Abstract
The multiple edge sites on 2D nanosheets or nanoplates usually supply more active sites which result in the enhancement of gas sensing performance. Manufacturing porous structure, with high density of edge sites coupled under the irradiation of UV light, have great potential in NO2 gas selectivity at room temperature. In this work, annealing engineered active edge sites of 2D SnO2 porous nanoplates were synthesized by a facile hydrothermal route. SnO2-600 2D semicircle nanoplates with small holes on its edge are attribute to their high sensitivity and selectivity to NO2 gas under the excitation of 365 nm UV light at room temperature. Density functional theory calculations show that the adsorption energy of −0.74 eV and the obvious variation in band gap before and after the interaction of NO2 on SnO2 (110). These results indicate high performance of gas sensitivity of SnO2 to NO2. The present studies provide useful strategies for the development of high selective room temperature SnO2-based NO2 sensors.
Graphical Abstract
Highlights
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The SnO2 porous nanoplates with multiple active edge sites were successfully synthesized by a feasible hydrothermal method via adjusting annealing temperature.
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The fabricated SnO2-600 sensor displayed excellent NO2-sensing performance with fast response and recovery properties with the aid of UV excitation at room temperature.
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The gas sensing mechanism and gas selectivity mechanism are investigated by density functional theory calculations.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (62171359), Shaanxi Provincial Education Department Serves Local Scientific Research Program (19JC020), industrial research project of Science and Technology Department of Shaanxi Province (2021GY-227).
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DT: Methodology, Writing—original draft, Writing—review & editing. YL: Supervision, Conceptualization. XY: conducting the DFT calculations. CY: Resources. LS: Resources. YM: Resources. DH: Supervision, Conceptualization. JY: Resources.
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Dong, T., Li, S., Chen, Y. et al. Annealing edge sites of porous SnO2 nanoplates for selective NO2 sensing: a combined experimental and theoretical study. J Sol-Gel Sci Technol 107, 608–619 (2023). https://doi.org/10.1007/s10971-023-06144-4
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DOI: https://doi.org/10.1007/s10971-023-06144-4