title: Electromagnetic Enhancement of Graphene Raman Spectroscopy by Ordered and Size-Tunable Au Nanostructures.
abstract: 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.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510641, China. mssgzhang@scut.edu.cn.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Lab of Semiconductor Materials Science, Institute of Semiconductors, CAS, Beijing, 100083, China. xwzhang@semia.ac.cn.
authors.forename: Xingwang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Lab of Semiconductor Materials Science, Institute of Semiconductors, CAS, Beijing, 100083, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
keywords: Graphene; Ordered Au nanostructures; Raman scattering; Surface plasmons