期刊
ACS NANO
卷 4, 期 5, 页码 2643-2648出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn100053s
关键词
SERS; ultrathin ta-C film; dielectric layer; Ag nanoparticles; oxygen-free
类别
资金
- State Key Program for Basic Research of China
- NSFC [10734010, 50771054, 10804044]
- Jiang-Su planned projects for Postdoctoral Research Funds [09010158]
We have demonstrated that by coating with a thin dielectric layer of tetrahedral amorphous carbon (ta-C), a biocompatible and optical transparent material in the visible range, the Ag nanoparticle-based substrate becomes extremely suitable for surface-enhanced Raman spectroscopy (SERS). Our measurements show that a 10 angstrom or thicker ta-C layer becomes efficient to protect the oxygen-free Ag in air and prevent Ag ionizing in aqueous solutions. Furthermore, the Ag nanopartides substrate coated with a 10 angstrom ta-C film shows a higher enhancement of Raman signals than the uncoated substrate. These observations are further supported by our numerical simulations. We suggest that biomolecule detections in analytic assays could be easily realized using ta-C-coated Ag-based substrate for SERS especially in the visible range. The coated substrate also has higher mechanical stability, chemical inertness, and technological compliance, and may be useful, for example, to enhance TiO2 photocatalysis and solar-cell efficiency by the surface plasmons.
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