Determination of silver ion based on the redshift of emission wavelength of quantum dots functionalized with rhodanine  

作　　者：Li Chen Qin Zhao Xiao-Yan Zhang Guan-Hong Tao 

机构地区：[1]College of Chemistry.Chemical Engineering and Materials Science,Soochow University [2]School of Chemistry and Chemical Engineering,Nantong University

出　　处：《Chinese Chemical Letters》2014年第2期261-264,共4页中国化学快报（英文版）

基　　金：The National Natural Science Foundation of China is thanked for financial support(Nos.20345006 and 20575043)

摘　　要：A simple and selective method for the determination of silver ions was developed by utilizing the red- shift in emission wavelength of the core-shell CdSe/Cd5 quantum dots （QDs） functionalized with rhodanine upon the addition of Ag＋. A linear relationship was observed between the shift and the increase in concentration of Ag＋ in the range of 0.0125-12.5 μmol/L. The mechanism of the red-shift was investigated and suggested that the coordination between Ag＋ and rhodanine on the QDs surface caused an increase of particle size, which resulted in the red-shift of the QDs＇ emission wavelength. A detection limit of 2 nmol/L was achieved. The developed method showed superior selectivity and was successfully applied to the determination of silver in environmental samples.A simple and selective method for the determination of silver ions was developed by utilizing the red- shift in emission wavelength of the core-shell CdSe/Cd5 quantum dots （QDs） functionalized with rhodanine upon the addition of Ag＋. A linear relationship was observed between the shift and the increase in concentration of Ag＋ in the range of 0.0125-12.5 μmol/L. The mechanism of the red-shift was investigated and suggested that the coordination between Ag＋ and rhodanine on the QDs surface caused an increase of particle size, which resulted in the red-shift of the QDs＇ emission wavelength. A detection limit of 2 nmol/L was achieved. The developed method showed superior selectivity and was successfully applied to the determination of silver in environmental samples.

关 键 词：Quantum dots SILVER REDSHIFT RHODANINE 

分 类 号：O657.3[理学—分析化学] O614.122[理学—化学]