中国物理B ›› 2019, Vol. 28 ›› Issue (10): 106801-106801.doi: 10.1088/1674-1056/ab3af1

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Highly reliable and selective ethanol sensor based on α-Fe2O3 nanorhombs working in realistic environments

Wenjun Yan(闫文君), Xiaomin Zeng(曾小敏), Huan Liu(刘欢), Chunwei Guo(郭春伟), Min Ling(凌敏), Houpan Zhou(周后盘)   

  1. 1 Smart City Research Center, School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China;
    2 Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2019-06-13 修回日期:2019-07-29 出版日期:2019-10-05 发布日期:2019-10-05
  • 通讯作者: Wenjun Yan, Houpan Zhou E-mail:yanwenjun@hdu.edu.cn;houpan@hdu.edu.cn
  • 基金资助:

    Project supported by the Research Foundation of Hangzhou Dianzi University, China and 2011 Zhejiang Regional Collaborative Innovation Center for Smart City, China.

Highly reliable and selective ethanol sensor based on α-Fe2O3 nanorhombs working in realistic environments

Wenjun Yan(闫文君)1, Xiaomin Zeng(曾小敏)2, Huan Liu(刘欢)1, Chunwei Guo(郭春伟)1, Min Ling(凌敏)2, Houpan Zhou(周后盘)1   

  1. 1 Smart City Research Center, School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China;
    2 Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2019-06-13 Revised:2019-07-29 Online:2019-10-05 Published:2019-10-05
  • Contact: Wenjun Yan, Houpan Zhou E-mail:yanwenjun@hdu.edu.cn;houpan@hdu.edu.cn
  • Supported by:

    Project supported by the Research Foundation of Hangzhou Dianzi University, China and 2011 Zhejiang Regional Collaborative Innovation Center for Smart City, China.

摘要:

A highly reliable and selective ethanol gas sensor working in realistic environments based on alpha-Fe2O3 (α-Fe2O3) nanorhombs is developed. The sensor is fabricated by integrating α-Fe2O3 nanorhombs onto a low power microheater based on micro-electro-mechanical systems (MEMS) technology. The α-Fe2O3 nanorhombs, prepared via a solvothermal method, is characterized by transmission electron microscopy (TEM), Raman spectroscopy, x-ray diffraction (XRD), and x-ray photoelectron spectroscopy (XPS). The sensing performances of the α-Fe2O3 sensor to various toxic gases are investigated. The optimum sensing temperature is found to be about 280 ℃. The sensor shows excellent selectivity to ethanol. For various ethanol concentrations (1 ppm-20 ppm), the response and recovery times are around 3 s and 15 s at the working temperature of 280 ℃, respectively. Specifically, the α-Fe2O3 sensor exhibits a response shift less than 6% to ethanol at 280 ℃ when the relative humidity (RH) increases from 30% to 70%. The good tolerance to humidity variation makes the sensor suitable for reliable applications in Internet of Things (IoT) in realistic environments. In addition, the sensor shows great long-term repeatability and stability towards ethanol. A possible gas sensing mechanism is proposed.

关键词: α-Fe2O3, ethanol sensor, chemi-resistive, in realistic environment, micro-electro-mechanical systems (MEMS)

Abstract:

A highly reliable and selective ethanol gas sensor working in realistic environments based on alpha-Fe2O3 (α-Fe2O3) nanorhombs is developed. The sensor is fabricated by integrating α-Fe2O3 nanorhombs onto a low power microheater based on micro-electro-mechanical systems (MEMS) technology. The α-Fe2O3 nanorhombs, prepared via a solvothermal method, is characterized by transmission electron microscopy (TEM), Raman spectroscopy, x-ray diffraction (XRD), and x-ray photoelectron spectroscopy (XPS). The sensing performances of the α-Fe2O3 sensor to various toxic gases are investigated. The optimum sensing temperature is found to be about 280 ℃. The sensor shows excellent selectivity to ethanol. For various ethanol concentrations (1 ppm-20 ppm), the response and recovery times are around 3 s and 15 s at the working temperature of 280 ℃, respectively. Specifically, the α-Fe2O3 sensor exhibits a response shift less than 6% to ethanol at 280 ℃ when the relative humidity (RH) increases from 30% to 70%. The good tolerance to humidity variation makes the sensor suitable for reliable applications in Internet of Things (IoT) in realistic environments. In addition, the sensor shows great long-term repeatability and stability towards ethanol. A possible gas sensing mechanism is proposed.

Key words: α-Fe2O3, ethanol sensor, chemi-resistive, in realistic environment, micro-electro-mechanical systems (MEMS)

中图分类号:  (Semiconductors)

  • 68.55.ag
81.07.Bc (Nanocrystalline materials) 68.47.Fg (Semiconductor surfaces) 68.43.-h (Chemisorption/physisorption: adsorbates on surfaces)