Preparation of quaternary ammonium salt modified graphene oxide and its properties

Graphene oxide (GO) was prepared by the modified Hummers method,and modified by dodecyl dimethyl benzyl ammonium chloride (1227) to produce 1227 non-covalent modified graphene oxide (GO-1227). Raman spectrum, Diffuse reflection infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the chemical structure of GO-1227. X-ray diffraction was used to observe the exfoliated morphology of GO-1227. It is found that the layers of GO became more complete disordered and exfoliated after modified by 1227. Scanning electron microscope and Transmission electron microscope was used to characterize the micro structure of GO-1227. The results show that GO-1227 presented curling and folded layer structure. The disperse property of GO-1227 was measured and thermal stability of GO and GO-1227 was compared by thermogravimetry analysis. The solubility of GO-1227 was enhanced in the relatively weak polar solvent since the 1227 cations surround the layers of GO, and thermal stability of GO was improved due to the thermolysis of oxidation group was prevented by 1227 cations. Finally, nano-filler of the GO-1227 was mixed with gel polyelectrolyte based on polymethylmethacrylate and polystyrene block copolymer (PMMA-b-PS) to prepare the nanocomposited gelpolymer electrolytes (NGPE). The result of alternating-current impedance shows that the improvement of ionic conductivity is 8.6 times when the mixed ratio of GO-1227 is two over one thousand.