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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Tailoring of the Physicochemical Properties of Graphene Nanosheet and Its Restacked Film via Controlled Reduction of Graphene Oxide Precursor

2014년 8월 28일 19시 39분 52초
INOR.P-256 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
조윤경, 김인영1, 김수진, 이영미, 황성주1,*
이화여자대학교 화학나노과학과, Korea
1이화여자대학교 화학·나노과학과, Korea
By controlled reduction of graphene oxide (G-O) precursor, we develop an efficient way of tailoring the physicochemical properties of reduced graphene oxide (rG-O) and its freestanding film. Tuning the reduction time is found remarkably effective in controlling the relative concentrations of epoxy, ether, and carboxylic acid groups, and the electrical conductivity of the rG-O. On the basis of a vacuum-assisted filtration method, the elastic freestanding rG-O films can be fabricated with all the present colloidal suspension of rG-O nanosheets having different degree of reduction. The surface morphology and crystal structures of the obtained films are tailorable with the change of reduction condition. Also, these rG-O films do not show a monotonous increase of electrical conductivity with elongation of reduction time. The electrical conductivity of the rG-O films becomes saturated after the reduction time of 30 min, demonstrating the rapid establishment of electron percolation paths. Of prime interest is that this rG-O film with the reduction time of 30 min displays a higher stability with respect to microwave heating than the other films, a result of the depression of microwave absorption by the increase of electrical conductivity and the reinforced dipolar interaction between restacked graphene by the presence of oxygenated functional groups. The control of reduction time is fairly effective in optimizing the functionality of rG-O nanosheets. The present work highlights the importance of controlled reduction condition not only in tuning the surface nature of rG-O but also in optimizing the transport property, surface morphology, and chemical stability of the rG-O freestanding films.