하였다. 이논문은 2017 년도정부 ( 과학기술정보통신부, 환경부, 산업통상자원부 ) 의재원으로한국연구재단 - 탄소자원화국가전략프로젝트사업의지원을받아수행함. (2017M3D8A ) P2-G2-17 Highly Efficient Si-based Water Splitting Photoanode by Facile Pulsed Electrodeposition of Nickel Particles 펄스전기전착법을이용한니켈나노입자증착을통한고효율실리콘기반광전극이솔아 *, 이미경, 이태형, 장호원. 서울대학교 Converting and storing solar energy has been regarded as a promising approach to address the current global reliance on fossil fuels. Solar water splitting system requires stable light-absorbing electrodes for both the oxidative and reductive half-reactions. However, the kinetically slow oxygen evolution reaction (OER) is a bottle-neck process for producing sustainable solar-driven fuels using water. Silicon has a suitable band gap (1.12 ev) to absorb the wide range of the solar spectrum and has high carrier mobility. Since the silicon photoanode is unstable at electrolyte and suffers from fast photocorrosion due to the position of thermodynamic redox potentials, the solar to hydrogen conversion efficiency of bare silicon photoanode is largely suppressed. To solve those problems of silicon, recent studies on silicon photoanode has focused on designing a surface passivation layer that protects against chemical and photo-induced corrosion without degrading the inherent photoactive ability of silicon and promotes the chemical adsorption of water molecules to lower the overpotential at the solid/liquid interface. Herein, we report the synthesis and photoelectrochemical properties of multifunctional nickel particle on a n-type silicon photoanode synthesized by using a facile pulsed-electrodeposition, in which the coverage of nickel particles are tailored. The solution-processed n-si photoanode showed stable high catalytic behavior, leading to highly efficient photoanodes. P2-G2-18 Unuse Woody Biomass Derived Activated Carbons for Supercapacitors 미활용목질계바이오매스를이용한슈퍼커패시터용활성탄제조임건해 *, 한조아. 한국세라믹기술원국내에서발생되어폐기되고있는미활용목질계바이오매스를이용하여슈퍼커패시터용활성탄을제조하였다. 사용된목질계바이오매스는벌채부산물, 낙엽송, 혼합침엽수, 백합나무, 혼합활엽수를사용하였으며이중침엽수종 ( 낙엽송과혼합침엽수 ) 활성탄이가장우수한용량값을나타냈다. 높은비표면적확보를위해알칼리활성화를진행하였다. 비표면적을분석한결과, 목질계바이오매스 6종모두 Micropore가발달되었으며비표면적이증가함에따라전체기공부피도증가하였다. SEM과 TEM표면분석결과, 모든수종이활성화이후표면에기공이형성되었고침엽수종에서부분결정성구조가나타났는데이는전자전도도향상에기여하므로전기화학적성능향상을도모할수있다. 모든수종을충방전테스트한결과, 고온및수명특성이각각 95%, 88% 이상으로나왔고전극밀도값이모두0.5 g/cc이상으로나왔다. 결과적으로미활용목질계바이오매스들을이용하여슈퍼커패시터용활성탄으로제조할수있었고, 이를통해폐기되는자원을더효율적으로사용할수있을것으로보여진다. 162 한국세라믹학회

173 포스터발표 II P2-G2-19 Electrolytes using Ionic Liquids as Co-salts are Available for Supercapacitors Operating at High Voltages 이온성액체를 co-salt로사용한고전압용슈퍼커패시터전해액이정한 *, 권하나, 노광철. 한국세라믹기술원기존슈퍼커패시터전해액으로사용되는유기용매의낮은사용전압을극복하고자전해액에작동전압이높은 ionic liquids (ILs) 를 co-salts로사용하여 electrochemical stability potential window (ESPW) 를확장하였다. ILs를첨가함에따라전해액의안정성과이온전도도가증가했을뿐만아니라전해액의분해또한억제하는것으로나타났고, 높은전압에서전해액의안정성을증가시키는효과가있었다. 기존 1 M TEABF 4 /PC 유기전해액에 7 wt% 의 EMIBF 4 와 EMITFSI를 blending한결과 LSV 그래프에서 EMIBF 4 는 5.5 V 의 potential window를가졌으며, EMITFSI의경우 5.6 V의 potential window를확일할수있었다. 또한 co-salt로 ILs를사용한전해액으로 cycle 안정성 test를진행한결과 10,000 cycle 이후에도초기용량대비 97.5% 의용량유지율을보여안정성또한우수한것으로확인되었기에 3.7 V의고전압에서사용가능하다고보여진다. 따라서 ILs를 co-salt로사용하는것은슈퍼커패시터용전해액으로충분한가능성이있다고보여진다. P2-G2-20 Piezoelectric Nanoparticle-Based Composite Nanofibers for Energy-Harvesting 압전나노입자기반복합체나노섬유에너지하베스터김지호 *, 김승원, 최홍제, 한찬수, 김다빈, 조용수. 연세대학교 Here, the piezoelectric system of Pb(Zn 1/3 Nb 2/3 )O 3 -Pb(Zr 0.5 Ti 0.5 )O 3 (PZN-PZT) are investigated for the optimal energy harvesting characteristics of the resultant nanofiber-based nanogenerators. The PZN-PZT nanoparticles were embedded into a matrix of [P(VDF- TrFE)] by the electrospinning process. The enhanced energy harvesting performance of flexible composite nanogenerators was obtained with the values of ~3.4 V output voltage and ~240 na output current for the 20 vol% nanoparticles-incorporated single sheet. The charging capability was found to be enhanced by designing the nanofiber composite sheets in series. As an example, the double stacked sheets resulted in a very fast ~5.7 V charging capability. P2-S22-1 Observation of Thermal Degradation with Foramidinium-based Perovskite Materials FA 기반유무기하이브리드페로브스카이트물질의열화현상관찰지수근 *. 서울대학교 During last years, inorganic-organic perovskite materials have been received attention as absorption layer for next generation solar cells owing to its excellent photovoltaic properties for solar cells. Although perovskite solar cells exhibit high power conversion efficiency up to 22.7% in a short period of time, low stabilities against thermal and humidity are drawback for impeding commercialization. In general, formamidinium (FA)-based perovskite exhibits superior thermal stability compare with methylammonium (MA)-based perovskite. Therefore, several researches have employ FA-based perovskite materials for efficient and thermally stable device. However, diverse analysis of thermal degradation behavior is needed to understand thermal stability of perovskite materials. In our study, we report thermal degradation behavior of Cs/FA cation-containing perovskite materials. We observed thermal degradation behavior with different annealing time in inert atmosphere via structural, optical analysis. The results of X-ray diffraction and Uv-Vis spectroscopy about Cs/FA perovskite showed negligible variation between the initial and thermal stressed sample. From the photoluminescence analysis, however, we confirmed that thermal stressed perovskite changed to considerable defective state. Lastly, we thermally stressed device of Cs/FA perovskite with proper electron selective layer and confirmed excellent thermal stability that does not show efficiency decrease for near 200 h at 85 C. P2-S22-2 Fabrication of CH 3 NH 3 PbI 3 Layer from Electrodeposited PbO 2 Layer for p-i-n Type Planar Perovskite Solar Cells p-i-n 타입 perovskite solar cell 제작을위한 PbO 2 층전기화학적생성과 CH 3 NH 3 PbI 3 로의화학적변화이동석 *, 박익재. 서울대학교 Hybrid organic-inorganic perovskite solar cells recently have received much interest for next generation photovoltaic devices due to simple manufacturing process, low-cost, and high energy conversion efficiency. Relatively large bandgap of perovskite materials enables the fabrication of tandem solar cells with small bandgap Si or thin film solar cells. However, Si cell usually has random pyramid texture which makes it hard to form compact and crystalline perovskite layer on top of Si layer through conventional solution spin-coating technique. Electrodeposition method is scalable, low-cost process, and widely used way to form the various film regardless of substrate morphology. Here, we demonstrate electrodeposition and chemical conversion method for perovskite layer fabrication. PbO 2 layer was deposited from Pb nitrate aqueous solution at constant potential on ITO/NiO x layer. Then, PbO 2 layer was reduced into PbO by thermal-annealing it in hydrogen/ar atmosphere. Finally, MAPbI 3 was synthesized from PbO film by vapor phase deposition of MAI in vacuum chamber. As a result, uniform and compact perovskite films were successfully formed without lead oxide or PbI 2 residue. P2-S22-3 CuGeO 3 /graphene Composite as an Effective Electrocatalyst for Li-O 2 Batteries Li-O 2 배터리에효과적인 CuGeO 3 /graphene 복합체전기촉매이광희 *, 김동완. 고려대학교 Li-O 2 배터리는다공성공기극표면에서가역적산소환원반응 (ORR) 과산소발생반응 (OER) (i.e., 2Li + O 2 + 2e Li 2 O 2, E 0 = 2.96 V versus Li/Li + ) 을통하여리튬이온배터리가나타내는에너지밀도보다몇배더큰에너지밀도 (> 3500 Wh/kg) 를달성할수있다. 공기극의전기촉매는 ORR 및 OER를통한방전 - 방전순환효율을향상시킬수있다. ORR/OER를촉진하기위해효과적인카본기반촉매로서탄소-귀금속 (Pt/C, Ir/C 및 Ru/C) 이연구되어왔다. 그러나대부분의귀금속기반전기촉매는값이비싸고사이클안정성이좋지않다. 최근, 전이금속산화물은귀금속기반전기촉매를대체하기위해관심을끌고있다. 이연구에서, 우리는전기촉매로서 CuGeO 3 /graphene 복합체구조를조사하였다. CuGeO 3 / graphene 복합체는 one-pot hydrothermal process를사용하여합성하였다. CuGeO 3 /graphene 복합체는 1차원 CuGeO 3 나노와이어와 2 차원 graphene의복합화를통해형성되었다. 우리는 CuGeO 3 나노와이어와비교하여 cyclic voltammetry, galvanostatic cycle, rate capability 성능과같은전기화학적특성을통해전기촉매활성을분석하였다. CuGeO 3 /graphene 복합체가공기극에적용되었을때 한국세라믹학회 163

174 2018 년한국세라믹학회춘계연구발표회 우수한전기화학적성능이달성하였다. CuGeO 3 /graphene 복합체는잘정렬된 1D/2D 복합체구조체의시너지효과에의해효율적인전기촉매활성나타난다. P2-S22-4 Enhancement of Electrical Properties of Perovskite Solar Cells Through Li-doped Nickel Oxide Hole Extraction Layer Li 도핑된 NiO x 정공전달층을이용한페로브스카이트태양전지의전기적특성향상박민아 *, 박재현, 장주희, 홍인화, 김진영. 서울대학교 As an alternative to PEDOT, nickel oxide (NiO x ) in the p-i-n type planar perovskite solar cells has attracted the most interest due to its large bandgap (3.6 ev) and deep valence band (5.4 ev) which possesses favorable energy level alignment with perovskite material. In spite of significantly improved VOC, the photovoltaic performance of NiO x in perovskite solar cells is still not sufficient when compared with the performance of PEDOT : PSS and other organic HTLs because of deteriorated fill factor. Here we demonstrate a Li-doped NiO x hole-extraction layer annealed at relatively low temperature that shows significantly improved fill factor compared to the pure NiO x counterpart. The improved fill factor has been ascribed to the enhanced electrical conductivity, evidenced by the conductive-afm experiments. As a result, the conversion efficiency of the p-i-n type planar perovskite solar cell with a Li-doped NiO x layer was enhanced by 21% compared to pure NiO x hole-extraction layer. P2-S22-5 Enhancement Resistive Switching Property by Composite of RbPbI 3 and MAPbI 3 RbPbI 3 와 MAPbI 3 혹합물에의한저항변화메모리소자특성향상이상명 *, 전재범, 이동건, 정현석. 성균관대학교 Recently, organometal halide perovskite (OHP) active layer has been suggested as an alternative to oxide and chalcogenides active layer. This resistive switching memory based OHP active layer have high performance properties that are important to fast information storage and low consumption due to low operation voltage and high ON/OFF ratio. The most studied OHP active layer is MAPbI 3. However, resistive switching memory based MAPbI 3 have poor endurance properties because of the uncontrollable formation of conduction filament. In order to be enhanced endurance, composition engineering has been undertaken. Here in, we report the resistive switching memory of mixture perovskite that are composed two different structure and compare switching characteristics depending on different structure ratio. We found that composite of RbPbI 3 and MAPb I3, which exhibited the enhanced resistance ON/OFF ratio and endurance properties to compare with other pure perovskite materials. The poor endurance of MAPbI 3 was overcome due to controllable formation of conduction filament by insulator RbPbI 3. This mixture composition is expected to be alternative materials for resistive switching memory. P2-S22-6 Humidity Stbility Improvement of Organic-Inorganic Hybrid Perovskite Solar Cells Using Amino Acid Additives 아미노산첨가제를이용한유무기복합페로브스카이트솔라셀수분안정성증대윤성철 *. 연세대학교 Organic-inorganic hybrid perovskite solar cells recently received tremendous attention due to its low-cost facile fabrication process and high performances. However, its poor humidity stability has hindered perovskite solar cell s commercialization. Recently, several researches unveil the mechanisms of humidity induced degradation mechanism of perovskite absorption layer. Water molecules easily penetrate perovskite s grain boundary and it propagates through perovskite layer in in-plane direction. Several methods are conducted for humidity stability improvement of planar perovskite layer such as addition of polymers like PVA (Polyvinyl Alcohol) and PVA mhi (Polyvinyl Ammonium hydroiodic acid). In this research, we enhanced humidity stability of perovskite absorption layer in planar structure perovskite solar cells by adding amino acid salts. By simply adding amino acid salts (PABA HI(4-aminobenzoic acid)) into perovskite precursor solution, we enhanced power conversion efficiency and stability against moisture. Increased stability against humidity of perovskite absorption layer comes from blocking water molecule penetration route to perovskite grain boundaries by forming hydrogen bonds between amino acid salts and halide atoms at perovskite grain surface. This research on the humidity stability enhancement of perovskite layer will contribute to commercialization of perovskite solar cells. P2-S22-7 CuCrO 2 Particulate Films as Hole Transporting Layer for CH 3 NH 3 PbI 3 Perovskite Solar Cells CuCrO 2 나노크리스탈을홀수송층으로적용한페로브스카이트태양전지정성화 *, 서성록, 신현정. 성균관대학교 CuCrO 2 is a promising material as transparent p-type conducting oxide. It shows unique optical and electrical properties, for example, wide band gap, good chemical stability, well-aligned energy level to CH 3 NH 3 PbI 3, p-type carrier transporting ability originated from delafossite crystal structure. In recent, the CuCrO 2 layers are suggested as hole transporting materials for organic-inorganic CH 3 NH 3 PbI 3 perovskite solar cells. In this study, we fabricated inverted (p-i-n) type planar perovskite solar cells with CuCrO 2 nanoparticulates films synthesized by hydrothermal method. In addition, the particulate layers were fabricated without further heat treatments by replacing from trivalent Cr to divalent Mg ions as dopants. The champion device was recorded to 13.1% of power conversion efficiency and CuCrO 2 based devices show improved stability in ambient air compared with the standard PEDOT:PSS based perovskite solar cells. P2-S22-8 Semitransparent Perovskite Solar Module using AAO Template as a Scaffold 양극산화알루미늄지지체를이용한반투명페로브스카이트태양광모듈권혁찬 *, 마선일, 김경미, 윤성철, 장규민, 양현하, 문주호. 연세대학교 Organic-inorganic hybrid perovskite solar cells have demonstrated huge potential as next-generation solar cells with low cost and efficient performance due to solution processability and excellent photovoltaic characteristics. In particular, semitransparent solar cells are of great interest for future applications, such as power-generating 164 한국세라믹학회

175 포스터발표 II window panels in buildings or automobiles, which would raise the usage ratio of solar energy without occupying additional space. For example, building-integrated solar cells could lead to the creation of completely self-sustaining, pollution-free buildings. To achieve this, various studies for fabricating semitransparent solar cells have been done and showed efficient transparencies and efficiencies. In order for these techniques to be practically applied, studies of scaling up must be developed, and furthermore, a large area semitransparent solar module should be developed. However, a semitransparent solar cell with a small area of a lab-scale is still dominant, since it is difficult to manufacture thin and uniform perovskite with a large area by a solution process. Herein, we fabricated uniform and thin large area perovskite layer through a spin coating method using an AAO template as a scaffold. This perovskite is vertically aligned onedimensional structures in AAO pores, and have the advantages of low reflectance due to periodic nanostructures and fast charge transport due to a one-dimensional structure. With this structure, a solar module of 4 4 cm 2 size was fabricated and achieved an average visible light transmittance of 30% and a performance of 6%. P2-S22-9 Long-term (~ 500 hours) Stable Perovskite Solar Cells at 85 C under 1-sun Illumination in Ambient Air with Inorganic Electron and Hole Transport Layers Exhibiting 무기계전자 / 홀수송체를사용한장기안정적고효율페로브스카이트태양전지서성록 *, 정성화, 배창득, 박남규, 신현정. 성균관대학교 Despite the high power conversion efficiency (PCE) of perovskite solar cells (PSCs), poor long-term stability is one of the main obstacles preventing their commercialisation. Several approaches to enhance the stability of PSCs have been proposed. However the accelerating stability test of PSCs at high temperature under the operating conditions in ambient air remains still to be demonstrated. Herein, we show interface engineered stable PSCs with inorganic charge transport layers. The highly conductive Al doped ZnO acts as efficient electron transport layer as well as dense passivation layer. This layer prevents underneath perovskite from moisture contact, evaporation of component, and reaction with a metal electrode. Finally the inverted-type PSCs with inorganic charge transport layers exhibited a PCE of 18.45% and retained 86.7% of the initial efficiency for 500 hours under 1-sun illumination at 85 C in ambient air with continuous electrical biases (maximum power point tracking). P2-S22-10 Orange-emitting CsPbCl 3 :Mn Perovskite Film for Illumination Application 조명용도의주황빛 CsPbCl 3 :Mn 페로브스카이트필름김원빈 *, 송영현, 이재명, 방기주, 정현석. 성균관대학교 Perovskite nanocrystals have been under active research due to their bright luminescence, narrow emission wavelength range, color tunability and wide color gamut area. Among them, CsPbX 3 (X = halide) all inorganic perovskite nanocrystals have better stability than organic-inorganic hybrid perovskite nanocrystals such as CH 3 NH 3 PbX 3. Nevertheless, CsPbX 3 nanocrystals still have stability problem from environment condition, like moisture. In this work, we fabricated Mn doped CsPbCl 3 perovskite nanocrystals using hot-injection method and film using UV curable adhesive. We compared optical properties and crystallinity of perovskite nanocrystals with various ratio of Mn precursor concentration. Secondly, we fabricated CsPbCl 3 :Mn Perovskite film by mixing with NOA. 63 UV curable adhesive and the optimized perovskite nanocrystals dispersed in toluene solvent. And fabricated perovskite film is attached on a 405 nm UV LED chip for device application. We measured optical properties and performance of device. Our perovskite device has broad 585 nm emitting range with FWHM of 92 nm and the device efficiency is 16.2 lm/w at less than 20 ma. Moreover, we tested the moisture stability by immersing the film in DI-water. We measured the PL intensity over time. Our perovskite film remained above 80% of the initial value after 36 h. As a result, this broad orange-emitting perovskite film can be applied as a color conversion material for commercial use in applications in the lighting and display area. P2-S22-11 All-Solution-Processed Cu@Ni Nanowire based Composite Electrode for Bottom Electrode of Hybrid Perovskite Solar Cells 페로브스카이트태양전지적용을위한전체용액공정구리-니켈코어-쉘나노와이어기반의복합전극제작김경미 *. 연세대학교 Organometal trihalide perovskites have attracted tremendous interest as promising materials for solar energy conversion. As a bottom electrode in perovskite solar cells (PSCs), indium tin oxide (ITO) is most commonly used. However, indium is rare metal and has high brittleness, which limits the commercialization. The silver nanowire has been investigated due to their high flexibility. But silver is also a high-cost noble metal. With these considerations, copper nanowire (CuNW) can be one of thepromising candidates as an alternative. However, CuNW electrodes degrade abruptly during perovskite absorber production and other upper layers, caused by the formation of CuI and copper oxide phase.herein, we developed Ni passivation layer around CuNWs to improve thermal/chemical resistance. Copper-nickel core-shell nanowires (Cu@Ni NWs) network electrodes were formed by simple deposition of CuNW electrodes (20 Ω/sq with 88.7% at 550 nm), followed by electroless plating of Ni. The Cu@Ni NWs did not show an increase in sheet resistances at 85 o C for over 100 minutes. In addition, when exposing to perovskite layer directly, the variation of sheet resistance was nearly unchanged unlikely to bare CuNWs. The PCE of PSCs derived Cu@Ni NWs TCEs were comparable to the conventional FTO based PSCs. These findings clearly suggest that our indium-free noble-metal-free Cu@Ni NWs derived electrodes have the great potential as a bottom electrode for low-cost perovskite solar cells. P2-S23-1 Fabrication and Electrochemical Properties of Aligned Red Phosphorus-Carbon Nanowires as an Anode Material for Na-ion Batteries 나트륨이온전지음극용정렬된적색인-탄소나노선의제조및전기화학적특성김주형 1*, 이현욱 2, 윤종혁 1, 김도경 1. 1 KAIST, 2 UNIST Li ion batteries have become widely accepted as an effective device for storing electric energy in recent decades. In practice, it can play an 한국세라믹학회 165

