Fabrication And Characterization Of The Hydrophobic Self-cleaning Surface Based On The Graphene

Since graphene was founded in 2004, it has played important roles in varieties of areas. In this thesis, we mainly focus the research on the hydrophobic and self-cleaning performance of the graphene and its composites. Generally, there are two ways to make the self-cleaning surface, one is to construct the super-hydrophilic surfaces, and the other one is to build the super-hydrophobic surface. Surfaces with the contact angle larger than 150° and sliding angle lower than 10° show the super-hydrophobic behavior, and water droplets can easily slip off the surface, as a result, the surface is cleaned. In this paper we use the chemically reducted graphene oxide(RGO) to make the super-hydrophobic surfaces:(1)Fabrication of hydrophobic graphene surface based on the micro-nano structure. First we use the mask exposure to make the period microstructures, and the periods are 4um,8um,9um respectively. Then APS is used to carry out the amination process on the base and the graphene oxide is self-assembled and then after the annealing process the GO is combined on the base with chemical bonds. Aniline is used to reduce the GO after this process silicon halothane is used to modify the surface. We find that in this way the CA can reach 149.01°and the SA is very large so it can build a solid foundation for the subsequent graphene-TiO2 composite to make the self-cleaning surfaces.(2)Fabrication of super-hydrophobic surface based on the graphene-TiO2 composite and micro-nano structure. we use the electrostatic self-assembled method to make the graphene-TiO2 and carbon nanotubes-TiO2 compound. Through a series of comparison tests, we found that compared with the CNT-TiO2 composites, the RGO-TiO2 composites is better at self-cleaning. The addition of TiO2 can increase the CA and reduce the SA of the surface to obtain the real super-hydrophobic surface. At the same time, the graphene can extend the absorption spectrum of TiO2 to visible light in the composite and can photocatalytically decompose the organic matter that does not dissolve in water,and achieve the real sense of self-cleaning surface.