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Fabrication of Carbon Dots for Sequential On-off-on Determination of Fe3+ and S2- in Solid-Phase Sensing and Anti-Counterfeit Printing

Analytical and bioanalytical chemistry/Analytical & bioanalytical chemistry(2021)

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摘要
Glutathione and 2-aminopyridine are used as carbon sources to prepare carbon dots (CDs) by a one-step hydrothermal reaction. The results show that the average particle diameter of CDs is 8.64 nm with uniform size distribution and the fluorescence quantum yield is 13.62%. We further demonstrate that novel CDs possess highly selective sensing of Fe3+ from 0.2 to 200 mu M with a low detection limit (0.194 mu M). Meanwhile, the fluorescence of CDs can be repeated many times by the addition of S2-. Moreover, the CDs are used for biological imaging of living cells with well cell penetrability and low toxicity. Furthermore, it is successfully applied for anti-counterfeiting and information encryption. More interestingly, it can be doped with hydrogel and filter paper to prepare solid-phase sensors exhibiting high sensitivity and fast response, demonstrating their tremendous potential for the simple, rapid, and low-cost monitoring of Fe3+ and S2-.
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关键词
Carbon dots,Fe3+,Reversible detection,Solid-phase sensors,Anti-counterfeiting ink
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