期刊
APPLIED SURFACE SCIENCE
卷 550, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149368
关键词
NiO NSs; g-C3N4; Heterojunction; NO2 gas sensors; Ppb level
类别
资金
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- National Natural Science Foundation of China [2167010747, 21671060]
- International Cooperation in Science and Technology Projects of China [2014DFR40480]
- Applied Technology Research and Development Program Foreign Cooperation Project of Heilongjiang Province [WB15C101]
- Program for Key Laboratory of Functional Inorganic Material Chemistry
A high-performance and cost-effective NO2-based gas sensor of metal oxides operating at room temperature was developed using a design strategy that combines two-dimensional graphitic carbon nitride and nickel oxide nanosheets to create a three-dimensional hierarchical nanostructure. The optimized nanocomposite showed long-term stability, a low detection limit, and higher selectivity towards NO2 gas. This study provides a new strategy for the formation of heterostructures between metal oxides and g-C3N4 for excellent gas sensitivity and addresses the fabrication of highly potent gas sensors.
High-performance and cost-effective NO2-based gas sensors of metal oxides that operate at room temperature (RT) are of immense importance. A design strategy of a three-dimensional hierarchical nanostructure formed by the combination of two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets that are decorated with nickel oxide (NiO) nanosheets (NSs) via a facile hydrothermal method has been investigated here. The asfabricated nanocomposite (g-C3N4/NiO, NiCN) sensor showed high sensing performance toward NO2 gas with a maximal sensitivity of 25.4 to 50 ppm, fast response time (0.53 s) and quick recovery time (25.06 s). Furthermore, the optimized nanocomposite structure (NiCN-2) showed long-term stability (12 weeks), a low detection limit (10 ppb) and higher selectivity toward NO2 gas at RT. This exceptional sensing performance of the NiCN-2 sensor toward NO2 might be attributed to the unique 3D hierarchical structures with a large specific surface area (146.8 m(2).g(-1)), highly porous surface, abundant defect sites, extended internal charge transfer between the p-n heterojunction and high adsorption and transportation rates in the nanocomposite sensor. This study provides a new strategy for the formation of heterostructures between metal oxides and g-C3N4 for excellent gas sensitivity and addresses the fabrication of highly potent gas sensors.
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