巯基乙胺修饰的CdTe量子点对Co^(2+)的荧光响应

Fluorescence Response of Cysteamine Modified CdTe Quantum Dots to Co^(2+)

采用水热合成方法制备出不同粒径大小的巯基乙胺(CA)修饰的CdTe(CA-CdTe)量子点,并研究CA-CdTe量子点对Co^(2+)的荧光响应情况。研究表明Co^(2+)对CA-CdTe量子点的荧光具有猝灭作用,并且随着Co^(2+)浓度的增加,CA-CdTe量子点的荧光强度逐渐降低。当Co^(2+)浓度在0.3×10^(-5)~33×10^(-5)mol·L^(-1)范围内时,获得了Co^(2+)与粒径大小为3.60 nm的CA-CdTe量子点相互作用的Stern-Volmer荧光猝灭方程,线性相关系数R^2为0.998,检出限为6.547×10^(-7)mol·L^(-1)。利用CA-CdTe量子点荧光分析方法对Co^(2+)进行定量分析和检测研究,该方法简便、快速、检出限较低,并为实际水样中Co^(2+)的检测分析提供了理论基础。

The cysteamine （CA） modified CdTe （CA-CdTe） quantum dots （QDs） with different particle sizes were prepared by hydrothermal method. And the fluorescence response of CA-CdTe QDs to Co2＋ was measured and analysed. The results indicate that Co2＋ can quench the fluorescence of CA-CdTe QDs. With the increase of Co2＋ concentration, the fluorescence intensity of CA-CdTe QDs was gradually decreased. When Co2＋ concentration is in the range of 0.3 × 10^-5 ~33× 10^-5 mol.L-1, the Stern-Volmer quenching equation of the interaction between Co2＋ and CA-CdTe QDs with particle size 3.60 nm is obtained, and the detectionlimit is 6.547×10^-7 mol.L-1. The method of quantitative detection of Co2＋ based on the CA-CdTe QDs fluorescence analysis method, is simple, rapid, and with low detection limits, which provides a theoretical basis for detecting Co2＋ in real water samples.