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Fluorographene
Fluorographene (or perfluorographane, graphene fluoride) is a fluorocarbon derivative of graphene.〔''Properties of Fluorinated Graphene Films'' 〕〔 It is a two dimensional carbon sheet of sp3 hybridized carbons, with each carbon atom bound to one fluorine. The chemical formula is (CF)n. In comparison, Teflon (polytetrafluoroethylene), -(CF2)n-, consists of carbon "chains" with each carbon bound to two fluorines.
Unlike fluorographene, graphene is unsaturated (sp2 hybridized) and completely carbon. The hydrocarbon analogue to fluorographene is sp3 hybridized graphane. Similar to other fluorocarbons (e.g. perfluorohexane), fluorographene is highly insulating. Fluorographene is relatively inert, resembling polytetrafluoroethylene; however, it can be transformed back into graphene by reaction with KI under higher temperature.〔
==Preparation==
The material was first described in 2010 by Robinson ''et al''.〔 using graphene grown on copper foil exposed to xenon difluoride at 30°C. The group of Nair ''et al''.〔 started from cleaved graphene crystals on a gold grid also exposed to xenon difluoride, at 70°C. Also in 2010 Withers ''et al''. described exfoliation of fluorinated graphite (monolayer, 24% fluorination) and Cheng ''et al''. reported reversible graphene fluorination.〔''Reversible fluorination of graphene: Evidence of a two-dimensional wide band gap semiconductor'' S.-H. Cheng, K. Zou, F. Okino, H. R. Gutierrez, A. Gupta, N. Shen, P. C. Eklund, J. O. Sofo, and J. Zhu ''Phys. Rev. B'' 2010; 81, 205435 〕 The stoichiometric fluorographene (CF) was also prepared by chemical exfoliation of graphite fluoride by Zboril ''et al''. Zboril et al. also showed that the graphene fluoride can be transformed into graphene via graphene iodide, a spontaneously decomposing intermediate.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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