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CO2 Selective Potentiometric Sensor in Thick-film Technology
Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany
Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
* Author to whom correspondence should be addressed.
Received: 2 July 2008; in revised form: 8 August 2008 / Accepted: 8 August 2008 / Published: 19 August 2008
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.
Keywords: Ion conductor; solid-state reference; electrochemical sensor.
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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.
Sahner K, Schulz A, Kita J, Merkle R, Maier J, Moos R. CO2 Selective Potentiometric Sensor in Thick-film Technology. Sensors. 2008; 8(8):4774-4785.
Sahner, Kathy; Schulz, Anne; Kita, Jaroslaw; Merkle, Rotraut; Maier, Joachim; Moos, Ralf. 2008. "CO2 Selective Potentiometric Sensor in Thick-film Technology." Sensors 8, no. 8: 4774-4785.