Sol-gel-based optical sensor for the detection of aqueous amines View Full Text


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Article Info

DATE

2007-04

AUTHORS

Špela Mojca Korent, Aleksandra Lobnik, Gerhard J. Mohr

ABSTRACT

We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETH(T) 4001) into sol-gel thin films. Acid- and base-catalyzed sol-gel processes were studied to prepare stable ormosil layers using various amounts of organically modified sol-gel precursor such as methyltriethoxysilane (MTriEOS). The sensor layers were coated with a protective layer of microporous white polytetrafluoroethylene (PTFE) in order to prevent interference from ions and ambient light. The measurements were carried out in a flow-through cell in the reflection mode. Acid-catalyzed ormosil layers (pH 1) based on the copolymerization of tetraethoxysilane (TEOS) and MTriEOS did not show any change in signal upon exposure to aqueous amine solutions, while base-catalyzed sensor layers (pH 3 and 13) showed significant changes in signal. The response time (t (100)) for the base-catalyzed sensor layer L3 (pH 13) upon exposure to different solutions containing 0-608 mmol L(-1) aqueous propylamine was 20-30 s, the regeneration time was 70 s and the detection limit was 0.1 mmol L(-1). The sensor response was reproducible and reversible. The porous ormosil layers permit dry sensor storage conditions. More... »

PAGES

2863-2870

References to SciGraph publications

  • 1994-01. Structure and properties of sol-gel coatings from methyltriethoxysilane and tetraethoxysilane in JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • 2000-06. A host-guest optical sensor for aliphatic amines based on lipophilic cyclodextrin in JOURNAL OF ANALYTICAL CHEMISTRY
  • 1998-01. Optimization of Ormosil Films for Optical Sensor Applications in JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • 2001-03. Probing the Polarity of Sol-Gels and Ormosils via the Absorption of Nile Red in JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • 1998-03. Development of an optical membrane for humidity in MICROCHIMICA ACTA
  • 2002-12. Enhanced Fluorescence Sensing Using Sol-Gel Materials in JOURNAL OF FLUORESCENCE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00216-007-1146-x

    DOI

    http://dx.doi.org/10.1007/s00216-007-1146-x

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/17377784


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