Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance.

Min Hu, Carolina Novo, Alison Funston, Haining Wang, Hristina Staleva, Shengli Zou, Paul Mulvaney, Younan Xia, Gregory V Hartland
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Abstract

This article provides a review of our recent Rayleigh scattering measurements on single metal nanoparticles. Two different systems will be discussed in detail: gold nanorods with lengths between 30 and 80 nm, and widths between 8 and 30 nm; and hollow gold-silver nanocubes (termed nanoboxes or nanocages depending on their exact morphology) with edge lengths between 100 and 160 nm, and wall thicknesses of the order of 10 nm. The goal of this work is to understand how the linewidth of the localized surface plasmon resonance depends on the size, shape, and environment of the nanoparticles. Specifically, the relative contributions from bulk dephasing, electron-surface scattering, and radiation damping (energy loss via coupling to the radiation field) have been determined by examining particles with different dimensions. This separation is possible because the magnitude of the radiation damping effect is proportional to the particle volume, whereas, the electron-surface scattering contribution is inversely proportional to the dimensions. For the nanorods, radiation damping is the dominant effect for thick rods (widths greater than 20 nm), while electron-surface scattering is dominant for thin rods (widths less than 10 nm). Rods with widths in between these limits have narrow resonances-approaching the value determined by the bulk contribution. For nanoboxes and nanocages, both radiation damping and electron-surface scattering are significant at all sizes. This is because these materials have thin walls, but large edge lengths and, therefore, relatively large volumes. The effect of the environment on the localized surface plasmon resonance has also been studied for nanoboxes. Increasing the dielectric constant of the surroundings causes a red-shift and an increase in the linewidth of the plasmon band. The increase in linewidth is attributed to enhanced radiation damping.

单个金属纳米粒子的暗场显微镜研究:了解影响局部表面等离子体共振线宽的因素。
本文回顾了我们最近对单个金属纳米粒子进行的瑞利散射测量。文章将详细讨论两种不同的系统:长度在 30 纳米到 80 纳米之间、宽度在 8 纳米到 30 纳米之间的金纳米棒;以及边缘长度在 100 纳米到 160 纳米之间、壁厚在 10 纳米左右的空心金银纳米立方体(根据其具体形态被称为纳米盒或纳米笼)。这项工作的目标是了解局部表面等离子体共振的线宽如何取决于纳米粒子的尺寸、形状和环境。具体来说,我们通过研究不同尺寸的粒子,确定了来自块体去相、电子-表面散射和辐射阻尼(通过与辐射场耦合的能量损失)的相对贡献。这种分离是可能的,因为辐射阻尼效应的大小与粒子体积成正比,而电子表面散射的贡献则与尺寸成反比。对于纳米棒来说,辐射阻尼是粗棒(宽度大于 20 纳米)的主要效应,而电子表面散射则是细棒(宽度小于 10 纳米)的主要效应。宽度介于这两个极限之间的棒具有窄共振--接近由体贡献决定的值。对于纳米盒和纳米笼,辐射阻尼和电子表面散射在所有尺寸上都很重要。这是因为这些材料的壁较薄,但边缘长度较大,因此体积相对较大。对于纳米盒,我们还研究了环境对局部表面等离子体共振的影响。提高周围环境的介电常数会导致质子带的红移和线宽增加。线宽的增加归因于辐射阻尼的增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Materials Chemistry
Journal of Materials Chemistry 工程技术-材料科学:综合
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1.5 months
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