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Production Of Few-layer Graphene By Supercritical CO2 Exfoliation Of Graphite

N. Pu, Chung-An Wang, Y. Sung, Yih-Ming Liu, M. Ger
Published 2009 · Materials Science

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Abstract In this study, the authors report a supercritical CO 2 processing technique for intercalating and exfoliating layered graphite. Few-layer graphene is produced by immersing powdered natural graphite in supercritical CO 2 for 30 min followed by rapidly depressurizing the supercritical fluid to expand and exfoliate graphite. The graphene nanosheets are collected by discharging the expanding CO 2 gas directly into a solution containing dispersant sodium dodecyl sulfate (SDS) to avoid restacking. Atomic force microscopy (AFM) shows that the typical graphene sheet contains about 10 atomic layers. This technique offers a low-cost, simple approach to large-scale production of pure graphene sheets without the need for complicated processing steps or chemical treatment.
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