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Proceedings Paper

Highly sensitive and linear optical fiber carbon dioxide sensor based on sol-gel matrix doped with silica particles and HPTS
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Paper Abstract

This paper presents a high-performance fiber-optic carbon dioxide (CO2) sensor based on sol-gel matrix composed of n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) doped with pH-sensitive fluorescent dye and silica particles. The sensor film consists of 1-hydroxy-3,6,8-pyrenetrisulfonic acid trisodium salt (HPTS, PTS-), silica particles, tetraoctylammonium cation (TOA+), and a tetraoctylammonium hydroxide (TOAOH) phase transfer agent (i.e. the base) immobilized within the sol-gel matrix. The sensor has a sensitivity of approximately 26 and exhibits a uniquely linear response for CO2 concentrations in the range 0~100 %. The response time of the sensor is 9.8 s when switching from a pure N2 atmosphere to a pure CO2 atmosphere and 195.4 s when switching from CO2 to N2.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031D (5 October 2009); doi: 10.1117/12.833521
Show Author Affiliations
Yu-Lung Lo, National Cheng Kung Univ. (Taiwan)
Chen-Shane Chu, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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