Journal
PLASMONICS
Volume 10, Issue 6, Pages 1373-1380Publisher
SPRINGER
DOI: 10.1007/s11468-015-9933-2
Keywords
ZnO nanorods; Au nanoparticles; Surface plasmon resonance; Photoluminescence; Photodegradation
Funding
- National Natural Science Foundation of China [10804101, 60908023, 11375159]
- Science and Technology Development Foundation of Chinese Academy of Engineering Physics [2010B0401055]
- Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, CAEP [12zxjk07]
- Research Fund for the Doctoral Program of Southwest University of Science and Technology [14zx7144]
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We reported a simple hydrothermal method to fabricate Au nanoparticles-decorated ZnO nanorods (ZnO-NRs) using aligned ZnO-NRs arrays as a template. Via changing the concentration of HAuCl4 aqueous solution, the size and density of Au nanoparticles (NPs) on the surface of ZnO-NRs could be readily tuned. The photoluminescence of Au-NPs decorated ZnO-NRs were investigated, in order to optimize the configuration of the Au-NPs decorated ZnO-NRs system realizing the maximum band emission. Due to a synergistic effect of the adjacent Au NPs and ZnO-NRs and efficiently coupled localized surface plasmon resonance (SPR) excitation, an optimized sample employing Au NPs with 15-nm size showed best catalytic efficiency. We have proposed a mechanism that is the electron transfer from surface-plasmon-stimulated \Au NPs to the conduction band of ZnO-NRs. These results demonstrate that Au NPs can significantly enhance the charge separation by extracting electrons from the photoexcited ZnO and consequently improve the photocatalytic activity of the composites.
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