用于表面增强拉曼散射信号三重放大的蚀刻尖峰 Au@Ag 等离子体超结构单层膜,Nanoscale Horizons

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用于表面增强拉曼散射信号三重放大的蚀刻尖峰 Au@Ag 等离子体超结构单层膜
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2022-03-29 , DOI: 10.1039/d2nh00023g
Huiqin Liu _{1,

2} , Junyi Zeng _{2,

3} , Liping Song _{1,

4} , Lingli Zhang ₂ , Zihai Chen ₅ , Jianhua Li ₆ , Zhidong Xiao ₁ , Fengmei Su ₃ , Youju Huang ₂

Affiliation

一般来说，高质量的表面增强拉曼光谱 (SERS) 基板通常需要通过调节纳米粒子 (NP) 的形态、成分和粗糙度在纳米粒子 (NP) 表面产生高度可定制的电磁 (EM) 场。然而，最近的通用方法仅限于单个组件，将这些关键因素集成到一个系统中以实现理论上最大的信号放大仍然具有挑战性。在此，我们设计了一个三重 SERS 信号放大平台，通过将具有丰富尖端纳米结构、可控银纳米壳以及可定制表面粗糙度的尖峰 Au NPs 协调到一个纳米系统中。结果，界面自组装二维基板的理论电磁场可以提高近5个数量级，^-11 M。最后，农药残留、环境污染物以及医学诊断中的多种分析物低至 10^-11 M，并且可以通过所提出的 SERS 纳米平台进行指纹识别。我们的集成三重放大平台不仅提供了一种有效的 SERS 传感策略，而且还可以在一个基于等离子体的 SERS 传感系统中同时实现高灵敏度、稳定性和通用性。

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Etched-spiky Au@Ag plasmonic-superstructure monolayer films for triple amplification of surface-enhanced Raman scattering signals

Generally, a high quality surface-enhanced Raman spectroscopy (SERS) substrate often requires a highly-tailorable electromagnetic (EM) field generated at nanoparticle (NP) surfaces by the regulation of the morphologies, components and roughness of NPs. However, most recent universal approaches are restricted to single components, and integrating these key factors into one system to achieve the theoretically maximum signal amplification is still challenging. Herein, we design a triple SERS signal amplification platform by the coordination of spiky Au NPs with rich-tip nanostructures, controllable silver nanoshell, as well as tailorable surface roughness into one nano-system. As a result, the theoretical electromagnetic field of the interfacial self-assembled 2D substrate can be improved by nearly 5 orders of magnitude, and the ideal tracing capability for the model SERS molecule can be achieved at levels of 5 × 10⁻¹¹ M. Finally, diverse analytes in pesticide residues, environmental pollutants as well as medically diagnose down to 10⁻¹¹ M and can be fingerprinted by the proposed SERS nano-platform. Our integrated triple amplification platform not only provides an effective SERS sensing strategy, but also makes it possible to simultaneously achieve high sensitivity, stability as well as universality into one plasmonic-based SERS sensing system.

更新日期：2022-03-29

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