176 2018 년한국세라믹학회춘계연구발표회 important role in present energy industries for offering the highest energy density. However, there are still problems to be solved such as limit in remote, cost, and safety. To date, Na ion batteries has been considerably interested in the field of large energy storage system (ESS) because of needs to go beyond the limits of Li ion batteries. Extensive investigations on alloying reactions of various transition metal (Sn, Sb, Ge, Si etc) as anode materials have been carried out because of their high theoretical capacity. Inspired by this point, phosphorus is one of the most promising candidate with a high theoretical specific capacity (2596 ma h g 1 ) at the discharge potential range of V. In this paper, we have synthesized 3D structured red P-Carbon composite by facile templating method. For this process, we anticipated a lot of merits such as suppressing the large volume expansion (~300%), offering large reaction site, and minimizing the unnecessity like binders and additives. The electrochemical performance of red P-CNT composites were tested in sodium non-aqueous electrolytes. It could maintain the reversible capacity in high C-rate because of their structural advantage. In addition, differences of structural phase differences and conductivity during the alloying reactions in sodium system will be discussed. P2-S23-2 Carbon Nanocomposite with P-rich Nickel Phosphide as a Negative Electrode for Na-ion Battery 소듐이온전지용음극소재인니켈인화물을사용한탄소복합체에관한연구이종원 *, 홍성현. 서울대학교 Na-ion batteries (SIBs) are spotlighted alternative to Li-ion batteries (LIBs) due to the abundance of sodium and similar mechanism to that of LIBs. Various materials have been investigated to find out the effective anode for Na-ion batteries. Among them, P element has attracted a great interest as an anode material due to low cost and highest theoretical sodium storage capacity (~2600 ma h/g). However, due to its low intrinsic electronic conductivity (10-14 S/cm) and massive volume expansion, it shows a poor cyclabilty. Therefore, metal phosphides with carbon nanocomposites are suggested to solve the poor cyclability. In this work, we firstly synthesized the NiP 2 using high energy mechanical milling. The NiP 2 electrode delivered discharge and charge capacities of 763 and 561 mah/g with initial coulombic efficiency of 74% at current density of 50 ma/g. However, the capacity fading emerged below 400 ma h/g after 10 cycles. To enhance the poor cyclability, NiP nanocomposites were synthesized by carbon coating method using dopamine as a carbon precursor. P2-S23-3 Low-temperature Annealed Flexible Thin Film Batteries for Power Source of Smart Lens 스마트렌즈의전력원을위한저온결정화된유연박막전지이현석 1*, Parmar Narendra Singh 1, 김지완 2, 김광범 3, 최지원 1. 1 한국과학기술연구원, 2 경기대학교, 3 연세대학교 The smart lens is wearable device most closed to human living. The smart lens is most innovative and difficult technology to operate. The reason is that diverse micro devices have to be embedded in narrow area of lens and all micro devices need to have flexibility. These smart lens have been researched in various area such as display, video camera, health monitoring sensor. However, the research about most important energy storage system so as to operate smart lens has never been reported. In this work, we utilized olivine compounds in order to fabricate all-solid-state thin film battery to operate glucose sensor in smart lens. The olivine compounds thin film was deposited on polyimide (PI) substrate by Off-axis sputtering method. We fabricated all solid-state thin film batteries on PI substrates and investigated the electrochemical properties in order to attach to the contact lens. The battery exhibit the 19.5 μah/μm cm 2 discharge capacity. P2-S23-4 Superior Electrochemical Sodium Storage of V 4 P 7 Nanoparticles as an Anode for Rechargeable Sodium-Ion Batteries 나트륨이차전지용음극재 V 4 P 7 나노분말의전기화학특성김경호 *, 홍성현. 서울대학교 As a post Lithium-ion batteries (LIBs), Sodium-ion batteries (SIBs) are considered as one of the potential candidates for large-scale grid storage systems due to their low cost of resources. However, there are many challenges to overcome the thermodynamic/kinetic problems caused by the bigger ionic size of Na-ion. There have been extensive efforts to find the promising candidate as an anode for SIBs with intercalation/insertion materials, which show the stable cycle retention. Recently, basic researches for electrochemical properties of early transition metal oxides as an anode for SIBs have been conducted such as TiO 2, Li 4 Ti 5 O 12, and VO 2. However, the electrochemical sodium storage of vanadium phosphide (V-P) has not been studied even though it showed an overall lower insertion potential compared to VO 2 for LIBs. In the present study, we firstly synthesized the V 4 P 7 using highenergy mechanical milling and introduced as an anode material for SIBs. The V 4 P 7 phase showed insertion reaction mechanism and excellent long-term cycling behavior even it has no conductive carbon based material. P2-S23-5 Performance Test of All-solid-state Lithium Batteries Using Three Electrode System 최한울 *, 임형태. 창원대학교 Three-electrode setup is used to measure working electrode potential with respect to reference electrode. A reference electrode is utilized to understand reaction mechanism of single electrode (working electrode). Three-electrode cell is universally used in lithium ion batteries based on liquid electrolyte, whereas this kind of analysis has not been applied for all-solid-state batteries. The electrochemical performance of solid state batteries is inferior because of high interfacial resistance between solid electrolyte. Thus, it is important to in-situ measure the working electrode potential and interfacial resistance between electrode and electrolyte, in all-solid-state system. In the present study, we fabricated all-solid-state batteries consisting of 70Li 2 S-30P 2 S 5 solid electrolyte, lithium silicide anode and TiS 2 cathode, with indium reference electrode embedded in the solid electrolyte. The voltage between the reference electrode/ anode and the cathode/ reference electrode were measured using probe under open circuit condition and as a function of current density (C-rate). 166 한국세라믹학회

177 포스터발표 II P2-S23-6 Bifunctional Double Perovskite Oxide-based Materials for Energy Storage and Conversion Systems 에너지저장및보관시스템용이원기능성페로브스카이트기반소재연구박준영 *, 최성렬. 세종대학교 Due to emerging demands for clean and sustainable energy, hydrogen has been expected as one of candidate future energy sources. Among several applications using hydrogen, unitized reversible fuel cells (URFCs) have received many attentions because of their energy efficiency and simple systems. However, sluggish electrochemical kinetics with significant overpotential loss for oxygen evolution reactions (OERs) and oxygen reduction reactions (ORRs) of air electrode are high barriers to make commercialization of URFCs [1]. Until now, precious metal based electrocatalysts such as platinum, iridium, ruthenium and their alloys, have been used to enhance performance and kinetics of OER and ORR [2]. However, critical technical drawbacks such as low durability and high price have to be solved for making successful commercialization [3]. In order to deal with these issues, perovskite structure based oxide catalysts have considered as excellent bifunctional electrocatalysts to replace precious metal based electrocatalysts for air electrode in URFCs [4, 5]. In this work, to improve performances double perovskite-based catalysts, several methods are used to increase electrochemical surface area of catalysts. Furthermore, carbon based supporting materials are used to improve the electrical conductivity of materials [6]. The metal oxide-based catalysts are analyzed by various physicochemical tools. 1. Y. Liang, Y. Li, H. Wang, J. Zhou, J. Wang, T. Regier, H. Dai, Nat. Mater. 10, (2011). 2. H. T. Chung, J. H. Won, P. Zelenay, Nat. Commun. 4, 1922 (2013). 3. L. Lai, J. R. Potts, D. Zhan, L. Wang, C. K. Poh, C. Tang, H. Gong, Z. Shen, J. Lin, R. S. Ruoff, Energy Environ Sci. 5, 7936 (2012). 4. B. Zhao, L. Zhang, D. Zhen, S. Yoo, Y. Ding, D. Chen, Y. Chen, Q. Zhang, B. Doyle, X. Xiong, M Liu, Nat. Commun., 8, (2017). 5. N.-I. Kim, Y.J. Sa, S.-H. Cho, I. So, K. Kwon, S.H. Joo, J.-Y. Park, J. Electrochem. Soc., 163, F3020 (2016). 6. I.-S. So, N.-I. Kim, S.-H. Cho, Y.-R. Kim, J. Yoo, Y. Seo, Y.-S. Seo, B. Park, K. Kwon, J.-Y. Park, J. Electrochem. Soc., 163, F3041 (2016). P2-S23-7 NASICON-based Oxide as Li-ion Conductor for Composite Cathode of All-Solid-State Batteries NASICON 기반산화물의전고체전지용복합양극내리튬이온전도체로의적용연구유원규 1*, 정규남 2, 김한성 1. 1 연세대학교, 2 한국에너지기술연구원상용화된리튬이온전지 (Li-ion battery) 에사용되는유기계전해질 (aprotic liquid electrolyte) 의경우발화및화재의위험성이높아전지안전성향상을위해, 최근유기계액체전해질을무기계기반 (inorganic-based) 의고체전해질 (solid electrolyte) 로대체한전고체이차전지 (all-solid-state battery) 기술개발이활발히진행중이다. 리튬이온전도 (Li-ion conduction) 가가능한무기계기반고체전해질중산화물계고체전해질의경우, 황하물계고체전해질대비화학적, 기계적안정성이뛰어나며, 우수한입내이온전도특성 (bulk conductivity) 을보여최근많은관심을받고있는실정이다. 특히 NASICON 구조를갖는 Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) 의경우 perovskite 및 garnet 구조의산화물계소재대비낮은열처리온도, 높은이온전도특성및수분안정성등으로인해많은연구가진행되고있다. 리튬전도성고체전해질소재의경우 bulk 고체전해질로직접이용될수있을뿐만아니라, 전극내에서리튬이온전도특성을구현할수있는이온전도체로써적용이가능하다. 전고체전지의성능을개선시키기위해소재자체의이온전도도를높이는연구뿐만아니라, 전극내에서활물질과균일하게복합화가이루어져, 복합전극의리튬이온전도특성을개선시킬수있는연구가필요한실정이다. 본연구에서는 Pechini 기법을활용하여순수한 LATP 분말을제조하고, 이를 LiNi 0.6 Co 0.2 Mn 0.2 O 2 양극활물질과균일하게혼합하여복합화한복합양극 (composite cathode) 을제조하고, 이를전고체리튬전지에적용하여, 복합양극의전기화학특성을분석하였다. 복합전극조성, 바인더종류및전극로딩에따른전극단면구조를분석하여, 전극복합화에따른전기화학특성과의상관관계를해석하고, 복합전극특성을개선시키는연구를수행하였다. P2-S23-8 Sodium Iron Pyrophosphate Nanocomposites: Nanoand Composition-Engineering for High-Performance Sodium- Ion Batteries 고성능소듐이차전지용소듐- 철-피로인산염계나노화합물연구송희조 *, 김재찬, 주보배, 윤현석, 김동완. 고려대학교 Na 2 FeP 2 O 7 /C nanocomposites are prepared through the nano- and composition-engineering for the high-performance SIBs. First, general synthetic process for synthesizing Na 2 FeP 2 O 7 nanoparticles embedded in carbon is presented. From this synthetic process, uniform-size Na 2 FeP 2 O 7 nanoparticles which are homogeneously embedded in carbon matrix can be obtained. As a SIB cathode, Na 2 FeP 2 O 7 C nanocomposites exhibit not only reversible capacity near the theoretical value, but also they display superior rate capability and exceptional log-term cyclability even at high rates. Second, for improving the energy density of Na 2 FeP 2 O 7, Na 4-2x Fe 2+x (P 2 O 7 ) 4 /C nanocomposite is synthesized with the same synthetic process. Indeed, specific capacity of this composite is measured to be higher than that of Na 2 FeP 2 O 7. Furthermore, the addition of small amount of rgo in Na 4-2x Fe 2+x (P 2 O 7 ) 4 /C exhibits not only a high reversible electrochemical reaction, but also a superior rate capability. Therefore, these composites can be a promising cathode materials in SIBs. P2-S23-9 Synthesis of Carbon Coated NiS 2 Nanoparticles and Its Enhanced Electrochemical Properties as Sodium Ion Battery Anode 카본이코팅된이황화니켈나노입자의합성과나트륨이온전지음극으로써의전기화학적특성평가김형호 *, 홍성현. 서울대학교주로휴대폰등모바일 IT 기기의전원으로사용되고있는리튬이온전지는기술이발달함에따라자동차및에너지저장등의더큰저장용량을필요로하는용도로사용이확대되어그수요가급증하고있다. 그러나리튬원재료의높은가격으로인해이를대체하기위한나트륨이온전지의음극소재에대한연구들이활발히진행되고있다. 기존의리튬이온전지에서사용되던흑연이나실리콘등은나트륨이온전지에서그성능이극히제한적이므로이를대체할새로운음극소재의개발이매우중요하다. 나트륨이온전지의음극소재후보군으로써금속황화물은높은이론용량과전기전도도등의장점을가지고있다. 그러나충 방전 한국세라믹학회 167

178 2018 년한국세라믹학회춘계연구발표회 과정에서발생하는부피변화로인해전기화학특성이빠르게감소하는단점또한존재한다. 본연구에서는먼저약 870 mah/g 의높은이론용량을가지는이황화니켈을합성하여나트륨이온전지음극으로써의전기화학특성을확인하였다. 또한, 글루코스를소스로하여입자표면에카본막을코팅하여충 방전과정에서의극심한부피변화를견디면서높은용량과긴수명특성을동시에확보하고자하였다. P2-S23-10 Electrostatically Assembled Silicon-Carbon Composites Employing Amine-Functionalized Carbon Intra-Interconnections for Li-Ion Battery Anodes 아민치환된탄소를이용한전기적으로조립된실리콘-탄소복합체제조및리튬이온베터리음극소재로의적용채창주 *, 최웅희, 최영민, 김도엽, 정선호. 한국화학연구원 Recently, a tremendous attention has been devoted to exploit lithiumion batteries (LIBs) with high energy densities to keep pace with their ceaselessly growing demand in a variety of applications ranging from portable electronics devices to electrical vehicles. In the viewpoint of anodic materials, a various candidate materials have been investigated extensively over conventional graphite counterparts. The metal oxidebased anodes, governed by a conversion reaction, have theoretical capacities over that of graphite depending on compositions of them and the silicon has a high theoretical capacity of ~4200 mah/g; however, both anodic materials have the significant drawbacks that should be resolved for practical applications. In this study, we propose a facile aqueous chemical scheme of synthesizing electrostaticallyassembled, nanostructured Si-carbon composites. The negativelycharged graphene oxides (GOs) and Si NPs are intra-stacked with an addition of cationic polyelectrolyte, in an aqueous medium. Subsequently, the electrically conductive intra-pathways are established by incorporating the water-dispersible amine-functionalized multiwalled carbon nanotubes. The factors determining the electrochemical performances are investigated in intra-connected silicon-carbon composite materials, allowing for the cells exhibiting the capacities of 763 and 182 mah/g at current densities of 0.1 and 5 A/g, respectively. Apart from a conventional liquid-electrolyte-based cells, we also suggest a possibility of fabricating all-solid-state Li-ion batteries. P2-S23-11 All-solid-state Lithium Battery based on Li 2 S-C Composite Electrode 장기환 *, 최한울, 임형태. 창원대학교 The electrodes of all-solid-state cells have limited interfacial contact with the electrolyte as compared with the lithium-ion battery, and so it is necessary to increase the interfacial contact including the solid electrolyte during the production of the electrode 1-4. Therefore, the electrode fabrication process is step-wise and complex, and also needs to be simplified. In order to simplify the fabrication process, composite cathode was prepared using lithium sulfide instead of sulfur. In the lithium sulfide composite electrode synthesis step, amorphous [(80+α)Li 2 S-20P 2 S 5 (mol %)] is synthesized by planetary ball milling and the remained lithium sulfide acts as an active material. Lithium silicide (Li 4.4 Si), sulfide-based glass (Li 2 S-P 2 S 5 ), and lithium sulfide composite (Li 2 S + P 2 S 5 + acetylene black) were prepared as anode, solid electrolyte, and Li 2 S cathode, respectively. The electrochemical performance was examined under a constant current 200 μa (130 μa/cm 2 ) to investigate the property of lithium sulfide composite cathode on the gravimetric capacity (mah/g). The cut-off condition of the cells is from 0.5 V to 2.7 V. SEM (Scanning Electron Microscope) and EDS (Energy Dispersive Spectroscopy) mapping were performed to analyze the lithium sulfide composite electrode morphology. [1] K. Takada, N. Ohta, L. Zhang, K. Fukuda, I. Sakaguchi, R. Ma, M. Osada, T. Sasaki, Solid State Ionics, 179 (2008) [2] K. Takada, S. Nakano, T. Inada, A. Kajiyama, H. Sasaki, S. Kondo, M. Watanabe, J. Electrochem. Soc. 150 (2003) A274-A277. [3] Y. Seino, K. Takada, B.C. Kim, L. Zhang, N. Ohta, H. Wada, M. Osada, T. Sasaki, Solid State Ionics, 176 (2005) [4] N.M. Asl, J. Keith, C. Lim, L. Zhu, Y. Kim, Electrochim. Acta, 79 (2012) P2-S23-12 Synthesis of spherical multicomponent metal oxide particles containing tens of nanovoids and their lithium storage properties 나노포어들을내포하는다성분계금속산화물구형입자의합성과리튬이온저장특성평가박진성 *, 강윤찬. 고려대학교차세대에너지저장물질로서한층더높은용량과긴수명특성을갖는리튬이온전지음극소재물질들이개발되고있다. 이의일환으로서나노포어들을내포하는다성분계금속산화물구형입자를합성한후이의전기화학특성을평가하였다. 입자내부에중공구조를적용하면리튬이온전지의음극재에적용시넓은표면적의이점을활용하여전해질과의접촉을수월하게하며, 또한리튬삽입 / 탈리과정에서수반되는부피변화를억제하여전지의수명을증가시킬수있다. 이러한중공구조체에다성분계전이금속을적용하게되면 multiple valence states로인해높은용량을가능케한다. 본연구에서는대량생산에유리한분무건조공정을통해일차입자를얻고, 산화열처리과정을통해나노포어들을내포하는다성분계금속산화물구형입자를합성하였다. 분무건조시금속염들과덱스트린이상분리된입자를얻을수있으며, 산화과정에서덱스트린이분해및연소되어여러개의빈방들이존재하는입자를합성할수있었다. 산화온도에따라탄소-금속산화물복합체, 금속산화물구형입자등을얻을수있었으며, 이물질의음극재로서의리튬이온저장특성을평가하였다. P2-S23-13 Fabrication of Micron Sized Spherical Aggregate Powders Consisted of Hollow SnO 2 Nanoplates and their Electrochemical Properties 중공구조의 SnO 2 nanoplate로구성된마이크론사이즈의구형응집체분말제조및전기화학적특성박기대 *, 강윤찬. 고려대학교나노사이즈의로드, 플레이트, 구형형태를지닌입자로구성된다양한형태의응집체분말은에너지저장및가스센서, 촉매및바이오분야등여러분야에서우수한특성으로주목을받고있다. 특히리튬이온배터리의음극물질로써중공구조를가진나노구조체는배터리의충방전과정에따른구조체의붕괴현상을완화시키는데도움이되기때문에최근많은보고가이루어지고있다. 최근다양한중공구조를합성하기위한방법으로템플릿을사용하는방법에한계점을극복하고자템플릿을사용하지않는방법으로합성된다양한중공구조의합성이보고되고있다. 특히, 치밀한 168 한국세라믹학회

179 포스터발표 II 형태의금속셀렌화물을산화시킴에따라금속산화물로전환되는과정에서 Kirkendall effect 에의해중공구조의형태로바뀌는보고가새로운중공구조의합성매커니즘으로주목을받고있다. 본연구에서는 3D 구조의다공성구형입자를분무열분해공정에의해합성하고, 황화공정과커켄달효과에의한중공구조의금속산화물로변형시키는과정을통해중공구조의나노플레이트로구성된계층적구조의구형응집체를합성하여리튬이온배터리의음극물질로써전기화학적특성을평가하였다. P2-S23-14 Fabrication of Mesoporous NiO Nanoparticles Prepared by Spray Pyrolysis and Kirkendall Effect and their Electrochemical Properties 분무열분해공정및커켄달효과에의한다공성구조의 NiO 나노입자제조및전기화학적특성홍정후 *, 박기대, 강윤찬. 고려대학교최근 mesoporous 형태의나노입자가에너지저장및가스센서, 촉매및바이오분야등여러분야에서우수한물리적, 화학적특성으로인해주목을받고있다. 특히에너지저장분야인리튬이온배터리분야에서구조체안쪽까지의전해질의쉬운침투와충방전에따른구조체의유연성으로인해우수한특성을발휘하는데주목받고있는구조체의형태이다. 우수한구조체적장점으로인해다양한형태의 mesoporous 나노입자를합성하기위한방법들이보고되고있다. 특히, mesoporous 구조를지닌탬플릿을이용하는방법의단점을극복하고자탬플릿을사용하지않는방법들이최근다양하게보고되고있다. 본연구에서는분무열분해공정에의해서단일단계로단결정의니켈셀렌화물을합성하고산화공정을통해커켄달효과에의한다공성구조의지닌 NiO 나노입자를합성하였다. 해당다공성 NiO 나노입자는리튬이온배터리의음극물질로써우수한전기화학적특성을보여주었다. P2-S23-15 Synthesis of Fe 2 O 3 and FeSe 2 /graphitic-carbon using Metal-organic Framework Template and their Electrochemical Properties 금속-유기골격체를기반으로한 Fe 2 O 3 및 FeSe 2 / 흑연계탄소의합성및전기화학특성김진구 *, 박승근, 강윤찬. 고려대학교금속-유기골격체 (Metal-Organic Framework; MOF) 는합성의용이함과높은표면적을지니는특징때문에가스센서, 촉매, 수처리등의다양한분야에서연구되고있다. 비활성분위기에서열처리시유기물은탄화될수있기때문에이차전지음극재료로의활용또한주목받고있다. 본연구에서는철기반 MOF (MIL-88) 를이용해막대모양의 Fe 2 O 3 및 FeSe 2 / 흑연계탄소분말을합성하였다. 합성한 MIL-88을환원열처리후각각산화와셀렌화열처리를통해 Fe 2 O 3 및 FeSe 2 나노입자응집체를만들었으며, 각각의나노입자는 Kirkendall diffusion에의해중공구조로형성되었다. 이를각각리튬및소듐이차전지의음극재료로적용한결과, 우수한전기화학특성을나타내었다. 중공구조의도입으로충방전과정에서의부피변화에따른구조적파괴가완화되었으며, 극대화된반응면적으로율속특성이향상되었다. 특히, FeSe 2 / 흑연계탄소분말의경우흑연계탄소골격이구조적안정성과전도도향상을부여하였다. 그결과, 수백회의충방전이후에도 Fe 2 O 3, FeSe 2 / 흑연계탄소마이크로막대분말모두높은용량을유지하였다. P2-S23-16 Synthesis of Hollow Carbon Nano Composite by Spray Pyrolysis Process and their Electrochemical Properties Applied to Li-O 2 Battery 분무열분해공정을통한중공구조의탄소나노구조체합성과이를적용한 Li-O 2 배터리에서의전기화학적특성오연종 *. 고려대학교 Li 금속과 O 2 이반응하여용량을발현하는 Li-O 2 배터리는현재상용화된 Li-ion 배터리의비해 8배에달하는높은에너지밀도를나타내고있다. 이에따라에너지저장장치와전기자동차의발전과함께상용화에적합한차세대배터리로알려져있다. 그러나높은과전압과낮은 round trip efficiency, 그리고짧은수명으로인해상용화에는그제약이따르고있다. 이에따라서 Li-O 2 배터리는산소발생반응 (OER), 산소환원반응 (ORR) 반응에서의과전압을낮출수있는 bifunctional catalyst, 전기화학반응에서의 LiOH, LiCO 3 와같은부산물의발생을줄일수있는전해질, O 2 를공급할수있는분리막과같은다양한분야의연구가진행되고있다. 특히 bifunctional catalyst에사용되는활물질로 multiple valance state를가지는전이금속을이용하여 transition metal oxide 형태의 catalyst가 Li-O 2 배터리의 cathode 촉매물질로활발하게연구가진행되고있다. 그러나생성된 Li 2 O 2 를저장할수있는 open pore를가진 hollow 한형태의전이금속화합물에관한연구는많이진행되지않고있는상항이다. 이를바탕으로본연구에서는촉매로사용되는다성분계의전이금속과더불어구조적안정성과전기전도도를더욱높일수있는탄소소재의 hollow 한화합물을분무열분해공정을통해합성하는새로운시도를하였다. 형성된구조체는 Li-O 2 배터리의 cathode 촉매물질로서좋은전기화학적특성을나타내었다. P2-S23-17 Synthesis of CNT-hollow CoSe 2 Composites and their Sodium-ion Storage Properties CNT로연결된중공구조 CoSe 2 복합재료합성및나트륨이온저장특성평가양수현 *, 박승근, 강윤찬. 고려대학교나트륨의낮은비용과자원적풍부함으로인해최근 large-scale 에너지저장시스템으로써재충전할수있는나트륨이온배터리가널리연구되고있다. 그러나낮은용량과출력특성으로인해현재상용화에큰어려움을겪고있다. 이를극복하기위해새로운전극재료의개발은매우중요하다. 금속셀렌화물을기반으로한전극소재는뛰어난전기화학적특성으로인해최근들어많은관심을받고있다. 하지만금속셀렌화물의낮은전도성과충 방전중발생하는부피팽창은실제나트륨전지전극소재로평가시에그특성을저하시키는큰요인들로이를해결하기위한새로운구조를가진금속셀렌화물기반의전극소재의개발은필수적이다. 본발표에서는높은전도성을가진탄소나노튜브 (carbon nanotubes: CNT) 로연결된중공구조의 CoSe 2 복합재료를합성하고나트륨전지음극으로서의전기화학적특성을평가하였다. CoSe 2 를이어주는 CNT의높은전도성과 CoSe 2 의내부의중공구조로인해, 충 방전평가시전극내부에서빠른전자이동을가능하게하고, 삽입 / 탈리되는과정에서수반되는부피변화를억제하여나트륨전지의수명을크게증가시켰다. P2-S23-18 Synthesis of Graphitic Carbon Sphere Comprising Fe 2 O 3 /Se Hollow Nonosphere and their Electrochemical Properties Fe 2 O 3 /Se 중공나노입자로구성된흑연화된탄소마이크로스피어합성과전기화학적특성유용주 *, 강윤찬. 고려대학교 한국세라믹학회 169

