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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 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 redshift in emission wavelength of the core-shell CdSe / CdS quantum dots (QDs) functionalized with rhodanine upon the addition of Ag ~ +. A linearity 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. was developed applied to the determination of silver in environmental samples.