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本文以半胱氨酸和谷胱甘肽为稳定剂,在温和条件下制备了CdTe半导体量子点(或称纳米晶),基于荧光淬灭原理,实现了对Cu2+的定量检测。系统考察了影响量子点光学性质的各种因素,在pH值为6.2的磷酸盐缓冲溶液中,量子点的浓度(以Cd2+计)为1.013×10-4mol/L时,此方法对浓度在2-260μg/L范围内的Cu2+淬灭程度呈很好的线性关系,该方法的检出限为0.15μg/L。在同类方法中,目前尚无如此低的检出限和如此宽的线性响应区间。最后对这种新型量子点监测的高灵敏度的原因和淬灭机理进行了初步推测。
In this paper, CdTe semiconductor quantum dots (or nanocrystals) were prepared under mild conditions using cysteine and glutathione as stabilizers. Based on the principle of fluorescence quenching, the quantitative detection of Cu2 + was realized. The influence of various factors on the optical properties of QDs was systematically investigated. When the concentration of QDs (calculated as Cd2 +) was 1.013 × 10-4mol / L in pH 6.2 phosphate buffer solution, The quenching degree of Cu2 + in the range of -260μg / L showed a good linear relationship. The detection limit of this method was 0.15μg / L. In the same method, there is currently no such low detection limit and such a wide range of linear response. Finally, the reason for the high sensitivity of this new quantum dot monitoring and the quenching mechanism are preliminarily estimated.