Optical Thin-Film Sensors for the Determination of Aqueous Halide Ions |
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Authors: | Chris D. Geddes Peter Douglas Christopher P. Moore Trevor J. Wear Peter L. Egerton |
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Affiliation: | (1) Department of Chemistry, The University of Wales Swansea, Singleton Park, Swansea, South Wales, SA2 8PP, UK;(2) Department of Physics and Applied Physics, The University of Strathclyde, Glasgow, G4 ONG, UK;(3) Kodak Ltd., Headstone Drive, Harrow, Middlesex, HA1 4TY, UK |
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Abstract: | Fourteen thin-film optical sensors in which halide-sensitive fluorophores are immobilized in a thin copolymer film (50 m, dry) have been developed and characterized. The sensor films use rhodamine, 6-methoxyquinoline, and harmane dyes which have been functionalized and bound to a hydrophilic copolymer. The sensor films are reversibly capable of determining aqueous bromide and iodide with 4 and 2% accuracy, respectively, at concentrations of around 10–3 mol dm–3, and are more sensitive than previous plastic sensor fabrications. The 90% response time to molar iodide is 30–60 s. A combination of sensor films allows the simultaneous determination of both I– and Br– in a mixed-halide solution. The interference of several ions, including pseudo-halides, on the sensor films has been studied. |
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Keywords: | Thin film sensor halide fluorescence quenching |
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