▎ 摘　　要

A novel strategy was developed for fluorescent detection of Pb2+ in aqueous solution based on the fact that graphene oxide (GO) could quench the fluorescence of amino pyrene (AP)-grafted gold nanoparticles (AP-AuNPs) and Pb2+ could accelerate the leaching rate of AuNPs in the presence of S2O32-. In this system, fluorescence reporter AP was grafted on AuNPs through the Au-N bond. In the presence of GO, the system shows fluorescence quenching because of pi-pi stacking between AP and GO. With the addition of Pb2+ and S2O32-, the system displays fluorescence recovery, which is attributed to the fact that Pb2+ could accelerate the leaching of the AuNPs from GO surfaces and release of AP into aqueous solution. Interestingly, the concentration of GO could control the fluorescence "turn-off" or "turn-on" for Pb2+ detection. In addition, GO is also an excellent promoter for the acceleration of the leaching of AuNPs and shortening the analytical time to similar to 15 min. Under the optimal conditions, the fluorescence Pb2+ sensor shows a linear range from 2.0 X 10(-9) to 2.3 X 10(-7) mol/L, with a detection limit of 1.0 X 10(-10) mol/L.