Zhang Shuguang, Zhang Xingwang, Liu Xin
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510641, China.
Key Lab of Semiconductor Materials Science, Institute of Semiconductors, CAS, Beijing, 100083, China.
Nanoscale Res Lett. 2015 Dec;10(1):390. doi: 10.1186/s11671-015-1098-6. Epub 2015 Oct 6.
The size-controllable and ordered Au nanostructures were achieved by applying the self-assembled monolayer of polystyrene microspheres. Few-layer graphene was transferred directly on top of Au nanostructures, and the coupling between graphene and the localized surface plasmons (LSPs) of Au was investigated. We found that the LSP resonance spectra of ordered Au exhibited a redshift of ~20 nm and broadening simultaneously by the presence of graphene. Meanwhile, the surface-enhanced Raman spectroscopy (SERS) of graphene was distinctly observed; both the graphene G and 2D peaks increased induced by local electric fields of plasmonic Au nanostructures, and the enhancement factor of graphene increased with the particle size, which can be ascribed to the plasmonic coupling between the ordered Au LSPs and graphene.
通过应用聚苯乙烯微球的自组装单层实现了尺寸可控且有序的金纳米结构。少层石墨烯直接转移到金纳米结构的顶部，并研究了石墨烯与金的局域表面等离子体激元（LSPs）之间的耦合。我们发现，有序金的LSP共振光谱由于石墨烯的存在而呈现出约20纳米的红移并同时展宽。同时，清晰地观察到了石墨烯的表面增强拉曼光谱（SERS）；石墨烯的G峰和2D峰都因等离子体金纳米结构的局部电场而增强，并且石墨烯的增强因子随颗粒尺寸增加，这可归因于有序金LSPs与石墨烯之间的等离子体耦合。
