Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 137, Issue 3, Pages 984-990Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.11.012
Keywords
Fullerenes; nanostructures; electron microscopy; electrical conductivity
Categories
Funding
- NSFC [51173024, 50873021]
- SRFDP [20110075110009]
- Shuguang Plan [09SG30]
- Shanghai Leading Academic Discipline Project [B603]
- 111 Project [111-2-04]
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As one of the most promising candidates, graphene exhibits a potential application in post-silicon nanoelectronics. However, it is a key issue to produce high-quality graphene in large scale. Here, a facile method is demonstrated to produce graphene dispersions by exfoliation of expanded graphite in the co-solvent with N,N-dimethylformamide (DMF) and water. We confirm that the optimal ratio of DMF to water for graphene exfoliation is 9:1 (v:v) by means of UV-Vis absorption spectra. This exfoliation results in large flakes 2 gm in diameter, which can potentially be improved by adjusting the sonication power. The relatively perfect hexagonal structure of graphene is confirmed by Raman spectroscopy and the as-prepared graphene nanosheet film the as-prepared graphene nanosheet film possesses good electrical conductivity (similar to 8.3 x 10(3) S m(-1)). DC electrical transport phenomena for the deposited film of graphene nanosheets are well described in terms of conduction models for non-crystal semiconductor. This convenient approach provides an extensive route to prepare high-quality graphene nanosheets. (C) 2012 Elsevier B.V. All rights reserved.
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