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CO₂ Selective Potentiometric Sensor in Thick-film Technology
Kathy Sahner1, Anne Schulz2, Jaroslaw Kita2
1Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany. functional.materials@uni-bayreuth.de.
Abstract:
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.
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