Synthesis of 3-mercaptopropionic acid-stabilized CdTe quantum dots and its application for the detection of Cu2+
10.11665/j.issn.1000-5048.20170310
- VernacularTitle:MPA稳定的CdTe量子点合成及CH2+检测应用
- Author:
Bo JIANG
;
Qi HUANG
;
Qiang LU
;
Caolong LI
;
Fei WANG
;
Qingjia REN
;
Zeng REN
- Keywords:
water-soluble MPA-CdTe quantum dots;
detection of Cu2+;
modified Stern-Volmer equation;
polynomial fitting
- From:
Journal of China Pharmaceutical University
2017;48(3):311-316
- CountryChina
- Language:Chinese
-
Abstract:
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 Cu2+ 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 Cu2+,when the concentration was in the range of 2.28 × 10-6-18.24 × 10-6 mol/L and 4.8 × 10-7-12 × 10-7 mol/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.
