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The on–off-on Fluorescence Sensor of Hollow Carbon Dots for Detecting Hg2+ and Ascorbic Acid

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Abstract

Carbon dots (CDs) have excellent fluorescence properties and can be used in many research fields. In this paper, carbon dots were prepared by microwave-assisted pyrolysis of citric acid and urea, characterized by transmission electron microscope (TEM), X-ray diffractometer (XRD), 13C-NMR spectrum, zeta potential, Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible (UV–vis) absorption and fluorescence spectra, and detected the Hg2+ and ascorbic acid (AA) sequentially. It showed that carbon dots were hollow, spherical particles and less than 10 nm, photoluminescence quantum yield of carbon dots was about 15%. The CDs were selective and sensitive to Hg2+ and AA based on the “on–off-on” fluorescence behavior. The detection limits of CDs for Hg2+ and AA were 0.138 μM and 0.212 μM, respectively. Fluorescence response mechanism of CDs was also discussed.

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Funding

This work is funded by the National Natural Science Foundation of China (31201305), the Natural Science Foundation of Hebei Province (B2019205054, B2019205108, B2021205001), the Teaching Reform Project of Hebei Normal University (2021XJJG047), and the Foundation of Hebei Normal University (L2020B07).

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  1. Yunping Hao and Ronghui Li are equally contributed to this study.

Authors and Affiliations

  1. College of Chemistry and Material Science, Hebei Key Laboratory of Organic Functional Molecules, Hebei Normal University, Shijiazhuang, 050024, China

    Yunping Hao, Ronghui Li, Yanxu Liu, Xuhong Zhang, Lina Geng & Shenna Chen

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  1. Yunping Hao
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  2. Ronghui Li
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Contributions

All authors contributed to the study conception and design. Material preparation and characterization were carried out by Yunping Hao, the fluorescence sensitivity of the production was tested by Ronghui Li. data collection and analyses were performed by Yanxu Liu and Xuhong Zhang. The first draft of the manuscript was written by Lina Geng, and the check of the manuscript was done by Shenna Chen. All authors read and approved the final manuscript.

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Hao, Y., Li, R., Liu, Y. et al. The on–off-on Fluorescence Sensor of Hollow Carbon Dots for Detecting Hg2+ and Ascorbic Acid. J Fluoresc 33, 459–469 (2023). https://doi.org/10.1007/s10895-022-03057-3

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