FDTD simulation study of size/gap and substrate-dependent SERS activity study of Au@SiO2 nanoparticles
Yang Jing-Liang, Li Ruo-Ping, Han Jun-He, Huang Ming-Ju†,
       

SEM images of Au@SiO2 NPs monolayer film on the silicon (a) and gold film (b). (c) Scheme for SERS detection with R6G molecules adsorbed in the gap between Au@SiO2 NPs and Si (curve a1), R6G molecules adsorbed in the gap between NPs (curve a2), R6G molecules adsorbed in the gap between NPs (curve b1), and R6G molecules adsorbed in the gap between NPs and Au film (curve b2).