Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate

Figure 2

Plots of blank adjusted Raman signal versus concentrations of analyzed chemicals for SERS assay on unmodified Al foil: (a) for CV and NBT; (b) for KNO₃. (c) SERS spectra (vertically adjusted to prevent overlap) for KNO₃ at 4 detectable concentrations and blank, taken with 785 nm laser excitation.

(a)

(b)

(c)