Figure 4From: Reusable three-dimensional nanostructured substrates for surface-enhanced Raman scatteringSERS spectra (a,c) and enhancement factor (EF) of monolayer R6G adsorbed on hemispherical nanostructures (b,d). Nanostructures with different thicknesses of adhesion layer. (a,b) Cr (Chromium). (c,d) Ti (Titanium) between the quartz substrate and noble metal film. The unpatterned samples were coated with 5-nm-thick adhesive layer.Back to article page