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Published in: Journal of Materials Science: Materials in Electronics 13/2019

04-06-2019

A low operating temperature and high performance sensor for H2S detection based on α-Fe2O3/TiO2 heterojunction nanoparticles composite

Authors: Zhiwu Xu, Haixin Liu, Xin Tong, Wenhao Shen, Xiaoquan Chen, Jean-Francis Bloch

Published in: Journal of Materials Science: Materials in Electronics | Issue 13/2019

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Abstract

Firstly, a low operating temperature and high performance sensor for H2S detection based on α-Fe2O3/TiO2 heterojunction nanoparticles (NPs) was developed by a liquid phase reaction with low synthesis temperature. Secondly, the microstructures and chemical compositions of the gas sensing material were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscope, energy dispersive spectrometer and X-ray photoelectron spectra methods. Thirdly, with the 50 mol% α-Fe2O3 doping amount and operating temperature of 120 °C, the gas sensing performances of the developed α-Fe2O3/TiO2 NPs composite sensor to H2S were obtained: the responses of 3.4–15.6 to 1–50 ppm H2S, a linear relationship between the sensor response and the H2S concentration, the acceptable response/recovery time of 25 s and 48 s to 50 ppm H2S, excellent selectivity (10 times higher than those of the other tested gases) to H2S, and good repeatability and stability in 1-month duration. These excellent H2S gas sensing performances were attributed to the effects of n–n heterojunctions of two metal oxides, which were discussed in detail. Finally, the superior performances of the developed α-Fe2O3/TiO2 NPs composite sensor were compared with the other reported H2S sensors, which the low operating temperature of 120 °C was highlighted.

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Literature
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Metadata
Title
A low operating temperature and high performance sensor for H2S detection based on α-Fe2O3/TiO2 heterojunction nanoparticles composite
Authors
Zhiwu Xu
Haixin Liu
Xin Tong
Wenhao Shen
Xiaoquan Chen
Jean-Francis Bloch
Publication date
04-06-2019
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 13/2019
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-019-01634-0

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