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Porous γ-Fe2O3 nanoparticle decorated with atomically dispersed platinum: Study on atomic site structural change and gas sensor activity evolution

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Abstract

Decorating semi-conducting metal oxide with noble metal has been recognized as a viable approach to improve the sensitivity of gas sensor. However, conventional method which relys on noble metal nanoparticles is confronted with drawback of significantly increased cost. To maximize the atom efficiency and reduce the cost for practical industrial application, designing sensor material with noble metal isolated single atom sites (ISAS) do** is a desired option. Here, we report an atomically dispersed platinum on one-dimensional arranged porous γ-Fe2O3 nanoparticle composites as highly efficient ethanol gas sensor. The optimized sample (Pt1-Fe2O3-ox) exhibited a high response (Ra/Rg = 102.4) and good selectivity to ethanol gas. It is demonstrated only the Pt single atom sites with high valance can effectively promote the adsorption capacity to ethanol and consequently enhance the sensitivity of sensing process by changing the electrical structure of Fe2O3 support. This work indicates the single atom sites could play a vital role in improving the performance of conventional metal oxides gas sensors and pave way for the exploration of ISAS-enhanced gas sensor for other volatile organic compounds (VOCs).

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Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2018YFA0702003), the National Natural Science Foundation of China (Nos. 21890383 and 21971137), Science and Technology Key Project of Guangdong Province of China (No. 2020B010188002) and Bei**g Municipal Science & Technology Commission (No. Z191100007219003).

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Authors and Affiliations

  1. Department of Chemistry, Tsinghua University, Bei**g, 100084, China

    Qiheng Li, Zhi Li, **ao Liang, Chen Chen, Dingsheng Wang, Qing Peng & Yadong Li

  2. School of Physical Sciences, University of Chinese Academy of Sciences, Bei**g, 100190, China

    Qinghua Zhang & Lin Gu

  3. Bei**g Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Bei**g, 100049, China

    Lirong Zheng

  4. National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei, 230029, China

    Wensheng Yan

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  1. Qiheng Li
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  2. Zhi Li
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  3. Qinghua Zhang
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Correspondence to Zhi Li or Yadong Li.

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Porous γ-Fe2O3 nanoparticle decorated with atomically dispersed platinum: Study on atomic site structural change and gas sensor activity evolution

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Li, Q., Li, Z., Zhang, Q. et al. Porous γ-Fe2O3 nanoparticle decorated with atomically dispersed platinum: Study on atomic site structural change and gas sensor activity evolution. Nano Res. 14, 1435–1442 (2021). https://doi.org/10.1007/s12274-020-3199-5

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