Surface enhanced Raman scattering of gold nanoparticles supported on copper foil with graphene as a nanometer gap
Surface enhanced Raman scattering of gold nanoparticles supported on copper foil with graphene as a nanometer gap
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以石墨烯为纳米间隙的铜箔负载金纳米粒子的表面增强拉曼散射
DOI：
10.1088/0957-4484/27/7/075201
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发表时间：
2016-02-09
期刊：
影响因子：
3.5
通讯作者：
Duan, Huigao
中科院分区：
文献类型：
--
作者：
Xiang, Quan;Zhu, Xupeng;Duan, Huigao
金属纳米结构之间具有单纳米尺寸（<10 nm）的间隙使得能够实现表面增强拉曼散射（Sers）的巨大局部场增强。单层石墨烯是在等离子体纳米结构之间获得亚纳米间隙的理想候选物。在这项工作中，我们展示了一种简单的方法来实现一个亚纳米间隙，通过去湿的单层石墨烯生长在铜箔上的金膜支持。铜箔可以用作支持虚电荷振荡的低损耗等离子体活性金属膜，而石墨烯不仅可以为大规模等离子体场增强创建稳定的亚纳米间隙，而且还可以用作化学增强剂。与Cu膜上的Au纳米颗粒或石墨烯-SiO2-Si上的纳米颗粒相比，我们在这种石墨烯缺口结构中获得了更高的Sers增强。此外，测量的拉曼信号在长时间内保持其精细特征和强度，表明这种Au-石墨烯-Cu混合配置作为Sers基底的稳定性。
Gaps with single-nanometer dimensions (<10 nm) between metallic nanostructures enable giant local field enhancements for surface enhanced Raman scattering (SERS). Monolayer graphene is an ideal candidate to obtain a sub-nanometer gap between plasmonic nanostructures. In this work, we demonstrate a simple method to achieve a sub-nanometer gap by dewetting a gold film supported on monolayer graphene grown on copper foil. The Cu foil can serve as a low-loss plasmonically active metallic film that supports the imaginary charge oscillations, while the graphene can not only create a stable sub-nanometer gap for massive plasmonic field enhancements but also serve as a chemical enhancer. We obtained higher SERS enhancements in this graphene-gapped configuration compared to those in Au nanoparticles on Cu film or on graphene–SiO2–Si. Also, the Raman signals measured maintained their fine features and intensities over a long time period, indicating the stability of this Au–graphene–Cu hybrid configuration as an SERS substrate.