▎ 摘　　要

Reduced graphene oxide (RGO) nanosheets were produced by chemical reduction of exfoliated graphite oxide. Atomic force microscopy (AFM) images show that the obtained RGO nanosheets vary greatly in lateral-dimensional sizes, ranging from less than 100 100 nm to more than 2000 2000 nm. In order to separate these nanosheets, one simple and low-cost method mainly based on magnetic-stirring and centrifugation treatments was proposed. Preliminary statistical analysis of RGO nanosheets, based on AFM images, shows that the dot-like RGO nanosheets (with lateral dimensions less than 100 100 nm) and leaf-like RGO nanosheets (with lateral dimensions more than 500 500 nm) were effectively separated by this simple method. (C) 2009 Elsevier B.V. All rights reserved.