Abstract
To improve the stability of a NASICON (; conductor)-based potentiometric sensor under humid conditions, a composite of and perovskite-type oxide was used as a solid-reference electrode. The sensing properties and stability of a NASICON-based planar device fitted with (auxiliary phase) and the composite reference electrode were examined under humid conditions. The planar device mounted on an alumina substrate with a Pt heater showed stable electromotive force (emf) responses to changes in the concentration (100–400 ppm) at 400 and in humid air without degradation. The sensor device also exhibited a good warming-up characteristic, i.e., the emf of the device quickly reached a steady and constant value when the sensor operation was restarted even after the sensor was exposed to humid air ( relative humidity at ) at room temperature for a long time.
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