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Sol-Gel Films With Tailored Microstructures*

Published online by Cambridge University Press:  25 February 2011

Deborah L. Logan ,
Carol S. Ashley  and
C. Jeffrey Brinker
Deborah L. Logan
Affiliation:
Ceramic Synthesis and Inorganic Chemistry Department 1846 Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–5800
Carol S. Ashley
Affiliation:
Ceramic Synthesis and Inorganic Chemistry Department 1846 Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–5800
C. Jeffrey Brinker
Affiliation:
Ceramic Synthesis and Inorganic Chemistry Department 1846 Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–5800
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Abstract

The refractive index and porosity of silicate films formed by dip-coating were tailored by varying the aging time of a two-step acid- and base-catalyzed sol to control the size and structure of the polymeric species prior to coating. 29Si NMR showed that there was a 2% increase in the total number of bridging oxygens with sol age, consistent with a cluster-cluster growth mechanism. However, several percent monomer remained regardless of aging. Dip-coated films were characterized by ellipsometry before and after heating to moderate temperatures at three rates. Sol aging prior to film deposition leads to greater film porosity, consistent with the concept of aggregation of fractal clusters, but only after a heat treatment to remove the organic species associated with incompletely hydrolyzed monomers from the pores.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 541
Copyright
Copyright © Materials Research Society 1992

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Footnotes

**

also UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131

*

This work was performed at Sandia National Laboratories, supported by the U.S. Department of Energy under Contract # DE-ACO4–76-DPOO789.

References

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