学術雑誌論文 Efficient solvent systems for improving production of few-layer graphene in liquid phase exfoliation

荒尾, 与史彦  ,  Arao, Yoshihiko  ,  森, 文也  ,  Mori, Fumiya  ,  久保内, 昌敏  ,  KUBOUCHI, MASATOSHI

118 ( No. )  , pp.18 - 24 , 2017-03 , Elsevier
ISSN:0008-6223
内容記述
Liquid-phase exfoliation (LPE) of graphite is a promising method to produce few-layer graphene (FLG) inlarge quantities. Selection of the solvent or surfactant is the most important factor in determining theproductivity of LPE and the stability of the liquid FLG dispersion. To find efficient solvent systems forimproving the production of FLG, various approaches based on previous research, including addition of asurfactant and use of binary solvents, are investigated using a pressure homogenizer. Over the range ofsolvents and surfactants used in our study, we find that the greatest improvement in the production ofFLG results from the addition of an alkaline aqueous solution (pH 11) into organic solvents. Moreover, wefind that this approach works for the probe-sonication method of FLG production as well as for varioustypes of natural graphite. Solvent molecular size and electrostatic repulsion of graphene in liquid playimportant roles in improving the production of FLG because they mitigate the restacking of FLG duringexfoliation.

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