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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Surface-Enhanced Raman Spectroscopy Using Lipid Encapsulated Plasmonic Nanoparticles and J-Aggregates To Create Locally Enhanced Electric Fields
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Surface-Enhanced Raman Spectroscopy Using Lipid Encapsulated Plasmonic Nanoparticles and J-Aggregates To Create Locally Enhanced Electric Fields

机译：表面增强拉曼光谱使用脂质包裹的等离子体纳米粒子和J聚集体以创建局部增强的电场

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摘要

Semiconductor—metal composite nanoparticles offer optical properties that are superior to those of pure materials. In this study, we exploit the epsilon near zero (ENZ) phenomenon using silver nanoparticles functionalized with a thiacyanine dye, which formed a distinct J-aggregate on the surface of the particle. These J-aggregates show a distinct nonlinear optical response, and a wavelength matching approach was used to couple the plasmonic particle to the J-aggregate . When the appropriate wavelength is utilized, these particles showed an enhanced surface-enhanced Raman spectroscopy (SERS) signal as a result of the excitonic resonance of the J-aggregate species. The theoretical properties of the particles were simulated using FDTD techniques, and these were experimentally verified by varying the distance between the dye and particle surface. Experimental SERS spectra had excellent agreement with simulations. These composite particles were then encapsulated in a lipid bilayer, forming a multishell structure with properties suitable for biosensing and other detection applications.
机译：半导体—金属复合纳米颗粒的光学性能优于纯材料。在这项研究中，我们利用硫氰酸盐染料功能化的银纳米颗粒利用ε接近零（ENZ）现象，该颗粒在颗粒表面形成了独特的J聚集体。这些J聚集体表现出明显的非线性光学响应，并且使用波长匹配方法将等离子体粒子耦合到J聚集体。当使用适当的波长时，由于J聚集物物种的激子共振，这些颗粒显示出增强的表面增强拉曼光谱（SERS）信号。使用FDTD技术模拟了颗粒的理论性质，并通过改变染料与颗粒表面之间的距离对这些理论性质进行了实验验证。实验性SERS光谱与模拟具有极好的一致性。然后将这些复合颗粒封装在脂质双层中，形成具有适合生物传感和其他检测应用的特性的多壳结构。

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