Effect of Edge Modification on Water Dispersibility of Graphene Nanosheets
With a purpose of upgrading the water dispersibility of graphene,graphene nanosheets was pulverized and mixed into the aqueous solution of KMnO4 and sulphoric acid,following by a process of controlling oxidization for 1～4 h in an ice water bath.The oxidization process with relative mild degree introduced oxygen-containing groups onto the surface especially edge of the graphene nanosheets,and thus gave rise of the surface modification of the graphene.A UV-Vis spectrometer was employed to determine the water dispersibility and suspension stability of the edge-modified graphenes,while Raman Spectrum,X-ray Diffraction and Scanning Electron Microscope were used to characterize the microstructure of such graphenes.The experimental results showed that KMnO4 in a mass ratio of 30%regarding to that of graphene,the mass fraction of sulfuric acid in 70%,and the reaction time of 3.5 h in ice water bath were the most favorite to improve the water dispersibility of edge-modified graphenes,and the controllable oxidization process did not damage the layered structure of edge-modified graphenes and thus resulted in similar physical/chemical performances to that of original graphenes.
NETL
NSTL
万方数据
