Targeting to obtain better water solubility and stability and less aggregation-caused quenching effects of quantum dots, two kinds of thiol molecules, glutathione and L-cysteine, were firstly united to offer stabilizing ligands for aqueous synthesized CdS quantum dots, which exhibited sensitive aggregation-induced emission properties. Fluorescent intensity of the CdS quantum dots was enhanced about 5 folds by simple solvent exchange from water to 90 vol% PEG200. Restriction of intramolecular motions in an aggregate state was probably the main cause of the phenomenon. At the same time, fluorescent intensity of CdS quantum dots in the presence of zinc ions was able to be enhanced about 2.2 folds. Based on the researches, a handy metal enhanced fluorescent probe for detecting zinc ions was established. And the detection limit was 0.58 μmol/L. Zinc ions as a bridge among CdS quantum dots to form aggregates limited motions of CdS quantum dots to a certain extent and simultaneously enhanced their fluorescence emission intensities. Meanwhile, activation of surface states of CdS quantum dots also led to emission enhancement. Both of the two factors together contributed to the fluorescence enhancement and ultimately to the sensitivity to zinc ion sample detection.

为了获得更好的水溶性和稳定性并减少量子点的聚集引起的猝灭作用，首先将两种硫醇分子谷胱甘肽和L-半胱氨酸结合起来，为水性合成的CdS量子点提供稳定的配体，这些量子点表现出敏感的聚集-感应发射特性。通过从水到90 vol％PEG200的简单溶剂交换，CdS量子点的荧光强度提高了约5倍。聚集状态下分子内运动的限制可能是该现象的主要原因。同时，在存在锌离子的情况下，CdS量子点的荧光强度可以提高约2.2倍。在此基础上，建立了一种方便的金属增强荧光探针，用于检测锌离子。检出限为0.58μmol/ L。锌离子作为CdS量子点之间的桥梁，在一定程度上形成聚集体限制CdS量子点的运动，并同时增强其荧光发射强度。同时，CdS量子点表面态的活化也导致发射增强。这两个因素共同促进了荧光增强，并最终提高了对锌离子样品检测的敏感性。