Optical properties of platinum-coated gold nanorods
Optical properties of platinum-coated gold nanorods
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DOI：
10.1021/jp0671502
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发表时间：
2007-05-03
影响因子：
3.7
通讯作者：
Liz-Marzan, Luis M.
中科院分区：
文献类型：
--
作者：
Grzelczak, Marek;Perez-Juste, Jorge;Liz-Marzan, Luis M.
通过对比实验紫外-可见-近红外光谱和边界元法计算，详细分析了不同形貌的Au/Pt纳米棒的光学性质。所研究的形貌指的是两种不同的Pt沉积模式的Au纳米棒，这已通过实验实现的溶液中的Ag+离子的存在或不存在。虽然在没有Ag+，获得完整的overcoating，这些离子的存在下诱导的尖端上的优先生长，最近由我们报道。(1)两种Pt沉积模式的光谱的变化是不同的，这是充分占使用适当的几何模型在BEM计算。Pt尖端的存在下示出，导致红移的纵向等离子体激元带，因为几何效应，虽然伴随着阻尼由于增加的吸收。
The optical properties of Au/Pt nanorods with different morphologies are analyzed in detail through comparison of experimental UV-vis-NIR spectra and calculations based on the boundary element method (BEM). The studied morphologies refer to two different Pt deposition modes on Au nanorods, which have been experimentally realized through the presence or absence of Ag+ ions in solution. While in the absence of Ag+, complete overcoating was obtained, the presence of these ions induced preferential growth on the tips, as recently reported by us.(1) The changes in the optical spectra are different for both Pt deposition modes, and this is fully accounted for using appropriate geometrical models in the BEM calculations. The presence of Pt tips is shown to lead to red-shifts of the longitudinal plasmon band because of geometrical effects, though accompanied by damping due to increased absorption.