Gold nanoplasmonic particles in tunable porous silicon 3D scaffolds for ultra-low concentration detection by SERS,Nanoscale Horizons

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Gold nanoplasmonic particles in tunable porous silicon 3D scaffolds for ultra-low concentration detection by SERS
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2021-07-16 , DOI: 10.1039/d1nh00228g
Rihan Wu ₁ , Qihao Jin ₂ , Catherine Storey ₁ , Jack Collins ₁ , Guillaume Gomard ₃ , Uli Lemmer ₂ , Leigh Canham ₁ , Rainer Kling ₂ , Andrey Kaplan ₁

Affiliation

A composite material of plasmonic nanoparticles embedded in a scaffold of nano-porous silicon offers unmatched capabilities for use as a SERS substrate. The marriage of these components presents an exclusive combination of tightly focused amplification of Localised Surface Plasmon (LSP) fields inside the material with an extremely high surface-to-volume ratio. This provides favourable conditions for a single molecule or extremely low concentration detection by SERS. In this work the advantage of the composite is demonstrated by SERS detection of Methylene Blue at a concentration as low as a few picomolars. We systematically investigate the plasmonic properties of the material by imaging its morphology, establishing its composition and the effect on the LSP resonance optical spectra.

中文翻译：

用于 SERS 超低浓度检测的可调多孔硅 3D 支架中的金纳米等离子体粒子

嵌入纳米多孔硅支架中的等离子体纳米粒子复合材料提供了无与伦比的功能，可用作 SERS 基底。这些组件的结合呈现了材料内部局部表面等离子体 (LSP) 场的紧密聚焦放大的独特组合，具有极高的表面体积比。这为单分子或极低浓度的 SERS 检测提供了有利条件。在这项工作中，复合材料的优势通过 SERS 检测浓度低至几皮摩尔的亚甲蓝来证明。我们通过对其形态进行成像、确定其组成和对 LSP 共振光谱的影响来系统地研究材料的等离子体特性。

更新日期：2021-08-07

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