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Selective detection of ethanol vapor and hydrogen using Cd-doped SnO2-based sensors |
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| Authors: | Zhang Tianshu P Hing Yang Li and Zhang Jiancheng |
| Affiliation: | a Advanced Materials Research Centre, Division of Materials Engineering, School of Applied Science, Division of Materials Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore b Department of Ceramics and Glass Engineering, UIMC, University of Aveiro, 3810 Aveiro, Portugal c Department of Inorganic Materials, Shanghai University, 201800 Shanghai, China |
| Abstract: | The effect of CdO doping on microstructure, conductance and gas-sensing properties of SnO2-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–SnO2 system occurs and  -CdSnO3 with pervoskite structure is formed between 600 and 650°C. CdO doping suppresses SnO2 crystallite growth effectively which has been confirmed by means of XRD, transmission electron microscopy (TEM) and BET method. The 10 mol% Cd-doped SnO2-based sensor shows an excellent ethanol-sensing performance, such as high sensitivity (275 for 100 ppm C2H5OH), rapid response rate (12 s for 90% response time) and high selectivity over CO, H2 and i-C4H10. On the other hand, this sensor has good H2-sensing properties in the absence of ethanol vapor. The sensor operates at 300°C, the sensitivity to 1000 ppm H2 is up to 98, but only 16 and 7 for 1000 ppm CO and i-C4H10, respectively. |
| Keywords: | Tin dioxide CdO doping Ethanol sensor Hydrogen sensor |
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