Wu Rihan, Jin Qihao, Storey Catherine, Collins Jack, Gomard Guillaume, Lemmer Uli, Canham Leigh, Kling Rainer, Kaplan Andrey
School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
Light Technology Institute, Karlsruhe Institute of Technology, Engesserstrasse 13, 76131 Karlsruhe, Germany.
Nanoscale Horiz. 2021 Sep 27;6(10):781-790. doi: 10.1039/d1nh00228g.
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.
一种嵌入纳米多孔硅支架中的等离子体纳米颗粒复合材料，作为表面增强拉曼光谱（SERS）基底具有无与伦比的性能。这些组分的结合呈现出一种独特的组合，即材料内部局域表面等离子体（LSP）场的紧密聚焦放大与极高的表面积与体积比相结合。这为通过SERS进行单分子或极低浓度检测提供了有利条件。在这项工作中，通过对低至几皮摩尔浓度的亚甲基蓝进行SERS检测，证明了该复合材料的优势。我们通过对其形态进行成像、确定其组成以及对LSP共振光谱的影响，系统地研究了该材料的等离子体特性。