180 2018 년한국세라믹학회춘계연구발표회 최근에리튬이온배터리의음극소재로서금속산화물나노구조체의형태제어가중요한이슈중에하나이다. 충방전과정중에리튬이온의반복적인삽입 탈리과정은구조체의부피팽창및수축을가져오며, 이는배터리수명특성에영향을주게된다. 최근에중공구조의금속산화물나노입자및나노구조체를음극소재로적용하여수명특성및율속특성을향상시킨연구들이보고되고있다. 중공구조는리튬이온과의반응면적을향상시켜주며, 리튬이온의확산거리를단축시켜주는효과가있다. 그럼에도불구하고, 음극소재로서금속산화물은고유의낮은전기전도도로인해율속특성이우수하지않는것으로보고되고있다. 따라서나노구조체의형태제어및전기전도도향상은리튬이온배터리의수명특성및율속특성향상에중요한이슈일것이다. 해당연구에서는흑연화된마이크로스피어내에중공구조의 Fe 2 O 3 /Se 나노입자가균일하게분산된복합전극을형성하였으며, 리튬이온배터리음극물질로서수명특성및율속특성이우수한전기화학적거동을보여주었다. P2-S23-19 Capacitive Effect of Carbon Dots made by Alkali Activation 알칼리활성화공정과정을이용한카본닷합성장수진 1*, 노광철 2. 1 고려대학교, 2 한국세라믹기술원 A combination of carbon nanodots and nanopores within turbostraticstructured carbon is demonstrated to lead to a capacitive effect in supercapacitors. The carbon dots are generated from a partially graphitic carbon structure using KOH activation because metallic K contributes to the expansion of the graphene layer stacks and then decomposes the epoxy and other functional groups into nanosize particles. Notably, the resulting sample has a high electrical conductivity and an improved additional volumetric capacitance of up to F/cc because the carbon dots act as nanogate carbon. This result clearly differs from all previous reports, opening up a new means of applying nanocarbons to energy-storage applications. P2-S23-20 Effect of C-coated/N-doped Activated Carbon for Supercapacitor with Conducting Agent Free Type Electrode C/N 도핑된슈퍼커패시터용도전재 free 형전극박주연 1*, 장수진 2, 노광철 1. 1 한국세라믹기술원, 2 고려대학교 For efficient use of activated carbon in supercapacitor, the poor conductivity of electrode material is a major problem. To tacke the problem, we have synthesized the activated carbon modified with pitch and melamine. In advanced of synthesis, an activated carbon was optimized with the KOH/C weight ratios of 2,3 and 4. We investigate the influence of KOH reagent amount on structure include the SSA, and pore size distribution. The modified surface of activated carbon with C and N is favourable to increase the electrical conductivity of activated carbon. The electrochemical performance of modified activated carbon is evaluated by conducting agent free type electrode. The obtained results of 2032 coin cell and three-electrode test showed ffectiveness of the doped C/N. P2-G3-1 Effect of Granule Characteristics on the Sintering of Alumina Ceramics 알루미나소결에미치는과립특성의영향 문이남 *, 김태경, 이현권. 금오공과대학교알루미나는대표적인파인세라믹스재료이며, 미분말을사용할경우높은표면에너지에의해건식성형에어려움이있다. 이에따라산업현장에서는일반적으로분무건조법을사용하여미분말을과립화함으로써해결하고있다. 이러한과립의특성은성형후소결체의물성에큰영향을미치기때문에과립을제어할필요가있다. 본연구에서는분무건조조건에따라과립특성을제어하고, 성형후소결체의특성을평가하여과립이소결체에미치는영향을파악하고자하였다. 실험은분무건조조건을달리하여과립을제조하고탭밀도, 입도분석, SEM 을통해평가하였다. 제조된과립을최종소결하여과립특성에따른소결체의특성을비교분석하였다. P2-G3-2 Evaluation of High Temperature Stability of Ceramics via Oxy-acetylene Torch Test 산소아세틸렌토치를통한세라믹의초고온안정성평가마호진 1*, 공정훈 1, 정욱기 1, 김동규 1, 허은석 1, 박진우 2, 김도경 1. 1 한국과학기술원, 2 국방과학연구소 When ceramic materials are applied for the aerospace vehicle in a high speed, the temperature increases drastically above 1500 o C due to air drag. To overcome external factors in harsh environment, materials should meet the outstanding thermal, mechanical properties and phase stability. The representative aerospace material is Si 3 N 4, which has high strength and thermal stability. However, it is difficult to measure the dielectric and thermal properties of Si 3 N 4 at the ultra -high temperature using the torch system since the Si 3 N 4 material is easily broken owing to high thermal expansion coefficient. Another candidate is fused silica, which can tolerate above 1500 o C and has low dielectric constant. However, the surface of fused silica melts and changes sample thickness that they bring about increase in dielectric loss. Therefore, it is required to find adequate materials without significant deformation during applying the heat. In this work, a variety of candidate materials were tested by oxyacetylene torch to evaluate the thermal and phase stability at the high temperature above 1500 o C P2-G3-3 Determination of Milling Efficiency by Ball Milling Sound Analysis 볼밀소음분석을통한최대분쇄효율결정김재홍 *, 박의근, 이현권. 금오공과대학교세라믹스제조에있어분쇄는매우중요한공정이다. 공정비용이저렴하고다양한재료를쉽게다룰수있는볼밀공정이소재분야에서널리채택되고있다. 일반적으로볼밀공정의효율측정은입도분석을비롯한경험적인데이터에의존하고있다. 이러한문제를보완하기위해최적분쇄효율에대한다양한변수에따른연구들이이루어지고있다. 최근에는볼밀과정에서충격과충돌에의해발생하는소음이밀의조작에유용한수단이될수있다고보고되고있다. 본연구에서는볼밀공정에서발생하는소음을측정, 분석하여최적분쇄효율을결정하고자하였다. 상업적으로많이사용되고있는알루미나분말을원료분말로사용하고, 녹음장치로소음을측정하였다. 이후, 녹음된소음을 FFT(Fast Fourier Transform) 분석하여볼밀공정에서발생하는소음과분쇄효율의상관관계를평가하고분석하였다. 170 한국세라믹학회

181 포스터발표 II P2-G3-4 Thermal Conductivity of AlN Ceramic Sheet Prepared by Non-aqueous Tape Casting 비-수계 tape casting법으로제조한 AlN 시트의열전도도특성김시연 1*, 여동훈 2, 신효순 2, 윤호규 1. 1 고려대학교, 2 한국세라믹기술원 AlN은열전도도가높고기계적강도가높으며절연특성이우수하기때문에반도체제조장비나전기자동차와같은고출력세라믹히터소재로많이쓰이고있다. 이를캐스팅공정을통하여성형할경우, 추가되는산소함량에따라서열전도도특성이감소하는문제점이발생하고있다. 본연구에서는, 열전도도가낮아지는문제점을극복하기위하여산소함량을낮추어시트를제작하였으며그린시트의충진밀도는 46% 을나타내었다. 최적의건조조건을통하여갈라짐이없는균일한시트로성형하였으며, 제작된시트는 1850 o C에서질소분위기로소결하였다. 소결밀도는 3.24 g/cm 3 을나타내었으며, 상온에서의열전도도는 160 W/mK을나타내었다. P2-G3-5 Active-passive Oxidation Behaviors of SiC f /SiC Composite SiC f /SiC복합체의능동-수동산화거동박지연 1*, 이호욱 1, 이승호 1, 신정호 1, 김대종 1, 이현근 1, 김원주 1, 윤순길 2. 1 한국원자력연구원, 2 충남대학교 SiC 계세라믹스는고온안정성이우수하여항공우주용부품, 가스터빈엔진부품, 열병합발전용가스터빈부품, 열교환기부품소재로고려되고있다. 그러나공기중이나산소가미량존재하는분위기에서는산화물의형성과기화에의한표면반응이물성열화의원인이되고있으며, 이를극복하기위한내환경코팅 (EBC, Environment Barrier Coating) 물질선정및공정 / 평가기술이개발되고있다. SiC 소재의산화거동은운전환경에따라산화층이형성되는수동산화와산화층이기화되는능동산화기구로설명되며, 두반응기구의전이에대하여많은연구가발표되고있다. 본연구에서는 SiC f/ SiC 복합체를고온에서열삭마하여발생되는산화층과복합체를분석하고, 기존에보고된 SiC의능동-수동산화전이현상을접목하여산화거동을이해하고자하였다. 복합체는전기영동침착과고온가압소결공정에의하여일본우베사의 Tyranno SA3 섬유를강화제로제조되었으며, 산화시험은케로신 (kerosene) 연료와산소로생성된불꽃을이용하여삭마시험을통하여수행하였고, 시험온도는 1300 o C ~ 2000 o C 범위이다. 산화거동은무게변화측정, 광학현미경과주사전자현미경을이용한미세구조관찰, X선회절분석, 라만분석및 EDS를이용한원소와상분석을통하여수행하였다. P2-G3-6 Properties of Oxygen Transport Membrane Ceramicmetal Alloys Joints by Reactive Air Brazing Reactive air brazing에의한산소분리막세라믹-금속합금접합의특성김명동 *, Wahid Muhamad FR, Amit Siddharth Sharma, 윤당혁. 영남대학교 To fabricate a multi-layered structure for maximizing oxygen production, oxygen transport membrane (OTM) ceramics need to be hermetically interfaced with peripheral metal components of the system. In this study, Ag 10 wt% CuO was evaluated as an effective filler for the reactive air brazing (RAB) of dense Ce 0.9 Gd 0.1 O 2 δ La 0.7 Sr 0.3 MnO 3±δ (GDC-LSM) OTM ceramics. RAB was performed at 1050 C for 30 min in air to obtain GDC-LSM joints with four different commercially available metallic alloys, such as Crofer 22 APU, Inconel 600, Fecralloy, and AISI 310S. The microstructure and elemental distribution of the ceramic-ceramic and ceramic-metal joints cross-sections were examined. The mechanical shear strength at room temperature for the as-brazed and isothermally aged (800 C for 24 h) joints of all the samples was evaluated. A comparison of results for the as-brazed and aged joints on their interfacial microstructure and mechanical shear strength are presented in detail. P2-G3-7 Fabrication of Y 2 O 3 -MgO Nanocomposite by Carbon Contamination Free Spark Plasma Sintering with Tungsten punch 텅스텐펀치를이용한탄소침탄이억제된 Y 2 O 3 -MgO 복합재의방전플라즈마소결김홍래 *, 홍성현. 서울대학교 Polycrystalline transparent ceramics, such as MgO, MgAl 2 O 4 and Y 2 O 3, have drawn lots of attention due to their excellent optical, mechanical, and thermal properties. Among them, Y 2 O 3 and MgO have a longer wavelength cutoff and a lower emissivity than the other mid-infrared materials. In addition, Y 2 O 3 -MgO nanocomposite below 150 nm grain size exhibits 80% mid-infrared transparency and superior mechanical strength than single-phase ceramics because one phase impedes the grain growth of the adjacent phases. In the fabrication process of Y 2 O 3 -MgO nanocomposite, grain growth should be suppressed to achieve the high transparency. In an attempt to make nanocomposite with 100 nm grain size, spark plasma sintering (SPS) has been applied. However, SPS requires a postannealing to remove the carbon contamination resulting from graphite die. Even after post-annealing, carbon associated bubbles can cause the optical degradation. In this study, Y 2 O 3 -MgO nanocomposite ceramic was fabricated via SPS to suppress the carbon contamination by introducing BN-coated tungsten punch instead of the conventional graphite punch. The fabricated Y 2 O 3 -MgO nanocomposite ceramic exhibited an excellent mid-infrared transparency without post-annealing. P2-G3-8 Effects of Ion Irradiation on Joining of SiC f /SiC with MAX Phase MAX phase를이용한 SiC f /SiC 접합에대한이온조사의영향 Pipit *, Amit Siddharth Sharma, 정동혁, 윤당혁. Yeungnam University SiC f /SiC composites were joined using a thin MAX phase tape filler, such as Ti 3 AlC 2 and Ti 3 SiC 2. Processing route were optimized by infiltration of SiC particulate slurry with Sc-nitrate as sintering additives into Tyranno SiC fabric using vacuum infiltration followed by hot-pressing. A butt-joint configuration was prepared after inserting 10 µm-thick MAX phase tape filler between two composites and joined at 1900 o C for 5 h under 3.5 MPa applied pressure. The joined composites were further subjected to ion irradiation using 0.2 MeV H + ions with a fluence of ions/m 2 at room temperature. Finally, a comparison between joint microstructures, phase evolution, formation of pores and cracks, and changes in mechanical strength for the irradiated and unirradiated joined composites will be attempted. P2-G3-9 Comparison of SiC and SiC f /SiC Joints Obtained by PCS and PSZ Preceramic Polymers 한국세라믹학회 171

182 2018 년한국세라믹학회춘계연구발표회 Preceramic polymer 인 PCS 및 PSZ 에의해접합된 SiC 및 SiC f /SiC 의물성비교정동혁 *, Amit Siddharth Sharma, Pipit, 윤당혁. 영남대학교 Silicon carbide and its composites (SiC f /SiC) is a promising material for applications such as aerospace, gas turbine and nuclear reactors driven by its excellent physical properties and their retention at high temperatures. However, due to the inherent brittleness, fabricating intricate SiC structures is a challenge. Here we performed joining of SiC and SiC f /SiC using ceramization of preceramic polymers. Firstly, we fabricate flat- and tubular-shaped SiC f /SiC by nano-sic matrix infiltration into SiC fabric and subsequent hot-pressing. SiC monoliths were also hot-pressed to obtain high densities (> 95%). Subsequently, commercially available polymers such as polycarbosilane (PCS) and polysilazane (PSZ) were utilized as fillers to obtain sound joints. The heating schedule (2 C/min heating rate, 1750 C, 10 MPa, 2 h soak) was carefully tailored to produce final SiC-rich joints so as to have pores- and cracks-free butt-joints. These strength values were further correlated with phase evolution and microstructure analyzed using SEM, XRD and Raman spectroscopy. P2-G3-10 Effect of Initial Porosity Condition on Mechanical Properties of Ceramic-resin Hybrid Block 초기기공조건이세라믹-레진하이브리드블럭의물성에미치는영향조용현 1*, 박주석 1, 이성갑 2, 김경훈 1. 1 한국세라믹기술원, 2 경상대학교 Due to improved medical care and quality of life, interest and demand for dental restorations in patients of congenital/acquired tooth defect are increasing worldwide. Dental materials, as crown material, can be classified as polycrystalline ceramic, metal and resin composite material. Each material has its limitations as a dental material. In order to overcome such problems, research on composite materials, which is a method of collecting the merits of each material, is actively under way, is actively pursued. As a dental materials, the hybrid block containing both zirconia with good mechanical properties and resin with good machinability is typical composite material. The purpose of this study is to investigate the effects of initial pore conditions of porous zirconia ceramics on the mechanical properties of zirconia-resin hybrid block fabricated by the infiltration process. Porous zirconia ceramic support, containing the pore former (Polymethylmethacrylate, PMMA) with various particle size, were sintered at 1200 o C temperature, air atmosphere, and then were fabricated by infiltration process (thermal polymerization) of the composite resin. To characterize the zirconia-resin hybrid block, bulk density, porosity, infiltration ratio, wear resistance, hardness, 3-point bending strength, x-ray diffraction (XRD), and scanning electron microscope (SEM) analysis were employed. P2-G3-11 열간가압소결법으로제조된 B 4 C-SiC 복합체의기계적특성소성민 1*, 김경훈 1, 박주석 1, 최우혁 2, 임연수 2. 1 한국세라믹기술원, 2 명지대학교탄화붕소 (B 4 C) 는경도와강도및파괴인성등기계적특성뿐만아니라내화학성과내침식성이우수하여여러분야에응용이가능한재료이다. 특히비중이 2.52 g/cm 3 으로다른세라믹소재에비해낮 고, 경도와탄성률이높아방탄효율이뛰어나기때문에개인용방호구, 항공기및차량용방탄소재등경량성과방탄성능이함께요구되는분야에서고기능성초경량방탄소재로우수한특성을나타내고있다. 하지만 B 4 C 는높은공유결합성으로인한낮은가소성과높은슬립저항성및고온에서도낮은확산계수를보이기때문에고밀도의소결체를제조하기어려운단점을가지고있다. 고밀도 B 4 C 소결체의제조에는 2,200 o C 이상의고온소결이요구되며소결조제를첨가하여액상을형성하거나비화학양론조성을유도하여소결을족진시키는방법이있다. 하지만소결조제를첨가하게되면비화학양론조성의 B 4 C 소결체를형성하거나소결체결정립계에비정질이차상이형성되어물성의저하가발생할수있다. 이에본연구에서는 B 4 C 와유사한물성을가지는 SiC 를이용하여 B 4 C 의우수한기계적물성을유지하며낮은온도에서소결이가능한 B 4 C-SiC 복합체를 2,000 o C 온도에서열간가압소결법으로제조하였다. 열간가압소결법으로 2,000 o C 에서소결한 B 4 C : SiC = 1 : 1 조성의복합체의경도는약 30 GPa, 꺾임강도는약 640 MPa 을보여우수한기계적특성을보였다. P2-G3-12 Fabrication of Silicon Carbide-Based Porous Ceramics Using Infiltration Technology 함침기술을이용한탄화규소기반다공성세라믹스의제조이계욱 *, 윤은섭. 성균관대학교반응소결 SiC의제조공정은상대적으로낮은온도에해당하는 1450~1600 o C 온도범위에서제조되며기공이없고소결체를짧은시간내에제조할수있으며, 반응소결후성형체의치수와형상을그대로유지하기때문에최소한의가공만으로원하는형태의 SiC 제품을제조할수있어높은경제성을갖는다. 반면에용융 Si의함침을위한통로를확보하기위하여 50 μm 이상의굵은입자를원료로사용하며과량의 Si를함침시킨다. 이는잔류 Si가존재하는굵은입자의미세조직을유발하여물성및고온특성을저하시킨다. 본연구에서는상기문제점들을해결하기위해서탄소와탄화규소만으로이루어진성형체의성형밀도를조절하여 Si의모세관현상에따른함침조건을정밀분석하고적정탄소분말의입자크기및성형정도를조절하여잔류 Si 양을최소화한 SiC 세라믹을제조하고이를다시재결정처리하여고강도의 SiC 다공체를제조하고자한다. P2-G3-13 Characterization of Thermo-physical Properties of UO 2 Pellets with Aligned Mo Microplates 판상형몰리브데늄금속입자가배열된 UO 2 소결체의열물성평가김동석 *, 김동주, 오장수, 전상채, 김건식, 김종헌, 양재호. 한국원자력연구원후쿠시마사고이후지난몇년간경수로핵연료의개발에있어사고저항성핵연료 (Accident Tolerant Fuel, ATF) 라는이름하에수많은노력및제안들이있었다. UO 2 핵연료소결체에있어서극복해야할이슈중하나는 UO 2 의열전도율이낮기때문에운전시소결체내부온도구배가극심해지며, 소결체중심온도가상승하게되어악영향을미친다. 이에따라, 만약 UO 2 핵연료소결체의열전도도를높일수있다면운전마진의향상은물론, 핵분열생성물방출의저감이나안전성향상에도큰도움을줄수있다. 본연구에서는소결체의수평방향열전도도를효율적으로높이기위해마이크로크기의몰리브데늄판상형입자를 UO 2 소결체내에수평으로정렬및분산시켰다. 이는기존의 UO 2 핵연료소결체제조공정을고려하여통상적인 UO 2 소결체제조방법으로얻을수있으며, 정렬된판상형몰리브데늄입자는소결체내에서열전도경로로작동하여 5 vol % 의판상입자혼합의경우, 1000 o C에서기 172 한국세라믹학회

