期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 855, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157430
关键词
Zinc oxide; Zinc sulfide; Heterostructures; Porous structure; Nanoparticles; Gas-sensing
资金
- National Natural Science Foundation of China [U1933109]
- Fundamental Research Funds for the Central Universities [3122018L011]
A hollow porous ZnO@ZnS core-shell structure was successfully synthesized hydrothermally, showing high gas-sensing performance with high selectivity, quick response-recovery, and stability to ethanol. The gas-sensing enhancement can be attributed to the Schottky barrier at the interface and the special hollow porous structure of ZnO@ZnS.
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. (C) 2020 Elsevier B.V. All rights reserved.
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