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Sensors 2008, 8(8), 4774-4785; doi:10.3390/s8084774

CO2 Selective Potentiometric Sensor in Thick-film Technology

1,* , 1, 1, 2, 2 and 1
1 Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany 2 Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
* Author to whom correspondence should be addressed.
Received: 2 July 2008 / Revised: 8 August 2008 / Accepted: 8 August 2008 / Published: 19 August 2008
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A potentiometric sensor device based on screen-printed Nasicon films was investigated. In order to transfer the promising sensor concept of an open sodium titanate reference to thick film technology, “sodium-rich” and “sodium-poor” formulations were compared. While the “sodium-rich” composition was found to react with the ion conducting Nasicon during thermal treatment, the “sodium-poor” reference mixture was identified as an appropriate reference composition. Screen-printed sensor devices were prepared and tested with respect to CO2 response, reproducibility, and cross-interference of oxygen. Excellent agreement with the theory was observed. With the integration of a screen-printed heater, sensor elements were operated actively heated in a cold gas stream.
Keywords: Ion conductor; solid-state reference; electrochemical sensor. Ion conductor; solid-state reference; electrochemical sensor.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sahner, K.; Schulz, A.; Kita, J.; Merkle, R.; Maier, J.; Moos, R. CO2 Selective Potentiometric Sensor in Thick-film Technology. Sensors 2008, 8, 4774-4785.

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