183 포스터발표 II 존 UO 2 소결체보다약 80% 이상의반경방향열전도도가향상됨을확인하였다. 이와같이제조된판상입자금속함유 UO 2 소결체에대해공정변수별미세구조관찰및열물성측정을수행하였다. P2-G3-14 Densified Yttria Through Slip Casting Method using Bimodal-type Yttria Powder Bimodal 입도분포를갖는이트리아분말의슬립캐스팅을통한치밀한소결체제조에대한연구양영균 *, 이상진. 목포대학교 Y 2 O 3 는 2235 o C까지단사정구조로상전이가없으며 2425 o C의매우높은용융온도를갖기때문에 1800 o C 이상의고온까지도매우우수한화학적안정성과내열성을가지고있으며, 고온용내식성기판재료, 융융금속의제트캐스팅을위한노즐재료, 반응성이매우높은금속의용융을위한용기재료, 투광성재료등광범위한분야에널리사용되어왔다. 이러한이트리아의소결거동에서 1600 o C 이하의상압소결을통한 99% 이상의치밀한 Y 2 O 3 세라믹스의제조공정은현재까지보고된바없다. 본연구에서는 1600 o C에서상압소결을통해치밀한 Y 2 O 3 세라믹을얻었으며, 이를위하여 PVA 용액법을활용하여나노 Y 2 O 3 분말을제조하여마이크로미터단위의상용 Y 2 O 3 분말과일정비율혼합한후, 슬립캐스팅성형법을활용하여상압소결하였다. 높은성형밀도를얻기위한슬립캐스팅용슬러리의유동학적물성을고찰하였으며, 일축가압등기타성형방법으로제조된 Y 2 O 3 소결체와그소결특성을비교, 분석하였다. 수축률과소결밀도및미세구조를관찰하여슬립캐스팅으로제조된소결체의우수성을고찰하였다. P2-G3-15 Effect of Sponge Pore Size on the Physical Properties of Polyurethane-geopolymer Composite 스폰지기공사이즈가폴리우레탄 -지오폴리머복합체의물성에미치는영향 Chen Zhilei *, 이상진. 목포대학교지오폴리머 (geopolymer) 는알루미노실리케이트계원료와강알칼리자극제의탈수축중합반응을이용하여보다친환경적이고공정비용이비교적저렴한경화소재로일부국가에서건축소재로이용되기도한다. 최근이같은친환경적인특성으로인해관련연구가활발하게진행되고있으나, 이들대부분이공정개선및강도개선방법에그치는경우가많다. 본연구에서는메타카올린을사용한지오폴리머를기지 (matrix) 로하고폴리우렌탄스폰지를고분자로사용하여세라믹 -폴리머복합체를디자인하였다. 폴리우레탄스폰지의기공사이즈 (pore per inch (PPI) 10, 25, 45, 60) 에변화를주고이에대한기계적물성변화를고찰하였다. 미분쇄된카올린분말을열처리하여메타상으로제조하고이를실험에이용하였다. 연구의변수를최소화하기위해분말과혼합용액 ( 알칼리자극제와물유리의혼합용액 ) 의비율을 1:1로고정하였으며, 준비된폴리우레탄에슬러리를부어경화시켰다. 폴리우렌탄스폰지의기공사이즈가클수록최대 10% 미만의선형수축율을보였다. 이에반해폴리우렌탄스폰지의기공사이즈가작은경우에는시편의기공율이감소하였다. 각조건에따른시편의압축강도, 곡강도, 경도, 미세구조등을고찰하여복합체의기계적특성을고찰하였으며, 특히곡강도테스트를통한응력-변위곡선에서는낮은응력에서의인성증진거동이관찰되었다. P2-G3-16 The Effect of Graphite on the Property of Liquid Phase Sintered Porous SiC in Al 2 O 3 -Y 2 O 3 -SiO 2 System Graphite 첨가에따른 Al 2 O 3 -Y 2 O 3 -SiO 2 계액상소결탄화규소다공체의기계적특성의변화윤성일 1*, 박상환 1, 남산 2, 염미래 1. 1 한국과학기술연구원, 2 고려대학교탄화규소 (SiC) 는비산화물계세라믹으로서기계적강도, 화학적안정성및열충격특성이우수하여구조세라믹스재료로서널리사용되어왔으며, 이러한우수한기계적특성을갖는탄화규소다공체는디스플레이공정용진공척, 세라믹멤브레인, 고온분진필터등다양한분야에서이용되고있다. 본연구에서탄화규소다공체를소결하기위하여알루미나, 이트리아및실리카분말을소결조제로사용하였으며, 일정한기공크기를형성하기위하여 15 um 크기의탄화규소분말에 5um 크기의 graphite 분말을 0 ~ 10 wt.% 혼합하여사용하였다. 5um 크기의 graphite 분말이혼합된 15 um 크기의탄화규소분말과소결조제분말을건식으로혼합한뒤 PVA (1 wt.% sol) 용액을혼합하여 40 MPa 의압력으로일축가압성형하여성형체를제조하였다. 성형체를 Ar 분위기에서 10 o C/min 의속도로 1500 o C 까지승온한후 1 시간유지시켜소결하였다. 소결조제의함량이 15 vol% 에서 25 vol% 로증가함에따라 4 점굽힘강도는 55 MPa 에서 68 MPa 로증가하였으며, 겉보기기공률은 45% 에서 42% 로감소하였다. 또한일정한소결조제가첨가된조성에서 graphite 분말의함량이 2.5 wt.% 에서 10 wt.% 로증가함에따라기공율은 44.6% 에서 47.8% 로증가하였으나굽힘강도는 38 MPa 로크게감소하였다. P2-G3-17 Effect of Carbon Source on the Properties of Silicon Carbide Porous Material Prepared by Direct Reaction of Silicon and Carbon 규소와탄소의직접반응으로제조된탄화규소다공체의탄소원의종류에따른특성염미래 1*, 윤성일 2, 박상환 2, 최성철 1. 1 한양대학교, 2 한국과학기술연구원 In this study, the effects of the carbon source on the specific surface area, pore size and physical properties of meso - micro porous silicon carbide bodies manufactured by a direct reaction between silicon source and carbon source were investigated. Carbon black powder (1 um, 18 nm) and carbon black/cnt mixed powder were used as the starting material for the carbon source. Conventional ball milling process was used for the homogeneous mixing of carbon source and Si powders. The mole ratio of carbon to silicon was varied from 1.0 to 2.5, and the amount of CNT used in carbon source was varied from 0 to 30 wt%. The samples prepared by the uniaxial pressing method were heat-treated at a temperature of 1100 to 1250 o C for 10 h under an argon atmosphere. The pore characteristics and mechanical properties including specific surface area, porosity, compressive strength, mercury intrusion porosimetry and microstructure of the specimens were investigated. It was found that Si was completely reacted with carbon source at 1250 o C without any residual silicon. As the molar ratio of carbon in the starting material composition was increased, the compressive strength of the prepared porous silicon carbide decreased and the porosity increased slightly. Also, the size of the carbon black powder did not affect the porosity, but the compressive strength of the porous silicon carbide decreased as the size of the carbon black powder increased. As the amount of carbon source CNT was increased, the porosity of the prepared silicon carbide porous increased and the compressive strength decreased. 한국세라믹학회 173

184 2018 년한국세라믹학회춘계연구발표회 P2-G3-18 Joining of Sintered Silicon Carbide using SiC/C Mixture SiC/C 혼합재를이용한상압소결탄화규소의접합성현우 *. 성균관대학교탄화규소는고온특성, 내마모성, 내부식성등의뛰어난기계적특성을가지고있어다양한분야에응용이가능한고온구조용세라믹재료이다. 하지만약한취성과낮은형상가공성때문에복잡한형상의구조체나완제품제조가매우어렵다. 이와같은제한점을극복하고자탄화규소접합을시도하였다. 표면을연마한상압소결탄화규소시편사이에모재와유사한성분을갖는 SiC/C 혼합분말을접합재로사용하여접합하였다. 열처리는진공분위기에서진행하였고 1550 o C에서 1시간동안유지하였다. 열처리후 1000 o C에서의고온꺾임강도를측정하였고 OM과 SEM 등의분석장비를이용하여 SiC/C의조성비에따른접합단면의조직구조를관찰하였다. P2-G3-19 Fabrication and Corrosion Behavior of ZrC-SiC Composite Coating Layer SiC-ZrC 복합코팅층의제조및부식특성평가이현근 *, 김대종, 박지연, 김원주. 한국원자력연구원 SiC 세라믹스및복합체는고온에서의높은기계적특성과우수한조사저항성특성, 높은부식저항성을나타내어원자력분야의피복관및차세대원자로반응기부품으로의응용에대해연구가이루어지고있으며, 특히 SiC 복합체는높은파괴인성특성으로인해가스터빈, 열교환기와같은고온구조재료로의응용에대해많은연구가이루어지고있다. SiC 섬유강화복합체튜브는경수로의사고저항성핵연료피복관소재후보중의하나이며, 우수한고온특성과, 조사저항성특성을나타내고있으나, 정상운전상태의수화학부식환경에서부식특성에대한우려가있어추가적인연구가진행되고있다. 수화학부식특성을향상시키기위하여 SiC 복합체의기지상에대한부식저항성을향상시키기위한연구를진행하였다. 본연구에서는 SiC 복합체의기지상으로서 SiC-ZrC 복합코팅층의적용가능성과수화학부식특성에대하여연구하였다. SiC-ZrC 복합코팅층은부식환경에서 ZrO 2 또는 ZrO 2 복합산화물을형성하여부식특성을향상시킬수있을것으로기대할수있다. SiC-ZrC 복합코팅은화학기상증착법을이용하여각각 SiC는 MTS 소스를활용하여, ZrC는 ZrCl 4 분말을승화하여동시에증착하였다. SiC- ZrC 복합코팅의미세구조를 XRD, SEM, TEM을이용하여분석하였다. SiC-ZrC 복합코팅을수화학환경에서부식실험을진행하였으며, 부식실험이후미세구조에대하여분석하여 SiC-ZrC 복합코팅의부식저항성에대하여고찰하였다. P2-G3-20 Development of Metallic Microcell UO 2 Pellet for Accident Tolerant Fuel 사고저항성핵연료금속미소셀 UO 2 소결체개발김동주 *, 김동석, 김건식, 전상채, 오장수, 김종헌, 양재호. 한국원자력연구원 2011년일본후쿠시마원전사고이후, 안전성이향상된핵연료개발이전세계적으로크게강조되고있다. 세계각국은핵연료안전성향상을위한사고저항성핵연료 (Accident Tolerant Fuel, ATF) 의개념및기술개발을활발히진행중이다. 한국원자력연구원에서는독창적인사고저항성핵연료개념중하나로써금속미소셀 UO 2 소결체 (Metallic Microcell UO 2 fuel pellet) 개발을진행중이다. 기존의 UO 2 소결체내에금속그물망을배열하여, 열전도도를증가시킴으로써핵연료온도를낮추고핵분열기체의이동을저감시키는기능을갖도록한다. 이를통하여, 핵연료사고전개를지연및완화시 켜중대사고발생확률저감에기여할수있다. 개발중인금속미소셀 UO 2 소결체에대하여연구로연소시험을진행중이며, 온라인데이터측정을통하여그우수한성능을검증하고있다. 본발표에서는사고저항성핵연료금속미소셀 UO 2 소결체개발현황및연소시험진행결과를소개하고자한다. P2-S31-1 Fabrication of Environmental Barrier Coating for High Efficiency Gas Turbines 고효율가스터빈을위한열환경차폐코팅기술연구김지유 1*, 문흥수 1, 이기성 2. 1 ( 주 ) 세원하드페이싱, 2 국민대학교열환경차폐코팅기술은차세대에너지기술의원천으로가스터빈인발전분야뿐만아니라항공, 우주분야등에서많은연구가이루어지고있다. 최근열환경차폐 (Environmental Barrier Coating, EBC) 코팅은코팅분말인재료연구에서부터코팅공정, 코팅분석및평가에대한다양한연구분야에서연구가이루어지고있다. 본연구에서는 EBC 코팅분말에대한용사분말제조과정및대기플라즈마 (Atmosphere Plasma Spray, APS) 를이용한용사코팅층형성을연구하였고, 그에대한용사코팅층의물성분석및열충격평가에대한전반적인측면에서연구를진행하였다. P2-S31-2 Thermal Properties Evaluation of Thermal Barrier Coatings by Coating method 코팅방법에따른열차폐코팅의열적특성평가최소담 *, 이기성, 김태우, 이동헌. 국민대학교오늘날발전용터빈의효율은에너지의사용과도연관되어많은관심을받고있다. 이에따라터빈의효율을높이기위한여러가지시도들이시행되고있으며, 그중하나는열차폐코팅 (Thermal Barrier Coating) 이다. 열차폐코팅은모재를고온에서보호해줌으로써터빈의입구온도를더높게설정할수있다. 이로인해터빈의효율을증가시키는역할을하고있다. 이러한열차폐코팅은본드코팅층과탑코팅층으로나누어지는데탑코팅층은고온의환경에서모재를보호하는역할을하며, 본드코팅층은모재와탑코팅층간의열팽창계수차에의한박리를예방하는역할을한다. 또한본드코팅층의조성중알루미나성분은코팅층을통과한산소가모재로가는것을막고, 산소와만나피막을형성한다. 이로인해모재의산화를막을수있다. 이번연구에서는본드코팅층과탑코팅층의역할을극대화하기위하여 LGZ의건거리조건은 100 mm와 170 mm로변화를주었으며, 각건거리마다본드코팅층을두가지조건으로제작하였다. 본드코팅층의종류는 HVOF로만본드층을제작한것과, 동일두께비로 HVOF와 APS를사용하여본드코팅층을차례로적층시킨것이다. 총 4가지조건의시편을 1275 o C에서박리시까지등온사이클시험을진행하였다. 또한 900 o C와 1350 o C 사이에서 250 cycles씩박리시까지열충격시험을수행하여 4가지조건중가장열적특성이우수한코팅조건을선정하였다. P2-S31-3 Analysis of Crack Density by Thermal Shock of Environmental Coating Layer by Coating Layer Conditions 코팅층조건에따른내환경코팅층의열충격에의한균열밀도분석서형일 *, 이기성. 국민대학교가스터빈의개발은가스터빈의에너지효율을증가시키는방향으로진행되고있다. 이를위하여고온에서작동하는가스터빈이요구되며, 이에따른고온에서의내구성과경도를갖는재료에대한연구가진행중이다. SiC는고온에서의높은열내구성과높은경 174 한국세라믹학회

185 포스터발표 II 도를갖는특성으로고온가스터빈에사용될재료로적합하다. 문제는 SiC 가고온에서의수증기와산소와접촉으로발생하는화학작용으로질량감소를한다는것이다. 이는제품의수명과작동에영향을줄가능성이있다. 본연구에서는고온에서의 SiC 의열과환경의차단을위한코팅층의열충격에대한특성의평가를하였다. Sc 2 Si 2 O 7 와 Yb 2 SiO 5 를코팅층재료로선정하여, LGZ 열차폐코팅층과 bond 코팅층에 HfO 2 를첨가하는방식으로코팅층의조건을다르게하여시편을가공하였다. 가공된시편을사용하여고온에서의열충격시험을하였고, 광학현미경을통한미세균열의분석을통해균열밀도의변화를분석하였다. P2-S31-4 Feasibility of Rare-earth (La and Ce) Sulfates as Functional Embedding Agents in Thermal Barrier Coatings 열차폐코팅에서기능성치유재로서희토류 (La, Ce) 황산염의적용성김봉구 1*, 송도원 2, 송태섭 2, 박현명 1, 전수혁 1, 김준성 1, 정연길 1. 1 창원대학교, 2 한양대학교가스터빈고온부품에는모재의열화방지를위해열차폐코팅 (Thermal Barrier Coating, TBC) 이적용된다. 가스터빈의효율향상과대형화로인해터빈입구온도는지속적으로상승되고있으며, 이에기존열차폐코팅에적용되는이트륨이첨가된안정화지르코니아 (YSZ) 의적용한계성을야기하고있다. 특히, 기존 YSZ가적용된열차폐코팅은운용중발생하는복합응력에의한급격한파괴가발생할수있기에최근에는열적내구성향상을위한기존 YSZ 와치유물질의복합화연구가진행되고있다. 본연구에서는희토류 (La, Ce) 황산염의열차폐코팅치유재로서의적용가능성을고찰하였다. 펠렛시편과코인시편을준비하여압입시험을통해인위적으로크랙을유발하였으며, 펠렛시험편은등온열처리를진행하였고, 코인시편에반복열피로시험을각각진행하였다. 열처리중에황이 YSZ의높은산소이온확산으로인해산화되는동안, 지르콘실리케이트 (ZrSiO 4 ) 가생성되었으며, 이는 X선회절및 X선광전자분광법을통하여확인되었다. 치유재함유시편은 YSZ와기능성치유재간의반응으로인한균열치유및성장억제효과로향상된열적내구성을나타내었다. 본연구를통해기능성치유재로써희토류황산염의적용가능성을확인하였으며, 향후미세구조설계및캡슐화공정의최적화를통해고온부품의열차폐코팅으로적용될수있을것이다. P2-S31-5 Thermal Stability and Durability of Thermal Barrier Coatings with Evaluation Methods-Effects of the Purity and Crystal Phase of Feedstock Powders 열차폐코팅의평가방법에따른열적안정성과내구성평가 출발분말의순도및결정상에따른영향박현명 1*, 전수혁 1, Lyu Guanlin 1, 박태현 1, 정연길 1, 양병일 2, 박광용 2, 김인수 2. 1 창원대학교, 2 두산중공업본연구에서는열차폐코팅 (Thermal barrier coating, TBC) 시스템에서탑코팅용출발분말의특성이 TBC의열적안전성및내구성에미치는영향을고찰하였다. 탑코팅형성에사용된출발분말은일반순도분말, 고순도분말, 그리고고순도및 non-monoclinic phase를가지는분말, 총 3종의안정화지르코니아이며, 본드코팅은 Ni-Co계분말을사용하였다. 탑코팅과본드코팅은각각대기용사법과고속화염용사법을이용하였으며, 두께는각각 400 및 200 μm로형성하였다. TBC 시스템의열적안정성과내구성을평가하기위하여완만한온도변화에서진행하는반복열피로시험과급격 한온도변화에서진행하는제트엔진열충격시험을수행하였다. 반복열피로시험은 1100 o C 의열원에서 40 분간유지되며, 20 분간공냉하는방식으로진행하였으며, 제트엔진열충격시험은 1400 o C 의열원에서 25 초간노출시키고질소가스에서 25 초간냉각하는방식으로진행하였다. 반복열피로시험과제트엔진열충격시험결과, 고순도및 non-monoclinic phase 분말이적용된 TBC 시스템이상대적으로우수한열적안정성및내구성을나타내었으며, 이러한결과로사용환경에따른 TBC 시스템의적용성확보와조성설계의유효성을확인할수있었다. P2-S31-6 Cracks Generation and Lifetime Performance of Yb- Gd-Y-based Thermal Barrier Coatings with Buffer Layer in Thermally Graded Mechanical Fatigue Environments Lyu Guanlin 1*, 정성훈 1, 전수혁 1, 박현명 1, 정연길 1, Jing Zhang 2. 1 창원대학교, 2 Indiana University-Purdue University The effects of buffer layer on the crack generation and thermal fatigue behaviors of Yb-Gd-Y-stabilized zirconia (YGYZ) based thermal barrier coatings (TBCs) were investigated through thermally graded mechanical fatigue (TGMF) test. Double buffer layers, deposited with the regular and high purity 8YSZ, were introduced to enhance the thermomechanical properties in the YGYZ based TBC system. TGMF tests were performed at 1100 o C with a tensile load of 60 MPa, till 50% spallation of the top coat or cracking at the interface between the top and bond coats. The multilayer TBC showed longer lifetime performance compared to the single layer YGYZ based TBC, showing delamination and/or cracking at the interface between the buffer layer and the top coat in the multilayer TBC. The feedstock purity in the buffer layer was also effective in enhancing the lifetime performance of YGYZ based TBC system in the thermal and mechanical environments. Failure mechanisms in the layered TBCs were investigated and discussed based on the crack initiation and propagation behaviors observed through the TGMF tests. P2-S31-7 Change of Thermal Conductivity with Different Composition of 8YSZ/SiO 2 Thermal Insulation Coating by Suspension Spray Coating Technology 서스펜션플라즈마용사법을이용한 8YSZ/SiO 2 단열코팅의조성변화에의한열전도도변화전학범 1*, 최선아 2, 오윤석 2. 1 고려대학교, 2 한국세라믹기술원최근엔진열효율향상기술로서엔진부품용단열코팅기술이크게부각되고있다. 이는엔진의연소실내벽의단열코팅을통해연소실을구성하는부품의열특성을제어함으로써열손실을최소화하여연비향상을가능케하는기술이다. 단열코팅이가져야할특성은낮은열전도도와낮은열용량이다. 따라서낮은열전도도와낮은열용량의특성을가지는 YSZ와같은소재를사용하는경우단열코팅으로서의역할을기대할수있다. 본연구에서는 8YSZ와 SiO 2 의혼합조성코팅을제조하였고이때두가지소재의조성비와 SiO 2 원료의입자크기를다르게하여다공성의코팅을제조하고자하였다. SEM, XRD, Image analyzer, LFA 등을이용하여단열코팅의미세구조, 상형성거동, 기공도, 열전도도등을측정하였다. 각조성별코팅의기공도는 1~25% 의수준으로나타났으며, 기공도가높을수록열전도도가감소한다고알려진것과달리기공도차이에의한열전도도변화는크지않은것으로나타났다. 본연구의결과로부터코팅의열전도도는미세구조와같은구조적요인보다소재조성등의영향이보다큰것으로추정하였다. 한국세라믹학회 175

