Fig. 3. (a) Absorption spectrum of the AuNPs and fluorescence emission spectrum of RB, inset: AuNPs under visible light. (b) Fluorescence spectrum of RB mixed with different concentrations of Au NPs. (c) Fluorescence spectrum of RB mixed with different concentrations of AuNPs with 400 nM aptamer. (d) Fluorescence spectra of RB mixed with different concentrations of the aptamer.
