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  • 09월 08일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Insulator to Ionic Conductor Transitions in Microporous Metal-Organic Frameworks

2015년 8월 27일 15시 57분 35초
INOR.P-104 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (목요일) 11:00~12:30
저자 및
송유대, 박경세1, 윤민영*
가천대학교 글로벌캠퍼스 나노화학과, Korea
1군산대학교 화학과, Korea
Proton conducting materials have used in fuel cell, electrochromic (or electrochemical) sensors and electrochemical reactors. For better application, the conductivity should be tuned or controlled by external stimuli such as light, electric or magnetic field. However, most of the materials failed to demonstrate the conductivity control by the external stimuli. Recently, metal-organic frameworks (MOFs) and related porous materials have widely studied to control the proton conductivity using their modular nature and tunability. Here, we present a microporous metal-organic framework demonstrating humidity dependent conductivity change from insulator to superionic conductor. In low humidity, the MOFs behave like an insulator and the conductivity was detectable at ~ 60% RH, which was further changed to superionic conductor at > 90% RH. For better understanding of such a transition, vapor sorption of the MOFs was studied. Interestingly, three different vapor sorption states were found in the isotherms with a drastic vapor sorption increase; no vapor sorption, medium vapor sorption, and large vapor sorption. Thermogravimetric analysis (TGA) helps to estimate the adsorbed vapor amount and the vapor releasing temperature. Powder X-ray diffraction (PXRD) data demonstrates that the structure of MOFs is slightly changed by adsorption of water vapor. Therefore, we can conclude that the subtle changes in MOF structure by water vapor sorption induce a significant change in the proton conductivity. Details of our recent work will be presented.