Alternative modification methods for sol-gel coatings of silica, titania and silica-titania using ultraviolet irradiation and water vapor

Hiroaki Imai, Hiroshi Hirashima, Koichi Awazu

Research output: Contribution to journalConference articlepeer-review

56 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)91-94
Number of pages4
JournalThin Solid Films
Volume351
Issue number1-2
DOIs
Publication statusPublished - 1999 Aug 30
EventProceedings of the 1998 2nd International Confernce on Coatings on Glass (ICCG) - Saarbrucken, Germany
Duration: 1998 Sep 61998 Sep 10

Keywords

  • Laser irradiation
  • Silicon oxide
  • Ttitanium oxide
  • Water

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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