Developing easy and effective surface functionalization approaches has required to facilitate the processability of graphene while seeking novel application areas. Herein, an in situ single-step reductive covalent bromination of graphene has been reported for the first time. Highly brominated graphene flakes (>3% Br) were prepared by only subjecting the bromine-intercalated graphite flakes to a reduction reaction with reactive lithium naphthalide. The bromine-functionalized graphene was characterized by X-ray photoelectron spectroscopy and thermogravimetric analysis. Results revealed that Br2 molecules acted as both an intercalating agent for the graphite and a reactant for the surface functionalization of the graphene. After brominating, the remaining negative charges on the reduced graphene surface were further used for the dual surface functionalization of graphene with a long-chain alkyl group (~1% dodecyl group addition). The functionalized graphenes were also characterized by Fourier transform infrared and Raman spectroscopy.

为了寻求石墨烯的可加工性，同时寻求新颖的应用领域，需要开发简单有效的表面官能化方法。本文中，首次报道了石墨烯的原位单步还原共价溴化。通过仅使嵌入溴的石墨薄片与反应性萘二甲酸锂进行还原反应，即可制备出高度溴化的石墨烯薄片（> 3％Br）。溴官能化的石墨烯通过X射线光电子能谱和热重分析进行了表征。结果表明Br 2分子既充当石墨的嵌入剂，又充当石墨烯的表面官能化的反应物。溴化后，还原的石墨烯表面上残留的负电荷进一步用于带有长链烷基（〜1％十二烷基加成）的石墨烯的双表面官能化。还通过傅里叶变换红外和拉曼光谱表征了官能化的石墨烯。