Surface, structural and optical properties dependence of Fe-doped TiO2 films deposited onto soda-lime-glass

In this study, pure and Fe doped TiO2 thin films have been prepared via sol-gel method using the tetraethylorthotitanate as source of Ti and Fe(III) nitrate as a source of Fe3+ doping. XRD patterns exhibit typical peaks of TiO2 anatase phase. SEM observations confirm the nanometer grain size (below 10 nm) without a defined shape. Optical measurements indicate a transparency in the range 80-100%, it increases with Fe doping level while the energy band gap slightly decreases; 3.36 - 3.28 eV. Wettability test shows a super-hydrophilicity of Fe3+ doped TiO2 thin films and the low contact angle is founded for 0.6%Fe. However, no enhancement in photocatalytic activity of Fe doped TiO2 thin films have been achieved. This may be attributed to sodium diffusion from the substrate. The as-prepared nanostructured Fe-doped TiO2 thin films can be used as potential candidate for selfcleaning due to the super-hydrophilicity character in the visible light.