Preparation Of Nano Graphene Ethylenediamine Restore

In this paper,graphite oxide was exfoliated by ultrasonication in N,N-dimethylformamide(DMF) and water,respectively,followed by chemical reduction carried out by n-butylamine,ethylenediamine anhydrous(EDA) and hydrous hydrazine, respectively.Effect of the three reducing agents on the reduction of graphite oxide as well as the dispersion behavior of the reduced products were investigated.Exfoliation of graphite oxide was carried out in DMF and water,respectively.It was found that exfoliation was achieved by bath ultrasonication repeatedly for 5 h at temperature of 40℃～50℃.Thus stable dispersion of graphene oxide(GO) was formed.Observation of transmission electron microscopy(TEM) presented an effictive exfoliation of graphite oxide. Furthermore,chemical structure of GO was characterized by fourier transform infrared spectroscopy(FTIR),Raman spectroscopy,thermogravimetry analysis(TGA) and X-ray diffraction(XRD) analysis.Herein,n-butylamine,EDA and hydrous hydrazine were used to convert graphene oxide to graphene.It was found that the reduction using n-butylamine was the least effective while both EDA and hydrous hydrazine showed obvious effects on chemical reduction,which was demonstrated by FTIR,X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy. Results of TGA,XRD and conductivity measurement showed that hydrous hydrazine had a better effect on reduction of GO compared to EDA.The reduction ability of the three reducing agents from poor to good was in the order of n-butylamine＜EDA＜hydrous hydrazine. However,GO reduced by EDA(E-rGO system) seemed to be much more stable than that reduced by hydrazine(h-rGO system).It implied that chemical modification occurred simultaneously in the process of chemical reduction carried out by EDA.Chemical reduction mechanism of GO by EDA was proposed based on the experimental observations and the results of a variety of characterization.