ISSN:
1573-4994
Keywords:
Thin film
;
sensor
;
halide
;
fluorescence quenching
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Fourteen thin-film optical sensors in which halide-sensitive fluorophores are immobilized in a thin copolymer film (≍50 μm, 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022502131091
