Author Affiliations
Abstract
1 Chemistry Department, Université de Montréal, Montreal H3C 3J7, Canada
2 Division of Research and development, Lovely Professional University, Punjab 144411, India
3 Nanophotonics-Nanoeletronicss, Institut National de la Recherche Scientifique INRS-EMT, Varennes J3X 1S2, Canada
We suggested a plasmonic platform based on a cubic pattern of gold spheres for surface enhanced Raman spectroscopy (SERS). In the case of linear polarization along the symmetry axes, the SERS enhancement per area is identical to hexagonally patterned surfaces. The validity of this model was tested using the simulation package of COMSOL Multiphysics- Modeling Software. We found an improved sensitivity in the near infrared and visible region of the electromagnetic spectrum. This method considered tolerance towards stacking faults and suggested a plasmonic platform for ultra-sensing applications. The design can be extended towards the molecular detection if the proposed plasmonic platform is used with SERS.
Plasmonic platform SERS enhancement sensitivity finite element method Photonic Sensors
2020, 10(3): 204
1 中国科学院厦门城市环境研究所, 厦门 361021
2 厦门大学化学化工学院固体表面物理化学国家重点实验室化学系, 厦门 361005
腺嘌呤/金属体系中电荷转移(CT)增强机理的深入认识对理解单分子SERS和TERS中的巨大增强效应意义重大。受激发光波长的限制, 关于CT是否存在的实验证据目前还未见报道。本文在获得钯上UV-SERS的基础上, 借助紫外光激发的优势, 研究了腺嘌呤吸附在钯包金体系中的电荷转移增强机理。通过分析三个激发光波长下(325 nm、514.5 nm 和632.8 nm)的电位SERS 谱, 获得了峰值电位与激发光能量hv之间斜率为正的线性关系, 从实验上首次证实了腺嘌呤吸附在钯上的电荷转移增强机理, 电荷转移方向是从金属到分子。这对深入认识SM-SERS 或TERS 中腺嘌呤在金和银上的巨大增强效应起到了一定的指导作用。
电荷转移 SERS增强机理 腺嘌呤 钯 charge transfer SERS enhancement mechanism adenine Pd
