We investigated relatively new techniques for densification and crystallization of sol-gel silica, titania and silica-titania coatings at relatively low temperatures. Irradiation of ultraviolet photons above the band-gap energy was found to lead shrinkage of the sol-gel films through electronic excitations. Crystallization of sol-gel titania coatings was achieved by irradiation of ultraviolet laser (4.7 eV) beam. Exposure to water vapor was shown to be effective in rearrangement of sol-gel films causing densification of silica, crystallization of titania and phase separation of silica-titania around 100°C. These techniques are useful for preparation of hard silica coatings and crystalline titania films on low-heat-resistant substrates, such as polymer plates.
|ジャーナル||Thin Solid Films|
|出版ステータス||Published - 1999 8 30|
|イベント||Proceedings of the 1998 2nd International Confernce on Coatings on Glass (ICCG) - Saarbrucken, Germany|
継続期間: 1998 9 6 → 1998 9 10
ASJC Scopus subject areas