Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 829, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154453
Keywords
Large-size Ag; Porous flower-like ZnO; Ethanol; Gas sensor
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Funding
- National Natural Science Foundation of China [51672220, 51902259]
- National Defense Science Foundation [32102060303]
- Fundamental Research Funds for the Central Universities of NPU [3102019GHXM002, 3102019MS0401]
- China Postdoctoral Science Foundation [2018M641017]
- SKLSP Project [2019-TZ-04]
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3D porous flower-like ZnO microstructures loaded by large-size Ag were successfully synthesized via a simple two-stage method. XRD and XPS results proved that the synthesized Ag/ZnO was a pure phase. SEM and TEM results showed that the Ag nanoparticles with large size (about 400 nm) were successfully loaded on the porous flower-like ZnO. The sensitivity of Ag/ZnO was 268 to 200 ppm ethanol at 300 degrees C, which was 6 times higher than that of pure ZnO. In addition, the sensor of Ag/ZnO exhibited a faster response/recovery behavior and a lower detection limit. The enhanced gas sensing performance of Ag/ZnO has been explained from three aspects: the spillover effect of Ag, the formation of metal-semiconductor heterojunction and the role of electronic sensitization. (C) 2020 Elsevier B.V. All rights reserved.
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