Analytical and Bioanalytical Chemistry

, Volume 387, Issue 8, pp 2863–2870 | Cite as

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

  • Špela Mojca Korent
  • Aleksandra Lobnik
  • Gerhard J. Mohr
Original Paper


We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETHT 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.


Optical sensor Sol-gel Amine detection 



This work was supported by DAAD grant no. A/05/02809, which is gratefully acknowledged.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Špela Mojca Korent
    • 1
  • Aleksandra Lobnik
    • 1
  • Gerhard J. Mohr
    • 2
  1. 1.Center of Sensor Technology, Faculty of Mechanical EngineeringUniversity of MariborMariborSlovenia
  2. 2.Institute of Physical ChemistryFriedrich Schiller University JenaJenaGermany

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