Irradiation on photo catalytic TiO2 thin films for biological applications

Photocatalytic hydrogen production using suspended photo catalysts were studied. TiO2 anatase in a powder form was used as photo catalyst. Our investigation aims to wards the creation of improved photo catalysts to be used in the production of hydrogen from water or aqueous solutions of organic compounds. TiO2 anatase in a powder form was used originally as photo catalyst. It was found that the photocatalytic activity depends significantly on catalyst type and its modification such as loading with various transition metal oxides. In photocatalysis, light irradiation of TiO2 powder with photon energy larger than the band-gap energy produces electrons (e-) and holes (h+) in the conduction band and the valence band, respectively. These electrons and holes are thought to have the respective abilities to reduce and oxidize chemical species adsorbed on the surface of TiO2 particles. In most photocatalytic reactions, oxidation processes are utilized for a variety of purposes, and the reduction of molecular oxygen is often used as a counter reaction. Hence, in the field of photocatalysis, most of the research interest has been focused on oxidation processes. Pure and doped thin films of TiO2 will be prepared. Nano structure in thin films of pure and doped TiO2 will be introduced by SHI irradiation. Desired modification can be achieved by tailoring it with SHI irradiation of Ag or Li with energies around 100-200MeV. We will study the structure, surface morphology and dielectric properties and resistivity and thermo dynamical properties of these films. Various schemes to accomplish visible light photo catalysis will be described along with the general synthesis issues, characterizations, and applications. One of the most exciting recent discoveries is the effect of irradiation on TiO2 were improve the optical reactivity of TiO2 in the visible region.