Gasochromic mechanism in a-WO{sub 3} thin films based on Raman spectroscopic studies

Journal Article · Fri Sep 01 00:00:00 EDT 2000 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1287407· OSTI ID:20217435

Lee, Se-Hee ^[1]; Cheong, Hyeonsik M ^[1]; Liu, Ping ^[1]; Smith, Dave ^[1]; Tracy, C Edwin ^[1]; Mascanrenhas, Angelo ^[1]; Pitts, J Roland ^[1]; Deb, Satyen K ^[1]

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1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)

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-W{sup 6+}-O and W{sup 6+}=O bonds, respectively. When the Pd/a-WO{sub 3} films are gasochromically colored by exposure to diluted hydrogen gas, extra Raman peaks due to O-W{sup 5+}-O and W{sup 5+}=O bonds appear at 330 and 450 cm-1, respectively. The Raman spectra of a-WO{sub 3} films bleached with isotopic heavy oxygen ({sup 18}O) show that the gasochromic coloration in a-WO{sub 3} films is directly related to the double injection of hydrogen ions and electrons. (c) 2000 American Institute of Physics.

• OSTI ID: 20217435
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 88; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COLORATION
EXPERIMENTAL DATA
HYDROGEN
PALLADIUM
RAMAN SPECTRA
THIN FILMS
TUNGSTEN OXIDES
VIBRATIONAL STATES