title: A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit.
abstract: H2S gas sensor based on α-Fe2O3 nanoparticles was fabricated by post-thermal annealing of Fe3O4 precursor which was synthesized using a facile hydrothermal route. The characteristic techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were adopted to characterize the chemical composition and microstructure of the obtained samples. Gas-sensing performance of the sensor was investigated at different operation temperatures from 100°C to 400°C. Results showed that the sensor exhibited the best sensitivity, reproducibility and long-term stability for detecting H2S gas at an operating temperature of 300°C. The detection limit towards H2S gas was 0.05 ppm, and the response time and recovery time was 30s and 5s, respectively. In addition, sensing mechanism of the sensor towards H2S was discussed.
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China. Electronic address: zhijieli@uestc.edu.cn.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Li
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Huang
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Shouchao
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Weimei
authors.initials: W
authors.lastname: Chen
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Kuang
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Dongyi
authors.initials: D
authors.lastname: Ao
authors.affiliation: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Physics and Electrical Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE1 8ST, England, United Kingdom.
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Fu
keywords: Gas sensor; H2S; Hydrothermal; Nanoparticles; α-Fe2O3