Journal
CARBON
Volume 49, Issue 8, Pages 2862-2868Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2011.03.021
Keywords
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Funding
- National Natural Science Foundation of China [11075076, 10775070, 10904065, 10974092, 11023002]
- National Key Projects for Basic Research of China [2009CB930501, 2010CB923401]
- Program for New Century Excellent Talents in University of China [NCET-07-0422]
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Few-layer graphene sheets were prepared by splitting expanded graphite using high-power sonication. Atomic-level calibrated scanning transmission electron microscopy was used to obtain efficient layer statistics, enabling optimization of the experimental conditions. This resulted in a two-step splitting mechanism in which the mean number of layers was first reduced to less than 20 by heating to 1100 degrees C and then to a few-layer region by a 5-min 10(4) W L(-1) - power-density sonication. Raman spectroscopic analysis confirms the above mechanism and demonstrates that the sheets are largely free of defects and functional groups. (C) 2011 Elsevier Ltd. All rights reserved.
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