Solution Phase Production of Graphene with Controlled Thickness via Density Differentiation

被引：637

作者：

Green, Alexander A.

Hersam, Mark C. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 12期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

CARBON NANOTUBES; ELECTRONIC-STRUCTURE; TRANSPARENT; EXFOLIATION; GRAPHITE; FILMS;

D O I：

10.1021/nl902200b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Graphene flakes with controlled thicknesses are isolated in solution using density gradient ultracentrifugation. These stable graphene dispersions are produced using the bile salt sodium cholate, which promotes graphite exfoliation and results in graphene-surfactant complexes having buoyant densities that vary with graphene thickness. The sorted graphene flakes are characterized using atomic force microscopy and Raman spectroscopy. Graphene dispersions produced using density differentiation offer superior performance in transparent conductors than those produced using conventional sedimentation-based centrifugation techniques.

引用

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页码：4031 / 4036

页数：6

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