Photocatalytic Properties of Mesoporous TiO2 Films Derived from Evaporation-Induced Self-Assembly Method
Hexagonal and cubic mesoporous TiO2 films were prepared by using triblock copolymer-templated sol-gel method via evaporation-induced self-assembly (EISA) process. The mesophase of TiO2 film was controlled by spin-speed during the spin-coating process. The hexagonal mesoporous structure was formed at a high spin-speed around 2000 rpm, whereas the cubic mesostructure was formed at a low spin-speed around 600 rpm. XRD and TEM results indicate that those mesostructures are highly organized with a pore diameter of 7 nm. The prepared cubic and hexagonal mesoporous films were tested as photocatalysts for the decomposition of 2-propanol in gas phase. Both films presented considerably higher photocatalytic activity than a nonporous TiO2 films prepared by a typical sol-gel process without addition of triblock copolymer. Notably, we found that the cubic mesoporous films showed a relatively higher photocatalytic activity than the hexagonal mesostructured film. We believe this is due to the orientation of pore channels open on the surface of mesoporous films.
Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee
J. H. Pan et al., "Photocatalytic Properties of Mesoporous TiO2 Films Derived from Evaporation-Induced Self-Assembly Method", Materials Science Forum, Vols. 510-511, pp. 58-61, 2006