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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/2529

Document Type: Article
Title: Nano-assembled thin film gas sensors. 1. Ammonia detection by a porphyrin-based multilayer film.
Authors: Korposh, Serhiy O.
Takahara, Naoki
Ramsden, Jeremy J.
Lee, Seung-Woo
Kunitake, Toyoki
Issue Date: Sep-2006
Citation: Serhiy O. Korposh, Naoki Takahara, Jeremy J. Ramsden, Seung-Woo Lee, Toyoki Kunitake; Nano-assembled thin film gas sensors. 1. Ammonia detection by a porphyrin-based multilayer film. Journal of Biological Physics and Chemistry, Vol 6 No 3, 2006, pp125-132
Abstract: A thin film of porphyrin deposited by the layer-by-layer method is employed as the active element for an optical sensor. The usefulness of this film technology and the resulting nanoscale matrix for the detection of volatile organic compounds (VOCs), aromatics and amine-containing substances has been studied. The sensing principle is based on monitoring the optical changes of the Q band at 700 nm, as induced by the analyte in the electrostatic interaction between tetrakis(4-sulfophenyl)porphine (TSPP) and poly(diallyldimethylammonium chloride) (PDDA) layers. Three thin film samples with different thicknesses were prepared to assess the effect of film thickness on the sensitivity. For ammonia, the sensor shows a linear sensitivity in the concentration range 0–100 ppm and the sensor response was within 30 seconds. Sensor response could be regenerated by rinsing in distilled water.
URI: http://hdl.handle.net/1826/2529
Appears in Collections:Staff publications - School of Applied Sciences

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