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Synthesis of Aqueous Dispersion of Graphenes via Reduction of Graphite Oxide in the Solution of Conductive Polymer 43 The conductivities of PEDOT films as a function of the graphene content were shown in figure 5. The thickness of the films range 0.1 μm to 0.3 μm. As the polymer-coated graphene content in PEDOT/PSS solution increase from 0 to 1.2wt%, the conductivity of graphene- doped PEDOT film increases. The PEDOT/PSS film with RGO-Nafion increased significantly from 0.25 S/cm for pure PEDOT film and reached 12 S/cm, and the film with RGO-PSS showed 3.2 S/cm when graphene was doped to 1.2x10-3wt% in PEOT solution. The conductivity of PEDOT doped Nafion-coated graphene were increased approximately 60-fold than the origin PEDOT film. This indicates that the doped graphene strongly influences the conductivity of PEDOT film. The film of PEDOT doped with RGO-Nafion had also higher conductivities than films doped with RGO-PSS. It is known that Nafion has ionic conductive property and PSS is the insulating material. As a result, it implies that the graphene coated with ionic conductive material contributes to enhancement of conductivity than that coated insulating material. 14 12 10 8 6 4 2 0 Fig. 5. Conductivity of PEDOT films with varying doping content 4. Conclusion In this study, we carried to the reduction of graphite oxide in the soluble Nafion, ionic conductive polymer. Reduced graphite was not dispersed in water but polymer-coated graphenes (RGO-PSS and RGO-Nafion) were dispersed readily in water, and readily forms stable dispersed state. There are considerable changes in FT-IR spectra of GO after treatment with hydrazine hydrate, implying successful reduction of graphite oxide in aqueous solution of Nafion. UV/Vis spectrum of RGO-Nafion is similar to the characteristic peak of RGO. It indicated that Nafion-coated graphene have the stable state in the water solution. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Concentration of graphite in solution (X10-3) Conductivity (S/cm)PDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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