相关拉曼成像和扫描电子显微镜：单个Ga岛在石墨烯表面增强拉曼光谱中的作用
Correlative Raman Imaging and Scanning Electron Microscopy: the Role of Single Ga Islands in Surface-Enhanced Raman Spectroscopy of Graphene
摘要：
表面增强拉曼光谱（SERS）是一种具有前瞻性的非破坏性分析技术，可以检测单个纳米物体，甚至单分子。.本文采用超高真空蒸发法在CVD石墨烯上沉积Ga岛，并利用相关拉曼成像和扫描电子显微镜（RISE）研究了Ga岛的形貌和局域光学响应。与之前的论文相反，其中仅研究了来自石墨烯上的整个非均匀Ga NPs集合的积分拉曼响应，RISE技术使我们能够检测由单个Ga岛增强的石墨烯拉曼峰，特别是将拉曼信号与这些单个颗粒的形状和尺寸相关联。以这种方式，并通过支持的数值模拟，我们已经证明了与局域表面等离子体共振（LSPR）的拉曼信号增强的等离子体性质。已经发现，这种增强是岛的大小依赖，并显示了最大的中型Ga岛。在Ga岛附近的电场的等离子体增强的模拟和相应的拉曼峰的实验强度之间的合理协议证明了被称为表面增强拉曼光谱的观察到的效果的等离子体起源。
英文摘要：
Surface enhanced Raman spectroscopy (SERS) is a perspective non-destructive analytic technique enabling detection of individual nanoobjects, even single-molecules. . In the paper, we have studied the morphology of Ga islands deposited on CVD graphene by ultrahigh vacuum (UHV) evaporation and local optical response of this system by the correlative Raman Imaging and Scanning Electron Microscopy (RISE). Contrary to the previous papers, where only an integral Raman response from the whole ununiformed Ga NPs ensembles on graphene was investigated, the RISE technique has enabled us to detect graphene Raman peaks enhanced by single Ga islands and particularly to correlate the Raman signal with the shape and size of these single particles. In this way and by a support of numerical simulations, we have proved a plasmonic nature of the Raman signal enhancement related to localized surface plasmon resonances (LSPR). It has been found that this enhancement is island-size dependent and shows a maximum for medium-sized Ga islands. A reasonable agreement between the simulations of the plasmon enhancement of electric fields in the vicinity of Ga islands and the experimental intensities of corresponding Raman peaks proved the plasmonic origin of the observed effect known as the Surface Enhanced Raman Spectroscopy.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
