期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 245, 期 -, 页码 551-559出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.01.148
关键词
ZnO/SnO2 composite; Hollow spheres; Heterojunction; Gas sensor; High performance; Low detection limit
资金
- National Nature Science Foundation of China [61520106003, 61503148, 61327804, 61374218, 61134010]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National High-Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
- China Postdoctoral Science Foundation funded project [2015M580247]
- National Key Research and Development Program [2016YFC0207300]
Heterostructure ZnO/SnO2 composites material with a hollow nanostructure was synthesized by solution method. The obtained products were characterized by X-ray diffraction (XRD), field-emission electron scanning microscopy (FESEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results indicated that ZnO nanoparticles could be clearly observed on the surface of SnO2 hollow spheres and the surface oxygen chemisorbed ability of ZnO/SnO2 composites was much higher than that of single-component SnO2. The as-synthesized composites as sensing material was investigated and the results revealed that such composites had an excellent sensing performance to ethanol, and the response to 30 ppm ethanol was nearly 7-times higher than that of pristine SnO2 at its optimum temperature. Moreover, it is noteworthy that such gas sensor showed a low detection limit (ppb-level). The enhanced sensing properties might be attributed to the formation of heterojunction and synergistic effect between SnO2 and ZnO. (C) 2017 Elsevier B.V. All rights reserved.
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