Li Xinjuan, Liu Yanqi, Zeng Zhuo, Wang Peijie, Fang Yan, Zhang Lisheng
The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.
The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 5;190:378-382. doi: 10.1016/j.saa.2017.07.069. Epub 2017 Jul 31.
Tip-enhanced Raman scattering (TERS) is a promising analytical approach for some two-dimensional materials and offers the possibility to correlate imaging and chemical data. Tip-enhanced Raman spectra of graphene are discussed in some details, including substrate, gap between tip-apex and sample surface as well as Ag-nanowire. The TERS spectra give special emphasis to the possibility of TERS tip to induce a large number of defects only while got the tip attached to sample surface. Then the dependence of the TERS spectra of graphene and gap between the probe tip and sample surface was studied, and distribution features of electromagnetic (EM) field around tip were also simulated by finite-difference time-domain (FDTD). The Raman signal enhancement of graphene was further discussed with respect to experimental data. Furthermore, the Ag-nanowire as a nano-antenna could significantly enhance the weak Raman signal of D-band of monolayer graphene is shown, and the TERS spectra of graphene with regard to different regions of Ag-nanowires (endpoints, body) were obtained toward investigating into the distribution of electromagnetic field.
针尖增强拉曼散射（TERS）是一种用于某些二维材料的很有前景的分析方法，它提供了将成像数据与化学数据相关联的可能性。本文详细讨论了石墨烯的针尖增强拉曼光谱，包括基底、针尖顶端与样品表面之间的间隙以及银纳米线。TERS光谱特别强调了TERS针尖仅在附着于样品表面时才会诱导大量缺陷的可能性。然后研究了石墨烯的TERS光谱与探针针尖和样品表面之间间隙的关系，并通过时域有限差分法（FDTD）模拟了针尖周围电磁场的分布特征。结合实验数据进一步讨论了石墨烯的拉曼信号增强。此外，研究表明银纳米线作为一种纳米天线可以显著增强单层石墨烯D波段的微弱拉曼信号，并且针对银纳米线的不同区域（端点、主体）获得了石墨烯的TERS光谱，以研究电磁场的分布。
