Opt Express. 2022 Apr 11;30(8):13226-13237. doi: 10.1364/OE.454893.
In this paper, we designed a surface-enhanced Raman scattering (SERS) substrate for graphene/Ag nanoparticles (Ag NPs) bonded multilayer film (MLF) using the hybrid nanostructures composed of graphene and plasmonic metal components with significant plasmonic electrical effects and unique optical characteristics. This paper achieved the advantages of efficient utilization of electromagnetic field and reduction of fluorescence background based on the electromagnetic enhancement activity of Ag NPs and unique physical/chemical properties of graphene with zero gap structures. Au/AlO was stacked periodically to construct MLF. As indicated by the electric field intensity at the Au/AlO interface of the respective layer, bulk plasmon polariton (BPP) in the MLF was excited and coupled with localized surface plasmon (LSP) in the Ag NPs, which enhanced the electromagnetic field on the top-layer of SERS substrate. To measure the performance of the SERS substrate, rhodamine 6G (R6G) and malachite green (MG) were used as the probe molecules, with the detection limits of 10 M and 10 M, respectively. The SERS substrate had high sensitivity and uniformity, which indicated that it has a broad application prospect in the field of molecular detection.
本文设计了一种基于石墨烯/银纳米粒子（Ag NPs）结合多层膜（MLF）的表面增强拉曼散射（SERS）基底，该基底使用由石墨烯和等离子体金属组件组成的混合纳米结构，具有显著的等离子体电学效应和独特的光学特性。本文基于 Ag NPs 的电磁场增强活性和具有零间隙结构的石墨烯的独特物理/化学性质，实现了有效利用电磁场和降低荧光背景的优势。Au/AlO 周期性地堆叠以构建 MLF。如各层的 Au/AlO 界面处的电场强度所示，MLF 中的体等离子体激元（BPP）被激发并与 Ag NPs 中的局域表面等离子体（LSP）耦合，从而增强了 SERS 基底顶层的电磁场。为了测量 SERS 基底的性能，使用了罗丹明 6G（R6G）和孔雀石绿（MG）作为探针分子，检测限分别为 10 M 和 10 M。该 SERS 基底具有高灵敏度和均匀性，表明其在分子检测领域具有广阔的应用前景。
