Journal
ANALYST
Volume 146, Issue 17, Pages 5357-5361Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1an01212f
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Funding
- National Natural Science Foundation of China [91843301]
- Applied Basic Research Project of Shanxi Province, China [201901D111038]
- Shanxi Province Hundred Talents Project
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Nitrogen doped carbon dots (N-CDs) were successfully synthesized and exhibited high selectivity and sensitivity in detecting curcumin. N-CDs not only have a wide linear range and low detection limit, but also emit signals through visible color change.
Nitrogen doped carbon dots (N-CDs) were synthesized by a one-step hydrothermal method with dopamine and ethylenediamine. The as-prepared N-CDs were characterized via transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), fluorescence spectrophotometer, UV-Vis spectrophotometry and Fourier transform infrared spectroscopy (FTIR). The average particle dimension of the as-prepared N-CDs was 2.68 nm, and the best excitation and emission wavelengths were 405 nm and 535 nm, separately. N-CDs exhibits excellent selectivity and sensitivity to detect the curcumin (Cur), attaining a wider linear range of 97.5 nM-67.9 mu M and a limit of detection (LOD) of as low as 94 nM. Interestingly, N-CDs can also give responsive signals of a visible colour change (yellow to red). Moreover, a novel fluorescent/colorimetric dual-mode method has been successfully employed for the determination of Cur in real samples with good recoveries (94%-110%) and precision (RSD = 0.3-2.9%).
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