186 2018 년한국세라믹학회춘계연구발표회 P2-S31-8 Behavior of Phase and Microstructure with respect to Plasma Enthalpy Change of Ytterbium Dislicate Coatings Prepared by Suspension Plasma Spay 서스펜션플라즈마스프레이용사로제조된 Ytterbium DisIlicate 코팅의플라즈마열량변화에따른상형성및미세구조거동연구류호림 *, 오윤석, 이성민, 한윤수, 최균. 한국세라믹기술원 SiC 기반의 CMC (Ceramic Matrix Composites) 는초고온소재로여러분야에서관심받고있지만, 고온고압의환경에서발생하는수분등의산화환경에노출되면화학반응에의해부식이발생하여재료의수명을단축시키고, 장비의구동을저해한다. 이를방지하고고온, 고압의수증기환경에서기재를보호하여장비의수명을늘리기위해환경차폐코팅기술 (Environmental Barrier Coating, EBC) 이필요하다. 본연구에서, top coat로는 ytterbium disilicate (Yb 2 O 2 O 7 ) 을이용하였다. ytterbium disilicate 기재인 SiC와열팽창계수가유사하며, EBC에서주요특성인, 높은내산화성과내열성을가지고있다. 기판재는상용의소결 SiC를이용하였고, bond coat는 SiC 기판재와 top coat 사이의열팽창계수를보이는실리콘을사용하였다. 코팅제조방법으로서스펜션플라즈마스프레이 (suspension plasma spray, SPS) 방식을이용하여적용하였다. ytterbium disilicate를제작하기위해 Yb 2 O 3 와 SiO 2 분말을혼합하여 1500 o C에서하소한분말을서스펜션으로제조하여용사하였다. ytterbium disilicate를제조하기위해가스의유량을조절하였고, 낮은플라즈마열량을얻기위해서서스펜션제조용매에물을첨가하여다양한플라즈마열량으로용사하였다. 또한제조한 ytterbium disilicate 코팅층에대하여 XRD, SEM 과 TEM을통한결정상의확인과미세구조등을분석하였다. 이때낮은플라즈마에너지에서결정성을가진높은함량의 ytterbium disilicate의코팅층을얻을수있었으며, 높은플라즈마에너지에서는비정질및미세한 ytterbium disilicate입자를가진코팅층을얻을수있었다. P2-S31-9 Properties of Lanthanum Yttria Zirconate Prepared by Coprecipitation 공침법으로합성한란타늄이트리아지르코네이트의특성남정식 *, 이미재, 김진호, 이영진. 한국세라믹기술원열차폐용소재는에너지효율을위해서점점더높은온도에서가동되어지는추세이다. 하지만기존에서사용되던이트리아안전화지르코니아는 1200 o C도이상의고온에노출되면상분리가되거나냉각과정에서단사정으로전이되어부피변화로코팅층이열화되는문제가생긴다. 이에대한대응책으로란타늄지르코네이트등의희토류를첨가한지르코네이트계산화물이활발히연구되고있다. 란타늄지르코네이트는낮은열전도도를가지며파이로클로어단일상을가져서좋은상안정성을가진다. 하지만기존이트리아안정화지르코네이트에비해낮은기계정강도와열팽창률을가지는단점이있다. 따라서란타늄지르코네이트에이트리아를첨가하여해당문제를개선하고자하였다. P2-S32-1 Lication of Fluidized Ceramic Membrane Reactor Using Granular Activated Carbon for Treatment of Metal- Plating Wastewater 장수민 *. 인하대학교 There are upsurge of interests in ceramic membranes for the treatment of toxic industrial wastewater due to high chemical and thermal resistance. However, ceramic membrane is still too expensive. In this study, new ceramic membrane made of cost-effective, pyrophillite materials as support layer with coated alumina as active layer was developed for metal-plating wastewater. Ceramic membrane was submerged into a fluidized reactor combined with granular activated carbon. Comparative study was performed using the hybrid fluidized ceramic membrane reactor combined fluidized GAC particles to pretreat a real metal-plating wastewater. Both coated and non-coated membranes were investigated the role of active layer in TOC removal efficiency and fouling rate. Results showed that GAC fluidization reduced fouling rate considerably for both coated and uncoated membrane. More than 90% TOC was removed under GAC fluidization. Fouling rate was relatively higher with uncoated than coated membrane. TSS was near zero in permeate for both membranes. P2-S32-2 Effect of Carbon Content Changes on the Microstructure of HfC Film Fabricated by Using HfCl 4 -C 3 H 6 -H 2 LPCVD Systems 탄소의양변화가 HfCl 4 -C 3 H 6 -H 2 저압화학기상증착법으로제조한탄화하프늄박막의미세구조에미치는영향한장원 1*, 김대종 2, 이현근 2, 박찬 1, 김원주 2. 1 서울대학교, 2 한국원자력연구원 Hafnium Carbide shows good thermal ablation properties and chemical stability under ultra high temperature regions.these kind of materials are called Ultra High Temperature Ceramics (UHTCs). UHTCs are been used as coating materials in extremely high temperature applications like space rockets or re-entry vehicles. There are several reports of microstructural changes in bulk materials with carbon content amount. With the increase of carbon, microstructure shows fine grain size. On the other hand, the decrease of carbon content shows large crystallites. But, there were not much study on thin film with the carbon content changes. So, we have used Low Pressure Chemical Vapor Deposition (LPCVD) methods with HfCl 4 - C 3 H 6 -H 2 system for the film deposition to observe the effect of carbon. The phase and microstructures of the thin films were analyzed by XRD and SEM. Raman spectroscopy analysis were performed to assist the observation results of microstructural changes. In this study, we have investigated the influence of carbon content changes which affects the microstructure of HfC thin films. The results will be presented and discussed. P2-S32-3 Electrochemical Corrosion Behavior of Chemically Vapor Deposited Silicon Carbide Ceramics CVD SiC 세라믹의전기화학적부식거동신정호 *, 김대종, 이현근, 박지연, 김원주. 한국원자력연구원화학기상증착법 (chemical vapor deposition, CVD) 에의해제조된탄화규소 (SiC) 는우수한기계적특성및, 산화저항성을가질뿐만아니라우수한내마모특성으로운반용펌프밀봉재료등많은산업분야에응용되어사용된다. 특히, SiC 세라믹의내부식성은제조방법과조성에크게의존하는데, CVD법으로제조되어진 SiC는고순도를가지므로화학적으로매우안정하다. 그러나화학적으로안정한 CVD SiC 세라믹의전기화학적부식거동도증착조건에따른 CVD SiC 특성에따라다른부식거동을나타내는데, 소결된 SiC 세라믹의경우첨가제에의한전기전도도차이에따라부식거동을나타내었다. 산에서 SiO2 수동층형성과같은 SiC의전기화학적부식의일부특징이확립되었지만 CVD SiC의전기적특성과내부식 176 한국세라믹학회

187 포스터발표 II 성사이의메커니즘및상관관계에대한자세한정보는없습니다. 이연구에서 CVD SiC 세라믹의부식거동과전기적특성과의관계를이해하기위해전기화학적방법으로다양한 CVD SiC 세라믹의전기화학적부식을연구했습니다. P2-S32-4 Microstructure Control and Evaluation of Plasma Resistant YAS Frit Coating Layer 내플라즈마성 YAS계코팅층미세조직제어및특성평가박의근 *, 이현권. 금오공과대학교일반적으로반도체및디스플레이식각공정은플라즈마를활용하여진행된다. 이때, 플라즈마식각공정하에장시간노출되는부품들은내구성이떨어져식각장비의수명을낮추는문제점을야기시킨다. 이를위해내플라즈마성이우수한소재의채택이광범위하게이루어지고있으며, 최근에는내플라즈마성이우수한 Y 2 O 3 를이용한연구개발이진행되고있는추세이다. 하지만, 현재에는플라즈마식각공정에서코팅소재의입자탈락에의한공정상의오염이가장큰이슈가되고있으며, 이를위해소재개발과함께코팅층의미세조직제어에대한연구가지속적으로이루어져야한다. 본연구에서는 Y 2 O 3 의내플라즈마특성에버금가면서플라즈마식각에의한입자탈락을최소화할수있는코팅층을연구개발하고자하였다. 실험은내플라즈마성 YAS(Y 2 O 3 -Al 2 O 3 -SiO 2 ) 계프릿을제조하고, 제조된프릿을코팅조건을달리하여소결알루미나세라믹스표면에 YAS계코팅층을형성하였다. 제조된 YAS계코팅층을조건에따라비교분석함으로써 YAS계코팅층의미세조직을제어하기위한방법을제시하고자하였다. P2-S32-5 Development of TiC Coating Method using Vacuum Plasma Spray System 진공플라즈마용사장비를이용한 TiC 코팅기술개발김호석 *, 강보람, 홍성민. 전북대학교초고온세라믹스 (UHTCs, ultra-high temperature ceramics) 는 2,000 o C 이상의극한환경에서내열성, 내마모성, 기계적강도가우수하여열보호체 (TPS, thermal protection system) 등고온환경의내열구조재에적용되고있다. 초고온세라믹스중 TiC (titanium carbide) 는 3,100 o C 이상의높은융점, 내열및물리적충격에대한저항성, 화학적안정성이우수하다. 고온부품소재로대표적인탄소복합재는비교적저온에서산화가시작되므로탄소복합재를보호하고자 TiC를진공플라즈마용사장비 (VPS, vacuum plasma spray) 를이용하여탄소복합재표면에용사코팅하는기술을개발하였고, 형성된코팅층의특성을확인하였다. P2-S32-6 Improvement of Crystallinity by Heat Treatment of CVD SiC with Low Crystallinity 결정성이낮은 CVD SiC의열처리를통한결정성향상이승호 *, 이현근, 박지연, 김원주, 김대종. 한국원자력연구원 The chemical vapor infiltration (CVI) method is used to form the matrix during SiC composite fabrication for nuclear fuel cladding. The SiC deposited at low temperature using the CVI method contains an amorphous phase. In order to improve the crystallinity of the SiC layer and to observe the change of the microstructure accompanying with it, heat treatment was performed at 1400 o C for 1 h in an argon atmosphere. As a result, before heat treatment, SiC had a pebbleshaped microstructure and the initial morphology of the SiC surface was changed during heat treatment. The crystallinity of SiC was improved after heat treatment and crystal Si was observed by XRD and Raman analysis. Si was distributed irregularly on the whole observed by TEM analysis. It is known that the amorphous phase and Si generally have lower hydrothermal corrosion properties than crystalline SiC. To confirm the effect of SiC and crystallized Si on the corrosion resistance, which is improved in crystallinity by heat treatment, a corrosion experiment is to be carried out. P2-S32-7 Effect of Nanowire Growth on Mechanical Properties in SiC f /SiC Composites SiC f /SiC 복합체내에서 nanowire성장이기계적특성에미치는영향이호욱 1*, 김대종 1, 이현근 1, 김원주 1, 윤순길 2, 박지연 1. 1 한국원자력연구원, 2 충남대학교실리콘카바이드 (SiC) 는산화저항성및고온강도, 화학적안정성등이우수하여고온구조용재료로써적합하다. 이러한특성으로인해극한의환경에서도쓰일수있는재료로써각광받고있다. 하지만, 단미체실리콘카바이드는취성을갖는단점으로인해이를보완하기위한방법으로써 SiC 복합체제조의필요성이요구되었다. SiC 복합체의제조방법에는여러가지방법들이있지만그중에서도화학기상침착법 (Chemical Vapor Infiltration) 의경우다른제조방법에비해상대적으로공정온도가낮고, 섬유의손상이적은장점을갖고있다. 하지만이화학기상침착법으로제조한복합체의경우기지상을채워넣을때미처반응기체들이섬유사이에들어가지못해복합체내부에잔류기공이남게되고밀도가낮아지는단점을갖게된다. 이와같은단점을극복하기위해섬유와섬유사이에 nanowire들을성장시켜잔류기공의크기를줄여줌과동시에 nanowire들이새로운침착의 site로제공되는효과를얻고자하였다. 각각의 nanowire들을압력과온도를변수로두어성장시켰고이를바탕으로 SiC 복합체를화학기상침착법으로제조하였다. 또한일반적인화학기상침착법으로제조한 SiC 복합체와의기계적특성과미세구조의비교를통해 nanowire성장이 SiC 복합체에미치는영향에대해조사하였다. P2-S32-8 Yttrium Oxyfluoride Synthesis and Suspension Plasma Spray Coating Analysis Yttrium oxyfluoride 분말합성및서스펜션플라즈마스프레이코팅막의특성분석김민숙 1*, 김경훈 1, 박주석 1, 김경자 1, 김형순 2. 1 한국세라믹기술원, 2 인하대학교 Thermal plasma spray coating법은플라즈마를이용하여금속및세라믹등과같은원료를반용융또는용융상태로용사하는코팅법으로빠른속도로후막의제조가가능하다는장점을가지고있다. 기존의 thermal plasma spray coating의경우에는원료의원활한투입을위하여 30~200 μm 크기의과립분말을코팅원료로사용하기때문에고융점의세라믹코팅시과립분말의미용융등의문제로인하여코팅막내부에큰기공이존재하여낮은코팅막밀도, 모재와부착력저하, 층상형태의미세구조형성등다수의결함이발생하여코팅막의특성이저하되는문제를가지고있다. 반면 suspension plasma spray coating은과립분말대신 1~5 μm 크기의세라믹분말을용매에분산시켜 suspension 상태로원료를공급하여고밀도의코팅막제조와나노크기의미세구조형성이가능하기때문에기존의과립을이용한코팅법보다우수한특성의코팅막제조가가능하다. 본연구에서는 Y 2 O 3, YF 3 를원료로하여 yttrium oxyfluoride 분말을합성하였고 suspension plasma spray coating에적용하기위한 suspension 제조하였다. 또한제조한 한국세라믹학회 177

188 2018 년한국세라믹학회춘계연구발표회 yttrium oxyfluoride suspension 을이용하여 suspension plasma spray 코팅및조건별코팅특성을분석하였다. P2-S32-9 Application of Fluidized Ceramic Membrane Reactor Using Granular Activated Carbon for Treatment of Metal-Plating Wastewater 활성탄을유동하여세라믹멤브레인바이오리엑터에적용한도금폐수의전처리장수민 *, 장수민, 권대은, 김정환. 인하대학교 There are upsurge of interests in ceramic membranes for the treatment of toxic industrial wastewater due to high chemical and thermal resistance. However, ceramic membrane is still too expensive. In this study, new ceramic membrane made of cost-effective, pyrophillite materials as support layer with coated alumina as active layer was developed for metal-plating wastewater. Ceramic membrane was submerged into a fluidized reactor combined with granular activated carbon. Comparative study was performed using the hybrid fluidized ceramic membrane reactor combined fluidized GAC particles to pretreat a real metal-plating wastewater. Both coated and non-coated membranes were investigated the role of active layer in TOC removal efficiency and fouling rate. Results showed that GAC fluidization reduced fouling rate considerably for both coated and uncoated membrane. More than 90% TOC was removed under GAC fluidization. Fouling rate was relatively higher with uncoated than coated membrane. TSS was near zero in permeate for both membranes. P2-S32-10 Fabrication and Morphological Study of Converged SiC-TiC Fiber Mats by Elctrospinning 전기방사로융합된 SiC-TiC 섬유매트의제조와형태학적연구주영준 1*, 장석훈 1, 김철진 2, 조광연 1. 1 한국세라믹기술원, 2 경상대학교 Silicon carbide fibers with a high strength, excellent wear resistance and high temperature stability up to 2000ºC were fabricated by melt spinning or electrospinning of polymer precursor. In this study, electrospinning method was selected to fabricate polycarbosilane (PCS) green fiber mat because electrospun SiC mats have shown better temperature distribution than its melt-spun form. Therefore, the type and concentration of solvents for good spinnability of PCS were investigated. And, the Strength degradation of SiC fiber can be occurred after exposure at high temperature consequent to a crystallization process of amorphous SiC phase. This issue can be partially overcome with using titano-organic compound to produce a precursor for melt-spun SiC/TiC fiber. Titanium containing SiC fiber mats were fabricated by electrospinning method followed with polymer-derived ceramics route. Titanium isopropoxide has been used to cross-link into PCS structure in toluene and xylene contained medium. The mat structure, fiber morphology, crystallization of fabricated SiC fibrous mat was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). According to analysis results, the ceramic yield of precursor was increased significantly due to high degree of cross-linking process into PCS molecular structure. P2-S32-11 Heating Characteristics and Polymerization of Doped Polycarbosilane with Initiator under Microwave Irradiation 마이크로파하에서개시제가첨가된 PCS의열적특성과중합주영준 1*, 장석훈 1, 김철진 2, 조광연 1. 1 한국세라믹기술원, 2 경상대학교 Silicon carbide (SiC) fibers, which fabricated through polycarbosilane precursor were synthesized using curing process such as thermal curing, chemical vapor curing, and electron-beam curing. Although EB curing exhibits excellent properties in polymer-derived SiC fiber, it requires high cost and sophisticated equipment. And conventional thermal curing through the resistance heating requires a very long time. In this studies, the polymerization of PCS doped with initiator carries out by controlled microwave irradiation. The heating generated inside the structure by the reaction between initiator and microwave rapidly induced thermal curing of PCS. The increase of yield and molecular weight depending on irradiation power and time was investigated by TG and GPC. The decomposition of Si-H bond by thermal curing of PCS precursor was also observed using FT-IR. The cured PCS under microwave irradiation was pyrolyzed at 1300 and its elemental composition was analyzed by EDS. P2-S32-12 Synthesis of TaC Nano Powder Derived from Organometallic Complex and the Effect of Carbon on Crystal Growth 유기금속화합물을이용한 TaC 나노분말제조및탄소함량이결정성장에미치는영향이윤주 1*, 배성군 1, 강필재 2, 정수용 2, 최문근 2, 신동근 1. 1 한국세라믹기술원, 2 연세대학교유기리간드에의하여안정화된금속화합물인유기금속화합물은일반적으로석유화학이나유기화합물제조시촉매로사용되어왔으며, CVD 원료로도사용된다. 유기금속화합물은프리세라믹폴리머와같이유기물의특성를띄고있어복잡한형상을구현하는세라믹전구체로서의응용가능성이높다. TaC는잘알려진초고온세라믹 (UHTC) 중하나이며, 산화저항성이요구되는섬유강화세라믹복합체또는복합체표면코팅에사용된다. TaC 복합체또는 TaC 코팅은주로 CVD가사용되나, 프리세라믹폴리머와같이유기화합물의특징을가지는전구체를이용한다면공정을간소화할수있을뿐만아니라 CVD의한계점을극복할수있을것으로기대한다. 그러나 Ta 금속의안정화를위하여선택되는리간드에의하여열분해후잔존하는탄소에의해 TaC 결정의형성또는성장에영향을미치게되므로잔존탄소의거동과이의영향에관한연구가필요하다. 본연구에서는탄소수가다른 Me 3 CCH=Ta(CH 2 CMe 3 ) 3 와 Cp * -TaMe 4 를출발물질로하여 TaC를형성하고, 이때잔존하는탄소가 TaC 결정형성에미치는영향을확인하였다. 전구체의종류에따라차이를보이나 1800 o C 조건에서약 < 30 nm 크기의 TaC 결정이형성되었으며약 wt% 가량의탄소가잔존하였는데, TaC 결정형성온도와결정성장거동이탄소의양에의해결정됨을확인하였다. P2-G4-1 Ar Plasma Treated Transparent Ag Nanowire Electrodes for Flexible Quantum Dot Light-emitting Diodes Flexible QLEDs 제작을위한 AgNW-PI 복합체전극제작이형인 *, 김지완, 김재민. 경기대학교 Inverted film-processing method를이용해 coloress polyimide (cpi) 에 Ag nanowires (AgNWs) 를침투시켜전극을제작하였다. cpi와 178 한국세라믹학회

189 포스터발표 II AgNWs 의복합체 (AgNW-PI) 는낮은면저항을지니면서도아주투명하고큰유연성을지닌다. 이박막의 mechanical durability 는 5 mm 의 bending radius 를보였다. AgNW-PI 복합체를 anode 로사용하여녹색 quantum dots light-emitting diodes (QLEDs) 를제작하였다. AgNW-PI 복합체를 anode 로사용할시정공의주입이원활하지않은데이는 AgNWs 가복합체표면에묻혀있기때문이다. 이번연구에서 simple plasma treatment 를이용하여다른전도성물질의첨가없이 nanowires 가묻혀있는 cpi 층을제거하였다. 그결과, 확대된전기전도경로를통해 flexible QLEDs 의전기적, 광학적특성을조절할수있었다. 제작한소자는 bending test 결과약간이성능저하만을보였다. P2-G4-2 Selectively Light Adjustment by Oxide/Metal/Oxide Multilayer Coating on Quantum Dot Light Emitting Diodes OMO구조를이용한 QLED 발광특성연구이형인 *, 김지완, 김재민. 경기대학교 Colloidal quantum dots (CQDs) 은 OLED를이을차세대디스플레이소재로주목받고있다. CQDs은양자제한효과 (quantum confinement effect) 에의해입자사이즈에따른다양한색의구현이가능하며좁은반치폭 (full width at half maximum, FWHM) 을가지고용액공정 (solution-process) 을이용하기때문에가격절감, 대면적증착등의장점을지닌다. 하지만 CQDs를이용한전계발광 (electroluminescence, EL) 소자에서파장, FWHM과같은광학적특성들은봉지공정이후에는조절이불가능하다. Oxide/Metal/Oxide (OMO) 다층구조는값비싼 indium tin oxide (ITO) 를대체하기위해높은투과도와전기전도도에중점을두고연구되고있다. OMO 구조의산화물층과금속층의두께조절을통해빛의투과도를조절이가능하다. 이를이용해공정이끝난 EL 소자의빛을조절하는것이가능하다. 이번연구에서 EL 소자로부터발광되는빛을 OMO 박막에투과시켰을때의발광특성을연구하였다. P2-G4-3 Influence of Au Nanoparticles on the Performance of Green Quantum Dot Light Emitting Diodes (QLEDs) 양자점과금속나노입자의공진효과로인한양자점발광다이오드의광전자특성향상김재민 *, 김지완. 경기대학교양자점은양자제한효과와좁은발광선폭으로인해한가지의물질로다양하고선명한빛을구현해낼수있다. 따라서디스플레이업계는 OLED의뒤를이을패널로양자점의전계발광을이용한 QLEDs (Quantum dot Light Emitting Diodes) 의특성개선및기술개발에힘을쏟고있다. QLEDs는용액공정을기반으로소자를제조하기때문에비용이적게드는장점이있지만, 간단한소자공정에비해낮은밝기의효율은여전히개선해야할단점이다. QLEDs 업계에종사하는여러전문가들은 QLEDs의특성향상을위해대안을찾기시작했다. 그결과, 전자수송층에무기물나노입자를사용하는등의연구를진행했고그성능을확인하였다. 또한광추출기술은소자의휘도를향상시켜주는대표적기술중하나이다. 광추출기술중에서국부표면플라즈몬 (Localized Surface Plasmon) 현상은금속나노입자로인해빛의굴절과산란을조절하여외부로의발광효율을향상시켜주는기술이다. 이에우리는골드나노입자를사용해극성용매층인정공주입층에분산시켜소자의특성에미치는영향을분석하였다. 그결과양자점의엑시톤과정공주입층에자리잡은골드나노입자의강한공진효과로인해광전자특성이향상되는것을확인하였다. P2-G4-4 Fabrication of Mesoporous SnO 2 by Emulsion Synthesis and Application to Lithium Ion Battery 에멀젼합성을통한다공성 SnO 2 제조와리튬이온전지으로의적용김지훈 *, 채수동, 오승배, 장지민, 최경환, Manik Eknath Bhosale, Chi Linlin, 최재영. 성균관대학교 Recently, a study on the electrode material of a lithium ion battery having a high energy density is required to increase the capacity. Among them, Sn-oxide-based materials are expected as anode materials for Li-ion batteries. Sn oxide-based materials have high theoretical capacity, which is about twice that of conventional graphite. SnO 2 has a high theoretical capacity, but structural breakdown due to volume expansion. In this study, we carried out a study to make mesoporous SnO 2 using mesoporous silica sphere made by emulsion synthesis as a template. The Sn-oxide treated in our experiments maintains the porous structure and is not easily broken by volume expansion. SnO 2, made with mesoporous silica spheres, has a spherical morphology on a micrometer scale and has enough pores for volume expansion. It can also be synthesized at a relatively low cost compared to ordered mesoporous silica templates made using expensive block copolymer surfactants. P2-G4-5 Synthesis of the Vanadium Selenide (V 2 Se 9 ), One of the Single-chain Atomic Crystal, using CVD 기상증착법이용한단일사슬원자결정구조를갖는 V 2 Se 9 합성 Sang-Hoon Lee *, Hyung-Kyu Lim, Bum-Jun Kim, Kwan-Woo Kim, Nasir Tuqeer, Ik-Jun Choi, Byeong-Ju Jeong, Min-Ki Son, Jae-Young Choi. Sungkyunkwan University Carbon nanotube (CNT) maintain the concept of existing devices, overcoming the limit technology of the device, high strength, high sensitivity, miniaturization, ultra lightness, high precision. It also aims to implement functions.but CNTs could not be used practically because their physical properties changed as the chirality and radius changed. We have investigated "single-chain atomic crystal material", which is thermodynamically stable, has no surface defects, and has one-dimensionally isolated chains of materials. So we synthesize the Vanadium selenide (V 2 Se 9 ), one of the single-chain atomic crystal, using APCVD. P2-G4-6 S ynthesis of the Spherical Mesoporous Silica Using Emulsion Method 유화공정을이용한구형메조포러스실리카의합성장지민 *, 채수동, 오승배, 김지훈, 최경환, Linlin chi, Manik Eknath Bhosale, 최재영. 성균관대학교 Mesoporous materials with high specific surface area and porosity have very wide applications such as catalysts, secondary batteries, and sensors. The properties of porous materials are closely related to their spatial structure and chemical composition. Thus, the development of new porous structures allows a breakthrough of material limitations. For this reason, lots of approaches to produce the porous materials has been studied nowadays. In this study, we tried to synthesize spherical porous silica template using emulsion method. The emulsion synthesis method using water droplet as a reactor in water in oil phase can control the porosity and particle size of silica particles through emulsion droplet control. which can effectively control porosity and particle size. The synthesized 한국세라믹학회 179

