pp. 179-189
S&M758 Research Paper of Special Issue https://doi.org/10.18494/SAM.2009.591 Published: July 21, 2009 Nanoassembled Thin-Film Gas Sensor II. An Intrinsic Highly Sensitive Fibre Optic Sensor for Ammonia Detection [PDF] Sergiy Korposh, Suguru Kodaira, William Batty, Stephen W. James and Seung-Woo Lee (Received January 27, 2009; Accepted April 23, 2009) Keywords: fibre optic sensor, evanescent wave, layer-by-layer adsorption, porphyrin, ammonia
A layer-by-layer approach was used for the deposition of coatings with a nanometre thickness onto a multimode optical fibre, from which the cladding had been removed, with the aim of realizing a fibre optic ammonia sensor. The film was self-assembled with alternate layers of tetrakis-(4-sulfophenyl) porphine (TSPP) and poly(diallyldimethylammonium chloride) (PDDA). The exposure of the assembled film to ammonia induced optical changes in the transmission spectrum of the coated optical fibre, reflecting the characteristic absorption bands (Soret and Q bands) of the assembled TSPP compound. The fibre optic sensor showed a linear sensitivity to ammonia in the concentration range of 0.1–20 ppm and the response and recovery times were less than 3 min with a limit of detection of 0.9 ppm at 706 nm.
Corresponding author: Seung-Woo LeeCite this article Sergiy Korposh, Suguru Kodaira, William Batty, Stephen W. James and Seung-Woo Lee, Nanoassembled Thin-Film Gas Sensor II. An Intrinsic Highly Sensitive Fibre Optic Sensor for Ammonia Detection, Sens. Mater., Vol. 21, No. 4, 2009, p. 179-189. |