Citation: Li Chen, Qin Zhao, Xiao-Yan Zhang, Guan-Hong Tao. Determination of silver ion based on the redshift of emission wavelength of quantum dots functionalized with rhodanine[J]. Chinese Chemical Letters, ;2014, 25(2): 261-264. shu

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

Li Chen ^a ,
Qin Zhao ^a,b ,
Xiao-Yan Zhang ^a ,
Guan-Hong Tao ^a,,

1.
a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;
2.
b School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China

Corresponding author: Guan-Hong Tao,
Received Date: 7 August 2013
Available Online: 26 September 2013
Fund Project:

A simple and selective method for the determination of silver ions was developed by utilizing the redshift in emission wavelength of the core-shell CdSe/CdS 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. Themechanism 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.
- Quantum dots,
- Silver,
- Redshift,
- Rhodanine
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沈阳化工大学材料科学与工程学院沈阳 110142