190 2018 년한국세라믹학회춘계연구발표회 mesoporous silica spherical particles have a diameter of μm scale and a high surface area. It is expected to be applied as templates in a wide range of fields such as electronics and energy. P2-G4-7 Synthesis and Properties of Single-Chain Atomic Crystal V 2 Se 9 and Nb 2 Se 9 V 2 Se 9 및 Nb 2 Se 9 단일사슬원자결정의합성및특성오승배 *, 채수동, Akhtar Jahan Siddiqa, 최경환, 장지민, 김지훈, Linlin Chi, 최재영. 성균관대학교 Bulk inorganic materials have brittle property, therefore, it is hard to be applied to next-generation electronics like wearable devices. Instead, inorganic nanomaterials like nanosheet or nanowire have been studied to be applied to the flexible applications due to their flexibility and unique properties. Single-chain atomic crystals can be separated from their bulk 1D materials which consist of unit singlechain with van der Waals interaction. These wires have smaller than 1nm diameter with a good stretchable property. SCACs are also expected to have high mobility, flexibility, and unique quantum effects like previous 2D materials. On this perspective in the present work, we synthesized single-crystalline V 2 Se 9 and Nb 2 Se 9 SCACs by flux method and in case of Nb 2 Se 9, few millimeter needle-shape crystals have been synthesized. We confirmed the possibility of exfoliation of SCACs by dispersing them in solvents so that we are expecting they can be applied to future devices. P2-G4-8 Densification Behavior of Indium Oxide Powder Prepared From Vapor Route 기상법으로합성한 Indium Oxide 분말의치밀화특성오경식 *, 정태주, 박경난. 안동대학교스퍼터링에사용되는타겟은매우치밀하고미세한입자로구성되어야사용중불량예방에효과적이다. 이러한타겟을제조하기위해서는소결특성이우수한분말을필요로한다. 본연구에서는투명전도체타겟에사용되는 In 2 O 3 에대해기상합성공정을통해제조한분말의소결특성을조사하였다. 일축성형및정수압성형공정을통하여 In 2 O 3 성형체를제조한후 1400~1550도범위에서 2시간동안소결한결과분말의입도에따라소결후상대밀도는 85~95% 에분포하는것으로나타났다. 소결후휘발손실은최대 1.2% 였으나소결온도증가에따라 0.6% 로감소후다시 1.0% 로증가하였다. 이와같은소결특성및휘발손실의변화를소결중미세구조의변화로부터설명하였다. 아울러소결에따른입성장및시편내외부의휘발손실변화를추적하여기상합성분말의특징을관찰하였다. P2-G4-9 Synthesis of Single Chain Atomic Crystal Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 단일사슬원자결정구조의 Mo 6 S 3 I 6, Mo 6 S 4.5 I 4.5 합성법최경환 *, 오승배, 채수동, 장지민, 김지훈, Linlin Chi, Akhtar Jahan Siddiqa, 최재영. 성균관대학교 Nanowires have been attracted as suitable building blocks based on their 1D quantum effect and structural properties. Unlike the structure of MoS 2 which has being commonly used as a two-dimensional TMDC, Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 are the single chain atomic crystal (SCAC) comprised of a number of single-chains bonded with weak Van der Waals force. In comparing with typical 2D materials such as graphene or MoS 2, exfoliated Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 single-chains have less edge defects so that there is no chance their outstanding properties including mechanical, electrical and optical become worse due to the edge defects. Bulk Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 were synthesized through the solid-state reaction from the stoichiometric amount of elements. Then, the produced Mo 6 S 3 I 6 and Mo 6 S 4.5 I 4.5 were effectively exfoliated by ultrasonication and characterized by SEM, EDS and XRD. The separated SCAC was stable in air and moisture environment. P2-G4-10 Synthesis of Highly Efficient, Non-Cd Ag-(Ga,In)-S Visible Quantum Dots and Their White LED Application 고효율발광비카드뮴 Ag-(Ga,In)-S 퀀텀닷합성및백색 LED 제작응용김종훈 *, 장은표, 양희선. 홍익대학교 CdSe 및 PbS 퀀텀닷은높은발광효율및안정성등의이점으로인해개발되어왔지만환경유해성측면에서문제가되는 Cd 및 Pb 등을포함하기때문에친환경 III V 및 I III VI 계열반도체퀀텀닷으로의연구로방향이전환되고있다. Chalcopyrite 구조의 I III VI 계퀀텀닷은흡수파장과발광파장사이의큰 Stokes-shift으로인하여양자점간의재흡수현상을최소화할수있어 LED, solar luminescent concentrator 및바이오분야로활발히적용되고있다. 본연구에서는삼성분계 Ag-Ga-S와사성분계 Zn-Ag-Ga-S 및 Ag- In-Ga-S와같은 Ag 기반 I III VI 조성위주로퀀텀닷합성을진행하였으며, 이와같은퀀텀닷조성변화를통해청색 ~ 황색컬러의넓은가시광영역의발광을구현하였다. 또한청색 LED와결합을통해광변환기반조명용백색 LED를제작하여그특성을분석하였다. P2-G4-11 Stable, Full-colored White Light-emitting Diode Packaged with Silica-passivated InP Quantum Dots InP 퀀텀닷의실리카패시베이션및이를통한고안정특성풀컬러백색발광다이오드제작장은표 *, 김종훈, 양희선. 홍익대학교 InP 퀀텀닷은고색순도및고양자효율발광특성으로차세대디스플레이발광소재로자리매김하고있으나, 그열등한광안정성으로인해응용에제약을받는다. 퀀텀닷의안정성향상을위해기존 silica 합성법을이용하면물과촉매존재로인해실리카합성전, 후퀀텀닷의발광효율이현저하게떨어지게된다. 본실험에서는이와같은 silica 반응의한계를극복하고자, 추가적인물이나촉매없이 ATPMS을 silane precursor로하여 silica 반응을유도하여 silicaembedded InP 퀀텀닷복합체를형성하였다. 이와같은방법을적용하였을경우, 반응전, 후퀀텀닷의발광효율이거의완벽하게유지되었음을확인하였다. 이후 silica embedding된녹색및적색 InP 퀀텀닷을청색 LED에 on-chip 형태로도포하여 full-color 백색 LED 를제작하여장시간구동하에서매우우수한광안정특성을보이는것을확인하였다. P2-G4-12 Mg-치환의근자외선 LED용 Ca 2-x Mg x SiO 4 :Ce (0 x 1) 형광체의구조및발광특성 Structure and Luminescence Properties of Mg-Substituted Ca 2-x Mg x SiO 4 :Ce (0 x 1) Phosphor for NUV-LEDs 김동현 1*, 안성일 2, 김창해 3, 박중철 2, 김승주 1. 1 아주대학교, 2 신라대학교, 3 한국화학연구원 White light-emitting diodes (w-leds) have been developed by the combination of a blue-emitting InGaN LED chip and yellow-emitting Y 3 Al 5 O 12 :Ce (YAG:Ce) phosphor. The YAG:Ce phosphor exhibits 180 한국세라믹학회

191 포스터발표 II several advantages, such as long lifetime, lower energy consumption, higher reliability, and environmentally friendly composition for LED applications. However, it exhibits a low color rendering index of w- LEDs because of weak emission in the red spectral region. To overcome this disadvantage, it is necessary to develop new phosphor materials. Among the various newly developed materials, it is wellknown that the alkaline earth orthosilicate phosphors show good UV or blue light excitation and emission for w-leds, expressed as M 2 SiO 4 :RE (M = Ca 2+, Sr 2+, and Ba 2+ ; RE = Pr 3+, Eu 3+, Eu 2+, Ce 3+ and Tb 3+, etc.). Particularly, Ca 2 SiO 4 has attracted considerable attention because of various crystal structures and the Ce-doped β-ca 2 SiO 4 and γ-ca 2 SiO 4 phosphor with different crystal structures exhibit blue and yellow emission, respectively. The Mg 2+ -substituted alkaline-earth orthosilicate phosphors have generated significant research interest because Mg belongs to the alkaline-earth metal group even though there is little difference in the ionic radius between Mg 2+ and Ca 2+, i.e., 0.89 and 1.12 Å (CN=8) respectively. Despite many studies on Mg 2+ doped phosphors, the variation of the PL and the crystal structure with the varying Mg 2+ content has not been reported for the wide range of CaO MgO SiO 2 solid-solutions. Herein, we report the synthesis and characterization of Ca 2 x Mg x SiO 4 :Ce (0.00 x 1.00) phosphors, and discuss the variation of the PL property and crystal structures with the Mg 2+ - substitution rate. P2-G4-13 Chromium Removal by (3-aminopropyl)Trimethoxysilane(APTMS)-functionalized Mesoporous Silicas (3-aminopropyl)trimethoxysilane(APTMS) 로표면개질한다공성실리카에의한크로뮴제거이진형 1*, 최근수 2, 최재우 3, 이승용 1. 1 한국과학기술연구원 / 고려대학교, 2 울산과학기술연구원크로뮴화합물은염료, 페인트, 가죽태닝등다양한산업에서이용됩니다. 하지만육가크로뮴은강한독성을가지며, 인체에유해합니다. 육가크로뮴은일반적인 ph에서크로뮴산염 (CrO 4 ) 으로존재하기때문에물에잘용해되며앞서언급한산업단지부근의토양이나지하수를오염시킵니다. 따라서육가크로뮴을효과적으로흡착할방법을찾는것은매우중요합니다. 흡착은전도유망한기술중하나로, 높은효율성뿐만아니라운영상의단순함및경제적이점을가집니다. 본연구에서는다공성실리카를합성한뒤, 다양한 APTMS 농도 (0.01 M M) 에서아민표면개질한흡착제들을만들어크로뮴흡착능과다양한특성들을분석했습니다. APTMS의농도가증가함에따라흡착제들의표면적은계속해서감소했으며, 이를통해 APTMS가다공성실리카의표면에영향을끼친다는것을확인했습니다. 하지만 0.05 M와 0.25 M의조건에서합성한흡착제의 APTMS 하중은큰차이가없었으며, 크로뮴제거능력또한각각 mg/ g, mg/g로큰차이가없었습니다. 또한, 아민그룹중 NH 3+ 의비중이높은 0.25 M 조건의흡착제가크로뮴제거능력이우수한것을확인했습니다. 결론적으로, 반응한 APTMS양은 0.05 M에서이미포화상태이며, 크로뮴제거능력은아민기의활성에의해결정된다는것그리고아민그룹의 NH 3+ 와크로뮴음이온사이의정전기적인력을통한흡착메커니즘의가능성을확인했습니다. P2-G4-14 Synthesis and Characterization of Silica Aerogel Powders using Industrial Raw Materials and Regents 공업용원료및시약을이용한실리카에어로겔분말합성및특성허소연 1*, 안영수 1, 이진석 1, 홍창국 2, 이상은 3, 고혜인 2. 1 한국에너지기술연구원, 2 전남대학교, 3 화학연구원본연구에서는실리카에어로겔분말합성을위해시약이아닌공업용물유리, 겔화반응을위한염기성촉매대신에공업용알코올, 그리고공업용치환용매및표면개질제를사용하였다. 에어로겔분말합성을위해희석된물유리에무기산을첨가하여실리카졸을제조한후, 알코올을첨가하여습윤겔을얻었다. 이후용매치환및표면개질동시공정을수행한다음상압건조하여신속하게실리카에어로겔분말을합성하였다. 에어로겔분말의합성시분말용량을변화시킴에따른분말의특성에미치는영향과물성변화등을조사하였다. 이때희석물유리제조시증류수또는이온교화수사용, 그리고치환용매및표면개질제의첨가량등을변화시켰다. 이와같이하여제조된실리카에어로겔분말에대해비표면적, 기공크기및기공부피, 밀도, 미세구조등을분석하였다. P2-G4-15 Synthesis of GaNbO 4 ;RE 3+ (RE=Tb, Eu, Dy, Sm) Phosphors GaNbO 4 ;RE 3+ (RE=Tb, Eu, Dy, Sm) 형광체의제조조신호 1*, 함지영 2. 1 신라대학교, 2 부산동여고최근에백색발광소재와광전자소재개발에많은관심이집중되고있다. 본연구에서는높은화학적안정성을갖는모체결정 GaNbO 4 에다양한활성제이온 (Tb 3+, Eu 3+, Dy 3+, Sm 3+ ) 을도핑하여다양한파장을발광하는형광체분말을합성하였다. GaNbO 4 ;RE 3+ 형광체분말은초기물질 Ga 2 O 3, Nb 2 O 5, Tb 4 O 7, Eu 2 O 3, Dy 2 O 3, Sm 2 O 3 를화학양론적으로측정하여합성하였다. 이때모체결정에도핑된각활성제의 mol 비는 5 mol% 이었다. 정밀저울을사용하여초기물질의양을측정하고플라스틱병에 ZrO 2 볼과적당한양의에탄올을넣고 15 시간동안볼밀과 70 o C에서 20 시간동안건조한후에막자사발에서미세하게갈아서체로걸러내고알루미나도가니에담아서전기로에넣어 400 o C에서 3시간동안하소공정과 1100 o C에서 5시간동안소성하였다. 자외선파장으로여기시켜측정한 GaNbO 4 ;Tb 3+ 형광체의발광스펙트럼은 543 nm에피크를갖는가장강한녹색발광파장을비롯하여발광세기가상대적으로약한청색, 주황색, 적색발광파장이관측되었다. Sm 3+ 이온이도핑된경우에 4 G 5/2-6 H 9/2 전이에의한적색발광, Dy 3+ 이온의경우에 4 F 9/2-6 H 13/2 전이에의한 577 nm의황색발광이관측되었다. 실험결과는 GaNbO 4 모체격자에주입되는활성제이온의종류를변화시킴으로써발광색을조정할수있음을제시한다. P2-G4-16 Systematic Study of Interdependent Relation Ship on Gold Nanorod Synthesis Assisted by Electron Microscopy Image Analysis 전자현미경이미지분석을이용한금나노막대나노입자합성간화학적상호작용에대한종합분석윤석영 *. 성균관대학교 Here, we systematically investigated the independent, multiple, and synergic effects of three major com- ponents, namely, ascorbic acid (AA), seed, and silver ions (Ag+), on the characteristics of gold nanorods (GNRs), i.e., longitudinal localized surface plasmon resonance (LSPR) peak position, shape, size, and monodispersity. To quantitatively assess the shape and dimensions of GNRs, we used an automated trans- mission electron microscopy image analysis method 한국세라믹학회 181

192 2018 년한국세라믹학회춘계연구발표회 using a MATLAB-based code developed in-house and the concept of solidity, which is the ratio between the area of a GNR and the area of its convex hull. The solidity of a straight GNR is close to 1, while it decreases for both dumbbell- and dogbone-shaped GNRs. We found that the LSPR peak position, shape, and monodispersity of the GNRs all altered simul- taneously with changes in the amounts of individual components. For example, as the amount of AA increased, both the LSPR peak and solidity decreased, while the polydispersity increased. In contrast, as the amount of seeds increased, both the LSPR and solidity increased, while the monodispersity improved. More importantly, we found that the influence of each component can actually change depending on the composition of the GNR growth solution. For instance, the LSPR peak position red-shifted as the amount of AA increased when the seed content was low, whereas it blue-shifted when the seed content was high. P2-G4-17 Graphene Oxide Synthesised by Modified Hummers Method 개선된휴머스합성법에의해합성된산화그래핀송현석 *, 김민규, Chilinlin, Ashok Ugale, 유지범, 최재영. 성균관대학교 The graphene oxide is an aromatic structure graphene with the oxide group bonded to the surface, which causes the graphene oxide to be negatively charged to produce a highly dispersed solution at a high concentration. Oxidized graphene was prepared by a modified Hummers method in order to increase the degree of oxidation of the graphene oxide and to maintain the large sheet size. To confirm the properties of graphene oxide, aqueous solutions of graphene oxide were prepared and analyzed by various methods. First, UV-vis spectroscopy was performed to confirm the dispersibility of the graphene oxide solution. The sheet size of graphene oxide was measured in scanning electron microscope (SEM) and the thickness of graphene oxide was measured in atomic force microscopy (AFM). Then, the degree of oxidation and the ratio of the oxidizing group were analyzed by X-ray photoelectron spectroscopy (XPS). P2-S51-1 Synthesis and Characterization of Ceramic Composite for Stereolithography 광경화성 3d printing을위한세라믹복합소재합성및특성평가이진욱 1*, 남산 1, 황광택 2, 김응수 2, 김진호 2, 한규성 2. 1 고려대학교, 2 한국세라믹기술원 3d printing이란 3차원으로디자인된디지털정보에따라얇은 layer 를반복적으로적층하여복잡한형태의 3차원제품을생산하는공정기술이다. 3d printing기술은적층방식에따라다양한방식으로연구되어왔으며, DLP (Digtal light processing) 은 UV 프로젝터짐을이용하여광경화성소재를적층하는방식의 3d printing 기술이다. 기존 3d printing용소재는대부분플라스틱과금속을활용하고있으나, 최근에는다양한소재를 3d printing에적용하려는연구가활발히진행되고있다. 세라믹소재의경우, 우수한물리적, 화학적특성으로다양한산업분야에활발하게사용되고있으나경도가높고취성이강하므로복잡한형상이요구되는분야에적용되지못하고있다. 세라믹산업이나날이커져가는 3d printing시장에진입하기위한경쟁력을갖추기위해서는 3d printing용세라믹소재개발이매우시급한실정이다. 본연구에서는광경화방식의 3d printing에적용될수있는무기산화물기반의복합소재를합성하고 적층성형특성에대한분석을통해세람기소재를활용한 3d printing 에적용가능성에대해연구하였다. P2-S51-2 Coextrusion-based 3D Plotting Technique for Fabricating Porous Calcium Phosphate Ceramic Scaffolds 공압출 3D 프린팅기반의튜브형 3차원다공성생체활성세라믹지지체제조기술조인환 *, 맹우열, 이정빈, 고영학. 고려대학교 We herein propose a novel way for manufacturing highly porous biphasic calcium phosphate (BCP) scaffolds with tubular structure with proper mechanical properties using rapid direct deposition of dual phase initial feed rod, which are consisted of a carbon black paste core with ceramic paste as a shell. This novel technique make full use of inherent propriety of methylcellulose (MC) polymer used as the binder in aqueous system for fabricating stable initial feed rod. This allowed samples with dual pore structure both 3-dementionally fully interconnect pore and interconnected tubular BCP channel (~350 mm outer diameter with ~150 mm channel diameter). The fabricated greenbodies were sintered to burnout the binder with carbon core and densify the BCP shell which allows sintered BCP scaffold has three dimensionally fully interconnected pore structures by rapid direct deposition process and hollow tube channel obtained by carbon core as the same time. Overall porosity of fabricated sample estimated as a value of ~73.2±0.9% which were consisted of a fraction of ~24p% as interconnected pore (dimension with 300x300x120mm) with fraction of ~46p% tubular BCP channel. Compressive strength also estimated as a value of ~12.3 MPa (parallel to the tube direction) and 7.1 MPa (normal to the tube direction). The biocompatibility of fabricated scaffold showed buy iv vitro cell tests. P2-S51-3 Ceramic/Camphene based Three-dimensional Coextrusion for Biomimetic Structure 세라믹캠핀기반압출법을이용한생체모방구조의지지체제조김종우 *, 고영학. 고려대학교 We report a novel ceramic scaffold structure with biomimetic dense/ channel using ceramic/camphene based by extrusion. As you know porous structure can give good favorable environment for bone ingrowth and excellent permeability. Biphasic calcium phosphate (BCP) powder comprises of hydroxyapatite and tricalcium phosphate (TCP) has good biocompatibility and bioactivity. Therefore, in this study, we decide to use the camphene-based freeze casting method in order to produce biomimetic graded porous biphasic calcium phosphate (BCP) ceramic. This design consists of dual layers as mimicking core-shell structure of natural bone, which is relatively dense part as a shell structure of natural bone, and porous part as an inner section, which is a biomimetic structure of nature human bone. To accomplish this, biphasic calcium phosphate (BCP)/camphene slurry with two different contents of 15 vol% and 40 vol% is first frozen uni-directionally in a 20 mm diameter mold with multi-layered extrusion through a reduction die with a cross section of 1mm diameter at room temperature. This simple processes enabled the formation of dense/channel scaffold with aligned pores by removing camphene dendrites in the biphasic calcium phosphate (BCP)/ camphene region. 182 한국세라믹학회

