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过程工程学报 ›› 2022, Vol. 22 ›› Issue (4): 515-522.DOI: 10.12034/j.issn.1009-606X.221136

• 研究论文 • 上一篇    下一篇

基于镍铟水滑石的含异质结材料在甲苯检测中的应用

聂林峰1,2， 韩宁1,3*， 陈运法1,3   

  1. 1. 中国科学院过程工程研究所多相复杂系统国家重点实验室，北京 100190 2. 中国科学院大学化学工程学院，北京 100049 3. 中国科学院城市环境研究所区域大气环境研究卓越创新中心，福建 厦门 361021
  • 收稿日期:2021-04-26 修回日期:2021-06-01 出版日期:2022-04-28 发布日期:2022-04-24
  • 通讯作者: 韩宁 nhan@ipe.ac.cn
  • 作者简介:聂林峰(1996-)，男，安徽省安庆市人，硕士研究生，E-mail: lfnie@ipe.ac.cn；韩宁，通讯联系人，E-mail: nhan@ipe.ac.cn.
  • 基金资助:
    国家重点研发计划

Application of heterojunctioned materials based on NiIn?LDHs for toluene detection

Linfeng NIE1,2,  Ning HAN1,3*,  Yunfa CHEN1,3   

  1. 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 2. College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China
  • Received:2021-04-26 Revised:2021-06-01 Online:2022-04-28 Published:2022-04-24
  • Contact: Ning HAN nhan@ipe.ac.cn

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摘要： 构建异质结构是提高气体传感器性能的有效方法之一。本工作通过在空气中高温煅烧不同Ni/In摩尔比的镍铟水滑石(NiIn-LDHs)合成了一系列含NiO-In2O3异质结的材料，通过氢气退火处理后，应用于甲苯气体检测。结果表明，当Ni/In为3.0，退火温度为500℃时，所得材料对0.005‰甲苯具有最高响应。此外，该材料还表现出针对其他干扰气体(如氨气、丙酮、高湿度水汽、三乙胺和二氧化硫)的高选择性和12天的连续测试的高稳定性。通过XPS、UPS等一系列表征证实，退火后形成的材料Ni/NiO-In2O3中存在肖特基能垒以及较多的氧空位，与P-N结的协同效应共同导致了其具有最佳气敏性能。

关键词: 水滑石, 异质结, 气体传感器, 甲苯

Abstract: Nowadays, people have paid more and more attention to air pollution which urging researchers to explore different high-performance gas sensors for air quality monitoring. As a representative of air pollution, volatile organic compounds (VOCs) have been studied a lot. Plenty of work about VOCs gas sensors and how to enhance gas sensing performance has been reported. Constructing a heterojunction structure in gas sensor material was considered to be one of the effective methods to improve the performance of gas sensors. In this work, a series of nickel-indium layered double hydroxides (NiIn-LDHs) precursors with different Ni/In atonic molar ratios were synthesized successfully via chemical precipitation methods. And a series of NiO-In2O3 P-N heterojunctioned materials were fabricated by calcining these NiIn-LDHs precursors in the air at high-temperature. Following with an annealing step at H2 atmosphere at different temperatures, these heterojunctioned materials can be used as gas sensing materials to detect low concentration toluene gas. The influence of Ni/In atomic molar ratios and annealing temperatures on gas sensing performance were studied. The results showed that when Ni/In atomic molar ratio was 3.0 and annealing temperature was 500℃, the obtained material showed the highest response to 0.005‰ toluene. In addition, the material also showed high selectivity to other interfering gases (such as 0.005‰ ammonia, acetone, triethylamine, sulfur dioxide, and high-humidity water vapor), and it had shown good stability in a 12-day-testing. A series of characterizations such as XPS, UPS, etc. confirmed that the material Ni/NiO-In2O3 which formed after annealing at 500℃ owns Schottky barrier and abundant oxygen vacancies. The synergistic effect of P-N junction, Schottky barrier and abundant oxygen vacancies lead to the best sensing performance. This work can provide ideas for the development of high-performance toluene gas sensors.

Key words: layered double hydroxides, heterojunction, gas sensor, toluene