Abstract
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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Acknowledgments
The work is supported by the National Natural Science Foundation of China (No. 10804101; 60908023; 11375159), Science and Technology Development Foundation of Chinese Academy of Engineering Physics (No. 2010B0401055), Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, CAEP (No. 12zxjk07), the Research Fund for the Doctoral Program of Southwest University of Science and Technology (No. 14zx7144).
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Yi, Z., Chen, J., Luo, J. et al. Surface-Plasmon-Enhanced Band Emission and Enhanced Photocatalytic Activity of Au Nanoparticles-Decorated ZnO Nanorods. Plasmonics 10, 1373–1380 (2015). https://doi.org/10.1007/s11468-015-9933-2
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DOI: https://doi.org/10.1007/s11468-015-9933-2