球磨辅助氧化还原法制备石墨烯

摘要

本文利用天然石墨作为原材料,采用改进的Hummers法制备氧化石墨(GO).首先将氧化石墨在低能球磨机中球磨10h,然后超声剥离得到氧化石墨烯.最后利用水合肼作为还原剂,通过磁力搅拌回流反应得到石墨烯.利用SEM,AFM,XRD,Raman,FFIR,TEM对所制备的石墨烯的形貌和结构进行表征.同时将经低能球磨制备的石墨烯与未经低能球磨制备的石墨烯进行比较,分析了在不同工艺条件下制备的石墨烯的效果.结果表明低能球磨有利于减薄氧化石墨,促进氧化石墨的剥离.并且有利于氧化石墨的还原,从而缩短回流还原反应时间,提高了制备石墨烯的效率.%Graphite oxide (GO) was prepared from natural graphite by a modified Hummers method. GO was firstly ball milled for 10 h and then exfoliated into graphene oxide by ultrasonication. Finally, graphene was prepared by magnetic mixing reflux method using hydrazine monohydrate as reductant. Graphene is characterized by SEM, AFM, XRD, Raman, FTIR, TEM measurements. The surface morphology and structure of graphene sheets which are prepared by low-energy ball milling assisted oxidization-reduction method and oxidization-reduction method without ball milling are compared and analyzed. The results show that ball milling contributes to the thinning and exfoliation of GO. Otherwise, low-energy ball milling can promote the reduction degree of GO, shorten the reflux reaction time and improve the efficiency of graphene preparation.