Journal
INORGANIC CHEMISTRY COMMUNICATIONS
Volume 146, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.inoche.2022.110034
Keywords
Carbon dots; Mustard seeds; Fe3+ions; Fluorescent probes; Quenching mechanism
Categories
Funding
- National Natural Science Foundation of China [11704274, 11705124]
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials [QMNEM1801]
- Emerging Industry Leadership Talent Program of Shanxi Province [2019042]
- Natural Science Foundation of Shanxi Province [201901D111267]
- Key R&D Project of Shanxi Province [201903D321111]
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Carbon dot (CDs) fluorescent probes have gained growing interest due to their non-destructive, non-contact, sensitive, fast, and low-cost characteristics. In this study, CDs were synthesized using mustard seeds as the carbon source through a simple hydrothermal method, achieving a high quantum yield. As a label-free fluorescent probe, CDs were used for the detection of Fe3+ ions in environmental water and human cells. The study also investigated the fluorescence quenching mechanism of CDs caused by Fe3+ ions.
A growing interest has emerged in carbon dot (CDs) fluorescent probes, as they are non-destructive, non-contact, sensitive, fast, and low-cost. However, the low fluorescence quantum yield (QY) and the uncertainty of fluo-rescence quenching mechanism are the main bottlenecks restricting its application. Here, we used mustard seeds as carbon source, CDs were synthesized by a simple hydrothermal method without further surface treatment with the QY reached a value as high as 17.92 % in 468 nm excitation energy. As a label-free fluorescent probe, CDs can be used to sense Fe3+ ions in environmental water and human oral keratinocytes (Hok) cells, with a detection limit of 0.51 mu M and the linear range of 0-75 mu M. Moreover, we have conducted an in-depth study on the mechanism of fluorescence quenching of CDs caused by Fe3+ ions. Our study provides powerful evidences that the mechanism of fluorescence quenching to Fe3+ ions is a synergistic effect of static quenching (SQ) and aggregation-induced effect (AIE), which accompanied by forming a non-fluorescent ground state complex be-tween CDs and Fe3+ ions. This work promises to provide new ideas for the most appropriate detection strategy and design the best performing sensor, allowing their effective application in the sensing field.
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