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Proceedings Paper

Sol-gel-derived optical pH sensors
Author(s): Pascale Lacan; P. LeGall; Jeannine Rigola; Christian Louis Lurin; D. Wettling; Christian Guizard; L. Cot
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Paper Abstract

The sol-gel process has been successfully used for preparing amorphous and transparent oxide materials doped with organic molecules. This paper reports on the possibility of using sol-gel materials as host matrices for organic dyes in order to perform optical pH sensors. Different materials have been investigated so as to study the influence of some characteristics (porosity, hydrophilicity, hydrophobicity...) on the dye optical behavior. Results will be presented for microporous silica and heteropolysiloxanes which are organic/inorganic composites materials obtained from ormosil precursors known to provide versatile systems. Preliminary experiments have been carried out with sol-gel thin films doped with fluorescein as pH indicator and coated onto flat glass substrates. Dynamic range and response time curves are reported for the different sensors. Problems of signal losses (leachability, dye degradation...), sensor lifetime and dye stability within the different matrices are also discussed.

Paper Details

Date Published: 7 December 1992
PDF: 12 pages
Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132038
Show Author Affiliations
Pascale Lacan, Lab. de Physicochimie des Materiaux (France)
P. LeGall, Kodak Research Ctr. (France)
Jeannine Rigola, Kodak Research Ctr. (France)
Christian Louis Lurin, Kodak Research Ctr. (France)
D. Wettling, Kodak Research Ctr. (France)
Christian Guizard, Lab. de Physicochimie des Materiaux (France)
L. Cot, Lab. de Physicochimie des Materiaux (France)

Published in SPIE Proceedings Vol. 1758:
Sol-Gel Optics II
John D. Mackenzie, Editor(s)

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