期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 151, 期 2, 页码 327-332出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.07.028
关键词
Amphiphilic co-network (APCN); Silicone hydrogel; Optical gas sensor; Chlorine; o-Tolidine
资金
- Deutsche Forschungsgemeinschaft (DFG)
A sensor for chlorine gas detection, consisting of an amphiphilic polymer co-network with an immobilised oxidation indicator, o-tolidine, is described. Data describing gas sensing properties and long-term stability will be presented. This study focuses on APCN thin films as a matrix for indicator immobilisation. Thin films of poly(2-hydroxyethyl acrylate)-1-polydimethylsiloxane PHEA-I-PDMS were prepared as immobilisation matrices for o-tolidine. We present a simple, non-expensive, but highly sensitive optical sensor for chlorine gas detection. The thin film response is reproducible and irreversible. With our kinetic-optical method rapid response times were achieved. The determination of chlorine is performed on the basis of the oxidation of o-tolidine as the chromogenic reagent to a coloured product which can be monitored at 650 nm. The results reveal a fast response to chlorine gas down to concentrations of 0.01 ppm. (C) 2010 Elsevier B.V. All rights reserved.
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