合成了弱配体柠檬酸三钠修饰的CdS量子点(Cit-CdS QDs),透射电子显微镜表征结果表明,Cit-CdS QDs的粒径分布均匀(4 ～6 nm),分散性好.研究了金属离子(银(Ⅰ)离子、镉(Ⅱ)离子)、巯基化合物(巯基乙酸、半胱氨酸)以及金属离子(银(Ⅰ)离子、镉(Ⅱ)离子)与巯基化合物形成的配合物对Cit-CdS QDs荧光的影响.发现金属离子(银离子、镉离子)与巯基化合物(巯基乙酸、半胱氨酸)形成的水溶性配合物可以显著增强Cit-CdS QDs的荧光,配合物对Cit-CdS QDs的增强程度比单独的金属离子或巯基化合物均要高,而且配合物修饰的CdS QDs对铜(Ⅱ)离子的响应要高于单独用金属离子或巯基化合物修饰的量子点.建立了铜(Ⅱ)离子高灵敏度荧光检测方法,该方法检测范围宽(1.0×10-8～1.0×10ˉ6 mol/L),检测限低(1.0×10ˉ9 mol/L)且具有很好的选择性,拓展了配合物作为量子点修饰剂的应用.
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