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  • Title: "On-off-on" detection of Fe3+ and F-, biological imaging, and its logic gate operation based on excitation-independent blue-fluorescent carbon dots.
    Author: Li L, Shi L, Jia J, Jiao Y, Gao Y, Liu Y, Dong C, Shuang S.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2020 Feb 15; 227():117716. PubMed ID: 31707023.
    Abstract:
    A fluorescent nanoprobe based on carbon dots (CDs) has been facilely synthesized by a one-step hydrothermal pyrolysis of salicylic acid and utilized for the sequential detection of Fe3+ and F- in vitro. The fluorescence of CDs can be extinguished dramatically by Fe3+ based on static quenching and subsequently recovery upon addition of F- due to the formation of stabler FeF3. The probe exhibits high selectivity and sensitivity toward Fe3+ and F- with a good linearity in the range of 10-300 μM and 0.1-200 μM, respectively, and a low detection limit of 52 nM and 8.5 nM, respectively. More importantly, as-prepared CDs with exceedingly fluorescence stability, negligible toxicity and superior biocompatibility have been expanded for detection Fe3+ and F- in living cell and Escherichia coli. Furthermore, an "AND" logic gate based on as-obtained CDs has been constructed.
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