Properties of spray deposited titanium dioxide thin films and their application in photoelectrocatalysis

摘要: Abstract Thin films of titanium dioxide were deposited onto optically transparent, electrically conducting substrates (fluorine doped tin oxide on glass). The two layers, SnO 2 and TiO , sequentially by spray pyrolysis. up to 800 nm thickness prepared varying the quantity sprayed solution (titanyl acetylacetonate in methanol), at a growth rate 0.15 nm/s. effect film structural, optical photoelectrochemical properties was studied. Scanning electron microscopy showed that polycrystalline anatase compact. grain size increased 1100 nm with increase thickness, whereas crystallite remained constant (40 nm) as shown X-ray diffraction. had transmittance more than 70% visible region. Junctions semiconducting aqueous electrolytes rectifying photoactive. Films 330 or 600 nm thick enough exhibit maximum response for light wavelength 313 365 nm, respectively. Under depletion conditions, an IPCE (incident photon current conversion efficiency) 0.8 330 nm 313 nm obtained. Oxalic acid degradation under UVA sunlight, applying electrical bias, demonstrated using these electrodes.