酸化チタン－酸化スズ混合ゾルから作製した超薄膜と物性評価

抄録

For specific evaluation of SnO₂ as a binder for forming TiO₂-containing thin films, we prepared TiO₂ - SnO₂ hybrid ultrathin films on glass plates by dip-coating into an aqueous SnO₂ sol containing TiO₂ particles and subsequent drying at 343 K. Immediately after preparation, the nanomer-sized crystals of the TiO₂ and SnO₂ were dispersed in the sol, which was a cloudy white suspension with no precipitate. Some particles gradually precipitated. The ultrathin hybrid films prepared from the sol dispersed the TiO₂ particles in the hydrous SnO₂ films. The hybrid film had adhesion that was too low to remain as a film on the glass plate during a rubbing test conducted with a cotton swab. Heat treatment at 773 K improved the low adhesion. The hybrid films exhibited high transmittance, super hydrophilicity, photocatalyst activity, and antistatic properties. The TiO₂ and SnO₂ particles, which were well dispersed in the sol, did not disturb the physical properties of other components in the hybrid film.