Abstract
In the course of the preparation of WO3 by sol-gel technique we have studied kinetics of its synthesis and the structural changes during gelation. In-situ Raman scattering spectra were obtained for a series of samples during the transition from aqueous solution to gel. The changes in the Raman features were monitored as a function of time during gelation. The removal of water molecules affects the symmetric W=O stretching mode. The Raman spectrum of a gelified sample shows peaks attributed to the O–W–O bending mode and the disappearance of the high-frequency mode attributed to polyanionic species. After two days the gelified sample became a precipitated material, which exhibited the Raman spectrum of a crystalline tungsten oxide hydrate.
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Picquart, M., Castro-Garcia, S., Livage, J. et al. Structural Studies During Gelation of WO3 Investigated by In-situ Raman Spectroscopy. Journal of Sol-Gel Science and Technology 18, 199–206 (2000). https://doi.org/10.1023/A:1008775318802
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DOI: https://doi.org/10.1023/A:1008775318802