A P/N type silicon semiconductor loaded with silver nanoparticles used as a SERS substrate to selectively drive the coupling reaction induced by surface plasmons,Nanoscale Advances

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A P/N type silicon semiconductor loaded with silver nanoparticles used as a SERS substrate to selectively drive the coupling reaction induced by surface plasmons
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0na00350f
Yuanchun Zhao ₁ , Qijia Zhang ₁ , Liping Ma ₁ , Peng Song ₂ , Lixin Xia _{1,

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Affiliation

Semiconductor materials are favoured in the field of photocatalysis due to their unique optoelectronic properties. When a semiconductor is excited by external energy, electrons will transition through the band gap, providing electrons or holes for the reaction. This is similar to the chemical enhancement mode of a catalytic reaction initiated by the rough noble metal on the surface excited by plasmon resonance. In this study, different types of semiconductor silicon loaded with silver nanoparticles were used as SERS substrates. SERS detection of p-aminothiophenol (PATP) and p-nitrothiophenol (PNTP) probe molecules was performed using typical surface plasmon-driven coupling reactions, and the mechanism of optical drive charge transfer in semiconductor–metal–molecular systems was investigated. Scanning electron microscopy and plasmon luminescence spectroscopy were used to characterize the silver deposited on the substrate surface. Mapping technology and electrochemistry were used to characterize the photocatalytic reaction of the probe molecules. This study proposed a mechanism for the coupling reaction of “hot electrons” and “hot holes” on the surface of plasmon-driven molecules and provides a method for preparing a stable SERS substrate.

中文翻译：

负载银纳米粒子的AP/N型硅半导体用作SERS基底选择性驱动表面等离激元诱导的耦合反应

半导体材料因其独特的光电特性而在光催化领域受到青睐。当半导体被外部能量激发时，电子将穿过带隙跃迁，为反应提供电子或空穴。这类似于表面粗糙的贵金属在等离子共振激发下引发催化反应的化学增强模式。在这项研究中，不同类型的负载银纳米粒子的半导体硅被用作SERS基底。利用典型的表面等离子体驱动耦合反应对对氨基苯硫酚（PATP）和对硝基苯硫酚（PNTP）探针分子进行SERS检测，并研究了半导体-金属-分子系统中光驱动电荷转移的机制。使用扫描电子显微镜和等离激元发光光谱来表征沉积在基底表面上的银。利用绘图技术和电化学来表征探针分子的光催化反应。该研究提出了等离子体驱动分子表面“热电子”和“热空穴”耦合反应的机理，并为制备稳定的SERS基底提供了方法。

更新日期：2020-08-11

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