Single-Molecule Detection and Imaging Laboratory, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Nanoscale. 2013 Jul 7;5(13):6074-80. doi: 10.1039/c3nr00695f. Epub 2013 May 29.
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.
我们通过在室温下的水溶液中，使用三角形金纳米晶种子同时还原 Au 和 Pd 离子，合成了具有三面对称盾状结构的 Au@Pd 核壳纳米晶体，其主要由具有扭折的高指数 {541} 面封闭。所得到的盾状 Au@Pd 核壳纳米晶体在乙醇氧化反应中表现出优异的电催化活性，并且具有独特的近场增强特性，表现出高灵敏度的表面增强拉曼散射（SERS）响应。这些优异的性能可以归因于在盾状 Au@Pd 核壳结构中存在尖锐的角和边缘以及富 Pd 的高指数面。我们还研究了形成具有三面对称盾状结构的 Au@Pd 核壳纳米晶体的机制。
