高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (07): 1432-1437.doi: 10.3969/j.issn.0251-0790.2012.07.012

• 分析化学 • 上一篇    下一篇

紫外-可见吸收光谱和荧光光谱研究壳核型 CdTe/CdS量子点与盐酸巴马汀的相互作用及其分析应用

殷鹏飞, 龚会平, 李萍萍, 刘正清, 何佑秋   

  1. 西南大学化学化工学院, 重庆 400715
  • 收稿日期:2011-08-09 出版日期:2012-07-10 发布日期:2012-07-10
  • 通讯作者: 何佑秋, 女, 博士, 教授, 主要从事分子光谱分析研究. E-mail: heyq@swu.edu.cn E-mail:heyq@swu.edu.cn
  • 基金资助:

    发光与实时分析重庆市重点实验室(西南大学)项目(批准号:CSTC 2006CA8006)资助.

Fluorescence Spectrometry and UV-Vis Absorption Spectra Analysis of Interaction of Core-shell CdTe/CdS QDs with Palmatine Chloride and Its Applications

YIN Peng-Fei, GONG Hui-Ping, LI Ping-Ping, LIU Zheng-Qing, HE You-Qiu   

  1. School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
  • Received:2011-08-09 Online:2012-07-10 Published:2012-07-10

摘要: 合成了巯基乙酸(TGA)修饰的壳核型CdTe/CdS量子点(TGA-CdTe/CdS QDs), 利用紫外-可见光谱和荧光光谱研究了TGA-CdTe/CdS QDs与盐酸巴马汀(PC)的相互作用机理. 结果表明, 在pH=7.4的Tris-HCl缓冲液中, QDs与PC相互作用后使QDs的荧光呈线性猝灭, 并有良好的线性关系(r=0.997), 线性范围为25~1×104 ng/mL, 检出限(3σ)为7.7 ng/mL. 建立了一种快速简便、 可定量测定PC的新方法.

关键词: CdTe/CdS量子点, 荧光猝灭法, 紫外-可见吸收光谱, 盐酸巴马汀

Abstract: Core-shell CdTe/CdS quantum dots(QDs) were synthesized using mercaptoacetic acid as stabilizer. A novel method for the determination of palmatine chloride(PC) was developed based on the quenching of the fluorescence of CdTe/CdS QDs at an excitation wavelength of 340 nm. Fluorescence spectrometry and ultraviolet-visible(UV-Vis) absorption spectra were utilized to study the interaction between CdTe/CdS QDs and PC. With the optimum reaction conditions of pH=7.4 Tris-HCl buffer solution, the quenched fluorescence intensity of CdTe/CdS QDs was linearly proportional to the concentration of PC with a correlation coefficient of r=0.997, and the detection limits were in the range of 25-1×104 ng/mL and the detection limit(3σ) for PC was 7.7 ng/mL. This new method can quickly, simply, conveniently and quantitatively detemine PC.

Key words: CdTe/CdS quantum dots, Fluorescence quenching method, UV-Vis spectra, Palmatine chloride

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