Influence of interfering gases on a carbon monoxide differential sensor based on SAW devices functionalized with cobalt and copper corroles

During the last decades, the potential impact of indoor air quality on human health has stimulated an interest in hazardous compounds survey such as carbon monoxide (CO). The detection of this compound has consequently become a vital need. To address this issue, we propose a Surface Acoustic Wave (SAW) device functionalized with metallocorroles used for the selective detection of CO. Here, we insist on the necessity to detect CO in the presence of interferents, such as O-2 that is obviously present in the air, CO2 present in significant quantity in urban area (400 ppm) and humidity (H2O) which is a well-known interferent in the case of SAW-based gas sensors. We report the interest of a differential configuration of the sensor that takes advantage of accurate organic layers, to lower the sensitivity to outer parameters as well as interferents. The sensitivity of the sensor under various conditions and the repeatability of the measurements are finally shown to assess the efficiency of our device.