Synthesis And Application Of Graphene And Its Derivative Nanocomposites

Graphene, which consists of a one atom thick planar sheet comprising an sp2bonded carbon structure. Graphene has semi-metal properties, high carrier mobility, large specific surface area, good light transmission, high Young’s modulus and excellent thermal conductivity. In this paper, graphite oxide was synthesized, which not use nitrate as an oxidant. Then the graphene was obtained by chemical reduction and light reduction. Based on the graphene, three derivative materials were synthesized by inorganic and organic modified. One of the derivative materials,TiO2-graphene, was used as a counter electrode in dye-sensitized solar cells to take the place of platinum.The main tasks are as follows.(1) The phosphate-graphite oxide intercalation compounds were synthesized by two different methods. A variety of characterization methods proved that phosphate were in the graphite oxide layers, and also the graphite layers were sufficient exfoliation. These thermally enhanced compounds have very promising application in the flame retardant for polypropylene. (2) The thionyl chloride was used to processing the graphene oxide to obtain a higher reactive acyl group. Then the organic phosphorus flame retardants called DOPO was grafted to the acylation graphene. Raman detection find that the structure of carbon layers were changed after reaction. And the FTIR and XPS shows that graphene-DOPO were synthesized successfully. In this method, graphene-DOPO shows a good dispersion in an organic solvent.(3) TiO2-graphene was used as a counter electrode by spin coating method. By this method can also be introduced into flexible conductive substrate in the future.