4.7 Article

Hydrothermal synthesis of fluorescent carbon dots from gardenia fruit for sensitive on-off-on detection of Hg2+ and cysteine

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.118598

关键词

Carbon dots; Quantum yield; On-off-on; Mercury ion; Cysteine

资金

  1. National Natural Science Foundation of China [21873026, 21573058, U1504212]

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Nitrogen and sulfur co-doped carbon dots (N/S-CDs) were prepared by a simple hydrothermalmethod using gardenia fruit as precursor. The N/S-CDs are nearly spherical particles with a size of 2.1 nm and possess excellent fluorescence stability in a wide pH range and high NaCl concentrations, as well as under UV light irradiation. The absolute quantum yield (QY) without any surface modification reaches up to 10.7%. Meanwhile, the N/ S-CDs can be quenched by Hg2+ (turn-off), while the quenched fluorescence can be recovered (turn-on) by introducing cysteine (Cys), with linear ranges of 2-20 mu M forHg(2+)and 0.1-2.0 mu M for Cys. On the basis of the onoff-on sensingmode, the N/S-CDs can be used to detect Hg2+ and Cys. Hence, the N/S-CDswould be a promising sensor in environmental and biological analysis. (c) 2020 Elsevier B.V. All rights reserved.

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