期刊
APPLIED SURFACE SCIENCE
卷 330, 期 -, 页码 126-133出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2014.12.194
关键词
Li doped ZnO; Methanol and formaldehyde; Defect chemistry; Temperature dependent conductivity
类别
资金
- Nature Science Foundation of China [51204072, 50927201]
- National Basic Research Program of China [2009CB939705, 2009CB939702]
Li doped ZnO (Zn1-xLixO) nanoparticles with different content were synthesized. X-ray photoelectron spectroscopy (XPS) indicated that the ratio of oxygen to zinc for ZnO increased with increasing of Li content from x = 0 to 0.2, which had been attributed to the introduction of oxygen interstitial by Li dopant. The sensing performance and the temperature-dependent conductivity were investigated. It is observed that Li doped ZnO showed higher sensitivity and selectivity compared to the undoped ZnO. The 0.1 Li doped ZnO performed the maximum responses of 71.5 and 40.2 for 100 ppm methanol and formaldehyde, respectively, at 350 degrees C. The research showed that the oxygen vacancies served as active sites which supported the oxygen adsorption and reaction, oxygen interstitials served as active sites to oxidize the reducing gases and produce electrons. The enhanced sensing performance of Li doped ZnO was attributed to the synergistic effect of oxygen interstitials and oxygen vacancies. (C) 2015 Elsevier B.V. All rights reserved.
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