Strong fluorescence quenching of carbon dots by mercury(II) ions: Ground-state electron transfer and diminished oscillator strength

Dai, Dejian; Zhang, Chengyu; Thuy, Nguyen Thi Dieu; Zhao, Guo; Lu, Wei; Fan, Jiyang

doi:10.1016/j.diamond.2022.109076

Cited by 6 publications

(1 citation statement)

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“…The peaks at 1771 cm −1 and 1670 cm −1 arose from the stretching vibration of C=O. According the previous reports, the absorption peaks of C=O in carboxylic acid group and C(=O)NH 2 were at 1760-1690 and 1690-1630 cm −1 , indicating the presence of -COOH and C(=O)NH 2 in the N-CDs possibly [30][31][32]. The peaks at 1543 and 1390 cm −1 were assigned to the vibration of N-H and C-N.…”

Section: Characterization Of N-cdssupporting

confidence: 62%

N-doped carbon dots as the multifunctional fluorescent probe for mercury ion, glutathione and pH detection

Chen¹,

Hao²,

Li³

et al. 2023

Nanotechnology

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Recently, carbon dots (CDs) have exhibited promising applications in the fluorescence detection of various ions and biomolecules. This work synthesized a new type of nitrogen-doped CDs (N-CDs), characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR), UV-vis absorption spectra, and fluorescence spectra. The results show that the spherical and uniform N-CDs (quantum yield: 60.2%) have remarkable fluorescence properties and photostability, which makes N-CDs can be utilized as an "on-off-on" sensor for Hg2+ and glutathione (GSH). In addition, the pH-sensitive behavior of N-CDs makes it also applicable to H+ detection under acid conditions (pKa = 3.53). The linear range of the "turn-off" sensor detecting Hg2+ was 0 - 50 μM, with a 0.014 μM limit of detection (LOD). GSH was detected by the fluorescence "turn-on" method with a linear range of 0 - 60 μM and a LOD of 0.125 μM. The outstanding performance of N-CDs makes it potential applications in ecological pollution and biomolecule visualization monitoring.

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Section: Characterization Of N-cdssupporting

confidence: 62%