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In order to detect low concentrations of volatile organic compounds (VOCs) for the early diagnosis of lung cancer, sensors based on hollow spheres of In2O3 were prepared through the soft template method. Ag nanoparticle decorated In2O3 composites were synthesized via dipping and annealing. The microstructure, phase composition, element distribution, and state of Ag were analyzed by the scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The gas sensing tests showed that Ag-In2O3 sensors had the highest response to isopropanol at 300 ℃. The best response of Ag-In2O3 composite sensor was 5.2, which had a significant improvement compared with only In2O3. Moreover, the response and recovery time of Ag-In2O3 composite sensor was significantly shortened. The improved sensing properties of Ag-In2O3 composite sensor could be attributed to the Schottky barrier created at Ag-In2O3 interface and catalytical effect of Ag.


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Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

Show Author's information Chao ZHANGa( )Yunchun HUANaYing LIaYifan LUOa,bMarc DEBLIQUYb
College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
Materials Science Department, University of Mons, Mons 7000, Belgium

Abstract

In order to detect low concentrations of volatile organic compounds (VOCs) for the early diagnosis of lung cancer, sensors based on hollow spheres of In2O3 were prepared through the soft template method. Ag nanoparticle decorated In2O3 composites were synthesized via dipping and annealing. The microstructure, phase composition, element distribution, and state of Ag were analyzed by the scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The gas sensing tests showed that Ag-In2O3 sensors had the highest response to isopropanol at 300 ℃. The best response of Ag-In2O3 composite sensor was 5.2, which had a significant improvement compared with only In2O3. Moreover, the response and recovery time of Ag-In2O3 composite sensor was significantly shortened. The improved sensing properties of Ag-In2O3 composite sensor could be attributed to the Schottky barrier created at Ag-In2O3 interface and catalytical effect of Ag.

Keywords:

Ag-In2O3, hollow spheres, isopropanol, gas sensor
Received: 22 May 2021 Revised: 22 August 2021 Accepted: 25 August 2021 Published: 11 February 2022 Issue date: March 2022
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Publication history
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Publication history

Received: 22 May 2021
Revised: 22 August 2021
Accepted: 25 August 2021
Published: 11 February 2022
Issue date: March 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51872254), the National Key R&D Program of China (No. 2017YFE0115900), and the Outstanding Youth Foundation of Jiangsu Province of China (No. BK20211548). The authors also thank the European Regional Development Fund (ERDF) and the Walloon Region of Belgium through the Interreg V France-Wallonie-Vlaanderen program, PATHACOV project (No. 1.1.297), the Micro project co-funded by the European Regional Development Fund (ERDF), and Wallonia, Belgium (No. 675781-642409). This work is also supported by the Communauté Wallonie-Bruxelles via the WBI-MOST-China (No. SUB/2019/430254).

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