L-半胱氨酸修饰CdS量子点检测银离子  

Determination of Silver Ion with L-cysteine Capped CdS Quantum Dots

作　　者：开小明[1] 方皓文 高迎春[1] 

机构地区：[1]安庆师范学院化学化工学院,安徽省安庆市菱湖南路128号246011 [2]安徽省桐城师范高等专科学校理工系,安徽省桐城市龙眠西路58号231400

出　　处：《光谱实验室》2014年第6期743-745,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：室温一步合成了L-半胱氨酸修饰的CdS量子点，具有水溶性和生物相溶性。在0．0050mol／L磷酸缓冲溶液中，于L-半胱氨酸存在下，银离子对CdS量子点荧光发射有显著的增敏作用，CdS量子点荧光发射峰位置逐渐由545nm向558nm红移，CdS量子点荧光强度与银离子的浓度成线性关系，方法的线性响应范围为2．0×10^-7-1．0×10^-6mol／L，检出限为2．1×10^-8mol／L。是一种简单，迅速，灵敏且可操作的检测银离子的新方法。At room temperature with L-eysteine Capped CdS quantum dots has been prepared by one step. They are water-soluble and bioeompatible. In 0.0050 mol/L PBS buffer solution, some amounts of fresh L-eysteine were added to funetionalized CdS solution. Based on the enhancement of characteristic fluorescence emission of CdS at 545 nm by silver ions in the presence of fresh L-cysteine, then, a gradual red shift of fluorescence emission peak of CdS around from 545 nm to 558 nm was observed. The characteristic fluorescence intensity of CdS is linearly proportional to silver concentration from 2.0×10^-7-1.0×10^-6mol/L with a detection limit of 2.1×10^-8mol/L. A simple, rapid, sensitive and specific detection method for silver ion was proposed.

关 键 词：CDS量子点 荧光 荧光探针 

分 类 号：O614[理学—无机化学] O657.32[理学—化学]