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  • Picomolar reversible Hg(II) solid-state sensor based on carbon dots in double heterostructure colloidal photonic crystals

    Author(s)
    Eftekhari, Ehsan
    Wang, Wentai
    Li, Xiang
    Nikhil, A
    Wu, Zhiqing
    Klein, Robin
    Cole, Ivan S
    Li, Qin
    Griffith University Author(s)
    Li, Qin
    Eftekhari, Ehsan
    Li, Xiang
    Klein, Robin
    Wu, Zhiqing
    Cole, Ivan
    Aravindakshan, Nikhil
    Wang, Wentai
    Year published
    2017
    Metadata
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    Abstract
    Mercury contamination in water is a persistent issue due to both natural geological and anthropogenic activities. Portable, facile and affordable sensors for detection and sensing different species of mercuries are highly desirable. We report a highly effective fluorescent, solid state sensor with high sensitivity, good selectivity and excellent reversibility for Hg(II) ion. Hg(II)-responsive carbon dots immobilised polystyrene spheres were fabricated as a middle layer in double heterostructure colloidal photonic crystal film. Significant fluorescence enhancement was achieved due to doubly resonant of the modes of photonic ...
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    Mercury contamination in water is a persistent issue due to both natural geological and anthropogenic activities. Portable, facile and affordable sensors for detection and sensing different species of mercuries are highly desirable. We report a highly effective fluorescent, solid state sensor with high sensitivity, good selectivity and excellent reversibility for Hg(II) ion. Hg(II)-responsive carbon dots immobilised polystyrene spheres were fabricated as a middle layer in double heterostructure colloidal photonic crystal film. Significant fluorescence enhancement was achieved due to doubly resonant of the modes of photonic crystals and multi beam interface inside the double heterostructure film. The amplified fluorescence enhances the sensitivity of detection, achieving a detection limit of 91 pM for Hg(II) ion, even 17 times lower than that of carbon dots solution probe. The polystyrene-based film sensor is negligibly responsive to other metal ions and can easily be recovered by rinsing with cysteine.
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    Journal Title
    Sensors and Actuators B: Chemical
    Volume
    240
    DOI
    https://doi.org/10.1016/j.snb.2016.08.154
    Subject
    Nanotechnology not elsewhere classified
    Optical Physics
    Analytical Chemistry
    Materials Engineering
    Publication URI
    http://hdl.handle.net/10072/337799
    Collection
    • Journal articles

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