Synthesis of hexagonal-like ZnO/Ag composite with excellent photocatalytic activity

Hexagonal-like zinc oxide (ZnO)/silver (Ag) composite was successfully synthesised by a flux/solvothermal route, and Ag nanoparticles are loaded on ZnO. Compared with pure ZnO, the attachment of Ag on ZnO can significantly increase visible-light absorption and reduce photoluminescence emission inten...

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Bibliographic Details
Published in:Micro & nano letters 2019-05, Vol.14 (6), p.656-660
Main Authors: Wang, Ming Hua, Cai, Hong Lan, Guo, Zhen Liang, Qiao, Qing An, Ren, Shu Hua, Zhu, Dong Dong, Xue, Zhong Xin
Format: Article
Language:English
Subjects:
Catalytic activity
crystal growth from solution
dyes
Electromagnetic absorption
Emission analysis
Emissions control
flux‐solvothermal route
II‐VI semiconductors
Light irradiation
Luminous intensity
nanocomposites
nanofabrication
Nanoparticles
Photocatalysis
photocatalysts
photocatalytic activity
Photodegradation
Photoluminescence
photoluminescence emission intensity
Rhodamine
rhodamine B solution
Schottky barriers
semiconductor growth
Silver
silver nanoparticles
surface plasmon resonance
Titanium dioxide
Ultraviolet radiation
ultraviolet spectra
UV irradiation
visible light irradiation
visible spectra
visible‐light absorption
wide band gap semiconductors
zinc compounds
Zinc oxide
Zinc oxides
zinc oxide‐silver composite
ZnO‐Ag
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Summary:Hexagonal-like zinc oxide (ZnO)/silver (Ag) composite was successfully synthesised by a flux/solvothermal route, and Ag nanoparticles are loaded on ZnO. Compared with pure ZnO, the attachment of Ag on ZnO can significantly increase visible-light absorption and reduce photoluminescence emission intensity. The photocatalytic performance of ZnO/Ag composite was evaluated by the degradation of Rhodamine B solution under ultraviolet (UV) light and visible light irradiation. The degradation rate of ZnO/Ag composite is obviously improved compared with pure ZnO and the commercial TiO2 (P25) and is more than 2.5 and 2.9 times faster than that of pure ZnO under the UV and visible light irradiation, respectively. The enhanced photocatalytic activity of ZnO/Ag composite under UV irradiation was ascribed to the formation of Schottky barriers between Ag particles and ZnO. However, the superior photocatalytic activity under visible light irradiation could be attributed to the surface plasmon resonance of Ag particles.
ISSN:1750-0443
1750-0443
DOI:10.1049/mnl.2018.5308