▎ 摘　　要

Based on the electrostatic interaction, we constructed a ratiometric fluorescence nanomixture of graphene quantum dots-gold nanoclusters (GQDs-AuNCs) for the quantitative detection of Cu2+ and Cd2+. When Cu2+ or Cd2+ was added into the reaction system, the fluorescence of GSH-AuNCs at 565 nm can be quenched by Cu2+ and enhanced by Cd2+ while the intensity of N-GQDs at 403 nm stayed constant. Under the optimized conditions, the fluorescence intensity ratio (I-565/I-403) of the GQDs-AuNCs system was proportional to the concentration of Cu2+ and Cd2+ in the range of 8x10(-8) mol/L-6x10(-6) mol/L and 1x10(-6) mol/L-4x10(-5) mol/L, respectively, with detection limits of 4.12x10(-9) mol/L and 9.43x10(-7) mol/L, respectively. In the presence of Cu2+ and Cd2+, the paper-based vision sensor would produce visible fluorescent color changes, which can be used for rapid detection on site. The method has been successfully applied to the determination of Cu2+ and Cd2+ in scallops with satisfactory results.