STRUCTURE AND INFRARED-SPECTRA OF SOL-GEL DERIVED TUNGSTEN-OXIDE THIN-FILMS

FT-IR/ATR spectroscopy and transmission/reflection ellipsometry were used to study the structure and the optical properties of hydrated tungsten oxide thin films prepared by a sol-gel synthesis. The formation of the film on an internal reflection element was followed spectroscopically. Bands were assigned to W-O bonds belonging to different condensed species. The close relationship between the spectral pattern, and the type and hydration state of the substrate is evidenced. The thickness and the optical properties of the hydrated tungsten oxide film were determined by transmission/reflection ellipsometry.