Preparation of Bromo-functionalized Reduced Graphene Oxide by Radical Reaction†

doi:10.7503/cjcu20160813

Abstract

Abstract:

Bromo-functionalized reduced graphene oxide(rGOBr)which is a new derivative functionalization of graphene was prepared from graphene oxide(GO) by free radical reaction in three steps, NBS as the brominating agents and sodium thiosulfate as the reducing agent. The structure and surface morphology were investigated via X-ray diffraction(XRD), scanning electron microscopy(SEM), infrared spectrum(IR), Raman spectroscopy and X-ray photoelectron spectroscopy(XPS). The results showed that the bromine atoms were distributed uniformly on the surface of rGOBr sheets with covalent bond. This method asked for easily available raw materials, mild reaction conditions as well as simple operation, which provided enlightening insights into the chemical modification and prearation of bromo-functionalized graphene, as well as promotes more research enthusiasm and interest into bromo-functionalized graphene and other graphene materials.

Key words: Graphene, Free radical, Bromo-functionalization, Reduction

CLC Number:

O622

TrendMD:

XING Ruiguang, LI Yanan, ZHANG Bangwen, BULIN Chaoke. Preparation of Bromo-functionalized Reduced Graphene Oxide by Radical Reaction^†[J]. Chem. J. Chinese Universities, 2017, 38(5): 786.

Figures/Tables 5

Scheme 1 Process and possible mechanism of covalent functionalization of graphene by the radical reaction

Fig.1 FESEM images(A, B) and the corresponding element distributions for C(C) and Br(D) of rGOBr

Fig.2 XRD patterns(A) and TGA curves(B) of GO(a), GOCOOH(b) and rGOBr(c)

Fig.3 FTIR spectra(A) and Raman spectra(B) of GO(a), GOCOOH(b) and rGOBr(c)

Fig.4 Core-level XPS spectra of C1s(A) and Br2p(B) spectra of rGOBr

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