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One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In2O3 (Cu-In2O3) hollow nanofibers by electrospinning and calcination for detecting H2S. The experimental results show that the Cu doping concentration besides the operating temperature, gas concentration, and relative humidity can greatly affect the H2S sensing performance of the In2O3-based sensors. In particular, the responses of 6%Cu-In2O3 hollow nanofibers are 350.7 and 4201.5 to 50 and 100 ppm H2S at 250 ℃, which are over 20 and 140 times higher than those of pristine In2O3 hollow nanofibers, respectively. Moreover, the corresponding sensor exhibits excellent selectivity and good reproducibility towards H2S, and the response of 6%Cu-In2O3 is still 1.5 to 1 ppm H2S. Finally, the gas sensing mechanism of Cu-In2O3 hollow nanofibers is thoroughly discussed, along with the assistance of first-principles calculations. Both the formation of hollow structure and Cu doping contribute to provide more active sites, and meanwhile a little CuO can form p-n heterojunctions with In2O3 and react with H2S, resulting in significant improvement of gas sensing performance. The Cu-In2O3 hollow nanofibers can be tailored for practical application to selectively detect H2S at lower concentrations.


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Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

Show Author's information Yu ZHANGaShuai HANaMingyuan WANGbSiwei LIUaGuiwu LIUa( )Xianfeng MENGaZiwei XUaMingsong WANGaGuanjun QIAOa
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electrical Science and Engineering, Southeast University, Nanjing 210096, China

† Yu Zhang, Shuai Han, and Mingyuan Wang contributed equally to this work.

Abstract

One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In2O3 (Cu-In2O3) hollow nanofibers by electrospinning and calcination for detecting H2S. The experimental results show that the Cu doping concentration besides the operating temperature, gas concentration, and relative humidity can greatly affect the H2S sensing performance of the In2O3-based sensors. In particular, the responses of 6%Cu-In2O3 hollow nanofibers are 350.7 and 4201.5 to 50 and 100 ppm H2S at 250 ℃, which are over 20 and 140 times higher than those of pristine In2O3 hollow nanofibers, respectively. Moreover, the corresponding sensor exhibits excellent selectivity and good reproducibility towards H2S, and the response of 6%Cu-In2O3 is still 1.5 to 1 ppm H2S. Finally, the gas sensing mechanism of Cu-In2O3 hollow nanofibers is thoroughly discussed, along with the assistance of first-principles calculations. Both the formation of hollow structure and Cu doping contribute to provide more active sites, and meanwhile a little CuO can form p-n heterojunctions with In2O3 and react with H2S, resulting in significant improvement of gas sensing performance. The Cu-In2O3 hollow nanofibers can be tailored for practical application to selectively detect H2S at lower concentrations.

Keywords:

electrospinning, Cu-doped In2O3, hollow nanofibers, H2S detection
Received: 12 July 2021 Revised: 28 September 2021 Accepted: 01 October 2021 Published: 06 January 2022 Issue date: March 2022
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Publication history

Received: 12 July 2021
Revised: 28 September 2021
Accepted: 01 October 2021
Published: 06 January 2022
Issue date: March 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the Key Research and Development Plan (BE2019094), Qing Lan Project ([2016]15), Six Talent Peaks Project (TD-XCL-004), and Graduate Research and Innovation Projects (5561220038) of Jiangsu Province. We are grateful for computational support from the High Performance Computing Platform of Jiangsu University, the Big Data Center of Southeast University, and the Advanced Computing East China Sub-center.

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