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Development of an iridium-based pH sensor for bioanalytical applications

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Abstract

A new iridium-based planar pH sensor for bioanalytical purposes is introduced. The fabrication of the sensor was carried out by a two-stage coating process of different iridium solutions on a platinum thick film surface. The pH response behaviour and the Nernstian characteristics of the double-layer electrode exhibited better results than the single iridium depositions. An almost theoretical Nernstian slope could be obtained as well as a pH response time of about 3 to 5 min in a pH range of 4.01 to 9.18. Furthermore, a biofilm growth of different microorganisms onto the iridium-coated electrodes could be achieved. Afterwards, the viability of the microorganisms was demonstrated via cell plating studies.

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Acknowledgements

Financial support by the Bundesministerium für Wirtschaft und Energie (BMWi) through the federation for industrial research (AiF) (IGF-project: 18150BG) is gratefully acknowledged.

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Authors and Affiliations

  1. Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Kurt-Schwabe-Straße 4, 04736, Waldheim, Germany

    S. Bause, M. Decker, F. Gerlach & W. Vonau

  2. Technische Universität Berlin, Chair of Bioprocess Engineering, Ackerstraße 76, 13355, Berlin, Germany

    S. Bause & P. Neubauer

  3. Hochschule Mittweida, Fachgruppe Fertigungs- und Werkstofftechnik, University of Applied Sciences, Technikumplatz 17, 09648, Mittweida, Germany

    J. Näther & F. Köster

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  1. S. Bause
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  2. M. Decker
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  3. F. Gerlach
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  4. J. Näther
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  5. F. Köster
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  6. P. Neubauer
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  7. W. Vonau
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Correspondence to S. Bause.

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Bause, S., Decker, M., Gerlach, F. et al. Development of an iridium-based pH sensor for bioanalytical applications. J Solid State Electrochem 22, 51–60 (2018). https://doi.org/10.1007/s10008-017-3721-1

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  • DOI: https://doi.org/10.1007/s10008-017-3721-1

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