Fig. 3From: A New Smart Surface-Enhanced Raman Scattering Sensor Based on pH-Responsive Polyacryloyl Hydrazine Capped Ag Nanoparticles a Schematic illustration of the fabrication SERS process of R6G on Ag@PAH NPs substrates. b Schematic illustration for the tunable SERS mechanism of R6G with Ag@PAH NPs at different pH valuesBack to article page