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首页> 美国卫生研究院文献>Materials >Strong Dependence of Surface Enhanced Raman Scattering on Structure of Graphene Oxide Film
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Strong Dependence of Surface Enhanced Raman Scattering on Structure of Graphene Oxide Film

机译：表面增强拉曼散射对氧化石墨烯薄膜结构的强烈依赖性

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摘要

Graphene and its derivatives have been demonstrated to be good surface-enhanced Raman scattering (SERS) substrates. However, the literature offers some contrasting views on the SERS effect of graphene-based materials. Thus, understanding the mechanism of the SERS enhancement of graphene is essential for exploring its application as a SERS substrate. In this study, graphene oxide (GO) and chemically reduced graphene oxide (CRGO) films with different morphologies and structures were prepared and applied as SERS substrates to detect Raman dye molecules. The observed enhancement factors can be as large as 10~103. The mechanism of SERS enhancement is discussed. It is shown that the SERS effect was independent of the adsorption of dye molecules and the surface morphologies of graphene-based films. Raman shifts are observed and are almost the same on different graphene-based films, indicating the existence of charge transfer between dye molecules and substrates. The Raman enhancement factors and sensitivities of dye molecules on different films are consistently within the IG/ID ratios of graphene-based substrates, indicating that the dramatically enhanced Raman spectra on graphene-based films are strongly dependent on the average size of sp2 carbon domain.
机译：石墨烯及其衍生物已被证明是良好的表面增强拉曼散射（SERS）衬底。但是，文献对基于石墨烯的材料的SERS效应提供了一些不同的看法。因此，了解石墨烯的SERS增强机理对于探索其作为SERS底物的应用至关重要。在本研究中，制备了具有不同形态和结构的氧化石墨烯（GO）和化学还原氧化石墨烯（CRGO）膜，并将其用作SERS底物以检测拉曼染料分子。观察到的增强因子可高达10〜10 3 。讨论了SERS增强的机制。结果表明，SERS效应与染料分子的吸附和石墨烯基薄膜的表面形态无关。在不同的基于石墨烯的薄膜上观察到拉曼位移，并且几乎相同，这表明染料分子与底物之间存在电荷转移。拉曼增强因子和不同膜上染料分子的敏感性始终在石墨烯基基质的IG / ID比之内，这表明石墨烯基薄膜上显着增强的拉曼光谱强烈依赖于sp 的平均尺寸2 碳域。

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