“…Quantum dots (QDs) have become a research hotspot because of their excellent photophysical properties, for example, tunable and narrow emission spectrum, high quantum yield, and high stability and photobleaching threshold [ 15 ]. Benefiting from these properties, QDs have been widely used as photocatalysts [ 16 , 17 ], photoelectric devices [ 18 ], biological imaging [ 19 ] and fluorescent probes [ 20 ]. Due to the excellent properties of QDs and the high extinction coefficient of AuNPs, various novel fluorescence sensors are composed of AuNPs and QDs, which are developed for the detection of thiourea [ 20 ], cysteine [ 21 ], and organophosphorus pesticide [ 22 ].…”