▎ 摘　　要

We report on the gas fluorination of graphene oxide (GO) to control functionality. GO is fluorinated at room temperature using fluorine-nitrogen mixed gas in different ratios. X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FT-IR) are used to characterize the surface functional groups on the fluorinated GO. The oxygen functional groups in GO are getting decreased according to an increase of fluorine gas ratio. The proportion of semi-covalent C-F bond is increased with increasing the fluorine gas ratio. The structural properties of the fluorinated GO are investigated by X-ray diffraction (XRD) and Raman spectroscopy. The d-spacing and crystallite size of fluorinated GO are decreased to 0.771 and 2.125 nm, respectively. The thermal and morphological characteristics are also investigated. The results suggest that gas fluorination of GO enables to control the functionality and crystallite size of GO. (C) 2016 Published by Elsevier B.V.