193 포스터발표 II P2-S51-4 Characterization of 3D Printed Scaffold using OCP- Alginate System OCP-알지네이트시스템에서 3D프린팅된골지지체의특성평가이승엽 *, 김석영. 영남대학교 3D printing technology is attracting in many industries. Especially the 3D printed porous scaffold is interested in the medical field due to the need for patient customization. There are many substances for the 3D printing of porous scaffold. Among them, octacalcium phosphate (OCP) is recently attracting attention because the OCP is regarded as a precursor of natural human bone tissue. Most 3D printing methods are also required high temperature treatment to obtain high compressive strength and to remove binders. In this study, porous OCP bone scaffold fabricated through 3D printing process without sintering process. OCP slurry containing 1 wt% alginic acid as a binder was printed with various powder/liquid (P/L) ratio). Printed scaffolds were cured in CaCl 2 solution, and dried in a oven at 40 C for an overnight. Properties of printing slurry, stability and strength of scaffold structure, and microstructure of the strut after drying were investigated. Coating of OCP powder by calcium alginate chelate was evaluated for the dissolution test and in vivo / in vitro tests. P2-S51-5 Synthesis and Characterization of a Light Curing Al 2 O 3 Suspension 광중합성 Al 2 O 3 서스팬션의합성및특성연구류국현 1*, 김응수 2, 조우석 2, 이종흔 1. 1 고려대학교, 2 한국세라믹기술원본연구에서는광경화공정에적용가능한알루미나슬러리를제조하여 DLP프린터로 circle형상의 3차원구조물을출력하였다. Al 2 O 3 입자에 silane coupling agent를이용하여코팅하고 monomer를부착시켜안정한슬러리를제조하였다. 안정화시킨 Al 2 O 3 슬러리에광개시제를첨가하여광경화프린팅에적용가능한최종슬러리를만들었다. 먼저, 슬러리의안정성확인을위해 Turbiscan 측정을진행하였다. 측정한결과로 TSI (Turbiscan Stability Index) 는상대적으로낮은 2의값을보였다. 다음으로 Al 2 O 3 세라믹슬러리의점도및유변학적특성을확인하기위해 Rheometer를이용했다. 슬러리는 shear thinning 특성을보이며, Oscillation sweep 측정을통해 elastic modulus의특성을나타냈다. 마지막으로슬러리의광경화특성테스트를위해 Photo-DSC를이용하여 P.I 첨가량 (0.1, 1, 3%) 을노광시간 (5, 10, 20, 40, 80s) 에따른측정을통해광경화엔탈피값이 1% > 3% > 0.1% 순으로증가함을알수있었다. DLP 프린터를이용하여 Al 2 O 3 슬러리의 3차원프린팅및프린팅특성을확인하였고, 프린팅된 Al 2 O 3 세라믹구조체를고온에서소성한후미세구조를분석하였다. P2-S51-6 Fabrication of α-tcp/cellulose 3D Fibrous Scaffold and Cellular Activities for Bone Tissue Regeneration 3차원섬유구조의 α-tcp/cellulose 제작및골조직재생을위한세포활성평가김민성 *, 김묘진, 이재윤, 김원진, 이지운, 김근형. 성균관대학교 Cellulose has been commonly used as a biomaterial fabricated into micro/nano fibers. The micro/nano-fibers are similar to the structure of extracellular matrix (ECM), and provide cells a ECM-like environmental condition promoting cell-adhesion and -proliferation. However, to build up layers for 3D structure with cellulose micro/ nano-fibers is difficult owing to low process-ability and low mechanical property. To compensate for these limitations, we designed a new composite structure, cellulose with α-tricalcium phosphate (α-tcp) which enhances mechanical property and cellular activities including osteoconductivity. To obtain a 3D bioceramic scaffold, electrohydrodynamic printing (EHDP) process was used for fabricating the structure consisted of micro/nanofibrous struts. This EHDP process was examined with various conditions such as the mixture ratio of α-tcp/cellulose, flow rate, and applied electric field. Then, using the fabricated cellulose/α-tcp composite scaffold, we cultured preosteoblasts (MC3T3-E1) to examine cellular activities and compare them with the control scaffold consisted of pure cellulose. As a result, the fibrous composite scaffold revealed higher cellular activities in cell-adhesion, -growth, and -differentiation. These results suggest that α-tcp/cellulose fibrous structure can be a promising tissue engineering scaffold for biomimetic structure similar to natural ECM and reasonable osteoconductivity. P2-S51-7 Fabrication of Biomimetic 3D Model Composed of Gelatin and Bioceramic Using Multi Nozzle 3D Printing System for Bone Tissue Regeneration 경조직재생을위한멀티노즐 3D 프린팅시스템을통한젤라틴 / 바이오세라믹혼합 3D 모델제작이지운 *, 김원진, 김민성, 여미지, 구영원, 김근형. 성균관대학교 Natural bone tissue is mainly composed of two different structures, compact and spongy bone. The compact bone has high mechanical properties and low porosity, while spongy bone has high porosity and relatively low modulus. In this study, α-tricalcium phosphate (α-tcp) and gelatin has been chosen as the mineral and organic material to mimic the natural bone composition, and multi nozzle 3D printing system was used for the fabrication of concentric cylindrical 3D scaffold. To mimic the natural bone structure, inner (spongy) and outer (compact) cylinders were differently designed. The inner cylinder was fabricated in a mesh structure with macropores, while the outer cylinder was dense without macropores. To evaluate the physical properties of the compact and spongy bone, various weight fraction of gelatin (5, 10, 15, 20 and 25 wt%) was used, while the volume fraction of α-tcp was fixed at 80 v/v%. Also, preosteoblasts (MC3T3-E1) were cultured on the biomimetic 3D model to evaluate biocompatibility, cell proliferation, and differentiation. Based on the physical and cellular responses of the biomimetic model, we optimized the ratio of inner and outer diameter of the bone-mimicking scaffold. P2-G8-1 Analysis of Thermal Behavior of Knife Materials for High Speed Packing Machine and Stress Distribution according to Knife Edge Angle 고속포장기계용나이프재질의열적거동및칼날각도에따른나이프응력분포해석김민호 1*, 서영진 2, 김정웅 1, 신재오 3, 유관영 3. 1 ( 재 ) 한국화학융합시험연구원, 2 금오공과대학교, 3 나이프코리아 ( 주 ) 포장기계용나이프는포장기계에장착되어포장필름을절단해주는역할을하고있으며, 포장산업의발전으로포장기계의속도가점차고속화되고있는추세이다. 이러한이유로많은업체들이분당 200타급이상의고속포장기계를개발하고있으며, 이를기술적으로뒷받침할수있는포장기계용나이프의개발이요구되어지고 한국세라믹학회 183

194 2018 년한국세라믹학회춘계연구발표회 있는실정이다. 이에, 기존기술의한계와문제점을극복하고변화하는시장및고객의 Needs 를반영할수있는분당 200 타급이상의고속포장기계용초경본딩나이프를개발하고자한다. 초경본딩나이프의경우. 이종의재질이본딩에의해구속되기때문에나이프의열적환경하에서사용시이종재질의서로다른열팽창계수로인하여휨이나변형이발생할가능성이있다. 따라서본연구에서는열적환경노출에의한이종재질간의변형정도및경향성을파악하기위하여열변형해석을수행하였으며, 추가로나이프의날각도에따른응력분포및경향성을분석하여보았다. 후기 : 본연구내용은중소벤처기업부에서시행한 2017 년도산학연협력기술개발사업 ( 산연전용 ) 의지원을받아수행한연구개발내용입니다. ( 과제번호 : C ) P2-G8-2 Study of Neutral Electroless Plated Ni-alloy Layer on Aluminum 알루미늄기판위의중성무전해도금된니켈합금층에대한연구이연승 *, 나사균. 한밭대학교전자패키징에서플립칩본딩은칩을접속하기위한기술중하나로, 솔더를사용해칩간접합을하는방식, 그리고솔더를사용하는대신금속범프를세우고전도성볼이함유된접착필름을칩간결합에사용하는방식이있다. 금속범프를형성하는방법으로는일반적으로전해금도금이나무전해니켈도금법이많이사용되는데무전해니켈도금법은저렴한비용, 빠른증착속도, 알루미늄배선위에만의선택적도금이가능하다는장점을가지고있다. 하지만무전해니켈도금의경우, 현재까지는대부분강산 (~ ph 4.5) 의무전해 Ni-P 도금욕에서주로개발이이루어져왔다. 하지만, 고출력고효율소자부품으로접근하면서알루미늄기반기판에대해강알카리또는강산성용액에기판이손상을받게됨에따라, 중성근처에서의니켈도금이요구되고있다. 또한알루미늄패드표면에형성되어있는알루미늄산화막이니켈이환원되는것을방해하기때문에무전해니켈도금을하기위해서표면의산화층을제거하는 zincation 전처리과정이필요하다. 본연구에서는 zincation 과정을거쳐전처리된알루미늄패드표면의변화와함께, 전처리된알루미늄패드위에중성에서 Ni-P와 Ni-B 무전해금속층을형성하여, 형성된 Ni합금계의결정구조및전자구조에대해연구하였다. P2-G8-3 First Principles Study on Electronic Properties of CdSe Quantum Dots 제일원리계산을통한 CdSe 양자점의전기적특성연구송도형 *, 이재찬. 성균관대학교 Quantum dots (QDs) have been actively studied for basic physical properties and interaction with other materials due to their special optical and electric properties. In particular, we studied the change of the energy band structure of CdSe QDs under the external electric field in order to consider the situation where the electric characteristics change due to the effect of the electric field generated when the CdSe QDs is used in the device. We found that, the external electric field changes the energy band structure of CdSe QDs, due to the internal dipole moment. In this study, Density Functional Theory (DFT) was used to investigate the energy band structure and the process of change with an external electric field. It was found that the external electric field caused the change in the electronic band structure of CdSe QDs in wurtzite structure. Cd n Se n QDs (n = 4, 6, 13, and 33) with diameters from to 1.38 nm were investigated from 0.1 to 0.1 V / Å. When the electric fields larger than 0.01 V/Å in all directions were applied to the QDs, the energy band gap of the QDs became narrower than that without the electric field. P2-G8-4 Thickness-Dependent Dielectric Properties and Stability of BaTiO 3 Slabs: First-Principles Calculations 티탄산바륨슬래브두께에의존하는유전특성과안전성 : 제1원리계산변상균 *, 이재찬. 성균관대학교 Barium titanate (BaTiO 3 ), a high-k material, is sensitive to thickness. This is because the ferroelectric property disappears as the thickness of BaTiO 3 becomes thinner. The surface of BaTiO 3 with perovskite structure generates an electric field opposite to the direction of dielectric polarization by the surface effect. The thinner the BaTiO 3 Slabs, the influence of the electric field generated from the surface charge is stronger, making it difficult to maintain the inherent dielectric polarization. We investigated different thickness of BaTiO 3 Slabs and compare their respective dielectric constant with bulk BaTiO 3. We adapted BaTiO 3 Slab structure with different thickness and found that when the slab thickness is thicker, the dielectric properties are similar to bulk case, but when the slab thickness decreases, dielectric constant become sensitive, and differ from bulk case. We tried to relate this with surface relaxation phenomena, and studied different surface termination including symmetric with both TiO 2 and BaO termination, and asymmetric cases. We found that surface reaction depending on surface termination is involved to diversify dielectric constant of thinner BaTiO 3 Slab from its bulk phase. P2-G8-5 Systematic Use of GKA Rules to Study Parallel Spin Interaction of Heavy Fermions 중페르미온의강자성스핀상호작용에대한 GKA 규칙을사용한시스템적연구 Rahman MD Mokhlesur *, 이재찬. 성균관대학교 Localized spins are known to align in antiferromagnetic orientations. While there is a long-term investigation to correlate localized electrons spin parallelly, some recent experiments show the possibility of such cases, enabling us to have ferromagnetic insulators (FMI). By time we now have several different compounds showing FMI characteristic, but still we are far from getting user friendly room temperature FMI and to understand their mechanism theoretically. One way of understanding FMI is superexchange interaction (SI), we tried to find a way to design new FMI using this SI method, which is developed over time by different well-known researchers and known as Goodenough-Kanamori (GKA) rules. We adapted heavy fermion system and studied their f-orbital occupancy and that occupied orbital s symmetry with ligand s orbital symmetry to find interaction type (Ferromagnetic or anti-ferromagnetic) by means of density functional theory using GGA-PBE +U scheme, and showed a way to enhance ferromagnetic interaction, which could enlighten the search of room temperature FMI, and the physics behind it. P2-G8-6 Piezoelectric Transition Metal Dichalcogenides Heterogeneous Bilayer: Ab-initio Study 184 한국세라믹학회

195 포스터발표 II 전이금속이칼코겐화물이종이중층구조의압전성에대한제일원리연구정봉욱 *, 박재영, 이재찬. 성균관대학교 Two dimensional transition metal dichalcogenides semiconducting hexagonal phase monolayer (1H-TMDCs) exhibit a unique combination of atomic-scale thickness, and favorable electronic and mechanical properties, which make them interesting for applications in piezoelectric (PE) energy harvesting. However, 1H-TMDCs are not suitable for actual piezoelectric devices due to their insufficient mechanical durability. Although an enhanced mechanical endurance can be achieved in homogeneous TMDCs multilayers, they can not be used for PE because of inversion centrosymmetry. Here, we design and demonstrate LEGO like stacked van der Walls (vdw) heterogeneous TMDCs bilayers which are consisted by 1H-TMDCs to remove inversion centrosymmetry. The systematical studies by first principle''s calculations performed for combination of 1H-MX 2 (M = Mo, W; X = S, Se) monolayers by the difference stacking modes. We found that chalcogen combined heterogeneous structures (MX''2 / MX''''2, M''X'' 2 /M''''X''''2) have a great potential as a PE device since they have a high piezoelectricity. Our findings will open pathway to apply PE generator. P2-G8-7 Evaluation of Dynamic Young''s Modulus and Poisson''s Ratio Measurements by Impact Method 충격가진법을이용한형상별동탄성및프아송비측정평가서대석 *. 선문대학교 Due to the extensive long service life for automotive components, the behavior of very high cycle fatigue (VHCF) is gained attention. For this reason, the newly developed piezoelectric ultrasonic fatigue test (UFT) system by Mbrosiatec Co. Ltd 1) is used to investigate the high cycle fatigue (HCF) strength of Engineering Plastic (EP). The plateshaped specimens are investigated in the range of 10 6 to 10 9 cycles at room temperature under completely reversed loading conditions R = 1. Scanning electron microscopy (SEM) analysis revealed that failures occur right up to the high cycle regime, with the fractures being found to initiate from the surface unlike in EP. In addition, SEM micrographs showed that micro-dimples were transformed. Additionally, this test method can be applicable on commercialized parts of automotive and rail road which are required high cycle fatigue. In addition, SEM micrographs showed that micro-dimples were transformed into EP fracture. P2-G8-8 The Investigation of Crystal Structure Analysis and Entropic Stability of AgBi 2 I 7 AgBi 2 I 7 결정구조분석및엔트로피안정성에대한연구도경연 *, 김성훈, 이동화. 포항공과대학교 Ag-Bi-I 시스템은하이브리드페로브스카이트를대체할무연광활성물질로연구되고있다. 실험결과밴드갭은 1.6 ev에서 1.8 ev이며광전효율은 4.3% 까지보고되었다. 하지만안정상의조성및결정구조에대해서는상반된의견들이논의되고있다. 지금까지보고된조성으로는 (Ag 3 BiI 6, AgBiI 4 ) 또는 (Ag 2 BiI 5, AgBi 2 I 7 ) 가있다. 각조성의첫번째는 R3-m, 두번째는 Fd3-m 공간군을가진것과, 금속양이온의위치가부분적으로채워졌음이알려졌다. 본연구는진화알고리즘에기반한 USPEX code를사용하여상평형실험에서얻은 AgBi 2 I 7 구조를간단히나타낼수있는결정구조를찾았다. 그리고찾아낸결정구조를기반으로대칭성을고려해 cation mixing으로나타날수있는결정구조를정리했다. 제일원리계산으로각결정구조의에너지와시스템의엔트로피를계산하였다. 계산한엔트로피로온도에따른 AgBi 2 I 7 의열역학적안정성이나타날수있다. 또한제시된결정구조로부터계산한결과와실험에서측정한밴드갭과온도에따른부분채움비율변화를비교할것이다. P2-G9-1 Phase Transition of Indium Hydroxide to Indium Oxide at Low Temperatures 저온에서의 indium hydroxide에서 indium oxide로의상전이최은경 1*, 이원준 2, 심광보 1, 김응수 2, 조우석 2. 1 한양대학교, 2 한국세라믹기술원 Indium hydroxide 분말이침전법으로제조되었다. 반응온도 (150 o C~250 o C) 와각반응온도에서의유지시간 (1 h~72 h) 이실험변수로사용되었다. 각각의제조된분말을 X-선회절분석기 (XRD) 와투과전자현미경 (FE-TEM), BET를통해입자크기, 미세구조및결정상을관찰하였다. 우리는침전법에의해제조된 Indium hydroxide 가열처리시저온에서온도와유지시간에따라어떻게 Indium oxide로상전이거동을하는지를고찰하였다. 한국세라믹학회 185

196 2018 년한국세라믹학회춘계연구발표회 P2-S43-1 Synthesis and Optical Property of ZnTe/ZnSe (core/ shell) Type-II Quantum Dots ZnTe/ZnSe (core/shell) type-ii 양자점의합성및광학특성김미성 *, 방지원, 구은회. 한국세라믹기술원 Properties of colloidal semiconductor quantum dots (QDs) attract great interest for their emitting diodes and bio imaging probes. because of their novel optical and electrical properties from the threedimensional confinement. We synthesized non-toxic colloidal ZnTe/ ZnSe (core/shell) type II quantum dots by pyrolysis method. Because of the unique Type-II characters, their emission can range over an extended wavelength regime, showing photoluminescence (PL) from 450 nm to 650 nm. ZnTe/ZnSe (Core/Shell) QDs can be further passivated by ZnS layers for enhanced chemical stability. The ZnTe/ ZnSe/ZnS (Core/innershell/outershell) QDs exhibited remarkable luminescent properties with high PL quantum efficiency and narrow full width at half-maximum. In addition, we synthesized ZnTe/ZnSe (core/shell) QDs with thick ZnSe shell based on cation exchage reactions, starting from CdTe/CdSe QDs. The heavy metal free ZnTe/ ZnSe could be relevant for opto-electronic applications such as in displays, light emitting diodes and bio imaging probes. P2-S43-2 Fabrication of Polyaniline-carbon Nano Composite for Application in Sensitive Flexible Base Sensor 유연한염기센서에적용하기위한폴리아닐린 - 탄소나노복합체의제조김도훈 *. 전자부품연구원 As the safety has been emerged as a major interest in chemical industry facilities, there have been many researches about sensors for detecting hazardous chemicals. In this study, especially, the sensor for detecting an acid was developed and evaluated. The sensor was composed of carbon materials and polyaniline, which is a conductive polymer. The candidate carbon materials for sensor such as graphite and graphene nano platelet were examined. When graphene nano platelet was used, it showed insensitive reactivity to basic material. Also sensor films can better overcome sensor errors in moisture and water when using graphite than GNP. Finally, it was confirmed that the graphite was the best carbon material for the base sensor and it was coated on PET to enable flexible sensor. P2-S43-3 Polymer-encapsulated CsPbBr 3 Quantum Dots for Enhanced Stability in Qqueous Phase 수용액상에서안정성이확보된고분자-페로브스카이트나노캡슐. 이시맥 1*, 이윤기 2, 방지원 1. 1 한국세라믹기술원, 2 경상대학교열분해 (pyrolysis) 방법을이용하여합성된무기페로브스카이트 (CsPbX 3 : X = Br, I, Cl) 양자점은조성및크기조절을통해가시광영역대에서높은효율및색순도로발광하는특성을가지고있다. 이와같은뛰어난발광특성을통해레이저, 디스플레이, 광센서와같은광소자에응용이가능하다. 하지만, 무기페로브스카이트양자점은수분및공기에안정성이매우낮으며, 특히수용액상에서분산안정성및광안정성이확보되지않아바이오센서및바이오이미징프로브의응용에는한계가있다. 본연구에서는유화 / 용매증발법을이용하여소수성용매에분산되어있는 CsPbBr 3 페로브스카이트양자점을생체에적합한양친성고분자로캡슐화하여수용액에서분산안정성및광안전성이유지되는 CsPbBr 3 나노복합체를제조하였다. 수용액에분산된 CsPbBr 3 페로브스카이트나노 캡슐은약 55 nm 크기를가지며, 우수한콜로이드안정성을보인다. 또한, CsPbBr 3 페로브스카이트나노캡슐은 520 nm 에서약 20% 의발광효율을보이며, 발광파장및색순도가유지됨을확인하였다. 본연구에서개발한수용액에분산된 CsPbBr 3 페로브스카이트나노캡슐은바이오센서및바이오이미징프로브등에응용이가능할것으로기대된다. P2-S43-4 Analysis and Synthesis of ZnS Inorganic Phosphor for Polymer Dispersion Liquid Crystalline (PDLC) Smart Window 고상반응법으로제작한자체발광가능한고분자분산액정 (PDLC) 스마트윈도우용 ZnS계무기형광체합성및분석김은미 1*, 오정표 2, 강성찬 2, 강지연 1, 허기석 1. 1 한국생산기술연구원, 2 전남대학교스마트윈도우 (Smart Window) 는전류의흐름에따라투과도가변하는물질을통해외부에서유입되는태양광의투과율을자유롭게조절하여, 에너지손실을줄이는동시에에너지효율을향상시켜사용자에게쾌적한환경을제공하는감성과기능을모두만족시키는윈도우를말하며, 전기변색방식 (Electrochromic,EC) 과고분자분산액정방식 (Polymer dispersed liquid crystal, PDLC) 의스마트윈도우가대표적인기술로인식되고있다. 고분자분산액정 (PDLC) 형스마트윈도우는두장의투명전극사이에고분자분산액정이분산되어있는형태로, AC 전압을인가하게되면투명 / 불투명기능을하게되며구동전압과 ON 투과율은고분자분산액정의두께에영향을받기때문에적당한두께간격을유지하기위해간극용 spacer 를사용한다. 이연구에서는자체발광기능이가미된고분자분산액정 (Polymerdispersed liquid crystal; PDLC) 스마트윈도우를제작하기위해 PDLC에혼합가능한무기형광체를합성 / 제작하였다. ACPEL (Alternating current powder electroluminescence) 에활용되는소재인 ZnS계무기형광체는 PDLC형스마트윈도우에 spacer 대용으로사용하기적합하며, 발광특성이좋은고휘도형광체제작을위해 ZnS 분말에고상반응법으로 Cu를도핑하는방법을사용하였다. 제작된 ZnS:Cu 형광체의구조분석을위해 XRD(X-ray diffraction) 분석, 입자크기를확인하기위해입도분석을하였고, 발광특성분석을위해 PL(Photoluminescence), EL(Electroluminescence) 을측정분석하였다. P2-S43-5 CuO Immobilized Silica Nanoparticles for Tungsten Oxidation via a Heterogeneous Fenton-like Reaction 구리산화물이임베디드된실리카나노입자를이용한텅스텐산화효과 SungWook Cho *, Kijung Kim,Taeseup Song. 한양대학교 Copper oxide nanoparticles (NPs) were grown on the surface of silica NPs to increase the hydroxyl radical production over a broad ph range. In this study, we have investigated the differences of the hydroxyl radical productions between conventional Fenton reaction and heterogeneous Fenton-like reaction using CuO embedded silica NPs in a ph range from 3 to 7. HR-TEM and XPS were performed to confirm the growth of CuO NPs on the silica NPs. To analyze the hydroxyl radical productions, the UV-visible measurements were performed in a ph range from 3 to 7. The electrochemical behavior of the tungsten films was evaluated by potentiodynamic measurements. To support those results, Chemical Mechanical Polishing (CMP) process was performed. In conclusions, we found that the heterogeneous Fenton-like reaction using immobilized CuO NPs 한국세라믹학회

