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Nanogranular Au films deposited on carbon covered Si substrates for enhanced optical reflectivity and Raman scattering

机译:沉积在碳覆盖的硅基板上的纳米颗粒金膜,用于增强光反射率和拉曼散射

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Electroless deposition of gold has been carried out on Si(100) surfaces precoated with laser ablated carbon layers of different thicknesses, and the resulting substrates have been characterized by a host of techniques. We first established the porous nature of the amorphous carbon layer by Raman and profilometric measurements. The Au uptake from the plating solution was optimal at a carbon layer thickness of 90 nm, where we observed nanogranules of approx 60-70 nm, well separated from each other in the carbon matrix (mean interparticle spacing approx 7 nm). We believe that the observed nanostructure is a result of Au~(3+) electroless reduction on the Si surface through porous channels present in the amorphous carbon matrix. Importantly, this nanostructured substrate exhibited high reflectivity in the near IR region besides being effective as a substrate for surface enhanced Raman scattering (SERS) measurements with enhancement factors up to 10~7.
机译:在预涂有不同厚度的激光烧蚀碳层的Si(100)表面上进行了金的化学沉积,并且通过多种技术对所得基材进行了表征。我们首先通过拉曼光谱和轮廓测量法确定了无定形碳层的多孔性。镀液中的Au吸收在90 nm的碳层厚度下是最佳的,我们观察到约60-70 nm的纳米颗粒在碳基质中相互分离(平均粒子间间距约为7 nm)。我们认为,观察到的纳米结构是通过非晶碳基质中存在的多孔通道在Si表面进行Au〜(3+)化学还原的结果。重要的是,这种纳米结构基板除了可以有效用作表面增强拉曼散射(SERS)测量的基板外,还具有高达10〜7的增强因子,在近红外区域显示出高反射率。

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