Fabrication of hollow porous ZnO@ZnS heterostructures via hydrothermal method and enhanced gas-sensing performance for ethanol

Heterostructures with great modulation of electron transfer afford a great opportunity for gas-sensing applications. Herein, a hollow porous ZnO@ZnS core-shell structure with high gas-sensing performance has been successfully hydrothermally synthesized. The phase composition and the morphology of th...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-02, Vol.855, p.157430, Article 157430
Main Authors: Li, Yan, Song, Shuang, Zhang, Lin-Bin, Lian, Xiao-Xue, Shan, Lin-Xi, Zhou, Qing-Jun
Format: Article
Language:English
Subjects:
Core-shell structure
Design optimization
Electron microscopes
Electron transfer
Ethanol
Gas-sensing
Heterostructures
Morphology
Nanoparticles
Phase composition
Porous structure
Recovery time
Selectivity
Zinc oxide
Zinc sulfide
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Summary:Heterostructures with great modulation of electron transfer afford a great opportunity for gas-sensing applications. Herein, a hollow porous ZnO@ZnS core-shell structure with high gas-sensing performance has been successfully hydrothermally synthesized. The phase composition and the morphology of the as-prepared products were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope and energy dispersive X-ray spectroscopy. The results show that the pure ZnO and the ZnO@ZnS appear a mesoporous structure and a hollow porous structure, respectively. Gas-sensing measurements show that the gas-sensing performance of the ZnO@ZnS based sensor is obviously higher than that of the pure ZnO, and it has a high selectivity, quick response-recovery and stability to ethanol. Its response reaches 114.2 to 100 ppm ethanol, and the response and recovery time is 3 s and 8 s to ethanol, respectively. The gas-sensing enhancement of the ZnO@ZnS can be attributed to the Schottky barrier at the interface of the ZnO@ZnS and the special hollow porous structure. The strategy put forward is generally applicable to design efficient ethanol sensors with optimized sensing performances. •A hollow porous ZnO@ZnS Heterostructures have been successfully synthesized.•The ZnO@ZnS sensor shows excellent gas-sensing performance to ethanol.•The gas-sensing mechanism of the hollow porous ZnO@ZnS is discussed in detail.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157430