CO2 Selective Potentiometric Sensor in Thick-film Technology

Titelangaben

Sahner, Kathy ; Schulz, Anne ; Kita, Jaroslaw ; Merkle, Rotraut ; Maier, Joachim ; Moos, Ralf:
CO2 Selective Potentiometric Sensor in Thick-film Technology.
In: Sensors. Bd. 8 (2008) Heft 8 . - S. 4774-4785.
ISSN 1424-8220
DOI: https://doi.org/10.3390/s8084774

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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.