Journal
NANOSCALE
Volume 5, Issue 13, Pages 6074-6080Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr00695f
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Funding
- National Basic Research Program 973 [2011CB933600, 2010CB732600]
- National Natural Science Foundation of China [21075129]
- Chinese Academy of Science
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We synthesize the three-fold symmetric shield-like Au@Pd core-shell nanocrystals, enclosed predominantly by high-index {541} facets with kinks, through the simultaneous reduction of Au and Pd ions in the presence of triangular Au nanocrystal seeds in aqueous solution at room-temperature. The obtained shield-like Au@Pd core-shell nanocrystals exhibit superior electrocatalytic activity for the oxidation of ethanol and unique near-field enhancement property with a highly sensitive surface-enhanced Raman scattering (SERS) response. These excellent properties can be ascribed to the presence of sharp corners and edges as well as high-index faceted Pd-rich shell in the shield-like Au@Pd core-shell structure. We also investigate the mechanism for the formation of three-fold symmetric shield-like Au@Pd core-shell nanocrystals.
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