Preparation of graphene via modified redox method and its electronic performance

Graphene is considered to be the core material for the next Industrial Revolution. In this work, graphene oxide (GO) was prepared using a modified Hummers method and, then, reduced to obtain graphene. NH-RGO and VC-RGO were obtained by reducing GO under the same conditions by using hydrazine hydrate and vitamin C, respectively. X-ray diffraction (XRD) spectra were employed to characterize its crystal structure. A scanning electron microscope (SEM) was used to observe the microstructure. The defect degree was determined using Raman spectra. The resistivity of the nitrogen-doped graphene was determined using a four-probe method. The results showed that the preparation time was shorter when vitamin C was used for the GO reduction; further, both the required temperature and the environmental pollution were low in this case. The characteristic peaks of XRD were more obvious than those of NH-RGO and had fewer defects. Raman spectroscopy showed that the G-peak of the prepared VC-RGO was narrower and the D-peak was weaker. Further, the Raman spectroscopy ID/IG was smaller and the structural performance was better. The sheet resistivity of VC-RGO of approximately 0.0163 omega m was slightly smaller than that of NH-RGO (0.0171 omega m). Therefore, the proposed method is an ideal method for replacing hydrazine hydrate to produce graphene.