title: Photocatalytic activity and related surface properties of transparent ZnO films prepared by a low-temperature aqueous route.
abstract: Transparent ZnO were prepared using solutions with various trisodium citrate concentrations by a spin-spray method at 90°C. The morphological and structural characteristics, as well as photocatalytic activity of the resulting ZnO films were examined with respect to the added trisodium citrate concentration. Photocatalytic activities of the ZnO films were evaluated from photodecomposition of methylene blue (MB) in aqueous solution. With increasing citrate concentrations, the ZnO films came to have higher transmittances in visible region but lower MB decomposition rate. Both high transmittance and high photocatalytic activity were achieved in the ZnO film prepared in the citrate concentration of 0.5 mm. The possible mechanism for the difference in photocatalytic activity by the samples prepared with the various concentrations of citrate was discussed from the viewpoint of film texture, crystal orientation and surface chemical state.
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, Midori-ku, Yokohama, Japan.
authors.forename: Hajime
authors.initials: H
authors.lastname: Wagata
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Katsumata
authors.forename: Naoki
authors.initials: N
authors.lastname: Ohashi
authors.forename: Munetoshi
authors.initials: M
authors.lastname: Sakai
authors.forename: Akira
authors.initials: A
authors.lastname: Nakajima
authors.forename: Akira
authors.initials: A
authors.lastname: Fujishima
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Okada
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Matsushita