期刊
CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132813
关键词
WO3-Bi2WO6; Hierarchical microflowers; Heterojunction; Gas sensor; H2S
资金
- Natural Science Foundation of China [51872254]
- National Key Research and Development Program of China [2017YFE0115900]
- Outstanding Youth Foundation of Jiangsu Province of China [BK20211548]
Pristine Bi2WO6 nanosheets and hierarchical WO3-Bi2WO6 microflowers were successfully prepared via a simple hydrothermal technique, with the latter demonstrating superior H2S sensing properties at room temperature. The 20 WO3-Bi2WO6 microflowers sensor showed the best performance towards ppb-level H2S detection compared to other samples, making it a promising material for environmental monitoring and fish freshness detection.
Pristine Bi2WO6 nanosheets and hierarchical WO3-Bi2WO6 microflowers were prepared via a facile hydrothermal technique. WO3-Bi2WO6 microflowers were assembled with thin nanosheets, where WO3 nanoparticles were uniformly loaded. The H2S sensing properties of pristine Bi2WO6 nanosheets and hierarchical WO3-Bi2WO6 microflowers were systematically investigated at room temperature. 20 WO3-Bi2WO6 microflowers sensor displayed the best sensing property towards ppb-level H2S compared with all other samples. The enhancement was ascribed to the catalytic effect of WO3 nanoparticles and the modified microstructure with large specific surface areas. Moreover, the n-n heterojunction structures also increase the thickness of electron depletion layer and potential barrier height, which could efficiently improve the sensing properties. The practical application of 20 WO3-Bi2WO6 microflowers sensor in detecting the volatiles of Pangasius was also studied in this work. Therefore, the hierarchical WO3-Bi2WO6 microflower is a promising ppb-level H2S sensing material for environment monitoring and fish freshness detection.
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