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以巯基乙酸为稳定剂,在水溶液中一步合成了CdTe量子点.以该量子点为荧光探针,基于荧光猝灭法对Cu2+离子进行了定量检测.考察了缓冲体系、缓冲液浓度、缓冲液pH值、反应时间、量子点浓度等多种因素的影响,在0.033mol/L、pH值为5.91的磷酸二氢钾磷酸氢二钠缓冲液中,当量子点浓度为3.8×10-4mol/L、反应时间为30min时,该方法的线性区间为2～200μg/L,检测下限为0.29μg/L.具体解释了量子点荧光猝灭,是由于价带电子激发到导带以后被表面结合的Cu2+离子捕获而产生的结果,并利用光解实验进一步验证了这一机理.
CdTe QDs were synthesized in aqueous solution using thioglycolic acid as the stabilizer, and Cu2 + ions were quantitatively detected by fluorescence quenching method using the QDs as fluorescent probes. The effects of buffer system, buffer concentration, buffer pH, reaction time, quantum dot concentration and other factors, in 0.033mol / L, pH 5.91 potassium dihydrogen phosphate disodium hydrogen phosphate buffer, when the quantum dot concentration of 3.8 × 10-4mol / L, the reaction time is 30min, the linear range of this method is 2 ~ 200μg / L and the detection limit is 0.29μg / L. It is explained that the fluorescence quenching of QDs is due to the binding of the valence band electrons to the conduction band Of Cu2 + ions captured the results, and the use of photolysis experiments to further verify this mechanism.