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  • An Aqueous Route Synthesis of Transition-Metal-Ions-Doped Quantum Dots by Bimetallic Cluster Building Blocks

    Author(s)
    Zhang, Hui
    Yu, Junlai
    Sun, Caixia
    Xu, Wenhao
    Chen, Jie
    Sun, Hui
    Zong, Chen
    Liu, Zhen
    Tang, Yun
    Zhao, Dongyuan
    Griffith University Author(s)
    Zhao, Dongyuan
    Year published
    2020
    Metadata
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    Abstract
    Water-soluble doped quantum dots have unique photophysical properties and functionalities as optical labels for bioimaging and chemo-/biosensing. However, doping in quantum dots is not easy due to the dopant-ion size mismatch and "self-purification"effect. Here, we demonstrate a successful preparation of Mn-, Cu-, and Ni-doped CdS quantum dots with bimetallic clusters instead of ions as building blocks under mild aqueous conditions up to gram scale. The representative Mn-doped quantum dots have uniform size, about 3.2 ± 0.5 nm, and emit at 620 nm. The doping concentration can be adjusted in the range 6.4%-25.7%. On the premise ...
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    Water-soluble doped quantum dots have unique photophysical properties and functionalities as optical labels for bioimaging and chemo-/biosensing. However, doping in quantum dots is not easy due to the dopant-ion size mismatch and "self-purification"effect. Here, we demonstrate a successful preparation of Mn-, Cu-, and Ni-doped CdS quantum dots with bimetallic clusters instead of ions as building blocks under mild aqueous conditions up to gram scale. The representative Mn-doped quantum dots have uniform size, about 3.2 ± 0.5 nm, and emit at 620 nm. The doping concentration can be adjusted in the range 6.4%-25.7%. On the premise of good water solubility, they are stable and nontoxic so as to be directly used for cell imaging. Copper and nickel doping have similar results. Because of the close sizes of bimetallic clusters and the low reaction temperature, the challenges posed by dopant size mismatch and ion diffusion are ignored. X-ray absorption fine structure analysis proves that dopants are inside the quantum dots rather than on the surface, indicating that the "self-purification"effect can be effectively overcome. Furthermore, codoped ZnS quantum dots with adjustable emission are achieved, which validates the versatility of our new approach.
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    Journal Title
    Journal of the American Chemical Society
    Volume
    142
    Issue
    38
    DOI
    https://doi.org/10.1021/jacs.0c07274
    Subject
    Chemical sciences
    Science & Technology
    Physical Sciences
    Chemistry, Multidisciplinary
    Chemistry
    COLLOIDAL NANOCRYSTALS
    Publication URI
    http://hdl.handle.net/10072/400476
    Collection
    • Journal articles

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