基于固/气反应的氧化石墨烯水热还原研究

Hydrothermal Reduction of Graphene Oxide via Solid/Gas Reaction

关键词:  氧化石墨烯  水热还原  固/气反应

Key words:  graphene oxide  hydrothermal reduction|solid/gas reaction

摘要:

[目的]对氧化石墨烯的水热还原过程进行系统研究。[方法]采用改进的水热装置,以乙醇为还原剂,通过固/气反应成功实现了水热条件下氧化石墨烯的还原,制备得到石墨烯。通过透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、X射线近边吸收谱(XANES)和热重分析(TGA)对石墨烯材料的结构和性质进行了测试,探讨水热条件下乙醇蒸汽对氧化石墨烯的还原效果。[结果]研究结果表明,水热环境下的固/气反应还原能够有效地去除氧化石墨烯上的含氧基团,石墨烯的π网格结构得到很好的恢复。还原后的石墨烯材料比氧化石墨烯具有更为优异的热稳定性。[结论]该方法低成本、高效、环保,可用于石墨烯的大规模制备。

Abstract:

[Objective] A systemic investigation was performed to study the reduction process of graphene oxide by hydrothermal method.[Methods] The reduced graphene oxide (RGO) was facilely prepared via a solid/gas reaction of graphene oxide (GO) and ethanol vapor in a self-designed hydrothermal system.Ethanol was introduced into the hydrothermal system to improve the reduction.The structure and property of graphene materials were characterized by transmission electron microscope (TEM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) spectroscopy and thermogravimetric analysis (TGA).[Results] The oxygen functional groups were effectively removed by the solid/gas interfacial reduction in a hydrothermal process, and the π-conjugated framework of graphene was effectively recovered.The TGA results show that the thermal stability of RGO is much better than that of GO.[Conclusion] This method offers a low-cost, effective and eco-friendly route for large-scale production of grapheme.