Enhanced detection of ppb-level NO<sub>2</sub> by uniform Pt-doped ZnSnO<sub>3</sub> nanocubes

Yaoyu Yin; Yanbai Shen; Sikai Zhao; Ang Li; Rui Lu; Cong Han; Baoyu Cui; Dezhou Wei

doi:10.1007/s12613-020-2215-9

Volume 29 Issue 6

Jun. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(6): 1295-1303

Yaoyu Yin, Yanbai Shen, Sikai Zhao, Ang Li, Rui Lu, Cong Han, Baoyu Cui, and Dezhou Wei, Enhanced detection of ppb-level NO₂ by uniform Pt-doped ZnSnO₃ nanocubes, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1295-1303. https://doi.org/10.1007/s12613-020-2215-9

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Yaoyu Yin, Yanbai Shen, Sikai Zhao, Ang Li, Rui Lu, Cong Han, Baoyu Cui, and Dezhou Wei, Enhanced detection of ppb-level NO2 by uniform Pt-doped ZnSnO3 nanocubes, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1295-1303. https://doi.org/10.1007/s12613-020-2215-9

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Research Article

Enhanced detection of ppb-level NO₂ by uniform Pt-doped ZnSnO₃ nanocubes

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Corresponding authors:
Yanbai Shen E-mail: shenyanbai@mail.neu.edu.cn

Sikai Zhao E-mail: zhaosikai@mail.neu.edu.cn
Received: 7 August 2020; Revised: 19 October 2020; Accepted: 20 October 2020; Available online: 21 October 2020

Abstract

Abstract

ZnSnO₃ nanocubes (ZSNCs) with various Pt concentrations (i.e., 1at%, 2at%, and 5at%) were synthesized by a simple one-pot hydrothermal method. The microstructures of pure and Pt-doped ZSNCs were characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Results showed that the pure ZSNCs have a perovskite structure with a side length of approximately 600 nm; this length was reduced to 400 nm after Pt doping. Following doping, PtO_x (PtO and PtO₂) nanoparticles with a diameter of approximately 5 nm were uniformly coated on the surface of the ZSNCs. Systematic investigation of the gas-sensing abilities of the nanocubes showed that the Pt-doped ZSNCs have excellent sensing properties toward nitrogen dioxide (NO₂) gas in the operating temperature range of 75–175°C. Among the sensors prepared, that based on 1at% Pt-doped ZSNCs exhibited the best response of 16.0 toward 500 ppb NO₂ at 125°C; this response is over 11 times higher compared with that of pure ZSNCs. The enhanced NO₂ sensing mechanism of the Pt-doped ZSNCs may be attributed to the synergistic effects of catalytic activity and chemical sensitization by Pt doping.
- ZnSnO₃ nanocubes;
- Pt doping;
- nitrogen dioxide;
- gas sensor

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