Carbon Dioxide Sensor Consisting of  K 2 CO 3 ‐ Polyethylene Glycol Solution Supported on Porous Ceramics: I . Measurements of Carbon Dioxide Sensing Characteristics

Abstract

gas sensing characteristics of sensor elements consisting of glycol solution supported on porous alumina ceramics have been investigated as a function of the amount of the solution supported, microstructure of the ceramics, the kind of the electrode materials, and the method for measuring resistance changes of the elements. When Au was employed as the electrode material and an appropriate amount of the solution was supported, the sensor elements responded to with sufficient reproducibility at room temperature, exhibiting an increase in resistance after exposure to under an applied voltage of dc 1.0V. In addition, a linear relationship existed between the sensitivity and the concentration of from 1 to 9%. From these results, it was confirmed that the elements exhibited promising properties for realizing a new type of gas sensor.