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†,
       

TEM images of Au@SiO2 NPs with core sizes of (curve a) 15 nm, (curve b) 25 nm, and (curve c) 50 nm, and corresponding SERS spectra of Rh6G molecule adsorbed in the gap between Au@SiO2 NPs. Laser: 632.8 nm, 20 mW.