通过密度梯度超速离心速率分离得到的单分散化学修饰石墨烯。

Monodisperse chemically modified graphene obtained by density gradient ultracentrifugal rate separation.

机构信息

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, China.

出版信息

ACS Nano. 2010 Jun 22;4(6):3381-9. doi: 10.1021/nn1000386.

DOI:10.1021/nn1000386

PMID:20443567

Abstract

A simple density gradient ultracentrifuge separation method has been developed for sorting chemically modified graphene (CMG) by sheet size and surface chemistry in just a few minutes. By optimizing the parameters, including the density gradient and centrifugation time, CMG sheets with specific size ranges and optical properties can be targeted selectively. UV-vis absorbance and photoluminescence spectra revealed the properties of separated CMG samples are highly dependent on their sheet size and degree of oxidation. A possible mechanism for the separation is discussed.

摘要

一种简单的密度梯度超速离心分离方法已经被开发出来，可以在几分钟内按片层尺寸和表面化学性质对化学修饰石墨烯（CMG）进行分类。通过优化参数，包括密度梯度和离心时间，可以有选择地靶向特定尺寸范围和光学性质的 CMG 片。紫外-可见吸收光谱和光致发光光谱表明，分离的 CMG 样品的性质高度依赖于其片层尺寸和氧化程度。讨论了一种可能的分离机制。