Abstract
The gasochromic mechanism in amorphous tungsten oxide films has been investigated using Raman scattering measurements and optical cycling tests. The Raman spectra of as-deposited films show two strong peaks at 770 and 950 cm −1 due to vibrations of the OW 6+O and W 6+O bonds, respectively. When the Pd/a-WO 3 films are gasochromically colored by exposure to diluted hydrogen gas, extra Raman peaks due to OW 5+O and W 5+O bonds appear at 330 and 450 cm −1, respectively. Optical cycling tests confirm that the Pd/a-WO 3 films can not be bleached without oxygen. The Raman spectra of a-WO 3 films bleached with isotopic heavy oxygen ( 18O) show that the gasochromic coloration in a-WO 3 films is directly related to the double injection of hydrogen ions and electrons.
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