Solvothermal synthesis of homogeneous graphene dispersion with high concentration

Solvothermal synthesis of homogeneous graphene dispersion with high concentration
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溶剂热合成高浓度均相石墨烯分散液

DOI:
10.1016/j.carbon.2011.05.030
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发表时间:
2011-10
期刊:
影响因子:
10.9
通讯作者:
Han Bao-Hang
Han Bao-Hang
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhou Ding;Cheng Qian-Yi;Han Bao-Hang

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我们开发了一种简单的无表面活性剂方法,通过在N,N-二甲基甲酰胺中溶剂热还原氧化石墨烯来分散石墨烯,所制备的石墨烯分散体的浓度可达0.3mgmL−1。所制备的石墨烯可以在N-甲基吡咯烷酮、N,N-二甲基乙酰胺、乙腈等六种以上溶剂中良好地再分散。在溶剂热还原过程中,不需要额外的还原剂和/或稳定剂,并且通过高压釜中相对较高的温度和自生压力促进脱氧。原子力显微镜分析显示所制备的分散体中的大多数石墨烯片是单层的。 X射线光电子能谱、热重分析和红外光谱证实了含氧基团的有效去除。
We developed a simple surfactant-free approach to graphene dispersion through a solvothermal reduction of graphene oxides in N,N-dimethylformamide, and the concentration of the as-prepared graphene dispersion can reach up to 0.3mgmL−1. The as-prepared graphene could be re-dispersed well in more than six kinds of solvents, such as N-methylpyrrolidone, N,N-dimethylacetamide, and acetonitrile. In the solvothermal reduction process, no extra reducing agent and/or stabilizer is needed, and the deoxygenation is promoted by the relatively high temperature and autogenous pressure in the autoclave. Atomic force microscopy analysis shows most of the graphene sheets in the as-prepared dispersion are single-layered. X-ray photoelectron spectroscopy, thermal gravimetric analysis, and infrared spectroscopy confirm the efficient removal of the oxygen-containing groups.
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