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Controlled synthesis of urchin-like ZnSnO3/α-Fe2O3 hierarchical hollow microspheres with enhanced acetone gas sensing properties

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Abstract

Acetone, as one of the volatile organic compounds, is harmful to human health. Thus, fast detection at an early stage plays a vital role. ZnSnO3 shows the merit for a wide range responsivity to VOCs, but the pure ZnSnO3 has slow response-recovery speeds. Herein, the sensors based on urchin-like ZnSnO3/α-Fe2O3 hierarchical hollow microspheres were synthesized by a simple two-step liquid-phase reaction. Porous α-Fe2O3 nanowires with lengths of about 30 nm and diameters of around 2.5 nm were densely anchored on the surface of ZnSnO3 microspheres, forming “urchin-like” geometries, which increased the specific surface area and supplied more active sites for the fast adsorption–desorption of gas molecules. An excellent gas sensing response value (14.24) and ultra-fast response-recovery times (3/8 s) have been recorded in as-obtained urchin-like ZnSnO3/α-Fe2O3 composite sensors at 200 °C. Compared with the pure ZnSnO3 and α-Fe2O3 sensors, the ZnSnO3/α-Fe2O3 sensor displayed an obvious enhancement in gas sensing properties for acetone, which can be put down to high surface area, porous nanostructure, and the synergistic effect of ZnSnO3 and α-Fe2O3.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 51875330, 51975342) and the National Science Foundation of Shaanxi Province (Nos. 2018JZ5003, 2019JZ-24).

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Correspondence to Xiaohua Jia or Haojie Song.

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Zhang, J., Jia, X., Lian, D. et al. Controlled synthesis of urchin-like ZnSnO3/α-Fe2O3 hierarchical hollow microspheres with enhanced acetone gas sensing properties. J Mater Sci: Mater Electron 31, 15446–15455 (2020). https://doi.org/10.1007/s10854-020-04107-x

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