Hostname: page-component-78c5997874-4rdpn Total loading time: 0 Render date: 2024-11-09T12:56:32.642Z Has data issue: false hasContentIssue false

Sol-Gel Films With Tailored Microstructures*

Published online by Cambridge University Press:  25 February 2011

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
Get access

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
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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

REFERENCES

1. Zusman, R., Rottman, C., Ottolenghi, M. and Avnir, D., J. Non-cryst. Solids 122, 107109 (1990).Google Scholar
2. Chernyak, V., Reisfeld, R., Gvishi, R. and Venezky, D., Sensors and Materials 2 (2), 117126 (1990).Google Scholar
3. Dunn, B., Knobbe, E., McKiernan, J. M., Pouxviel, O. C. and Zink, J. I. in Better Ceramics Through Chemistry III, edited by Brinker, C. J., Clark, D. E. and Ulrich, D. R. (Mater. Res. Soc. Proc. 121, Pittsburg, PA, 1988) pp. 331342.Google Scholar
4. Reisfeld, R. in Sol-Gel Optics, SPIE Proceedings 1328, 2939 (1990).CrossRefGoogle Scholar
5. Reisfeld, R. in Sol-Gel Science and Technology, edited by Aegerter, M. A., Jafelicci, M. Jr, Souza, D. F. and Zanotto, E. D. (World Scientific, Singapore, 1989) pp. 323345.Google Scholar
6. Levy, D., Einhorn, S. and Avnir, D., J. Non-cryst. Solids 113, 137145 (1989).Google Scholar
7. Brinker, C. J., Hurd, A. J., Frye, G. C., Schunk, P. R. and Ashley, C. S., J. Ceram. Soc. of Japan 99 (10), 862877 (1991).Google Scholar
8. Brinker, C. J. and Scherer, G. W., Sol-Gel Science (Academic Press, San Diego, CA, 1990) pp. 799811.Google Scholar
9. Brinker, C. J., Keefer, K. D., Schaefer, D. W. and Ashley, C. S., J. Non-cryst. Solids 48 4764 (1982).Google Scholar
10. Brinker, C. J., Keefer, K. D., Schaefer, D. W., Assink, R. A., Kay, B. D. and Ashley, C. S., J. Non-cryst. Solids, 63, 4559 (1984).Google Scholar
11. Hua, D. W. and Logan, D.L., unpublished results.Google Scholar