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Optochemical sensor for determining ozone based on novel soluble indigo dyes immobilised in a highly permeable polymeric film

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Abstract

An optochemical ozone sensor is described that has been manufactured by immobilisation of novel soluble indigo derivatives in permeable transparent polymeric films of polydimethylsiloxane–polycarbonate copolymer. From a number of investigated indigo derivatives, 4,4′,7,7′-tetraalkoxyindigo 9 has been selected for optimal sensitivity and specificity of ozone detection. A linear calibration for ozone can be obtained in the range between 0.01 and 0.5 ppm. The limit of quantitation is 0.03 ppm, and the accuracy exceeds 8%. It takes about 134 s to measure the relatively low occupational exposure concentration of 0.1 ppm. A reduction of the sensor response time could be achieved through application of double-sided coated sensors instead of single-sided variants. The stability of the sensors and the effect of external parameters like relative humidity (RH), temperature and gas flow on the sensor response have been investigated. The sensor response is affected by varying the gas flow or temperature; however, humidity in the range between 0 and 90% RH does not affect sensor response. The indigo derivative 9 remained stable inside the polymeric film and no chemical reaction, crystallisation or leaching occurred during 10 months of observation. Proper choice of indicator dye and polymeric material and successful application of kinetic evaluation method for the exposure experiments determine the desired features of the sensor.

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Acknowledgements

Financial support by the German Research Foundation (DFG) and the Fonds der Chemischen Industrie is gratefully acknowledged.

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Authors and Affiliations

  1. Freiburg Materials Research Center, Stefan-Meier-Strasse 21, 79104, Freiburg, Germany

    Marcin Alexy & Jürgen Heinze

  2. Department of Bioorganic Chemistry, University of Bayreuth, 95440, Bayreuth, Germany

    Gundula Voss

Authors
  1. Marcin Alexy
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  2. Gundula Voss
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  3. Jürgen Heinze
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Correspondence to Jürgen Heinze.

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Alexy, M., Voss, G. & Heinze, J. Optochemical sensor for determining ozone based on novel soluble indigo dyes immobilised in a highly permeable polymeric film. Anal Bioanal Chem 382, 1628–1641 (2005). https://doi.org/10.1007/s00216-005-3291-4

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  • DOI: https://doi.org/10.1007/s00216-005-3291-4

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