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Gasochromic effect of sol-gel WO3-SiO2 films with evaporated platinum catalyst

Authors
  • Xu, XQ
  • Shen, H
  • Xiong, XY
Publication Date
Aug 01, 2002
Source
GuangZhou Institute of Energy Conversion
Keywords
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Abstract

In the present work, the catalyst Pt was evaporated onto the sol-gel WO3, WO3-SiO2 films. These films were annealed at different temperatures and their structures were characterized by infrared, visible near infrared spectroscopy and X-ray diffraction. The coloring kinetics of the films was evaluated. The results revealed that the 0.75WO(3)-0.25SiO(2) composite films had faster coloring rates than the WO3 films. This improved behavior is attributed to the faster diffusion of atomic H resulting from the existence of more absorbed water, more pores, more phase boundaries, and more grain boundaries in the composite films. (C) 2002 Elsevier Science B.V. All rights reserved.

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