title: CO₂ Selective Potentiometric Sensor in Thick-film Technology.
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.
authors.affiliation: Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany. functional.materials@uni-bayreuth.de.
authors.forename: Kathy
authors.initials: K
authors.lastname: Sahner
authors.affiliation: Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Anne
authors.initials: A
authors.lastname: Schulz
authors.affiliation: Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Kita
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany.
authors.forename: Rotraut
authors.initials: R
authors.lastname: Merkle
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany.
authors.forename: Joachim
authors.initials: J
authors.lastname: Maier
authors.affiliation: Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Moos
keywords: Ion conductor; electrochemical sensor.; solid-state reference