Localized Surface Plasmon Resonance of Silver Nanotriangles Synthesized by a Versatile Solution Reaction.
Localized Surface Plasmon Resonance of Silver Nanotriangles Synthesized by a Versatile Solution Reaction.
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通过多功能溶液反应合成的银纳米三角形的局域表面等离子体共振
DOI：
10.1186/s11671-015-1058-1
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发表时间：
2015-12
影响因子：
--
通讯作者：
Wei J
中科院分区：
文献类型：
--
作者：
Wu C;Zhou X;Wei J
银纳米粒子的表面等离子体共振(SPR)可以通过其形状和大小在可见光和近红外区域进行调谐。考虑到表面等离子体共聚焦的应用，需要一种简单、可控的方法来制备形状和尺寸都确定的纳米银。本工作在室温下，在银籽和聚乙烯吡咯烷酮(PVP)的存在下，用抗坏血酸还原Ag+离子，合成了三角形银纳米板。晶种(作为成核点)和PVP(作为封顶剂)在决定银纳米三角形的边长方面起着重要作用。银纳米三角形的表面等离子体共振谱显示出三个明显的谱带，分别对应于面内偶极、四极和面外四极等离子体共振，理论计算表明，随着银纳米三角形边长的减小，表面等离子体共振峰向更短的波长移动。本文的在线版本(doi：10.1186/s11671-0151058-1)包含补充材料，授权用户可以使用。
The surface plasmon resonance (SPR) of silver nanoparticles can be tuned throughout the visible and near-infrared region by their shape and size. Considering SPR applications, an easy and controllable method for preparing the silver nanocrystals with defined shape and size, is necessary. In this work, the triangular silver nanoplates were synthesized by reducing Ag+ ions with ascorbic acid in the presence of silver seeds and poly(vinylpyrrolidone) (PVP) at room temperature. Both the seeds (as the nucleation sites) and PVP (as the capping reagent) played an important role in determining the edge length of the silver nanotriangles. The SPR of silver nanotriangles showed three distinct bands corresponding to the in-plane dipole, quadrupole, and out-plane quadrupole plasmon resonance, and the SPR shifted to shorter wavelengths with the decreased edge length of the silver nanotriangles as the theoretical calculation. The online version of this article (doi:10.1186/s11671-015-1058-1) contains supplementary material, which is available to authorized users.