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A novel strategy for selective detection of Ag+ based on the red-shift of emission wavelength of quantum dots

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Abstract

Selective determination of Ag(I) ion was accomplished based on the red-shift of the emission band of quantum dots (QDs). Under optimal conditions, a linear relationship does exist between the red-shift of the emission and the concentration of Ag(I) in the range from 1.0 × 10−7 to 1.5 × 10−5 mol L−1, with a detection limit of 5.0 × 10−8 mol L−1. The method has been successfully applied to the determination of Ag(I) ion in water samples. The possible reaction mechanism was investigated by ultraviolet–visible absorption, fluorescence, Raman spectroscopies and by high resolution transmission electron microscopy. The results suggest that the red-shift in emission be attributed to the stabilization of a charge-transfer state, but not due to the aggregation induced by AgI(I) ion.

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Acknowledgements

The authors gratefully acknowledge the support for this research by National Natural Science Foundation of China (20675034), the Program for academic pacesetter of Wuhan (200851430484), Nature Science foundation key project from Hubei Province of China (2008CDA080), the Youth Chengguang Project of Science and Technology of Wuhan City of China (200850731359) and Natural Science Foundation of Hubei Province (No.2008CDB031).

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Authors and Affiliations

  1. College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China

    Jing Wang, Jiangong Liang, Zonghai Sheng & Heyou Han

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  1. Jing Wang
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  2. Jiangong Liang
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  3. Zonghai Sheng
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  4. Heyou Han
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Correspondence to Heyou Han.

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Wang, J., Liang, J., Sheng, Z. et al. A novel strategy for selective detection of Ag+ based on the red-shift of emission wavelength of quantum dots. Microchim Acta 167, 281–287 (2009). https://doi.org/10.1007/s00604-009-0244-1

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  • DOI: https://doi.org/10.1007/s00604-009-0244-1

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