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Monolayer graphene on nanostructured Ag for enhancement of surface-enhanced Raman scattering stable platform

机译：纳米结构Ag上的单层石墨烯，用于增强表面增强拉曼散射稳定平台

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摘要

We have reported that the Ag nanostructure-based substrate is particularly suitable for surface-enhanced Raman scattering when it is coated with monolayer graphene, an optically transparent and chemistry-inertness material in the visible range. Ag bowtie nanoantenna arrays and Ag nanogrids were fabricated using plasma-assisted nanosphere lithography. Our measurements show that atmospheric sulfur containing compounds are powerless to break in the monolayer graphene to vulcanize the surfaces of the Ag bowtie nanoantenna arrays and Ag nanogrids by various means, including scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). Furthermore, the Ag nanostructure substrate coated with the monolayer graphene film shows a larger enhancement of Raman activity and the electromagnetic field than the uncoated substrate. Compared with those of bare Ag nanostructures, the averaged EFs of graphene-film-coated Ag nanostructures were estimated to be about 21 and 5 for Ag bowtie nanoantenna arrays and nanogrids after one month later in air, respectively. These observations are further supported by theoretical calculations.
机译：我们已经报道，当用单层石墨烯（一种可见光范围内的光学透明和化学惰性材料）涂覆时，基于银纳米结构的基底特别适合于表面增强拉曼散射。 Ag领结纳米天线阵列和Ag纳米网格使用等离子辅助纳米球光刻技术制造。我们的测量结果表明，大气中的含硫化合物无法通过单层石墨烯断裂，从而无法通过各种方法（包括扫描电子显微镜（SEM）和X射线光电子能谱（XPS））硫化Ag领结纳米天线阵列和Ag纳米格栅的表面。此外，涂覆有单层石墨烯膜的Ag纳米结构衬底比未涂覆的衬底表现出更大的拉曼活性和电磁场增强。与裸银纳米结构相比，在大气中放置一个月后，领结纳米天线阵列和纳米格栅的石墨烯薄膜覆盖的银纳米结构的平均EF分别约为21和5。这些观察结果得到理论计算的进一步支持。

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