Synthesis and characterization of polymer grafted graphene oxide sheets using a Ce (IV)/HNO3 redox system in an aqueous solution
Lijun Ma(马丽君), Xiaoming Yang(杨晓明), LingfengGao(高凌锋), Min Lu(卢敏), ChengxinGuo(郭承鑫), Yaowen Li(李耀文), YingfengTu(屠迎锋)*, and Xiulin Zhu(朱秀林)
Carbon 2013，53，269-276.
We provide here a simple way to synthesize polymer grafted graphene oxide (GO) sheets with intercalated or exfoliated structure by using a redox system with cerium (IV) ammonium nitrate/nitric acid and GO sheets’ hydroxyl groups as the redox couple. Polystyrene, poly (methyl methacrylate) and polyacrylonitrile grafted GO sheets were synthesized in an aqueous solution by this redox-initiated free-radical polymerization strategy, and characterized with Fourier transform infrared spectroscopy, X-ray diffraction, and atomic force microscopy. We investigated the effects of temperature and redox initiator’s concentration on the grafting efficiency. It was found that when a small amount of polymer was grafted onto GO sheets, an intercalated layer structure was formed; while an exfoliated structure was formed with a large amount of polymer grafted.
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