期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 152, 期 2, 页码 324-329出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.12.029
关键词
Formaldehyde sensor; Sn-doped ZnO; CdO; Sensitive; Selective; Stability
资金
- National Natural Science Foundation of China [90406024]
- National 863 Program [2007AA061401]
Sn-, Ni-, Fe- and Al-doped ZnO and pure ZnO are prepared by coprecipitation method, and characterized by scanning electron microscope (SEM), energy diffraction spectra (EDS) and X-ray diffraction (XRD). Their formaldehyde gas sensing properties are evaluated and the results show that 2.2 mol% Sn dopant can increase the response of ZnO by more than 2 folds, while other dopants increase little response or even decrease response. Further, CdO is used to activate ZnO based formaldehyde sensing material. It is demonstrated that 10 mol% CdO activated 2.2 mol% Sn-doped ZnO has the highest formaldehyde gas response, with a linear sensitivity of similar to 10/ppm at lowered work temperature of 200 degrees C than 400 degrees C of pure ZnO, and high selectivity over toluene, CO and NH3, as well as good stability tested in 1 month. (C) 2011 Published by Elsevier B.V.
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