Journal
CARBON
Volume 162, Issue -, Pages 234-244Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.02.048
Keywords
B-doped carbon quantum dot; Fluorescent sensing; Catechol; Glutathione; Sensitivity
Funding
- National Natural Science Foundation of China [51771121, 51572173, 51602197, 51702212]
- Shanghai Municipal Education Commission [2019-01-07-00-07-E00015]
- Shanghai Academic/Technology Research Leader Program [19XD1422900]
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A signal-off-on probe of B-doped carbon quantum dot (B-CQD) is developed for ultrasensitive detection of catechol (CC) by fluorescence quenching and glutathione (GSH) by fluorescence recovering without any auxiliary of biomolecules or labeled materials. In this sensing system, the B-CQDs with a high quantum yield of 42% are prepared via a facile hydrothermal method with precursors of citric acid as C source and sodium tetraphenylborate as B source. The microstructure and fluorescence stability of the B-CQDs are investigated. Under the optimum conditions, the B-CQDs are highly sensitive for detecting CC with a linear range of 1-50 nM and a detection limit of 0.25 nM under a typical signal-to-noise ratio of 3 to 1 (S/N = 3), and for sensing GSH with a linear range of 2-100 nM and a detection limit of 0.5 nM (S/N = 3). Meanwhile, the developed B-CQDs show a good selectivity for sensing CC and GSH under high concentrations of interfering substances, such as biological thiols and amino acids. The B-CQDs are successfully applied to determination of CC in river water and GSH in human serum, where the recoveries are 103.3%-106.0% and 99.8%-106.3% for CC and GSH sensing, respectively. The signal-off-on mechanisms of the B-CQDs sensor are discussed. (c) 2020 Elsevier Ltd. All rights reserved.
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