Preparation and characterization of gasochromic Pt/WO3 hydrogen sensor by using the Taguchi design method

Chih Chieh Chan, Chia Wen Hsu, Chung Chieh Chang, Chao Sheng Hsu

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


In the present work, nanostructured WO3 films were prepared by the sol-gel spin coating method. The as-prepared films were annealed at different temperatures and their structures were characterized by field-emission scanning electron microscopy and X-ray diffraction. A layer of platinum (Pt) was then sputtered onto the surface of WO3 films. The coloring/bleaching kinetics was evaluated by alternate exposures to H2-N2 mixture and air. The cycling change of coloration was obtained from the UV-vis spectra. The Pt/WO3 thin films exhibited excellent gasochromic performance with good coloration change and fast response rate under ambient condition. Taguchi's experimental design approach was employed for conducting the experiments to study the influences of process parameters, such as annealing temperature, thicknesses of Pt catalyst and WO3 films, on the gasochromic performance. The stability of the gasochromic Pt/WO3 film was also evaluated by the switching cycle-life test.

Original languageEnglish
Pages (from-to)691-697
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - Mar 19 2010
Externally publishedYes


  • Gasochromic
  • Hydrogen sensor
  • Sol-gel
  • Taguchi method
  • Tungsten trioxide

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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