Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films

Ken Ichi Katsumata, Akira Nakajima, Hidemi Yoshikawa, Tadashi Shiota, Naoya Yoshida, Toshiya Watanabe, Yoshikazu Kameshima, Kiyoshi Okada

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In the current work, we demonstrate the effect of the microstructure of polycrystalline TiO2 thin films prepared by the sol-gel process on the film's photoinduced hydrophilicity. The TiO2 thin films were prepared with different microstructures but almost the same crystal phase, band gap, film thickness and surface roughness. These films were prepared from the same starting materials, and the surface microstructure was changed by vacuum ultraviolet (VUV) irradiation before firing. The VUV-treated film possessed more heterogeneous microstructure (larger grains) than the non-VUV-treated film. The non-VUV-treated film exhibited a higher hydrophilicizing rate under UV irradiation than the VUV-treated film. Friction force microscopy (FFM) revealed that the relative area of the bright region, namely the hydrophilic region, increased in both films under UV irradiation. However, this contrast change is more homogeneous and remarkable in the non-VUV-treated film than in the VUV-treated film.

Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalSurface Science
Volume579
Issue number2-3
DOIs
Publication statusPublished - Apr 1 2005
Externally publishedYes

Fingerprint

Hydrophilicity
anatase
Titanium dioxide
Thin films
microstructure
Microstructure
thin films
Vacuum
vacuum
Irradiation
irradiation
titanium dioxide
sol-gel processes
Sol-gel process
Film thickness
Microscopic examination
surface roughness
Energy gap
film thickness
roughness

Keywords

  • Polycrystalline thin film
  • Surface structure
  • Titanium oxide
  • Wetting

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Katsumata, K. I., Nakajima, A., Yoshikawa, H., Shiota, T., Yoshida, N., Watanabe, T., ... Okada, K. (2005). Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films. Surface Science, 579(2-3), 123-130. https://doi.org/10.1016/j.susc.2005.01.035

Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films. / Katsumata, Ken Ichi; Nakajima, Akira; Yoshikawa, Hidemi; Shiota, Tadashi; Yoshida, Naoya; Watanabe, Toshiya; Kameshima, Yoshikazu; Okada, Kiyoshi.

In: Surface Science, Vol. 579, No. 2-3, 01.04.2005, p. 123-130.

Research output: Contribution to journalArticle

Katsumata, KI, Nakajima, A, Yoshikawa, H, Shiota, T, Yoshida, N, Watanabe, T, Kameshima, Y & Okada, K 2005, 'Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films', Surface Science, vol. 579, no. 2-3, pp. 123-130. https://doi.org/10.1016/j.susc.2005.01.035
Katsumata, Ken Ichi ; Nakajima, Akira ; Yoshikawa, Hidemi ; Shiota, Tadashi ; Yoshida, Naoya ; Watanabe, Toshiya ; Kameshima, Yoshikazu ; Okada, Kiyoshi. / Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films. In: Surface Science. 2005 ; Vol. 579, No. 2-3. pp. 123-130.
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