1. Illustration of the construction of QDs/Au NPs assembly

2. TEM images of (a) Au NPs, (b) QDs and Au NP/QDs assembly, and (d) HRTEM image of Au NP/QDs assembly

3. (a) UV-Vis absorption spectrum of Au NPs and emission spectrum of CdSe/12ZnS QDs excited at 400 nm. The inset is the emission spectra of CdSe QDs/Au NPs complex before (black) and after (red) addition of AChE and ATC; (b) Emission spectra of different systems. The concentration of QDs, Au NPs, ATC, AchE, and DCNP are 70 nmol/L, 3.5 nmol/L, 0.05 mmol/L, 1.0×10^-3 U/L and 5.0×10^-6 mol/L, respectively

4. (a) Emission intensity of QDs before and after forming assembly and (b) quenching efficiency (F_Q/F_Q0) with different Au NPs (7 nmol/L) to QDs ratio

5. Fluorescence recovery of the system in the presence of AChE (1.0×10^-7~1.0×10^-1 U/L)

6. (a) Emission spectroscopy of system in presence of different concentrations of DCNP (5.0×10^-9~5.0×10^-4 mol/L) with inset showing the corresponding picture of solutions (DCNP increase from left to right); (b) F_R/F_R0 varied as a function of concentration of DCNP with inset showing the linear calibration of F_R/F_R0 on the logarithmic concentration of DCNP

7. Fluorescence recovery of the system in the presence of DCNP (5×10^-4 mol/L) premixed with different disruptors (5×10^-4 mol/L)