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Proceedings Paper

Effects of water/silane r-ratio and humidity on properties of sol-gel-entrapped indicators
Author(s): Claudio Rottman; David Avnir
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Paper Abstract

When entrapping indicators in sol-gel materials for optical sensing purposes, one should be careful to take into account that changes in the cage properties, caused by variations in the synthetic procedures, might affect the performance of the dopant. We show - for SiO2 sol-gel entrapped pH and polarity indicators - that such variations are brought about by changing the water-silane r-ratio preparation conditions and by changing the environmental humidity to which the material is exposed. The observations are interpreted in terms of changes in the acidity and polarity of the cage surface.

Paper Details

Date Published: 2 May 2000
PDF: 9 pages
Proc. SPIE 3943, Sol-Gel Optics V, (2 May 2000); doi: 10.1117/12.384334
Show Author Affiliations
Claudio Rottman, Hebrew Univ. of Jerusalem (Israel)
David Avnir, Hebrew Univ. of Jerusalem (Israel)


Published in SPIE Proceedings Vol. 3943:
Sol-Gel Optics V
Bruce S. Dunn; Edward J. A. Pope; Helmut K. Schmidt; Masayuki Yamane, Editor(s)

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