Methanol selective fibre-optic gas sensor with a nanoporous thin film of organic-inorganic hybrid multilayers

T. Wang; H. Okuda; S.-W. Lee

doi:10.1117/12.2183999

1 July 2015 Methanol selective fibre-optic gas sensor with a nanoporous thin film of organic-inorganic hybrid multilayers

T. Wang, H. Okuda, S.-W. Lee

Author Affiliations +

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96550Z (2015) https://doi.org/10.1117/12.2183999
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

The development of an evanescent wave optical fibre (EWOF) sensor modified with an organic-inorganic hybrid nanoporous thin film for alcohol vapor detection was demonstrated. The optical fibre with a core diameter of 200 μm was bent into U-shape probe optic fibre to enhance the penetation depth of light transferred into the evanescent filed. The bended region of the fibre was modified with a multilayered thin film of poly(allyamine hydrochloride) and silica nanoparticels, (PAH/SiO2)n, by a layer-by-layer (LbL) film deposition technique, followed by infusion of tetrakis(4- sulfophenyl)porphine, TPPS. The mesoporous film structure showed high sensitivity and selectivity to methanol by the aid of the TPPS infused inside the film. The optical sensor response was reversible and reproducible over many times of exposures to analytes, which was caused by the change in refractive index (RI) of the film.

Citation Download Citation

T. Wang, H. Okuda, and S.-W. Lee "Methanol selective fibre-optic gas sensor with a nanoporous thin film of organic-inorganic hybrid multilayers", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550Z (1 July 2015); https://doi.org/10.1117/12.2183999

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