Fig. 4. (a) Absorption spectra of Rh-6G and S4 specimen (black solid line) and emission spectrum of Rh-6G (blue dotted line) in aqueous medium. (b) Schematic of the possible interaction pathway between Rh-6G and TSC-stabilized GNs. (c) PL emission spectra of Rh-6G (0.4 μM) in the presence of S4 specimen with an increase in the concentration of GNs from 0–12 μM. (d) Plot of the intensity ratio of the PL emission spectra of Rh-6G after and before the addition of GNs, where the scattered points are the experimental points and the solid line is the Stern–Volmer fitting.
