<sub> Of Tio 2 </ Sub> Thin Films And Their Optical Performance

TiO₂ is the most potential photocatalyst because of its stablechemistry properties, non-toxic and low cost. The appearance ofnanotechnology injects new vigor to photocatalyst field. Nano-TiO₂ haveobvious suface effect and quantum-size effect, as a result, it shows morepowerful oxidizing ability and reducing ability. In order to improve thephotocatalysis property and make good use of sunlight, many kinds ofnew type photocatalysis material have been developed continually.Besides TiO₂ modification photocatalyst, there are oxynitride, sulfide,titanates, columbate and so on. But TiO₂ is the most widely usedphotocatalyst in view of cost and stability.In this paper, TiO₂ thin films were prepared by DC magnetronsputtering at different oxygen partial pressure on the substrate of glass.The effect of different oxygen partial pressure and metal ion doping onsurface morphology, chemical composition, photoabsorption performanceand photocatalysis property was studied. TiO₂ thin films doped withvarious metal ions such as Cu, Ni, W, Mn and Ag, were prepared byco-sputtering. And its effect was studied also.The results show that, with the increase of oxygen partial pressure,the crystal size grows by degrees and the crystal quality is improved aswell. In absorption spectrum, the intensity of ultraviolet peak located at300 nm decreases, the absorption between 330 nm and 465 nm increasesgradually, and the absorption after 465 nm decrease.The effect of metal ion doping in TiO₂ thin films shows that, it ishelpful for the formation and growth of anatase phase, surfacemorphology, photoabsorption property and photocatalysis property isimproved as well.