The structure of the materials was characterized by XRD and Raman spectroscopy. As shown in Figure , the original GOM shows a distinct (001) peak at 10.5° attributed to an 8.42 Å of interlayer space. The strong intensity and sharp shape of the peak indicate the highly ordered laminar structure of GOM. With the increase of addition amount of VC, the (001) peaks of VGMs demonstrate a trend of shifting to a higher position and reducing their intensities. The changes of VGM (001) peaks are plotted and linear fitted with high agreement (Figure ), indicating the high linear correlation between VC/GO mass ratio and the interlayer space in the VC in-situ reduction of GOM.