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Proceedings Paper

Evanescent-wave oxygen sensing using sol-gel-derived porous coatings
Author(s): Brian D. MacCraith; Colette M. McDonagh; Gerard O'Keeffe; Johannes G. Vos; Brendan O'Kelly; John F. McGilp
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Paper Abstract

Porous glass coatings produced by the sol-gel process offer a number of advantages in optical sensor applications. In reagent-based chemical sensors they may be used to provide a robust support matrix in which analyte-sensitive dyes may be entrapped and into which the analyte may diffuse. Although distal tip and side coatings are both possible the latter, evanescent wave approach, is more advantageous. These advantages and the benefits of the sol-gel approach are illustrated by preliminary results from an oxygen sensor based on fluorescence quenching of sol-gel-entrapped ruthenium complexes. Declad multimode optical fibers coated with a thin microporous film containing either of two different oxygen-sensitive complexes were investigated. Under evanescent wave excitation the sensors exhibited repeatable quenching behavior when exposed to varying concentrations of oxygen. The oxygen sensitivity was improved by appropriate choice of ruthenium complex and film preparation. The sensors showed good signal-to-noise ratio, fast response time, and low photobleaching.

Paper Details

Date Published: 30 April 1993
PDF: 9 pages
Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); doi: 10.1117/12.143513
Show Author Affiliations
Brian D. MacCraith, Dublin City Univ. (Ireland)
Colette M. McDonagh, Dublin City Univ. (Ireland)
Gerard O'Keeffe, Dublin City Univ. (Ireland)
Johannes G. Vos, Dublin City Univ. (Ireland)
Brendan O'Kelly, Trinity College (Ireland)
John F. McGilp, Trinity College (Ireland)

Published in SPIE Proceedings Vol. 1796:
Chemical, Biochemical, and Environmental Fiber Sensors IV
Robert A. Lieberman, Editor(s)

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