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
Cite this article as:
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
Research Article

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

+ Author Affiliations
  • Corresponding authors:

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

    Sikai Zhao    E-mail: zhaosikai@mail.neu.edu.cn

  • Received: 7 August 2020Revised: 19 October 2020Accepted: 20 October 2020Available online: 21 October 2020
  • 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, PtOx (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.
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