An investigation on the assembling of WO3 particles on the matrix of silica solution

A facile way to prepare modified WO 3 structure by silica support through sol–gel method is reported. The WO 3 /SiO 2 complex film was synthesized from a two steps process and dip-coating method. The films were characterized with laser particle analyzer, IR, Raman. The studies of gelation time and p...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2012-11, Vol.64 (2), p.427-435
Main Authors: Gao, Guohua, Feng, Wei, Wu, Guangming, Shen, Jun, Zhang, Zenghai, Jin, Xiaobo, Zhang, Zhihua, Du, Ai
Format: Article
Language:English
Subjects:
Ceramics
Chemistry
Chemistry and Materials Science
Clusters
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Composites
Crosslinking
Dip coatings
Exact sciences and technology
Gas sensors
Gelation
General and physical chemistry
Glass
Immersion coating
Infrared spectroscopy
Inorganic Chemistry
Materials Science
Nanotechnology
Natural Materials
Optical and Electronic Materials
Particle size distribution
Raman spectra
Silica gel
Silicon dioxide
Sol-gel processes
Sols
Tungsten oxides
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Summary:A facile way to prepare modified WO 3 structure by silica support through sol–gel method is reported. The WO 3 /SiO 2 complex film was synthesized from a two steps process and dip-coating method. The films were characterized with laser particle analyzer, IR, Raman. The studies of gelation time and particle size distribution of WO 3 /SiO 2 sol indicate that the silica addition could largely reduce the polycondensation of WO 3 clusters. The reaction between WO 3 and SiO 2 were further systematically investigated using IR spectra, and an insight of this reaction was illuminated. Results reveal that Si–OH in SiO 2 sols tended to crosslink with WO 3 at the corner-sharing W–O sites, by which only edge-sharing WO x clusters could be detected. This modified the WO 3 structure was also approved by the Raman spectra, TEM and AFM images. Moreover, gas sensing properties of the WO 3 /SiO 2 films were tested. The assembled WO 3 films exhibited more stable gas sensing stability than pure WO 3 films.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-012-2873-9