Figure 7From: Fabrication and evolution of multilayer silver nanofilms for surface-enhanced Raman scattering sensing of arsenate SERS spectra of arsenate at the different concentrations using Ag/GL-5/2.5-18 as an active substrate: (a) 0, (b) 5, (c) 25, (d) 75, and (e) 150 μg·L -1. The spectra were shifted vertically for clarity but the relative intensity was kept unchanged.Back to article page