Abstract
A highly sensitive mixed potential type gas sensor based on stabilized zirconia (YSZ) and CdMoO4 sensing electrode (SE) was developed and used for detection of acetone at 625°C. By comparing the sensing performance for different devices fabricated, the sensor utilizing CdMoO4-SE exhibited the highest response value (−133.5mV) to 100ppm acetone at 625°C, and even could achieve low detection limit of 500ppb at 625°C. The sensor attached with CdMoO4-SE displayed high sensitivity of −84mV/decade to acetone in the range of 5–300ppm at 625°C. The present device also showed good repeatability, selectivity to certain deleterious gases, moisture resistance and acceptable drifts in 10days measured period at 625°C, demonstrating great potential for practical application in acetone sensing detection. Additionally, the sensor involving mixed potential mechanism was proposed and further clarified by polarization curve.
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