Abstract
A low-cost CO 2 sensor in thick film technology has been developed using BaTiO 3 and various semiconducting oxides. The sensing principle of this new CO 2 sensor is based on changes in conductance of the metal oxides in the presence of carbon dioxide. In this report, effects of preparation parameters and effects of various additives on the sensitivity of the CO 2 sensor are described, and measurements of the sensor resistance as a function of CO 2 concentration are presented. The sensor is applicable over a wide range of CO 2 concentrations. Humidity changes have only minor effects on the sensor response.
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