Cationic surfactant mediated exfoliation of graphite into graphene flakes

被引：270

作者：

Vadukumpully, Sajini ^{[1
]}

Paul, Jinu ^{[1
]}

Valiyaveettil, Suresh ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

来源：

CARBON | 2009年 / 47卷 / 14期

基金：

新加坡国家研究基金会;

关键词：

AQUEOUS DISPERSIONS; OXIDE; TRANSPORT; SHEETS; PHASE; FILMS;

D O I：

10.1016/j.carbon.2009.07.049

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A simple and effective method for the preparation of a few layered graphene nanoflakes directly from graphite has been successfully demonstrated. Mild ultrasonication of highly ordered pyrolytic graphite, in presence of a cationic surfactant cetyltrimethylammonium bromide and acetic acid yielded graphene nanoflakes, which formed a stable colloidal suspension in organic solvent such as N,N-dimethyl formamide. Scanning and transmission electron microscopic analyses showed that the dispersed phase consist of mainly few layered graphene nanoflakes. Average thickness of the flakes was found to be similar to 1.18 nm. Energy dispersive X-ray analysis indicated the absence of graphene oxide. Field emission measurements for the nanoflakes showed a turn on voltage of 7.5 V/mu m and emission current densities of 0.15 mA/cm(2). (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：3288 / 3294

页数：7

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