Journal
SOLID STATE COMMUNICATIONS
Volume 149, Issue 47-48, Pages 2172-2176Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2009.09.018
Keywords
Graphene; Polyvinylpyrrolidone; Aqueous-phase exfoliation; Solution properties
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Funding
- Ministry of Education of the Czech Republic [IM6198959201, MSM6198959218]
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Treatment of crystalline graphite fine powder with an aqueous solution of the harmless and versatile substance polyvinylpyrrolidone under sonication results in water-soluble, polymer-protected graphene single layers without oxidation or destruction of the sp(2) character of the carbon core. The liquid-phase extraction of graphene monolayers was evidenced by TEM and AFM techniques, while their graphitic character was checked with Raman spectroscopy. Besides PVP, the water-soluble biopolymers albumin and sodic carboxymethylcellulose were also employed successfully in the aqueous-phase exfoliation of graphite, thereby supporting the generic character of the present method using a variety of suitable polymeric extractants. (C) 2009 Elsevier Ltd. All rights reserved.
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