期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 220, 期 -, 页码 59-67出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.05.037
关键词
Hydrothermal; W-doped NiO; Hierarchical; Acetone; Gas sensor
资金
- National Natural Science Foundation of China [61374218, 61134010, 61474057, 61304242, 61377058, 61327804]
- Program for ChangJiang Scholars and Innovative Research Team in University [IRT13018]
- National High-Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
The pristine and W-doped NiO hierarchical flower-like hollow spheres were prepared by a one-step hydrothermal reaction without template and used to fabricate the gas sensors. Their gas sensing performances and possible sensitive mechanism were investigated. The results indicated that the strategy of doping W into NiO could effectively improve the gas sensing properties. The sensor based on the 4.0 at% W-doped NiO exhibited the optimal gas sensing performance, giving a ppb-level detection limit and an ultra-high response of 198.1 to 100 ppm acetone at 250 degrees C, which was about 139 times higher than that of the pristine NiO. The significantly enhanced sensing properties to acetone could be attributed to the changes in crystallite size, specific surface area, and hole carrier concentration caused by W doping. (C) 2015 Elsevier B.V. All rights reserved.
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