Sensitivity enhancement of catalytic combustion-type CO gas sensor using an artificial diamond with Pt-loaded CeO2-ZrO2-ZnO based catalyst

Catalytic combustion-type CO gas sensors employing the mixture of Pt-loaded CeO2-ZrO2-ZnO catalyst and artificial diamond with high thermal conductive nature were successfully fabricated. While the sensor employing only Pt-loaded CeO2-ZrO2-ZnO catalyst exhibited CO sensing performance over 100 degrees C with high electrical noise, the sensor with the mixture of artificial diamond and the catalyst could operate even at 80 degrees C and the electrical noise was also reduced. At the same operating temperature at 130 degrees C at which both sensors showed the highest sensitivity, the 50% response time toward CO gas concentration change was accelerated from 103 s for the sensor without artificial diamond to 76 s by using the sensor with artificial diamond. Furthermore, the sensitivity toward CO gas was also increased. (C) 2018 The Ceramic Society of Japan. All rights reserved.