▎ 摘　　要

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.