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Proceedings Paper

U-shaped evanescent wave optical fibre sensor based on a porphyrin anchored nanoassembled thin film for high sensitivity ammonia detection
Author(s): S. Korposh; H. Okuda; T. Wang; S. W. James; S.-W. Lee
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Paper Abstract

A layer-by-layer (LbL) approach was used for the deposition of coatings with a nano-meter thickness onto a multimode optical fibre that was bent into a U-shape with the aim of demonstrating a fibre-optic ammonia sensor. The film was composed of alternate layers of tetrakis(4-sulfophenyl)porphine, TSPP, and poly(diallyldimethylammonium chloride), PDDA, deposited using the LbL electrostatic self-assembly process. Exposure of the assembled film to ammonia induced a change in its absorption spectrum, which could be observed in the transmission spectrum of the coated U-shaped optical fibre. The sensor showed a linear sensitivity (77.7 mV/ppm) to ammonia in the concentration range 1–100 ppm.

Paper Details

Date Published: 1 July 2015
PDF: 4 pages
Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965518 (1 July 2015); doi: 10.1117/12.2184438
Show Author Affiliations
S. Korposh, The Univ. of Nottingham (United Kingdom)
H. Okuda, Univ. of Kitakyushu (Japan)
T. Wang, Univ. of Kitakyushu (Japan)
S. W. James, Cranfield Univ. (United Kingdom)
S.-W. Lee, Cranfield Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 9655:
Fifth Asia-Pacific Optical Sensors Conference
Byoungho Lee; Sang-Bae Lee; Yunjiang Rao, Editor(s)

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