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Research Article

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

Qiheng Li1, Zhi Li1( ), Qinghua Zhang2, Lirong Zheng3, Wensheng Yan4, Xiao Liang1, Lin Gu2, Chen Chen1, Dingsheng Wang1, Qing Peng1, Yadong Li1( )
Department of Chemistry, Tsinghua University, Beijing 100084, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei 230029, China
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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) doping 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).

Keywords

nanocompositesgas sensorisolated single atom sitesstructure-activity relationship

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1435-1442
DOI: 10.1007/s12274-020-3199-5
Cite this article:
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 Research, 2021, 14(5): 1435-1442. https://doi.org/10.1007/s12274-020-3199-5
Topics:
Chemical sensors Petroleum prospectingPlatinum

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Received: 03 August 2020
Revised: 17 September 2020
Accepted: 20 October 2020
Published: 15 November 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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