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Digitale Medien

Structural Studies During Gelation of WO3 Investigated by In-situ Raman Spectroscopy (2000)

Picquart, M. ; Castro-Garcia, S. ; Livage, J. ; [weitere]

Springer

Journal of sol gel science and technology 18 (2000), S. 199-206

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Details

ISSN: 1573-4846

Schlagwort(e): tungsten oxide ; sol-gel ; Raman spectroscopy

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1008775318802

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