289371.fig.009a
(a)
289371.fig.009b
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Figure 9: (a) SERS spectra of 15 nm Au NPs multilayer structure and thermally evaporated Au film. (1) (blue curve) a standard Au thermally evaporated film of 30 nm, (2) (violet curve) one monolayer of gold nanoparticles deposited onto an SAMs-coated silicon wafer, (3) (red curve) three layers of nanoparticles hybrid architecture, and (4) (dark green curve) five layers of nanoparticles hybrid architecture. (b) SERS spectra of 5 nm Au NPs multilayer structure (1) (green curve), one monolayer of gold nanoparticles deposited onto an SAMs-coated silicon wafer, (2) (dark blue curve) two layers of nanoparticles hybrid architecture, (3) (blue curve) three layers of nanoparticles hybrid architecture, and (4) (pink curve) four layers of nanoparticles hybrid architecture.