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Title: Property control of graphene by employing "semi-ionic" liquid fluorination
Authors: Lee, J.H.
Koon, G.K.W.
Shin, D.W.
Fedorov, V.E.
Choi, J.-Y.
Yoo, J.-B.
Özyilmaz, B. 
Keywords: add-atom engineering
covalent C-F bond
ionic C-F bond
semi-ionic fluorination
transition from insulator to graphene
Issue Date: 12-Jul-2013
Citation: Lee, J.H., Koon, G.K.W., Shin, D.W., Fedorov, V.E., Choi, J.-Y., Yoo, J.-B., Özyilmaz, B. (2013-07-12). Property control of graphene by employing "semi-ionic" liquid fluorination. Advanced Functional Materials 23 (26) : 3329-3334. ScholarBank@NUS Repository.
Abstract: Semi-ionically fluorinated graphene (s-FG) is synthesized with a one step liquid fluorination treatment. The s-FG consists of two different types of bonds, namely a covalent C-F bond and an ionic C-F bond. Control is achieved over the properties of s-FG by selectively eliminating ionic C-F bonds from the as prepared s-FG film which is highly insulating (current < 10-13 A at 1 V). After selective elimination of ionic C-F bonds by acetone treatment, s-FG recovers the highly conductive property of graphene. A 109 times increase in current from 10-13 to 10-4A at 1 V is achieved, which indicates that s-FG recovers its conducting property. The properties of reduced s-FG vary according to the number of layers and the single layer reduced s-FG has mobility of more than 6000 cm2 V-1 s-1. The mobility drastically decreases with increasing number of layers. The bi-layered s-FG has a mobility of 141cm2 V-1 s-1 and multi-layered s-FG film showed highly p-type doped electrical property without Dirac point. The reduction via acetone proceeds as 2C 2F(semi-ionic) + CH3C(O)CH3(l) → HF + 2C(s) + C2F(covalent) + CH 3C(O)CH2(l). The fluorination and reduction processes permit the safe and facile non-destructive property control of the s-FG film. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Advanced Functional Materials
ISSN: 1616301X
DOI: 10.1002/adfm.201202822
Appears in Collections:Staff Publications

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