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 journalArticle

54 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
Publication statusPublished - 1999 Aug 30

Fingerprint

Steam
Silicon Dioxide
Water vapor
Sol-gels
water vapor
titanium
Titanium
Silica
Irradiation
gels
vapors
silicon dioxide
coatings
Coatings
irradiation
Crystallization
crystallization
densification
Densification
Ultraviolet lasers

Keywords

  • Laser irradiation
  • Silicon oxide
  • Ttitanium oxide
  • Water

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Alternative modification methods for sol-gel coatings of silica, titania and silica-titania using ultraviolet irradiation and water vapor. / Imai, Hiroaki; Hirashima, Hiroshi; Awazu, Koichi.

In: Thin Solid Films, Vol. 351, No. 1-2, 30.08.1999, p. 91-94.

Research output: Contribution to journalArticle

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