Hydrogen incorporation and gasochromic coloration of tungsten oxide films

S. Nagata, A. Inouye, S. Yamamoto, B. Tsuchiya, K. Takano, K. Toh, Tatsuo Shikama

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The retention and release of hydrogen were studied in connection with the gasochromic coloration and bleaching of tungsten oxide (WO3) thin films prepared by RF magnetron sputtering at various substrate temperatures. The concentration depth profiles of hydrogen in the WO3 film were measured by the Elastic Recoil Detection Analysis technique. The hydrogen was effectively incorporated and was uniformly distributed in the WO3 films deposited at the higher substrate temperatures above 400 K, where crystalline structure was formed with a preferred orientation. Excellent gasochromic characteristics were found for the highly oriented crystalline WO3 film covered with a Pd layer. In situ measurements of hydrogen retention and optical transmission of the WO3 demonstrated that hydrogen concentration in the WO3 film increased with decreasing the optical transmission during the exposure of hydrogen gas.

Original languageEnglish
Pages (from-to)558-561
Number of pages4
JournalJournal of Alloys and Compounds
Publication statusPublished - 2007 Oct 31


  • Optical properties
  • Oxide materials
  • RBS
  • Thin films

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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