Abstract
Nano-size Au particle doped TiO₂ films were prepared with Ti(OC₃H? i )₄, polyvinylpyrrolidone(PVP), HAuCl₄ and C₃H?OH etc. by sol-gel method. TiO₂ gel films were obtained by the dip-coating method on the SiO₂ glass substrates, and then heat-treated at 700℃ for 10 min. The thickness of TiO₂ films were 0.7~1.8 ㎛. It was found that the thickness of films prepared from PVP containing solution was about 2~8 times higher values than that of thin films without PVP. The size of Au particles doped in the films were about 350~750 ㎚. Nano-size Au particle dispersed TiO₂ films showed high absorption peak at visible region 450 ㎚, which made them good candidates for non-linear optical materials and photo-catalytic materials. The contact angle of TiO₂ film for water was 12.5˚, and therefore it is clear that TiO₂ films have very high hydrophilic properties and the self-cleaning effects.
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