197 포스터발표 II increased the hydroxyl radical production regardless of ph values. Furthermore, the high removal rates of tungsten films also observed corresponded to the results of the high oxidation of tungsten films. P2-S43-6 Influence of BN Precursor Solution on Electro-spun BN Nanofiber 전기방사된 BN 나노섬유에대한 BN 전구체용액의영향이종혁 1*, 전명표 1, 정영근 2. 1 한국세라믹기술원, 2 부산대학교 Three different BN precursor solution were prepared using ultrasonic, rod-sonic and ball milling method and electro-spun to fabricated BN fibers. BN precursor solution is consisted of PVP (PolyVinylPyrrolidone, Mw~1,300,000), BN nanoparticle (70 nm) and ethanol as a solvent. The solutions were measured for their viscosities before electro-spinning, electro-spun and dried at 80 o C for 12 hours. The dried fibers were heat treated at various temperatures to produce BN nanofibers and investigated with XRD, FE-SEM and TG- DTA. Dispersion of BN nanofibers fabricated by electro-spinning, In the case of poorly dispersed precursor solution of BN particles, the formation of uniform BN fibers was interfered by the agglomerated BN particles. P2-S43-7 3D-printed Origami Electronics Using Percolative Conductors 퍼콜레이션기반의전도체를이용하여 3차원인쇄된접을수있는전극제조조예진 *, 정두원, 이정오, 최영민, 정선호. 한국화학연구원 Recently, three-dimensional (3D) printing has garnered tremendous amounts of attention in various applications. In this study, we suggest a facile means of creating 3D-printed foldable electrodes on papers via the direct printing of composite pastes consisting of a metallic filler and a thermoplastic elastomer. The 3D-printability of the prepared composite pastes is investigated depending on the rheological properties. The mechanical bending/folding stability levels of the printed electrodes are evaluated to judge the possibility of realizing 3D-printed origami electronics. It is demonstrated that the 3D-printed composite electrodes are applicable to various origami electronics, including electrical circuits, strain sensors and electrochemical sensors. P2-S43-8 Development of Printable Composite Material for High Conductivity Elongated Electrode Capable of Nozzle Printing 노즐프린팅이가능한고전도성연신전극용프린터블복합소재개발이회성 *. 한국화학연구원웨어러블하며스트레처블한전극소재는사물이나옷등에직접적으로부착이가능하다. 또한, 유연하여평면뿐만아니라곡면에도적용할수있어다방면으로응용이가능하다. 최근에는이러한장점을가진소재에대한연구가활발하게이루어지고있다. 하지만, 전극소재를다양한방향으로휘거나당길경우, 금속입자간에연결이끊어지기때문에전도성이떨어지는문제가있다. 본연구에서는은플레이크, 탄성체, 화학적첨가제의조합을통해높은전도도를가지는동시에우수한연신특성을가지는프린터블전극소재를디자인하여, 스트레처블전극의기본적인요구특성을만족시키고자한다. 탄성체대비은플레이크조성, 화학적첨가제의조성및 건조조건에따른전기적특성및연신특성을고찰하여최종물성을최적화하고자한다. P2-S43-9 Stretchable and Adhesion-Force-Adjustable Reverse- Micelle-Induced Films for Epidermal mouse patch Devices 부착형마우스패치장치용신축성및접착력조절형역방향미셀유도필름황유진 *, 김준형, 이수연, 정선호, 최영민, 정성묵. 한국화학연구원 Recently, as the interest of flexible electrode has increased, researches for using it as a wearable device in various fields are being actively carried out. In order to develop a substrate that can control elasticity and stickiness, a PDMS (polydimethylsiloxane) -based elastomer substrate with a soft / sticky property and a hard property is developed by forming a reverse-micelle in PDMS. In this study, we investigated the application of this substrate to the mouse Tattoo device, which is a stretchable and attachable skin to the skin. Active layers were fabricated using various materials such as paper and cloth which can be easily obtained for practical application, and a bottom layer, which is made of a reverse-micelle PDMS film, was fabricated.. The active layer of the substrate was pasted with silver flake to develop the electrode material for screen printing. It was also confirmed that the change in electrode resistance was small as 100% stretching was performed. In addition, we confirmed that flexible electrode can be used as Mouse Tattoo, which is an epidermal device, in conjunction with Arduino by confirming constant capacitance value change according to touch. P2-S43-10 Elastomer for Epidermal Electronics with Adjustable Adhesion Force and Stretchability by Reverse- Micelle-Induced Process 역미셀공정을이용한접착력과연신조절이가능한부착형전자소재제작김준형 *, 정선호, 이수연, 최영민, 정성묵, 황유진. 한국화학연구원 The epidermal electronics should have mechanical properties similar to adhesion to the skin. Thus, most skin devices are now ultrathin. However, this form requires a complicated and expensive manufacturing process and makes the device disposable. Thick forms help overcome these limitations and require greater adhesion, while conventional stretch elastomers are not sticky, but sticky elastomers are less elastic and less durable. To keep it sticky, molecules in the material should have chains that are joined together very weakly, but this also weakens the material. This study describes the reverse micelle induction process to solve this problem by making a weakly linked region array in a polydimethylsiloxane(pdms)-based elastomer. The area can be formed and adjusted simply by adding an emulsifier and an inhibitor. In addition, it is excellent in durability (stable up to 10,000 times of stretching), and can be reused even adhered well to human skin. P2-S43-11 Preparation of Mesoporous Silica Submicron Particles by Metal Cation Template in Acid-free Condition 중성조건에서금속양이온템플릿을이용한서브미크론메조포러스실리카제조박중규 *, 이한슬, 조선복, 이혜선, 장정호. 한국세라믹기술원 한국세라믹학회 186-2

198 2018 년한국세라믹학회춘계연구발표회 This study discusses the synthesis of mesoporous silica in an acid-free condition using a metal cation template. Traditional mesoporous silica, such as SBA-15, was difficult to control shape and size without the use of acids. However, by using metal catalyst such as copper (Cu), synthesized mesoporous silica particles were achieved size of submicron due to polymerized micelle of the triblock copolymer was able to control and also high specific surface area was achieved as much as greater than 700 m 2 /g. For morphological characterization, Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) were used. P2-S43-12 Mass Production of Mesoporous Silica in Acid-free Condition 중성화조건에서메조포러스실리카양산화박중규 *, 조선복, 이혜선, 장정호. 한국세라믹기술원 This study discusses the mass production of mesoporous silica in an acid-free condition. Mesoporous silica, such as MCM-41 and SBA- 15, had a low synthesis yield, low reproducibility of material properties, and high production cost. To solve this problem, a large amount of mesoporous silica had been synthesized at a high yield by using a 500 L hydrothermal reactor at one time. The synthesized mesoporous silica achieved about 30% yield of the silica precursor, and also had a particle size of less than 10 microns and achieved a BET surface area of 400 m 2 /g. For the morphological characterization, Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) were used. P2-S43-13 Solution Processed Flexible and Transparent Conducting Electrode with Embedded Copper Mesh 용액공정을이용한구리가박힌메쉬형태의투명전극한설희 1*, 김주영 1, 류병환 1, 정선호 1, 최지훈 2, 최영민 1, 이수연 1. 1 한국화학연구원, 2 충남대학교 Transparent conducting electrodes (TCEs) are critical component of optoelectronic devices including flat panel displays, touch screen displays, solar cell, and organic light-emitting diodes (OLED). Although indium tin oxide (ITO) commonly used for this purpose, their suitability for next-generation flexible optoelectronic devices has been limited due to the brittleness of the film, low abundance of the material, low infrared transmittance, and the inability to perform hightemperature processes on plastic substrates. Recently, great efforts have been attempted to develop a new transparent electrode which can be mass-produced at a low cost, large area and excellent flexibility for a flexible electronic device. Here, we report cost-effective and solution-processable metallic mesh TCEs consisting of a Cu-mesh embedded in a flexible PDMS substrate. Our Cu-mesh TCEs provide a low sheet resistance Rs< 1 Ω/sq and a high transmittance T > 96 % at 550nm, as well as extremely high figures of merit, reaching up to , which are the highest reported values among recent works. This fabrication technique enables the mass production of large-area flexible TCEs, and the stability and high performance of mesh electrodes in high bending stress suggests they have high possibility for application in smart displays and flexible transparent heater. P2-S43-14 Fabrication of Glass Door to Prevent Freezing Condensation 냉동고결로방지를위한 glass door 제작최창식 1*, 김진호 1, 현승균 2. 1 한국세라믹기술원, 2 인하대학교최근각종냉장, 냉동식품을전시하고보관하는용도로다양한크기와형태의냉장, 냉동고의사용이높아지고있다. 이러한냉동고의장착되는 Glass door는 40이상의높은온도차로인해표면에결로가발생하며, 미세한결로도내부의진열상품을식별하는데큰지장을주기때문에이를최대한방지하기위하여여러가지연구가활발히진행되고있다. 본연구에서는 sol-gel 법을이용하여유무기하이브리드용액을제조하였고, AgNW를혼합하여냉동고결로방지코팅을진행하였다. P2-S43-15 Sticky PDMS Controlled of Crosslinking Density by Vinylated Silica vinyl기를포함한실리카에의해가교밀도가조절된점착성 PDMS 신은애 *, 이상봉, 김형진, 이창기. 한국생산기술연구원 Low adhering ability of polydimethylsiloxane (PDMS) is one of the biggest huddle in spite of their good water-repellence resulted from their siloxane and methyl groups. We controlled crosslinking density of PDMS by incorporating vinylated silica nanoparticles and made sticky PDMS. PDMS included vinyl-functionalized silica showed higher adhesion force more than about 400% compared to that of pure PDMS or PDMS added pure silica. In swelling test, vinyl silica-added PDMS show higher swelling ratio and lower gel fraction compared to that of PDMS and silica-added PDMS. We suggest that vinyl groups in silica make chemical bonding with hydrosilane groups in PDMS. As a result, effective network chain density of PDMS decrease and their surface became sticky. P2-S43-16 Characteristics of Silica and Cellulose Nanofiber Organic-Inorganic Hybrid Composite Silica-CNF 유 무기하이브리드복합재료의특성이준성 *. 네오플램졸-겔법으로제조된실리카는우수한열적성질및낮은유전상수를가져서촉매, 주방용품, 전자재료등에많이이용되고있다. 하지만실리카는쉽게깨지는성질을가지고있어이런단점을보완하고자유기물질과의하이브리드복합재료를제조하였다. 그중에서도 CNF는나무에서추출된물질로써자연에서쉽게얻을수있는풍부한친환경성유기물질이다. 또한, 물에잘분산되며유연성을가지고있어취성을가진실리카의단점을보완할수있다. 본연구에서는콜로이드실리카를졸-겔법으로제조함에있어건조시에발생하는균열을줄이기위해 CNF와의복합화로 Silica-CNF 유-무기하이브리드복합재료를제조하였다. 제조된완제품의특성은 FE- SEM, FT-IR로측정하였고유연성은 Solid analyzer를이용하여분석하였다. P2-S43-17 Sythesis and properties of SiO 2 -PDMS hybrid coating for cookware 주방용품용 SiO 2 -PDMS 하이브리드코팅막제조및특성연구김민희 *. 네오플램주방용품에널리사용되는 PTFE 코팅의유해성논란으로인하여새로운코팅의개발이요구되고있다. 이에본연구에서는세라믹과 PDMS를결합하여하이브리드코팅막을제조하여. 세라믹코팅의비점착성및박리내구성을향상시켰다. MTMS(Methyltrimethoxysilane) 한국세라믹학회

199 포스터발표 II 를전구체로사용하여, 가수분해 - 축합반응을통해세라믹구조를형성하였고, PDMS(Polydimethylsiloxane) 는양말단에 OH 작용기가있는변성실리콘오일을사용하였다. 세라믹과 PDMS 의화학결합을위해유기티타늄화합물을촉매로사용하였다. TEM 과 FE-IR 을통하여제조된코팅액의무기 - 유기결합상태를확인하였으며, SEM 을통해미세구조를관찰하였다. 하이브리드코팅의비점착성과박리내구성은 CMA(Cookware Manufacturers association) 에규정하는방법으로접촉각및 soak 테스트로확인하였다. P2-S43-18 Multi-functional Polymer Nanocomposites Reinforced by 3D Continuous Ceramic Nanofillers 3차원나노구조의세라믹필러재료를이용한강화된다기능성고분자복합체안창의 *, 현가예, 조동휘, 함영진, 전석우. 한국과학기술원 Polymer nanocomposites have relatively high yield strength, elastic modulus, and toughness that therefore are widely used as functional coating and films for optoelectronic applications. Although the mechanical properties are enhanced with increasing the fraction of nanofiller inclusion, there generally is an upper limit on the amount of nanofiller inclusion because the aggregation of the fillers in the polymer matrix, which typically occurs, degrades the mechanical and/ or optical performances above 5 vol% of inclusions. Here, we demonstrate an novel polymer nanocomposite composed of a uniformly-distributed three-dimensional (3D) continuous ceramic nanofillers, which allows for extremely high loading (~19 vol%) in the polymer matrix without any concern of aggregation and loss in transparency. The fabrication strategy involves conformal deposition of an Al 2 O 3 nanolayer with a precise control in thickness that ranges from 12 to 84 nm on a 3D nanostructured porous polymer matrix followed by filling the pores with the same type of polymer. The 3D continuous Al 2 O 3 nanolayers embedded in the matrix with extremely high filler ratio of vol% improve compressive strength by 142% compared to the pure epoxy without Al 2 O 3 filler and this value is agreement with theoretically predicted strength through rule of mixture. These 3D nanocomposites show superb transparency in the visible (>85% at 600 nm) region and improved heat dissipation beyond that of conventional Al 2 O 3 nanoparticles dispersed nanocomposites due to the existence of a continuous thermal conduction path through the oxide network. This achievement will open up a new class of polymer nanocomposites that can be applied to mechanically reinforced, multifunctional films. P2-S43-19 Flexible Resistive Switching Device Enabled by Ag2Te Nanowire Film and Au Electrode through Monolayer Assembly 서호준 *, 문건대. 한국생산기술연구원 We demonstrated a resistive switching device based on ultrathin Ag 2 Te nanowire (NW) film and Au nanosheet (NS) electrode by employing a monolayer assembly technique for macroscale twodimensional structures. The ultrathin TeNWs (diameter 10 nm) are assembled on water surface as a form of monolayer and transferred to build up TeNW film on various substrates with any available size. An assembled TeNW film can be used as a template to transform into Ag 2 TeNW film through chemical transformation. The Ag 2 TeNW film device showed reversible resistive switching properties when the Ag composition of silver telluride NW achieves a certain composition in Ag x Te. Additionally, non-stoichiometric Ag 2+δ TeNW film shows increased On/Off ratio. For a flexible memory device, ultrathin AuNS (thickness 20 nm) was adopted as working electrodes, since thermally-deposited gold electrodes tend to go through cracks under strain. A paper-like flexibility of AuNS proved its ability as optimal electrodes of ultrathin Ag 2 TeNW film-based resistive memory devices. 한국세라믹학회 186-4

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212 Akhtar Jahan Siddiqa G4-4, P2-G4-7, P2-G4-9 AKRAM FAZLI S11-7, S11-8, S11-10 Alana F. Ogata S41-8 Alfian Noviyanto SS2-10 ALI HUSSAIN S11-8, S11-7 Altaf Ur Rahman S24-9 Amirhossein Hasani P1-S41-4 Amit Siddharth Sharma G3-8, G3-10, G3-14, G3-9, P2-G3-6, P2-G3-8, P2-G3-9 Andrew C. Kummel S42-4 Arifin Septiadi G3-10 Arunava Gupta P1-S41-5 Ashok Ugale P2-G4-17 Attaur Rahman SS2-3 Bukhari Syed Zaighum Abbas G3-6 Byung-Koog Jang S31-3 Byung-Koog Jang SS2-10 Chan Park P2-S24-7 CHEN ZHILEI P2-G3-15 Chi Linlin P2-G4-4 Chilinlin P2-G4-17 Deepam Maurya S11-5 Dong-Geun Shin SS2-10 Fei Chen SS2-9 Francis Malar Auxilia G4-10 Gaurav Jha S41-8 Gu Jian S32-9 Gul Rahman S24-9 Gun Hwan Kim S13-3 H, Han-Bo-Ram Lee S13-6 Haribabu Palneedi S11-11, P2-G1-11, G1-18, P2-G1-17 Heyon-Myong Lee SS2-10 Hua-Yao Li P1-S41-6 IPPILI SWATHI S43-6 Jamil S24-9, S24-8 Ji Hwoan Lee SS2-10 Jianwu Shi G4-9 Jin Joo Ryu S13-3 Jing Zhang P2-S31-6 Jun-Ge Liang P2-S11-11 Jun-Young Cho P2-S24-7 Kati G2-3 Kenji Shinozaki G6-7 Kiran Shinde G1-12 Kyu Hyoung Lee S24-9 Laura B Cook S51-6 LE GIA PHAN P2-S11-7 Lianmeng Zhang SS2-9 Linlin Chi G4-4, P2-G4-7, P2-G4-6, P2-G4-9 Liu Na P1-S42-11 Lyu Guanlin P2-S31-6, P2-S31-5 Mahesh Peddigari P2-G1-11 MALIK RIZWAN AHMED S11-10, S11-8, S11-7 Manik Eknath Bhosale P2-G4-6, P2-G4-4 Md Shahjahan kabir P1-G5-11 MERTAMANI RIESSA NANDA G5-7 Muhammad Habib G1-1 Muneaki Kurimoto S51-1 Myong Ho Kim S24-9 Myong-Ho Kim S11-7 Nasir Tuqeer P1-S42-17, P1-S42-14, P1-S42-16 Nguyen Minh Dat P2-G2-6 Nguyen Van Du S24-8, S24-9, S24-8 Nguyen Van Quyet S32-1 Nikolai S21-4 Parag Banerjee P1-S42-7 PARMAR NARENDRA SINGH P2-S23-3 Pipit G3-10, P2-G3-8, G3-9, G3-8, P2-G3-9 Pratim Biswas P1-S42-7 Qiang Shen SS2-9 Rahman MD Mokhlesur P2-G8-5 Rajaram Mane S43-14 Ramesh Raliya P1-S42-7 Reginald M. Penner S41-8 Rita Galvez P2-S24-8 Rosario Gerhardt S43-13 SALMAN ALI KHAN S11-7 Saqib Muhammad P1-S21-1 Seongwon Kim S31-3 Shahjahan P2-G2-9 Shaopeng Qiao S41-8 Shashank Priya S11-5 SIYAR MUHAMMAD P2-S24-7, P2-S24-8 Soonil Lee S11-7, S24-9, S24-8 Soshu Kirihara S51-9 Tae-Kwon Song S11-7 Tobin J. Marks S42-5 Toshiyuki Nishimura SS2-10 Venkatraju Jella S43-11 Vivian T. Chen S41-8 Wahid Muhamad FR G3-14, P2-G3-6 Weichen Hong SS2-9 Weon Ho Shin S24-9 Won-Jeong Kim S11-7 Won-Seon Seo S24-9 Woo Hyun Nam S24-9 Xiangyu Lu SS2-9 Yoonjoo Lee SS

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215 RM KAERI 700B KIMS KIMS 700B B A B A B KIST KIER 700B KIST 600A KICET KICET 700A KETI 600A KIMS 600A A KIMS 700A KIMS 700B

216 RM KIST KIST B B B A KICET KIMS 600B A KAIST 600B UNIST B KIMS Wuhan University of Technology A GIST KICET

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223 2018 한국세라믹학회추계학술대회및총회국제세라믹산업전 2018 년 11 월 14 일 ( 수 )~16 일 ( 금 ) / COEX, Seoul 일반세션 G1. 전자세라믹스 G2. 에너지환경세라믹스 G3. 엔지니어링세라믹스 G4. 나노융합세라믹스 G5. 바이오세라믹스 G6. 유리및비정질세라믹스 G7. 내화물및시멘트세라믹스 G8. 전산재료과학및재료분석 G9. 생활및전통세라믹스 발표분야 주제별심포지엄 심포지엄개최를원하시는회원 ( 비회원도가능 ) 또는부회는개최신청서를작성하여제출 서울특별시서초구방배로 76, 머리재빌딩 403 호 T ,

224 The Korean Ceramic Society 2018 년한국세라믹학회추계학술대회 심포지엄개최신청서 한국세라믹학회추계학술대회가 2018년 11월 14~16일 3일간서울 COEX에서개최됩니다. 이번학술대회에심포지엄을개최하고자하시는회원과각부회및세라믹관련연구그룹, 사업단의많은참여를바라며, 본개최신청서를작성하신후 6월 29일 ( 금요일 ) 까지학회이메일로송부해주시기바랍니다. 비회원님들의신청도환영합니다. 신청문의 : , ceramic@kcers.or.kr ( 국문 ) ( 영문 ) 조직위원장 : ( 이름 / 소속 ) 공동조직위원 : ( 이름 / 소속 ) 대표연락처 : ( 이메일 / 직장번호 / 핸드폰 ) 초청강연발표건수 : 일반구두발표건수 : 포스터발표건수 : 예 ) 초청강연으로만구성, 해외심포지엄과연계, 좌석수, 요청날짜등. 서울특별시서초구방배로 76, 머리재빌딩 403 호 T ,

225 한국세라믹학회시상안내

226 2018 Spring Meeting of The Korean Ceramic Society