Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 134, Issue 1, Pages 133-139Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.04.018
Keywords
Au-doped WO3; Gas sensor; NO2; Structural characterization; Low temperature
Funding
- National Nature Science Foundation of China [20771061]
- 973 program [2005CB623607]
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Pure and Au-doped WO3 powders for NO2 gas detection were prepared by a colloidal chemical method, and characterized via X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The NO2 sensing properties of the sensors based on pure and Au-doped WO3 powders were investigated by HW-30A gas sensing measurement. The results showed that the gas sensing properties of the doped WO3 sensors were superior to those of the undoped one. Especially, the 1.0 wt% Au-doped WO3 sensor possessed larger response, better selectivity, faster response/recovery and better longer term stability to NO2 than the others at relatively low operating temperature (150 degrees C). (C) 2008 Elsevier B.V. All rights reserved.
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