MPA稳定的CdTe量子点合成及Cu^(2+)检测应用  

Synthesis of 3-mercaptopropionic acid-stabilized CdTe quantum dots and its application for the detection of Cu^(2+)

作　　者：江波[1] 黄麒[2] 卢强[1] 李曹龙[2,3] 王飞[2] 仁青加[3] 仁增[3] 

机构地区：[1]四川省地质矿产勘查开发局成都水文地质工程地质队,成都610100 [2]中国药科大学理学院无机化学教研室,南京211169 [3]西藏藏医学院科研所,拉萨850000

出　　处：《中国药科大学学报》2017年第3期311-316,共6页Journal of China Pharmaceutical University

基　　金：国家自然科学基金资助项目(No.81660708);西藏自治区科技厅重点资助项目(No.2015XZ01G70)~~

摘　　要：通过水相法制备3-巯基丙酸(MPA)稳定的碲化镉量子点(CdTe QDs),即MPA-CdTe QDs。研究Cu^(2+)对发射波长为599 nm的MPA-CdTe QDs荧光猝灭效应,发现Cu^(2+)浓度与荧光猝灭强度之间满足Stern-Volmer修正方程的线性关系。通过多项式拟合得出Cu^(2+)浓度在2.28×10^(-6)~18.24×10^(-6)mol/L和4.8×10^(-7)~12×10^(-7)mol/L两个区间范围内与MPA-CdTe QDs的荧光强度F_0/F的多项式关系分别为:F_0/F=7.999-2.470c+0.339c^2,F_0/F=3.154-0.160 c+0.049 c^2,拟合度分别为0.991,0.993。MPA-CdTe QDs对Cu^(2+)检测限可达1.326×10^(-7)mol/L。The water-soluble 3-mercaptopropionic acid（MPA）-stabilized CdTe（MPA-CdTe）quantum dots（QDs）were synthesized by aqueous suspension. The study showed that the fluorescence quenching process of Cu^2＋ to MPA-CdTe QDs, whose largest emission peak was 599 nm, could be described well by the theory of fluorescence quenching in competitive absorption systems and its modification of Stern-Volmer equations. By fittings, the results showed a good polynomial relationship between the fluorescence intensity F0/F and the concentration of Cu^2＋, when the concentration was in the range of 2. 28×10^-6-18. 24×10^-6 mol/L and 4. 8×10^-7-12×10^-7mol/L, and two polynomial equations were respectively elucidated based on dynamic and static quenching in competitive-absorption systems： F0/F=7. 999-2. 470c ＋0. 339 c2, F0/F=3. 154-0. 160 c＋0. 049 c2 and degree of fitting are 0. 991 and 0. 993, respectively. The detection limit was 1. 326×10^-7.

关 键 词：水溶性MPA-CdTe量子点 Cu^2+检测 Stern-Volmer方程修正式 多项式拟合 

分 类 号：O657.3[理学—分析化学] TB383.1[理学—化学]