| Abstract
| - By monolayer coverage of highly acidic semiconductors, such as MoO3 and WO3 on thesurface of TiO2 nanoparticles (Degussa P25), the stability of colloidal suspensions in aqueoussolution can be greatly improved. The average diameter of agglomerated MoO3/TiO2 andWO3/TiO2 particles in aqueous suspension is only 85−110 nm, respectively, which is aboutone-fifth to one-fourth of that of pure TiO2 suspension. The optically transparent photocatalytic films have been prepared with deposition of these colloidal suspensions. The colloidalparticles in aqueous solution and the prepared transparent photocatalytic films werecharacterized with TEM, SEM, AFM, and other spectroscopic techniques. It has also beenfound that the photocatalytic activity of WO3/TiO2 film is 2.8−3 times that of pure TiO2 filmin decomposing gas-phase 2-propanol, while MoO3/TiO2 film is less effective.
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