Effects of water/silane r-ratio and humidity on properties of sol-gel-entrapped indicators

Claudio Rottman; David Avnir

doi:10.1117/12.384334

2 May 2000 Effects of water/silane r-ratio and humidity on properties of sol-gel-entrapped indicators

Claudio Rottman, David Avnir

Proceedings Volume 3943, Sol-Gel Optics V; (2000) https://doi.org/10.1117/12.384334
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

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.

Citation Download Citation

Claudio Rottman and David Avnir "Effects of water/silane r-ratio and humidity on properties of sol-gel-entrapped indicators", Proc. SPIE 3943, Sol-Gel Optics V, (2 May 2000); https://doi.org/10.1117/12.384334

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