Tailoring functional properties of graphene oxide by defect-assisted surface and interface modifications

摘要

This work reports the defect-mediated surface and interface modifications of graphene oxide (GO) for tailoring its functional properties. For controlled generation of defects, 50 MeV O8+ swift heavy ions (SHI) irradiation at different fluence is employed. The modifications in the structural and functional properties are investigated by X-ray diffractometry (XRD) and Fourier transform infrared spectroscopic (FTIR) measurement. The study of its vibrational properties using Raman spectroscopy reveals the presence of defect-induced doping and strain in the GO nanosheets. There is a clear observation of systematic reduction of GO into reduced graphene oxide (rGO) with ion fluence. The absorption spectra obtained from UV-Visible (UV-Vis) spectrophotometer indicate tuning of its bandgap and refractive index due to modified functionalization in GO after SHI irradiation. The Monte Carlo-based simulation shows that the surface and interface modifications in the supported GO nanosheets are responsible for the observed change in its functional properties.