A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit

Li, Zhi-Jie, Huang, Yanwu, Zhang, Shouchao, Chen, Weimei, Kuang, Zhong, Ao, Dongyi, Liu, Wei and Fu, Yong Qing (2015) A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit. Journal of Hazardous Materials, 300. pp. 167-174. ISSN 0304-3894

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Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2015.07.003

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 30 s and 5 s, respectively. In addition, sensing mechanism of the sensor towards H2S was discussed.

Item Type: Article
Additional Information: Published online first 3rd July 2015.
Uncontrolled Keywords: α-Fe2O3, nanoparticles, hydrothermal, H2S, gas sensor
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Ay Okpokam
Date Deposited: 21 Jul 2015 09:37
Last Modified: 14 May 2017 00:53
URI: http://nrl.northumbria.ac.uk/id/eprint/23411

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