title: Surface-enhanced Raman scattering from AgNP-graphene-AgNP sandwiched nanostructures.
abstract: We developed a facile approach toward hybrid AgNP-graphene-AgNP sandwiched structures using self-organized monolayered AgNPs from wet chemical synthesis for the optimized enhancement of the Raman response of monolayer graphene. We demonstrate that the Raman scattering of graphene can be enhanced 530 fold in the hybrid structure. The Raman enhancement is sensitively dependent on the hybrid structure, incident angle, and excitation wavelength. A systematic simulation is performed, which well explains the enhancement mechanism. Our study indicates that the enhancement resulted from the plasmonic coupling between the AgNPs on the opposite sides of graphene. Our approach towards ideal substrates offers great potential to produce a "hot surface" for enhancing the Raman response of two-dimensional materials.
authors.affiliation: Department of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai, 200240, China. lizhan@sjtu.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Yijun
authors.initials: Y
authors.lastname: Xu
authors.forename: Pengyu
authors.initials: P
authors.lastname: Xu
authors.forename: Zhenghui
authors.initials: Z
authors.lastname: Pan
authors.forename: Sheng
authors.initials: S
authors.lastname: Chen
authors.forename: Qishen
authors.initials: Q
authors.lastname: Shen
authors.forename: Li
authors.initials: L
authors.lastname: Zhan
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Weihai
authors.initials: W
authors.lastname: Ni