期刊
VACUUM
卷 204, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2022.111391
关键词
Nanocubes; Elemental doping; TEA; Gas sensor
资金
- National Natural Science Foundation of China [U1404613]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [T2019-1]
- Program for Innovative Research Team of Henan Polytechnic University [21IRTSTHN006]
- Program for Innovative Research Team in the Universities of Henan Province [162300410113]
- Natural Science Foundation of Henan Province of China [U1704255]
- [18HASTIT010]
This article investigates the gas sensing properties of Zn-doped alpha-Fe2O3 nanocubes for the detection of volatile organic compounds (VOCs). The Zn-doped nanocubes showed improved selectivity and sensitivity compared to the bare alpha-Fe2O3 nanocubes, and also demonstrated good stability and repeatability.
With the growing attention on environment protection, gas sensors fabricated with metal oxide semiconductor (MOS) have stimulated increasing research interest because of their capability for fast detection of various harmful gases. Here, Zn-doped alpha-Fe2O3 nanocubes (ZFO NCs) with about 300-500 nm in edge length were successfully prepared via a surfactant-free hydrothermal route and their gas sensing properties were investigated by using as bare alpha-Fe2O3 NCs as reference. It was found that as applied as active materials for detecting volatile organic compounds (VOCs), the obtained ZFO NCs showed some impressively improved triethylamine (TEA) sensing performances, especially of better selectivity and higher sensitivity. The response (Ra/Rg) of the best ZFO sensor (ZFO-5) to 100 ppm TEA was as high as 64.3, and its selectivity coefficient (STEA/Ammonia) was 6.50, both of which were well above that of the pure alpha-Fe2O3 sensor. Besides, the ZFO-5 sensor also shows good stability and repeatability. The gas sensitive mechanism of the ZFO NCs was discussed.
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