等离子体子
材料科学
石墨烯
拉曼光谱
纳米颗粒
拉曼散射
分子
表面等离子体子
表面增强拉曼光谱
纳米技术
量子点
表面等离子共振
光电子学
化学
光学
物理
有机化学
作者
Shusen Lin,Md Ahasan Habib,Shalmali Burse,Rutuja Mandavkar,Mehedi Hasan Joni,Sundar Kunwar,Jihoon Lee
标识
DOI:10.1016/j.jallcom.2023.169952
摘要
Surface-enhanced Raman spectroscopy (SERS) is an attractive vibrational spectroscopic technique that can enable a non-destructive and ultra-sensitive detection down to the single-molecule level. Herein, a novel hybrid SERS platform is developed based on hybrid core-shell (HyCoS) AgPt nanoparticles (NPs) and graphene quantum dots (GQDs) for the enhancement of Raman vibration of 4-mercaptobenzoic acid (4-MBA) and benzenethiol (BT). The unique design of HyCoS AgPt NPs induces strong electromagnetic mechanism (EM) enhancement through the amplification of electromagnetic fields by the excitation of high-density surface plasmons and hot spots. Superior localized surface plasmon resonance (LSPR) is generated by the AgPt core-shell and background Ag NP coupling, which is systematically investigated by the optical properties and FDTD simulations. The background Ag NPs can further increase the coverage of metallic NPs, leading to higher-density hot spots and enhanced SERS response. At the same time, GQDs can provide plentiful accessible edges for the charge transfer to the HOMO and LUMO of 4-MBA and BT based on the chemical mechanism (CM) enhancement. The mixing approach of GQDs and target molecules on the HyCoS AgPt NPs can significantly amplify the Raman signals via the strong adsorption of probe molecules by the π – π interaction. The enhancement factors of proposed SERS platform can reach ∼107 and ∼105 for the 4-MBA and BT respectively.
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