期刊
LANGMUIR
卷 27, 期 15, 页码 9077-9082出版社
AMER CHEMICAL SOC
DOI: 10.1021/la201797h
关键词
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资金
- Science Foundation Ireland [07/IN.7/I1772]
- IRCSET
We describe three related methods to disperse graphene in solvents with concentrations from 2 to 63 mg/mL. Simply sonicating graphite in N-methyl-2-pyrrolidinone, fob lowed by centrifugation, gives dispersed graphene at concentrations of up to 2 mg/mL Filtration of a sonicated but uncentrifuged dispersion gives a partially exfoliated powder that can be redispersed at concentrations of up to 20 mg/mL. However, this process can be significantly improved by removing any unexfolaited graphite from the starting dispersion by centrifugation. The centrifuged dispersion can be filtered to give a powder of exfoliated few-layer graphene. This powder can be redispersed at concentrations of at least 63 mg/mL. The dispersed flakes are similar to 1 mu m long and similar to 3 to 4 layers thick on average. Although some sedimentation occurs, similar to 26-28 mg/mL of the dispersed graphene appears to be indefinitely stable.
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