Unraveling the Effects of Size, Composition, and Substrate on the Localized Surface Plasmon Resonance Frequencies of Gold and Silver Nanocubes: A Systematic Single-Particle Approach
Unraveling the Effects of Size, Composition, and Substrate on the Localized Surface Plasmon Resonance Frequencies of Gold and Silver Nanocubes: A Systematic Single-Particle Approach
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DOI：
10.1021/jp104366r
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发表时间：
2010-07-29
影响因子：
3.7
通讯作者：
Van Duyne, Richard P.
中科院分区：
文献类型：
--
作者：
Ringe, Emilie;McMahon, Jeffrey M.;Van Duyne, Richard P.
局域表面等离子体共振（LSPR），由光与金属纳米粒子的相互作用产生，是生物传感器，表面增强光谱和光学器件的强大工具。LSPR频率强烈依赖于纳米颗粒的结构、组成和局部介电环境。然而，由于化学合成产物的异质性，这些关系难以或不可能从本体溶液中探测。在这项研究中，系统的单粒子结构性能的测量，再加上统计分析和FDTD计算，进行银和金纳米立方体。确定了LSPR频率对纳米立方体尺寸、组成和衬底介电常数的依赖关系。所获得的结果代表了迄今为止最定量的测量和分析，产生了预测规则和对纳米颗粒与基底之间相互作用的基本见解。
Localized surface plasmon resonances (LSPRs), resulting from the interaction of light with metal nanoparticles, are powerful tools for biological sensors, surface-enhanced spectroscopies, and optical devices. LSPR frequencies are strongly dependent on a nanoparticle's structure, composition, and local dielectric environment. However, these relationships are prohibitively difficult or impossible to probe from bulk solutions due to the heterogeneity of chemically synthesized products. In this study, systematic single-particle structure-property measurements, coupled with a statistical analysis and FDTD calculations, are performed on silver and gold nanocubes. The dependencies of LSPR frequencies on nanocube size, composition, and substrate dielectric constant are determined. The results obtained represent the most quantitative measurements and analysis to date, yielding predictive rules and fundamental insights into the interactions between nanoparticles and substrates.