Ultrathin Diamond-like Carbon Film Coated Silver Nanoparticles-Based Substrates for Surface-Enhanced Raman Spectroscopy
Ultrathin Diamond-like Carbon Film Coated Silver Nanoparticles-Based Substrates for Surface-Enhanced Raman Spectroscopy
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用于表面增强拉曼光谱的超薄类金刚石碳膜涂覆的银纳米颗粒基底
DOI：
10.1021/nn100053s
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发表时间：
2010-05-01
期刊：
影响因子：
17.1
通讯作者：
Wang, Zhenlin
中科院分区：
文献类型：
--
作者：
Liu, Fanxin;Cao, Zhishen;Wang, Zhenlin
我们已经证明，通过在可见光区涂覆一层薄薄的四面体无定形碳(ta-C)介质层，基于银纳米颗粒的衬底变得非常适合于表面增强拉曼光谱(SERS)。我们的测量表明，10埃或更厚的ta-C层可以有效地保护空气中的无氧银，并防止银在水溶液中电离。此外，镀有10埃的Ta-C薄膜的银纳米粒子衬底表现出比未涂层衬底更高的拉曼信号增强。我们的数值模拟进一步支持了这些观测结果。我们认为，利用Ta-C涂层的银基表面增强拉曼光谱衬底可以很容易地实现分析分析中的生物分子检测，特别是在可见光范围内。涂层衬底还具有更高的机械稳定性、化学惰性和工艺顺应性，可能有助于通过表面等离子体增强TiO2光催化和太阳能电池的效率。
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.