材料科学
罗丹明6G
拉曼散射
纳米环
溅射
双金属
表面等离子共振
基质(水族馆)
溅射沉积
拉曼光谱
纳米颗粒
罗丹明B
纳米技术
薄膜
光学
化学
光催化
复合材料
荧光
催化作用
地质学
物理
生物化学
海洋学
作者
Yongjun Zhang,Cong Wang,Jinpeng Wang,Hua Zhong,Jia Li,Ling Yang,Xiaoyu Zhao,Yaxin Wang,Jing Yang
标识
DOI:10.1016/j.saa.2015.07.093
摘要
We fabricated Au:Ag nanocap arrays by co-sputtering Au and Ag onto two-dimensional polystyrene (PS) colloidal sphere templates in a magnetron sputtering system for the surface-enhanced Raman scattering (SERS) substrate. In contrast to the bilayer Au/Ag, the co-sputtering Au:Ag bimetal array formed the protrusion network of Ag and Au nanoparticles, which contributed to Raman enhancement in the waxberry-like structure. The metal protrusions formed waxberry-like shell in which the PS beads were encapsulated. At the same time, the Au:Ag bimetal arrays exhibit 4-fold more enhancement in the SERS signal intensity of Rhodamine 6G at the 1649 cm−1 than Au/Ag bilayer array, which is ascribed to the plasmon coupling between the nanoparticles of Au and Ag on the sample. When the PS colloidal particle templates were etched by O2-plasma before sputtering process, the nanogaps affected the surface plasmon resonance (SPR), and the optimal gaps between adjacent Au:Ag nanocaps generated even stronger SERS enhancements. This SERS substrate of Au:Ag showed high sensitivity and reproducibility. The EF of Au:Ag nanocap array substrate onto which Rhodamine 6G (R6G) were adsorbed was evaluated as 6.72 × 1010.
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