期刊
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
卷 191, 期 -, 页码 41-50出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2014.10.007
关键词
Spray pyrolysis; ZnO; Cobalt; Thin films; Gas sensor; Ammonia
资金
- Department of Science & Technology, New Delhi, India [INT/SWD/VINN/P-04/2011, SR/FST/ETI-284/2011(C)]
Ammonia sensing characteristics of undoped and cobalt (Co)-doped nanostructured ZnO thin films were investigated. Polycrystalline nature with hexagonal wurtzite structure and high crystalline quality with dominant (0 0 2) plane orientation of Co-doped ZnO film were confirmed by the X-ray diffractogram. Scanning electron micrographs of the undoped film demonstrated the uniform deposition of sphere-shaped grains. But, smaller particles with no clear grain boundaries were observed for Co-doped ZnO thin film. Band gap values were found to be 3.26 eV and 3.22 eV for undoped and Co-doped ZnO thin films. Ammonia sensing characteristics of Co-doped ZnO film at room temperature were investigated in the concentration range of 15-1000 ppm. Variation in the sensing performances of Co-doped and pure ZnO thin films has been analyzed and compared. (C) 2014 Elsevier B.V. All rights reserved.
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