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Sol-Gel-Derived Silica Films With Tailored Microstructures for Applications Requiring Organic Dyes

Published online by Cambridge University Press:  21 February 2011

Monica N. Logan ,
S. Prabakar  and
C. Jeffrey Brinker
Monica N. Logan
Affiliation:
Department 1846, M. S. 0607, Sandia National Laboratories, Albuquerque, NM 87185–5800
S. Prabakar
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, The University of New Mexico, Albuquerque, NM 87131
C. Jeffrey Brinker
Affiliation:
Department 1846, M. S. 0607, Sandia National Laboratories, Albuquerque, NM 87185–5800 UNM/NSF Center for Micro-Engineered Ceramics, The University of New Mexico, Albuquerque, NM 87131
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Abstract

A three-step sol-gel process was developed to prepare organic dye-doped thin films with tailored porosity for applications in chemical sensing and optoelectronics. Varying the acid- and base-catalyzed hydrolysis steps of sols prepared from tetraethoxysilane with identical final H2O/Si ratios, dilution factors and pH resulted in considerably different distributions of the silicate polymers in the sol (determined by 29Si NMR) and considerably different structures for the polymer clusters (determined by SAXS). During film formation these kinetic effects cause differences in the packing and collapse of the silicate network, leading to thin films with different refractive indices and volume fraction porosities. Under conditions where small pore-plugging species were avoided, the porosities of as-deposited films could be varied by aging the sol prior to film deposition. This strategy, which relies on the growth and aggregation of fractal polymeric clusters, is compatible with the low temperature and near neutral pH requirements of organic dyes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 115
Copyright
Copyright © Materials Research Society 1998

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References

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