Fig. 1. Schematic diagram of the preparation of nanoporous silver

Fig. 2. SEM images of Ag-Zn alloy precursors and nanoporous silver substrates obtained by free corrosion for different time, as well as SERS spectra of 10⁻⁶ mol/L CV molecules collected on different substrate surfaces

Fig. 3. Cyclic voltammetry

Fig. 4. Current-time curves under constant potential corrosion

Fig. 5. Morphology and performance characterization of nanoporous silver formed at different electrochemical dealloying time

Fig. 6. Raman spectrum of CV on silicon and SERS spectrum of 10⁻¹² mol/L CV on nanoporous silver