Size Fractionation of Graphene Oxide Sheets by pH-Assisted Selective Sedimentation

被引：298

作者：

Wang, Xiluan ^{[1
]}

Bai, Hua ^{[1
]}

Shi, Gaoquan ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem, Key Lab Bioorgan Phosphorus Chem & Chem Biol, Beijing 100084, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 16期

关键词：

GRAPHITE OXIDE; ELECTROCHEMICAL REDUCTION; HIGH-THROUGHPUT; TRANSPARENT; FILMS; EVOLUTION;

D O I：

10.1021/ja200218y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Graphene oxide (GO) sheets prepared by Hummers' method have been separated into two portions with large (II) or small (f2) lateral dimensions from their aqueous dispersion. This method is based on the selective precipitation of GO sheets with lateral dimensions mostly (>90%) larger than 40 mu m(2) at a pH value of 4.0 because of their larger hydrophobic planes and fewer hydrophilic oxygenated groups. The hydrazine reduced Langmuir-Blodgett (LB) films of f1 showed much higher conductivities than those of f2. Furthermore, the thin film of f1 prepared by filtration exhibited a smaller d-space and much higher tensile strength and modulus than those of 12 films. The one-step size fractionation method reported here is simple, cheap, efficient, and environmentally friendly, which can be used for the size fractionation of GO sheets in large scale.

引用

页码：6338 / 6342

页数：5

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