Abstract
Abstract. A catalytic combustion-type carbon monoxide gas sensor exhibiting good sensing performance even at moderate temperatures was previously developed by employing a Pt loaded CeO2–ZrO2–SnO2 solid solution as the CO oxidizing catalyst. The addition of aluminum nitride as an intermediate heat transfer layer between the Pt coil and the CO oxidizing catalyst drastically accelerated the response of this device to CO at temperatures as low as 70 °C.
Highlights
Carbon monoxide (CO) is well known as a highly toxic gas which can act as a severe health hazard if inhaled, even at relatively low concentrations
Catalytic combustion-type sensors detect CO gas via changes in the resistance of the Pt coil, similar to the semiconductor-type sensors, selective CO gas detection can be realized by employing a catalyst that oxidizes only CO gas at a given temperature, since in such cases resistance changes are caused solely by the heat generated from combustion of CO gas on the catalyst loaded on the Pt coil
The sensor signal is completely proportional to the resistance change of the Pt coil during CO combustion and this resistance change is precisely correlated with the amount of CO gas oxidized by the catalyst
Summary
Carbon monoxide (CO) is well known as a highly toxic gas which can act as a severe health hazard if inhaled, even at relatively low concentrations. Catalytic combustion-type CO gas sensors have a simple detection system consisting of a Pt coil combined with a CO oxidation catalyst, resulting in both stable and rapid sensing performance over long periods of time.
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