Study On The Mechanical Milling Process In Preparing Graphene By Oxidization-Reduction

Due to its excellent electrical, thermal, optical and mechanical peoperties, the graphene is considered to be the preference materials in next generation applied in organic optoelectronic material, microelectronic device material, muti-functional composites material, high efficiency hydrogen storage material and biomedical material. Therefore, it is important to simplify and control the preparation of massive graphene with low cost, and to furtherly optimizes the preparation process and conditons. Recent studies show that oxidation reducion method can be the most potential and development prospects graphene preparation method due to its simple, low cost and mass producion.In this paper, Graphite Oxide (GO) was prepared from purified natural flake graphite by using the modified Hummers method. The graphite oxide preparation process was futher simplified and four process parameters of the mechanical grinding were determined through the theory researching and process simulation. And the reduce graphene oxide (RGO) sample was prepared by mechanical milling processing. Influences of different milling time on the conductivity of the RGO sample were studied. The crystal structure, spectroscopy, chemical group composition of the samples were characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Energy Dispersive Spectrometer (EDS) and Ultraviolet-visible spectroscopy (UV-Vis). It is revealed that GO can be partly reduced by mechanical milling in a certain period of time since the oxygen functional groups decreased, but re-oxided with longer time. Results suggest that mechanical milling can reduce GO, which is relevant to the milling time, and it provide a new reference way for graphene preparation by oxidation reducion method.