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Enhancing the Sensitivity of Chemical Sensors for Chlorinated Hydrocarbons in Water by the Use of Tapered Silver Halide Fibers and Tunable Diode Lasers

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Tapered silver halide fibers were used for the first time for high-sensitivity fiber evanescent wave spectroscopic (FEWS) measurements of chlorinated hydrocarbons (CHCs) in water at trace level. The sensor arrangement consisted of a tunable diode laser (TDL) source, a polymer-coated and tapered silver halide fiber, and a direct fiber/mercury cadmium telluride (MCT) detector coupling. A minimum detection limit of 50 μg L-1 was achieved by using a polyisobutylene-coated fiber with a 1:4 tapering ratio. The sensor response is in the minute range and shows reversible analyte enrichment.

Keywords: Chemical sensor; Chlorinated hydrocarbons; Fiber evanescent wave spectroscopy (FEWS); Tapered fibers; Tunable diode laser (TDL)

Document Type: Rapid Communication

DOI: http://dx.doi.org/10.1366/0003702953965119

Affiliations: 1: Institute for Analytical Chemistry, Technical University Vienna, Getreidemarkt 9/151, A-1060 Wien, Austria 2: Fraunhofer-Institut für Physikalische Messtechnik, Heidenhofstrasse 9, D-79110 Freiburg, Germany 3: Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel

Publication date: August 1, 1995

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