Optical Gas Sensor Fabrication Based on Porphyrin-Anchored Electrostatic Self-Assembly onto Tapered Optical Fibers

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2012-07-31T00:00:00Z

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Taylor & Francis

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Article

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0003-2719

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Renata Jarzebinska, Sergiy Korposh, Stephen James, William Batty, Ralph Tatam and Seung-Woo Lee, Optical Gas Sensor Fabrication Based on Porphyrin-Anchored Electrostatic Self-Assembly onto Tapered Optical Fibers, Analytical Letters, Volume 45, Issue 10, 2012, Pages 1297-1309.

Abstract

Tapered optical fibers with nano-assembled coatings of thicknesses of order tens of nanometres were used for the detection of ammonia gas. The film coating was composed of alternate layers of tetrakis-(4-sulfophenyl) porphine (TSPP) and poly(allylamine hydrochloride) (PAH), which were deposited using the electrostatic self-assembly process (ESA). Exposure of a PAH/TSPP nano-assembled non-adiabatic tapered optical fiber with a waist diameter of 10µm to ammonia induced significant optical changes in the transmission spectrum of the optical fiber. The fiber optic sensor showed a linear sensitivity to the concentration of ammonia in the range of 10-100ppm, with response and recovery times less than 100 and 240sec, respectively. The 3σ limit of detection (LOD) was estimated to be ca. 2ppm.

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This is a postprint of an article whose final and definitive form has been published in the Analytical Letters 2012 copyright Taylor & Francis; Analytical Letters is available online at: http://www.tandfonline.com/doi/abs/10.1080/00032719.2012.673097#.UuuBSLS0CW9

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