AI Article Synopsis
- Nitrogen and sulfur co-doped carbon dots (N/S-CDs) are created using gardenia fruit through a simple hydrothermal process, resulting in nearly spherical particles about 2.1 nm in size.
- These N/S-CDs show outstanding fluorescence stability across various pH levels and sodium chloride concentrations, with a notable quantum yield of 10.7%.
- They can detect mercury by turning off their fluorescence and can be restored by adding cysteine, making them a practical sensor for environmental and biological applications.
Article Abstract
Nitrogen and sulfur co-doped carbon dots (N/S-CDs) were prepared by a simple hydrothermal method using gardenia fruit as precursor. The N/S-CDs are nearly spherical particles with a size of 2.1 nm and possess excellent fluorescence stability in a wide pH range and high NaCl concentrations, as well as under UV light irradiation. The absolute quantum yield (QY) without any surface modification reaches up to 10.7%. Meanwhile, the N/S-CDs can be quenched by Hg (turn-off), while the quenched fluorescence can be recovered (turn-on) by introducing cysteine (Cys), with linear ranges of 2-20 μM for Hgand 0.1-2.0 μM for Cys. On the basis of the on-off-on sensing mode, the N/S-CDs can be used to detect Hg and Cys. Hence, the N/S-CDs would be a promising sensor in environmental and biological analysis.
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| http://dx.doi.org/10.1016/j.saa.2020.118598 | DOI Listing |
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