Structural characterization of silver doped silica prepared by two different wet chemical methods

Two sets of silver doped silica samples were prepared, one using the traditional sol-gel method and the other from colloidal silica. In samples prepared by the first method, the addition of Ag promotes crystallization of the SiO2 matrix when annealed at temperatures below those marked by the phase d...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2004-05, Vol.30 (2), p.89-94
Main Authors: ANGELITO-BANOS, J, AVILES-ARELLANO, L. M. R, LOUVIER-HERNANDEZ, J. F, MENDEZ-ALBORES, A, OCHOA-LANDIN, R, RODRIGUEZ-PROENZA, C. A, VAZQUEZ-DURAN, A. G, VELES-MEDINA, J. J, GONZALEZ-HERNANDEZ, J, BARREIRO-RODRIGUEZ, G, FLORES-FARIAS, R, FLORES-FARIAS, S, GUERRERO-GUERRERO, N. A, HERNANDEZ-LANDAVERDE, M. A, HURTADO-MACIAS, A, LOPEZ-BELTRAN, A. M, LOPEZ-GOMEZ, M
Format: Article
Language:English
Subjects:
Annealing
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Colloids
Cristobalite
Crystallization
Exact sciences and technology
General and physical chemistry
Organic chemistry
Phase diagrams
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Silica glass
Silicon dioxide
Silver
Sol-gel processes
Structural analysis
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Summary:Two sets of silver doped silica samples were prepared, one using the traditional sol-gel method and the other from colloidal silica. In samples prepared by the first method, the addition of Ag promotes crystallization of the SiO2 matrix when annealed at temperatures below those marked by the phase diagram. Before crystallization of the silica glass into the α-cristobalite phase occurs, the silver diffuses throughout the amorphous network to form silver colloidal particles at annealing temperatures that depend on the silver concentration. In samples obtained from the colloidal silica, larger Ag particles are formed at lower annealing temperatures. Further annealing at higher temperatures crystallizes the glass into the already mentioned phase. The reason of having larger Ag particles at lower temperatures in the latter set of samples is probably because they have a more open structure, produced by a wider distribution in the Si—O—Si bridging angle.
ISSN:0928-0707
1573-4846
DOI:10.1023/B:JSST.0000034696.92285.72