Lipid Enhanced Exfoliation for Production of Graphene Nanosheets

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• 作者：Martin Pykal ; Kl谩ra 艩af谩艡ov谩 ; Karol铆na Machalov谩 艩i拧kov谩 ; Petr Jure膷ka ; Athanasios B. Bourlinos ; Radek Zbo艡il ; Michal Otyepka
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 6, 2013
• 年：2013
• 卷：117
• 期：22
• 页码：11800-11803
• 全文大小：250K
• 年卷期：v.117,no.22(June 6, 2013)
• ISSN：1932-7455

文摘

Liquid-phase exfoliation of graphite is a widely used method to obtain graphene nanosheets, and therefore the development of a simple and efficient exfoliation procedure remains challenging. Here, we present a one-step method of graphene exfoliation in lecithin/chloroform solution. The graphene nanosheets produced by the lecithin assisted exfoliation method were analyzed by microscopy techniques, including statistical analysis of atomic force microscopy (AFM) images and Raman spectroscopy, which both indicate the presence of few-layer graphene nanosheets, including substantial content of three-layer sheets. Molecular dynamics simulations on the time scale of 0.5+ 渭s suggested that stability of the obtained colloid may originate from formation of lecithin reverse hemimicelles and micelles, which prevents the aggregation of exfoliated graphene flakes by entropic repulsion of the lipid hydrophobic chains.