Nanocrystalline titanium and indium oxides and TiO2−In2O3 composites have been prepared by sol−gel
technique using concentrated hydrous titanium dioxide and indium hydroxide sols. Structure, optical, and
photoelectrochemical properties of the composites with different molar ratios of TiO2 to In2O3 have been
studied. The binary oxide films and xerogels annealed at temperatures from 200 to 700 °C have a nanocrystalline
structure without the chemical interaction between the oxides. However, there is a strong mutual influence of
the components of the binary oxide systems, during their annealing which manifests itself in thermogravimetry
and differential scanning calorimetry measurements and in a marked effect on the oxide crystallite size. Highly
transparent TiO2−In2O3 films fabricated by spin-coating technique exhibit extreme dependencies of the various
optical and photoelectrochemical properties on the film composition. The band gap edge of the composite
films is blue-shifted, as compared with that of single-component films. Possible causes of these effects have
been discussed. The conductivity of TiO2−In2O3 films changes by 6 orders of magnitude in the range of
compositions near the calculated value for percolation threshold associated with the formation of 3D infinite
clusters of interconnected In2O3 nanoparticles.
Two magnetic core-shell type photocatalytic systems are presented: first, Zn0.35Ni0.65Fe2,O4-SiO2-TiO2, showed high activity in the photooxidation of oxalate, and the other, Fe3O4-Fe2O3-polyaniline: P2W18O62(6-), was tested in the reaction of SO2 photooxidation.
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