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Synthesis and characterization of water-soluble l-cysteine-modified ZnS nanocrystals doped with silver

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Abstract

The water-soluble Ag+-doped ZnS nanocrystals surface capped with cysteine (expressed as ZnS:Ag/Cys) were synthesized in aqueous solution by using l-cysteine as surface modifier. The crystal structure, size, shape, component, and spectral properties of ZnS:Ag/Cys nanocrystals were characterized by X-ray power diffraction, transmission electron microscope, energy dispersive X-ray analysis, inductively coupled plasma atomic emission spectrometry, infrared spectrum, UV–Vis absorption spectrum, and photoluminescence spectrum. The results show that the spherical ZnS:Ag/Cys nanocrystals with an average diameter of 2.6 nm have good fluorescent characteristics, their fluorescence intensity is enhanced greatly after doped with Ag+. And the sulfur atoms in cysteine molecules are coordinated with metal ions on the surface of the nanocrystals, the cysteine modified on the surface of ZnS:Ag/Cys nanocrystals renders the nanocrystals water soluble and biocompatible. The ZnS:Ag/Cys nanocrystals have potential applications in molecular assembly and biological fluorescence analysis.

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Acknowledgements

This project is financially supported by the Nature Science Foundation of Fujian Province of China (2009J01022), and the Science Foundation of Department of Education of Fujian Province of China (JB07075).

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Authors and Affiliations

  1. College of Chemistry and Material Science, Fujian Normal University, Fuzhou, 350007, Fujian, People’s Republic of China

    Fenghua Huang, Yaling Lan & Peifeng Chen

  2. Key Laboratory of Polymer Materials of Fujian Province, Fuzhou, 350007, Fujian, People’s Republic of China

    Fenghua Huang

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  1. Fenghua Huang
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  2. Yaling Lan
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  3. Peifeng Chen
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Correspondence to Fenghua Huang.

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Huang, F., Lan, Y. & Chen, P. Synthesis and characterization of water-soluble l-cysteine-modified ZnS nanocrystals doped with silver. J Mater Sci 46, 5732–5736 (2011). https://doi.org/10.1007/s10853-011-5527-3

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  • DOI: https://doi.org/10.1007/s10853-011-5527-3

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