Journal
NANO RESEARCH
Volume 3, Issue 2, Pages 126-137Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-010-1017-1
Keywords
Graphene; transmission electron microscopy (TEM); expanded graphite exfoliation; microwaves
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Few-layer graphene (FLG) sheets with sizes exceeding several micrometers have been synthesized by exfoliation of expanded graphite in aqueous solution of ammonia under microwave irradiation, with an overall yield approaching 8 wt.%. Transmission electron microscopy (in bright-field and dark-field modes) together with electron diffraction patterns and atomic force microscopy confirmed that this graphene material consisted mostly of mono-, bi- or few-layer graphene (less than ten layers). The high degree of surface reduction was confirmed by X-ray photoelectron and infrared spectroscopies. In addition, the high stability of the FLG in the liquid medium facilitates the deposition of the graphene material onto several substrates via low-cost solution-phase processing techniques, opening the way to subsequent applications of the material.
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