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Porous LaFeO3 microspheres decorated with Au nanoparticles for superior formaldehyde gas-sensing performances

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Abstract

Formaldehyde is one of the most serious pollutants of volatile organic compounds in indoor environment. The monitoring of formaldehyde concentration of the indoor environment has become an urgent issue in modern society. In this paper, a facile wet-chemical method was used to prepare the catalytic Au nanoparticle-functionalized LaFeO3 porous microspheres with high formaldehyde (HCHO)-sensing performances. The Au/LaFeO3 nanocomposites were characterized by several common testing methods, such as XRD, SEM, EDS, TEM, and XPS. The results showed that Au nanoparticles were uniformly attached to the surface of porous LaFeO3 microspheres. And the gas-sensing experiments showed that Au nanoparticle-functionalized porous LaFeO3 microspheres showed high response even at low concentration (1 ppm), good selectivity, good reproducibility, and ultrafast response (2 s) and recovery (9 s) to formaldehyde. Therefore, the successful preparation of Au/LaFeO3 nanocomposites is expected to be used in the rapid detection of formaldehyde gas.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 61102006 and 51672110) and Natural Science Foundation of Shandong Province, China (Nos. ZR2018LE006 and ZR2015EM019).

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  1. School of Material Science and Engineering, University of Jinan, Jinan, 250022, China

    Pei Hao, Peng Song, Zhongxi Yang & Qi Wang

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  1. Pei Hao
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Hao, P., Song, P., Yang, Z. et al. Porous LaFeO3 microspheres decorated with Au nanoparticles for superior formaldehyde gas-sensing performances. J Mater Sci: Mater Electron 31, 4632–4641 (2020). https://doi.org/10.1007/s10854-020-03015-4

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