Abstract
The effect of CdO doping on microstructure, conductance and gas-sensing properties of SnO 2-based sensors has been presented in this study. Precursor powders with Cd/Sn molar ratios ranging from 0 to 0.5 were prepared by chemical coprecipitation. X-ray diffraction (XRD) analysis indicates that the solid-state reaction in the CdO–SnO 2 system occurs and α-CdSnO 3 with pervoskite structure is formed between 600 and 650°C. CdO doping suppresses SnO 2 crystallite growth effectively which has been confirmed by means of XRD, transmission electron microscopy (TEM) and BET method. The 10 mol% Cd-doped SnO 2-based sensor shows an excellent ethanol-sensing performance, such as high sensitivity (275 for 100 ppm C 2H 5OH), rapid response rate (12 s for 90% response time) and high selectivity over CO, H 2 and i-C 4H 10. On the other hand, this sensor has good H 2-sensing properties in the absence of ethanol vapor. The sensor operates at 300°C, the sensitivity to 1000 ppm H 2 is up to 98, but only 16 and 7 for 1000 ppm CO and i-C 4H 10, respectively.
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