A Facile Doping of Graphene Oxide Nanosheets

摘要

One step and facile synthesis of SnO₂ doped graphene oxide (GO) nanoparticles were conducted by applying a new doping method based on modified Hummer method. The structural and thermal behavior were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and thermal gravitational analysis (TGA). GO sheets exhibited scrolling and crumpling morphology. SnO₂ was embedded in graphite during the initial stage of modified Hummer method and the surface morphology has aggregated lamellar structure with wrinkles. In Raman spectra, the characteristic D-band and G-band were observed in all the samples and the change in their ratio is attributed to the provided defects. The effect of incorporating tin nanoparticles in GO on the electrochemical behavior was investigated. The specific capacitance increases from 113 F/g to 355 F/g after SnO₂ doping. The better electrochemical behavior, the enhancement of conduction and capacitance is mainly related to the insertion of SnO₂ nano particles which act as a well decorated spacers for GO nanosheets and the mechanical strength of GO prevents the volumetric expansion of SnO₂ networks.