Journal
JOURNAL OF NANOMATERIALS
Volume 2010, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2010/528235
Keywords
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Funding
- National Natural Science Foundation of China [20574025, 50373015]
- Natural Science Foundation of Fujian Province [E0820001]
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A top-down method was developed for producing colloidal dispersions of graphene sheets. Graphite nanosheets comprising hundreds of carbon layers were dispersed and gently ball-milled to exfoliate into graphene in a variety of organic solvents. After 30 hours of the shear-force-dominated grinding and a subsequent 4000 r.p.m. of centrifugation, single-and few-layer graphene sheets were readily prepared and homogeneously and stably suspended in the good solvent medium which possesses a surface tension value close to 40 mJ m(-2), such as in N,N-dimethylformamide, at a concentration up to 0.08 mg ml(-1), achieving a yield higher than 32.0 wt%. The graphene materials in the colloidal suspension were characterized using scanning and transmission electron microscopy and atomic force microscopy.
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