Fig. 1. Schematic illustration of fabrication strategy of SAMs for detection of Pueraria

Fig. 2. (a) The fluorescence, UV-Vis absorption spectra and (b) Decay curve of FCDs solution

Fig. 3. (a) The XPS scanning spectrum, The high-resolution (b) C(1s), (c) O(1s), (d) N(1s), and (e) S(2p) XPS spectra of FCDs, (f) HRTEM images of the FCDs; Inset: the corresponding particles size distribution histograms of FCDs from 100 particles

Fig. 4. (a) The absorption and (b) fluorescence spectra of 1.0 g·L^-1 DA solution in pH 8.5 Tris-HCl and the (c) cyclic voltammogram and (d) the AC impedance diagram of FTO/PDA

Fig. 5. (a) The absorption of FTO/PDA-AgN film and (b) fluorescence spectra of FTO/PDA-rGO/[PSS/PDDA]_n/FCDs SAMs formed by immersion in AgNO₃ in different time; (c) The SEM image and EDS of AgN

Fig. 6. The fluorescence spectra of FCD-adsorbed SAMs with (red) and without (black) AgN as a function of spacer (PDDA/PSS)_n (n=1~5) bilayers

Fig. 7. Confocal fluorescence image of (a) FTO/PDA/PDDA/[PSS/PDDA]₃/FCDs, (b) FTO/PDA-AgN/PDDA/[PSS/PDDA]₃/FCDs and (c) the fluorescence decay curves

Fig. 8. (a) Fluorescence spectra of FTO/PDA-AgN/PDDA/[PSS/PDDA]₃/FCDs SAMs for different concentrations of Pue; (b) Calibration curve of FTO/PDA/PDDA/[PSS/PDDA]₃/FCDs (black) and FTO/PDA-AgN/PDDA/[PSS/PDDA]₃/FCDs (red) SAMs