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

doi:10.1088/1674-1056/ab3af1

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.

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

Received: 13 June 2019
Revised: 29 July 2019
Accepted manuscript online:

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

Fund:

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

Corresponding Authors: Wenjun Yan, Houpan Zhou
E-mail: yanwenjun@hdu.edu.cn;houpan@hdu.edu.cn

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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 2019 Chin. Phys. B 28 106801

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

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