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

doi:10.1088/1674-1056/ab3af1

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 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 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/Abstract

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:

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)

闫文君, 曾小敏, 刘欢, 郭春伟, 凌敏, 周后盘. Highly reliable and selective ethanol sensor based on α-Fe₂O₃ nanorhombs working in realistic environments[J]. 中国物理B, 2019, 28(10): 106801-106801.

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). Highly reliable and selective ethanol sensor based on α-Fe₂O₃ nanorhombs working in realistic environments[J]. Chin. Phys. B, 2019, 28(10): 106801-106801.

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

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

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