Infrared spectroscopy analysis of the local atomic structure in silica prepared by sol-gel

Infrared spectroscopy has been used to analyze the structural changes in samples prepared by the sol-gel method. Silica gels were prepared from alcoholic solutions of tetraethylorthosilicate (TEOS) with different H2O/TEOS molar ratios. The IR spectra of these gels, in the Si–O bond stretching region...

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Bibliographic Details
Published in:The Journal of chemical physics 1998-11, Vol.109 (17), p.7511-7514
Main Authors: Martı́nez, J. R., Ruiz, F., Vorobiev, Y. V., Pérez-Robles, F., González-Hernández, J.
Format: Article
Language:English
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Summary:Infrared spectroscopy has been used to analyze the structural changes in samples prepared by the sol-gel method. Silica gels were prepared from alcoholic solutions of tetraethylorthosilicate (TEOS) with different H2O/TEOS molar ratios. The IR spectra of these gels, in the Si–O bond stretching region, shows that their structure strongly depends on the H2O/TEOS ratio. The relative change in intensity of the Si–O stretching modes, in samples prepared using different H2O/TEOS ratios, are interpreted in terms of different degrees of structural disorder. According to our infrared absorption data, a decrease in the H2O/TEOS ratio from about 7, the SiO2 structure evolves from a three-dimensional network toward a chainlike structure.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.477374