Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 186, Issue -, Pages 367-373Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.06.007
Keywords
Amphiphilic co-network; Silicone hydrogel; Optical gas sensor; Nitrogen dioxide; N,N '-diphenyl-1,4-phenylenediamine (DPPD)
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A disposable and irreversible sensor for nitrogen dioxide detection, based on the reaction of NO2 with N,N'-diphenyl-1,4-phenylenediamine (DPPD) is described. This work focuses on the application of silicone-containing amphiphilic co-networks (APCNs) as immobilisation matrices for UV/VIS transmission spectroscopy for gas sensors. The developed flow-through gas sensor is based on a DPPD doped APCN, for real-time spectrophotometric detection of the oxidation product, and is formed in a 34 mu m thin film. The measurement principle presented here describes the NO2 concentration as a function of the temporal development of absorption at 450 nm. A linear relationship between the change of absorption and the concentration of NO2 at different humidity is obtained in the range from 0.1 to 5.0 ppm at ambient temperatures. As a consequence, the sensor response is reproducible with a very low detection threshold (20 ppb) and detection times within seconds. (C) 2013 Elsevier B.V. All rights reserved.
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