期刊
NANOMATERIALS
卷 12, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/nano12142377
关键词
carbon dots; nitrogen and fluorine-doped; fluorescent sensor; ferric ion; ascorbic acid
类别
资金
- National Natural Science Foundation of China [22108061]
- Scientific Foundation of the Hebei Normal University of Science and Technology [2022YB022]
This study successfully synthesized nitrogen and fluorine co-doped carbon dots (NFCDs) using a rapid and low-cost method. The NFCDs exhibited intense fluorescence and high quantum yield. Additionally, they were applied for the selective detection of Fe3+ and ascorbic acid. Therefore, this research is of great importance for the convenient and rapid detection of Fe3+ and ascorbic acid in environmental samples.
Carbon dots (CDs) have caught enormous attention owing to their distinctive properties, such as their high water solubility, tunable optical properties, and easy surface modification, which can be generally used for the detection of heavy metals and organic pollutants. Herein, nitrogen and fluorine co-doped carbon dots (NFCDs) were designed via a rapid, low-cost, and one-step microwave-assisted technique using DL-malic acid and levofloxacin. The NFCDs emitted intense green fluorescence under UV lighting, and the optical emission peak at 490 nm was observed upon a 280 nm excitation, with a high quantum yield of 21.03%. Interestingly, the spectral measurements illustrated excitation-independent and concentration-independent single-color fluorescence owing to the presence of nitrogen and fluorine elements in the surface functional groups. Additionally, the NFCDs were applied for the selective detection of Fe3+ and ascorbic acid based on the turn-off mode. The detection limits were determined as 1.03 and 4.22 mu M, respectively. The quenching mechanisms were explored using the static quenching mechanism and the inner filter effect. Therefore, a NFCDs fluorescent probe with single color emission was successfully developed for the convenient and rapid detection of Fe3+ and ascorbic acid in environments.
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