Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 202, Issue -, Pages 83-92Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.05.071
Keywords
Sensing mechanism; SnO2; Pt dopant; CO oxidation
Funding
- National Natural Science Foundation of China [11174070, 11147006]
- China Postdoctoral Science Foundation funded project [2012M521399]
- Postdoctoral Research sponsorship in Henan Province [2011038]
- Foundation for the Key Young Teachers of Henan Normal University
- Start-up Foundation for Doctors of Henan Normal University
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The oxidation process of CO on the Pt-doped SnO2 is studied using first-principles method based on the density functional theory. It is found that the Pt dopant prefers to substitute the 6-fold tin site and induces new electronic states near the Fermi energy, which will lower the electrical resistance of SnO2. The enhanced sensitivity can be attributed to both the chemical and electrical factors. In view of chemical factors, the presence of Pt facilitates the formation of oxygen vacancy and improves the oxygen ion activity, which will promote the CO oxidation. Besides, the adsorption of CO can be promoted by Pt doping, which favor the oxidation of CO. With respect to the electrical factors, compared with the undoped surface, the Pt-doped SnO2 surface get more electrons from the adsorbed CO, which plays roles in increasing the sensor's sensitivity. In addition, the recycle process of the Pt-6c/SnO2 surface is investigated. (C) 2014 Elsevier B.V. All rights reserved.
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