Study On Green Preparation And Functional Application Of Graphene

In this thesis, to overcome the current problems exist in reduction of graphite oxide, an innovative route using glucose and fructose as reducing agents, which have mild reductive ability and environment-friendly property, to achieve effective reduction of graphite oxide. Graphene was successfully synthesized, and its functional application were deeply studied.Firstly, the synthesis process of graphite oxide was accomplished by Hummers method. Meanwhile, the production of graphite oxide was optimized. The products were characterized by Fourier transform Infrared spectroscopy (FTIR)、Laser Raman spectroscopy (Raman)、 X-ray Diffraction (XRD)、Scanning electron microscope (SEM) and SDY-Four-Point Probe. The results show that the synthetic GO has abundant oxygen-containing surface functional groups which shows a good dispersibility in water、N,N-dimethylformamide/water and N,N-dimethylformamide.Secondly, using glucose and fructose as reductant, graphene were prepared by GO in water without using any stabilizer. The structure and morphology of obtained product was characterized and analyzed by FTIR、XRD、Raman、Transmission electron microscope (TEM). In addition, the electrical conductivity of RGO was determinated by SDY-Four-Point Probe. The results show that the synthetic RGO has good electrical conductivity, and can be dispersed in water to form a stable suspension.Finally, using polyaniline (PANI)、phenolic resin (PR) and GO as raw materials and glucose as reductant, the RGO/PANI composite and RGO/PR composite have been fabricated through a simple method. The structure and morphology of obtained product were characterized by FTIR、XRD、Raman、UV-vis spectroscopy (UV-vis、and SEM. In addition, the electrical conductivity and thermal stability were determinated by SDY-Four-Point Probe and Thermogravimetric analysis (TGA). The results show that the electrical conductivity of RGO/PANI can be reached up to20.83S/cm by the adding of RGO. Meanwhile, and its loss of weight can be only9%at800℃, and it can readily dispersible in anhydrous ethanol. In addition, as the concentration of RGO increases, the solid content of RGO/PR also increase. And when the concentration rate of RGO is5%, the solid content of RGO/PR can be reach84%. When the concentration rate of RGO is3%, the carbon residue rate of RGO/PR can be reached up to61.2%, which is ten percentage point higher than PR’s own (45.9%). TGA further shows that RGO can improved the heat resistance of PR.