Double Ag Nanowires on a Bilayer MoS 2 Flake for Surface-Enhanced Raman Scattering
Double Ag Nanowires on a Bilayer MoS 2 Flake for Surface-Enhanced Raman Scattering
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双层 MoS2 薄片上的双银纳米线用于表面增强拉曼散射
DOI：
10.1021/acs.jpcc.0c08184
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wu, Judy Z.
中科院分区：
文献类型：
--
作者：
Yu, Lulu;Lu, Liu;Zeng, Linghui;Yan, Xiaohong;Ren, Xifeng;Wu, Judy Z.
利用双层三角形MoS 2薄片上的银纳米线（AgNWs）杂化纳米结构，在偏振光激发下，研究了罗丹明6 G（R6 G）的表面增强拉曼光谱（Sers）.增强的R6 G拉曼签名上实现的混合AgNWs-MoS 2 SERS基板相比，只有AgNWs的。此外，研究还发现偏振不仅影响R6 G和MoS 2在两Sers基底上的拉曼强度，而且还影响R6 G在AgNWs-MoS 2混合基底上的拉曼增强因子.具体而言，这种增强被认为是最大的（最低）时，极化是垂直（平行）对齐的AgNW的轴向方向。此外，理论模拟表明，MoS 2增强AgNWs-MoS 2 SERS基底的主要原因是增强了AgNWs和MoS 2界面处热点的倏逝电场.
Surface-enhanced Raman spectroscopy (SERS) of rhodamine 6G (R6G) was investigated using a hybrid nanostructure of double-aligned Ag nanowires (AgNWs) on a bilayer triangular MoS2flake under excitation of polarized light. Enhanced R6G Raman signatures were achieved on the hybrid AgNWs–MoS2SERS substrates as compared to the AgNWs-only ones. Moreover, the polarization has been found to affect not only the Raman intensities of R6G and MoS2on both SERS substrates but also the R6G Raman enhancement factor on the hybrid AgNWs–MoS2SERS substrate. Specifically, this enhancement was found to be the largest (lowest) when the polarization is perpendicular (parallel) to the axial direction of the aligned AgNWs. In addition, a theoretical simulation has revealed that the SERS enhancement by the MoS2in the hybrid AgNWs–MoS2SERS substrates is primarily attributed to the enhanced evanescent electric field of the hot spot at the interface between AgNWs and MoS2.