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  • 09월 04일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Functionalization and chemical properties of graphene

2009년 9월 2일 17시 31분 07초
금11G6심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 11시 : 15분
물리화학 - Oral Presentation by Young Physical Chemists
저자 및
Sunmin Ryu, Li Liu1, Stephane Berciaud1, Melinda H. Han2, Michael Steigerwald1, Mark S. Hybertsen3, Philip Kim4, Tony F. Heinz4, Louis E. Brus1
Department of Applied Chemistry, Kyung Hee University, Korea
1Department of Chemistry, Columbia University, Korea
2Department of Applied Physics and Applied Mathematics, Columbia University, Korea
3Center for Functional Nanomaterials, Brookhaven National Laboratory, Korea
4Department of Physics, Columbia University, Korea

Atom-thick graphene membrane holds substantial potential for applications in future molecular-scale integrated electronics, transparent conducting membranes, nanocomposites, etc. To realize this potential, chemical properties of graphene need to be understood and functionalization toolkits are also required. To meet this need, surface chemistry of graphene has been explored by Raman spectroscopy, AFM and STM scanning probes. In the first part of the talk, two chemical reactions of graphene will be presented. Hydrogenation, the simplest basal plane functionalization, is highly reversible and strongly dependent on the thickness of graphene in the rate. Graphene sheets can be locally hydrogenated with a high spatial resolution. Thermal oxidation also proceeds at a higher rate for single layer than double layer graphene and triple layer graphene behaves like bulk graphite. The second part of the talk will illustrate the influence of underlying silicon dioxide substrates and ambient gases on properties of graphene. Raman spectroscopy shows that freestanding graphene is essentially charge-neutral implying that the “usual” hole-doping in supported graphene is mediated by oxide substrates. An STM study reveals that thermal annealing generates out-of-plane deformation of nanometer-scale wavelength and distortion in sp2 bonding on an atomic scale. Graphene deformed by annealing is found to be chemically active enough to bind molecular oxygen, which leads to a strong hole-doping. A possible form of oxides will be discussed.