Gasochromic mechanism in a-WO3 thin films based on Raman spectroscopic studies
- 1 September 2000
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 88 (5) , 3076-3078
- https://doi.org/10.1063/1.1287407
Abstract
The gasochromic mechanism in amorphous tungsten oxide films has been investigated using Raman scattering measurements. The Raman spectra of as-deposited films show two strong peaks at 770 and 950 cm−1 due to vibrations of the O–W6+–O and W6+=O bonds, respectively. When the Pd/a-WO3 films are gasochromically colored by exposure to diluted hydrogen gas, extra Raman peaks due to O–W5+–O and W5+=O bonds appear at 330 and 450 cm−1, respectively. The Raman spectra of a-WO3 films bleached with isotopic heavy oxygen (18O) show that the gasochromic coloration in a-WO3 films is directly related to the double injection of hydrogen ions and electrons.This publication has 9 references indexed in Scilit:
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