Petrik I. Structure and the electronic phenomena in nanocrystalline films of TiO2 and TiO2/Fe2O3

The dissertation is devoted to research of influence of structure, morphology of a surface and synthesis conditions of nanosized coating of TiO2 and TiO2/Fe2O3 on their optical, non-linear-optical and photocatalytic properties. The influence of pore-creative agents on reological properties of the precursors is revealed. Dependence of structural, optical and photocatalytic characteristics of the films and powders of TiO2 and TiO2/Fe2O3 on the synthesis conditions and a degree of polymerization of an initial solution is investigated. Influence of the crystallite sizes and the films porosity on nonlinear-optical and photocatalytic properties of the films and powders is determined. It is shown, that at the numerical solution of a return task for ellipsometry at multiply angles of falling the mistake of the decision has oscillated dependence of accuracy of the ellipsometrical characteristics of nanosized anatase film on its physical parameters. It is shown, that as introduction in structure of TiO2 of iron ions, as well as its own defective structure and an environment of a surface of nanocrystals caused occurrence in the bandgap the additional energetic levels, which presence provides high values of a nonlinear susceptibility of environment of third order of TiO2 and TiO2/Fe2O3 films in comparison with a bulk material.