Title: Influence of Cu2O substrate on photoinduced hydrophilicity of TiO2 and ZnO nanocoatings

Abstract

The effect of a Cu2O substrate on the photoinduced change in the hydrophilicity of the surface of polycrystalline TiO2 and ZnO films was studied in this work. It was shown that the formation of layered Cu2O / TiO2 and Cu2O / ZnO heterostructures strongly changes the direction of the photoinduced change in the hydrophilic state of the surface. Under the action of ultraviolet radiation, the surfaces of TiO2 and ZnO films transform into a super hydrophilic state, while under the action of visible light, no change in the surface hydrophilicity is observed. In this work, it is shown that the formation of Cu2O / TiO2 and Cu2O / ZnO heterostructures leads to a photoinduced decrease in the hydrophilicity of the surface, both under the action of UV radiation and under the action of visible light. Photoinduced changes in surface hydrophilicity were compared with changes in surface free energy, polar and dispersion components. The change in the photoinduced hydrophilic behavior of TiO2 and ZnO surfaces during the formation of a heterostructure with Cu2O is explained by the transfer of electrons and an increase in the concentration of electrons on the TiO2 and ZnO surfaces.

Biography

Maria V. Maevskaya a PhD-student in Department of Photonics, Faculty of Physics, St. Petersburg State University;employee of the Laboratory “Photoactive Nanocomposite Materials”. Her research area is synthesis and characterization of semiconductor heterosystems, control of light by the hydrophilic state of the surface. Her research interests are IR spectroscopy of adsorbed molecules, photochemistry on the surface of semiconductors, photoactive nanocomposite materials.