Journal
TALANTA
Volume 194, Issue -, Pages 554-562Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2018.09.114
Keywords
Fluorescence; Carbon dots; Mercury ion; Biothiol
Categories
Funding
- National Natural Science Foundation of China [21475152, 21576296]
- Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety [2018TP1003]
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Nitrogen-doped carbon dots (N-CDs) were prepared by adjusting the ratio of carbon sources (citric acid) and nitrogen sources (ethanolamine). This N-CDs fluorescent probe had been successfully applied to rapidly, sensitively and selectively determine the concentration of mercury ion (Hg2+) with a linear range of 0.1-5.0 M and a limit of detection of 0.019 In this work, it was demonstrated that N-CDs show the fluorescence response toward Hg2+ when the carboxyl groups of citric acid reacts completely with the amino groups of ethanolamine. In addition, the quenched N-CDs/Hg2+ system could be recovered by biothiol, such as cysteine (Cys), homocysteine (Hcy) and glutathione (GSH), exhibiting a sensitive response toward Cys and Hcy over GSH in HEPES buffer. N-CDs could be used as a potential fluorescent bioimaging material due to their low toxicity and good biocompatibility. Furthermore, an IMPLICATION logic gate based on Hg2+ and biothiol was constructed.
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