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J Colloid Interface Sci. 2014 Mar 1;417:379-84. doi: 10.1016/j.jcis.2013.11.066. Epub 2013 Dec 4.

Liquid-phase exfoliation of expanded graphites into graphene nanoplatelets using amphiphilic organic molecules.

Author information

  • 1Energy Nano Materials Research Center, Korea Electronics Technology Institute (KETI), Seongnam 463-816, Republic of Korea. Electronic address: jisun.park@keti.re.kr.
  • 2Energy Nano Materials Research Center, Korea Electronics Technology Institute (KETI), Seongnam 463-816, Republic of Korea.
  • 3School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea. Electronic address: jhhan@chonnam.ac.kr.

Abstract

Graphenes with a two-dimensional lattice of carbons have been widely employed in diverse applications owing to their excellent electrical, thermal, mechanical, and gas-barrier properties. However, the frequently-used reduced graphene oxide (rGO), which is synthesized from natural graphites by strong oxidation and subsequent reduction via highly toxic components, exhibits imperfect characteristics because of remaining defect sites on its basal planes. Therefore, in this work, we present a convenient way to prepare graphene nanoplatelets (GNPs) with minimized defect sites on their basal planes employing liquid-phase exfoliation of edge-functionalized expanded graphites (EGs) with amphiphilic organic molecules. Exfoliated GNPs revealed approximately sub-7-nm-thickness and showed stable dispersibility in an organic media during 9 months. Furthermore, spray-coated GNP films presented homogeneously stacked morphologies without noticeable agglomerations.

Copyright © 2013 Elsevier Inc. All rights reserved.

KEYWORDS:

Dispersion; Expanded graphite; Functionalization; Graphene

PMID:
24407700
[PubMed]
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