Laboratory for Nanomaterials, National Center for Nanoscience and Technology, Beijing 100190, China.
Langmuir. 2012 Jun 19;28(24):8959-64. doi: 10.1021/la204684u. Epub 2012 Feb 22.
We have synthesized Au@Ag core-shell nanocubes containing Au cores with varying shapes and sizes through modified seed-mediated methods. Bromide ions are found to be crucial in the epitaxial growth of Ag atoms onto Au cores and in the formation of the shell's cubic shape. The Au@Ag core-shell nanocubes exhibit very abundant and distinct localized surface plasmon resonance (LSPR) properties, which are core-shape and size-dependent. With the help of theoretical calculation, the physical origin and the resonance mode profile of each LSPR peak are identified and studied. The core-shell nanocrystals with varying shaped cores offer a new rich category for LSPR control through the plasmonic coupling effect between core and shell materials.
我们通过改进的种子介导方法合成了含有不同形状和尺寸金核的 Au@Ag 核壳纳米立方。溴化物离子被发现对于 Ag 原子在 Au 核上的外延生长和壳层立方形状的形成至关重要。Au@Ag 核壳纳米立方表现出非常丰富和独特的局域表面等离子体共振（LSPR）性质，这些性质与核的形状和尺寸有关。借助理论计算，确定并研究了每个 LSPR 峰的物理起源和共振模式轮廓。具有不同形状核的核壳纳米晶体通过核壳材料之间的等离子体耦合效应为 LSPR 控制提供了一个新的丰富类别。
