期刊
APPLIED SURFACE SCIENCE
卷 261, 期 -, 页码 890-895出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.08.118
关键词
Zn-doped SnO2; Hollow microspheres; C2H5OH; Gas sensor
类别
资金
- National Natural Science Foundation of China [10574112, 50602040]
- Science and Technology Project on Key Problems of Henan Province [082101510007]
Zn-doped SnO2 porous hollow microspheres with an average diameter of similar to 180 nm have been prepared by a direct precipitation method using colloidal carbon sphere as template. The XRD data disclosed that the structure of the Zn-doped SnO2 microspheres was the same as pure SnO2, while the crystallite size of Zn-doped SnO2 microspheres (10.63 nm) was smaller than SnO2 (23.2 nm). The sensing measurement showed that the response (R-a/R-g) increased near linearly with the ethanol gas concentration at the operating temperature of 240 degrees C. Compared with SnO2 microspheres, Zn-doped SnO2 porous hollow spheres exhibited a significant improvement for the response towards ethanol at 240 degrees C. The response of Zn-doped SnO2 microspheres was up to 3 when the sensor was exposed to 2 ppm C2H5OH, with the response and recovery times of 7 and 4 s, respectively. Additionally, the response of Zn-doped SnO2 sensor showed slight variation after 15 weeks storage. The results indicated that Zn-doped SnO2 microspheres are of great potential for fabricating C2H5OH sensors with high performance. (C) 2012 Elsevier B. V. All rights reserved.
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