期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 602, 期 -, 页码 689-698出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.06.062
关键词
F N-GQDs; Tunable fluorescence; Optical molecular sensor; Fluorescent ink; Flexible optics
资金
- National Natural Science Foundation of China [11704204, 61604084, 51802337]
- State Key Laboratory of ASIC System [2020KF007]
- K. C. Wong Magna Fund in Ningbo University
- Natural Science Foundation of Ningbo [2017A610104]
Fluorine and nitrogen co-doped graphene quantum dots exhibit unique fluorescence properties, emitting various colors when dispersed in different solvents. Moreover, these quantum dots show a high sensitivity fluorescence response to tetracycline, and can be used as invisible ink and color-adjustable fluorescent ink, suitable for large-area flexible multi-color fluorescent film fabrication.
Fluorine-doped graphene quantum dots have unique chemical bonds and charge distribution, which can bring unexpected properties compared to other common atom-doped graphene quantum dots. In the present work, fluorine and nitrogen co-doped graphene quantum dots (F, N-GQDs) are synthesized from levofloxacin via a simple hydrothermal method. Systematic studies demonstrate that F, N-GQDs can emit various fluorescence with the wavelength ranging from blue to green by dispersing F, N-GQDs into different solvents. Moreover, multi-color fluorescence is available by simply changing the concentration of F, N-GQDs. In addition to these unique characteristics, F, N-GQDs also exhibit a sensitive fluorescence response to tetracycline with an ultralow detection limit of 77 nM in water. Because of high photostability and high quantum yield, the F, N-GQDs are exploited as a unique invisible ink, which is printable and writable on paper. Meanwhile, based on the solvatochromism of F, N-GQDs, we realized the color adjustable fluorescent ink. Finally, large-area flexible multi-color fluorescent films are realized. Our synthesized F, N-GQDs, with tunable fluorescence in wavelength and intensity, have numerous opportu-nities for optical molecular sensors, information security, flexible optics, and others. (c) 2021 Elsevier Inc. All rights reserved.
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