H2 sensing performance of optical fibers coated with WO3 film

J. Ou; M. H. Yaacob; M. Breedon; K. Kalantar-Zadeh; W. Wlodarski

doi:10.1117/12.866420

8 September 2010 H₂ sensing performance of optical fibers coated with WO₃ film

J. Ou, M. H. Yaacob, M. Breedon, K. Kalantar-Zadeh, W. Wlodarski

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76530N (2010) https://doi.org/10.1117/12.866420
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

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.

Citation Download Citation

J. Ou, M. H. Yaacob, M. Breedon, K. Kalantar-Zadeh, and W. Wlodarski "H₂ sensing performance of optical fibers coated with WO₃ film", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530N (8 September 2010); https://doi.org/10.1117/12.866420

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