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Investigation of doping effects of different noble metals for ethanol gas sensors based on mesoporous In2O3

机译：基于介孔IN2O3的乙醇气体传感器不同贵金属掺杂作用研究

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摘要

Elaborating the sensitization effects of different noble metals on In2O3 has great significance in providing an optimum method to improve ethanol sensing performance. In this study, long-range ordered mesoporous In2O3 has been fabricated through replicating the structure of SBA-15. Different noble metals (Au, Ag, Pt and Pd) with the same doping amount (1 at%) have been introduced by an in situ doping routine. The results of the gas sensing investigation indicate that the gas responses towards ethanol can be obviously increased by doping different noble metals. In particular, the best sensing performance towards ethanol detection can be achieved through Pd doping, and the sensors based on Pd-doped In2O3 not only possess the highest response (39.0-100 ppm ethanol) but also have the shortest response and recovery times at the optimal operating temperature of 250 degrees C. The sensing mechanism of noble metal doped materials can be attributed to the synergetic effect combining 'catalysis' and 'electronic and chemical sensitization' of noble metals. In particular, the chemical state of the noble metal also has a great influence on the gas sensing mechanism. A detailed explanation of the enhancement of gas sensing performance through noble metal doping is presented in the gas sensing mechanism part of the manuscript.
机译：阐述不同贵金属对In2O3的敏化效应，对于提供一种改善乙醇传感性能的最佳方法具有重要意义。在本研究中，通过复制SBA-15的结构，制备了长程有序介孔In2O3。通过原位掺杂程序引入了具有相同掺杂量（1 at%）的不同贵金属（Au、Ag、Pt和Pd）。气敏研究结果表明，掺杂不同的贵金属可以明显提高对乙醇的气敏响应。特别是，通过掺杂钯，可以实现对乙醇检测的最佳传感性能，基于掺杂钯的In2O3传感器不仅具有最高的响应（39.0-100ppm乙醇），而且在250℃的最佳工作温度下具有最短的响应和恢复时间。贵金属掺杂材料的传感机理可归因于贵金属的“催化”和“电子和化学敏化”的协同效应。特别是贵金属的化学状态对气敏机理也有很大影响。在手稿的气敏机理部分详细解释了通过贵金属掺杂提高气敏性能的方法。

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  • 来源
    《Nanotechnology》 |2021年第30期|共15页
  • 作者

    Cheng Pengfei; Wang Yinglin; Wang Chen; Ma Jian; Xu Luping; Lv Chao; Sun Yanfeng;

  • 作者单位

    Xidian Univ Sch Aerosp Sci &

    Technol Xian 710126 Peoples R China;

    Forschungszentrum Julich Inst Complex Syst Bioelect ICS 8 D-52425 Julich Germany;

    Xidian Univ Sch Aerosp Sci &

    Technol Xian 710126 Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

    Xidian Univ Sch Aerosp Sci &

    Technol Xian 710126 Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    noble metal; indium oxide; ethanol; gas sensing; sensing mechanism;

    机译：贵金属;氧化铟;乙醇气体传感;传感机构;

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