Facilely synthesised sulphur-doped carbon dots for highly selective determination of picric acid and for biological imaging

Here, yellow fluorescent sulphur-doped carbon dots (S-CDs) with high quantum yield (QY) of ~27.9% were synthesised from m-cresol purple by a fast and low-cost one-step hydrothermal method without other reagents. The surface morphology, functional groups and optical properties of S-CDs were character...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2023-12, Vol.103 (20), p.9209-9223
Main Authors: Xiao, Yanteng, Zhang, Junqiu, Liu, Yaoming, Wang, Yingte, Cheng, Sijie, Zhang, Yong
Format: Article
Language:English
Subjects:
Analytical methods
Biocompatibility
biological imaging
Carbon
Carbon dots
Cresols
Fluorescence
fluorescence determination
Fluorescent indicators
Fourier transforms
Functional groups
Imaging techniques
Infrared radiation
Lakes
Optical properties
Photoelectron spectroscopy
Photoelectrons
Picric acid
Reagents
Sulfur
Sulphur
Sulphur-doped carbon dots
Toxicity
Ultraviolet spectra
X ray photoelectron spectroscopy
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Summary:Here, yellow fluorescent sulphur-doped carbon dots (S-CDs) with high quantum yield (QY) of ~27.9% were synthesised from m-cresol purple by a fast and low-cost one-step hydrothermal method without other reagents. The surface morphology, functional groups and optical properties of S-CDs were characterised by high-resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectrum and ultraviolet visible (UV-vis) absorption. The fluorescence intensity of S-CDs can be specifically and stably quenched by picric acid (PA) through inner filtration effect (IFE). The linearity between fluorescent intensity and PA concentration was used for developing a fluorescent probe with detecting range of 0-259.0 μM and a detection limit as low as 14.6 nM. We developed the method by applying S-CDs to determine PA in lake water with recoveries in the range of 93.0-103.7%, which verified the feasibility of this probe in practical analysis. In addition, due to the low toxicity and good biocompatibility, S-CDs can be applied to biological imaging.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2021.2004589