1 July 2015 U-shaped evanescent wave optical fibre sensor based on a porphyrin anchored nanoassembled thin film for high sensitivity ammonia detection
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Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 965518 (2015) https://doi.org/10.1117/12.2184438
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of
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.
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S. Korposh, S. Korposh, H. Okuda, H. Okuda, T. Wang, T. Wang, S. W. James, S. W. James, S.-W. Lee, S.-W. Lee, } "U-shaped evanescent wave optical fibre sensor based on a porphyrin anchored nanoassembled thin film for high sensitivity ammonia detection", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965518 (1 July 2015); doi: 10.1117/12.2184438; https://doi.org/10.1117/12.2184438
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