Wang Zirui, Huo Yanyan, Ning Tingyin, Liu Runcheng, Zha Zhipeng, Shafi Muhammad, Li Can, Li Shuanglu, Xing Kunyu, Zhang Ran, Xu Shicai, Li Zhen, Jiang Shouzhen
Collaborative Innovation Center of Light Manipulations and Applications in Universities of Shandong School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Shandong Key Laboratory of Medical Physics and Image Processing & Shandong Provincial Engineering and Technical Center of Light Manipulations, Jinan 250014, China.
Nanomaterials (Basel). 2021 Feb 26;11(3):587. doi: 10.3390/nano11030587.
Hyperbolic metamaterials (HMMs), supporting surface plasmon polaritons (SPPs), and highly confined bulk plasmon polaritons (BPPs) possess promising potential for application as surface-enhanced Raman scattering (SERS) substrates. In the present study, a composite SERS substrate based on a multilayer HMM and gold-nanoparticle (Au-NP) layer was fabricated. A strong electromagnetic field was generated at the nanogaps of the Au NPs under the coupling between localized surface plasmon resonance (LSPR) and a BPP. Additionally, a simulation of the composite structure was assessed using COMSOL; the results complied with those achieved through experiments: the SERS performance was enhanced, while the enhancing rate was downregulated, with the extension of the HMM periods. Furthermore, this structure exhibited high detection performance. During the experiments, rhodamine 6G (R6G) and malachite green (MG) acted as the probe molecules, and the limits of detection of the SERS substrate reached 10 and 10 M for R6G and MG, respectively. Moreover, the composite structure demonstrated prominent reproducibility and stability. The mentioned promising results reveal that the composite structure could have extensive applications, such as in biosensors and food safety inspection.
支持表面等离激元极化激元（SPP）和高度受限的体等离激元极化激元（BPP）的双曲线超材料（HMM）作为表面增强拉曼散射（SERS）基底具有广阔的应用潜力。在本研究中，制备了一种基于多层HMM和金纳米颗粒（Au-NP）层的复合SERS基底。在局域表面等离激元共振（LSPR）和BPP的耦合作用下，Au NPs的纳米间隙处产生了强电磁场。此外，使用COMSOL对复合结构进行了模拟；结果与实验结果相符：随着HMM周期的延长，SERS性能增强，但增强速率下调。此外，该结构表现出高检测性能。在实验过程中，罗丹明6G（R6G）和孔雀石绿（MG）用作探针分子，SERS基底对R6G和MG的检测限分别达到10和10 M。此外，复合结构表现出显著的重现性和稳定性。上述有前景的结果表明，该复合结构可具有广泛的应用，如用于生物传感器和食品安全检测。
