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Proceedings Paper

H2 sensing performance of optical fibers coated with WO3 film
Author(s): J. Ou; M. H. Yaacob; M. Breedon; K. Kalantar-Zadeh; W. Wlodarski
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Paper Abstract

Optical gas sensing performance of optical fibers coated with sputtered Pd/WO3 films was investigated for low concentration H2 sensing. This optical fiber H2 sensor was prepared by RF sputtering of WO3 on the tip of the multimode fiber at 260°C and subsequently depositing a Pd catalytic layer. Highly uniform nanotextured film, with individual crystallites having diameters in the range of 35-50 nm was observed. The sensing mechanism was based on the reflectance change of Pd/WO3 layers towards H2 reliant on the gasochromic effect. Under the conditions of different sensing layer thicknesses and different operating temperatures, full Vis-NIR spectra investigations were carried out during the sensor testing. It was found that the optical fiber H2 sensor coated with Pd/WO3 film show a remarkable optical reflectance response towards H2 concentrations as low as 0.06%. The optimum sensing layer thickness was 200 nm and the optimum operating temperature was found to be 100°C.

Paper Details

Date Published: 8 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530N (8 September 2010); doi: 10.1117/12.866420
Show Author Affiliations
J. Ou, RMIT Univ. (Australia)
M. H. Yaacob, RMIT Univ. (Australia)
Univ. Putra Malaysia (Malaysia)
M. Breedon, RMIT Univ. (Australia)
K. Kalantar-Zadeh, RMIT Univ. (Australia)
W. Wlodarski, RMIT Univ. (Australia)

Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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