Carbon dots prepared from citric acid and urea as fluorescent probes for hypochlorite and peroxynitrite

Simões, Eliana F. C.; Leitão, João M.M.; Silva, Joaquim C. G. Esteves da

doi:10.1007/s00604-016-1807-6

Cited by 122 publications

(35 citation statements)

References 39 publications

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“…Carbon dots (CDs) are a kind of quasi-spherical particles with a diameter of less than 10 nm [1][2][3][4]. CDs possess u n i q u e o p t i c a l p r o p e r t i e s s u c h a s t u n a b l e photoluminescence (PL) and excitation dependent multicolor emission [5][6][7]. These properties result from the quantum confinement effect or conjugated π-domains [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The quenching of the fluorescence of carbon dots: A review on mechanisms and applications

et al. 2017

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Carbon dots (CDs) possess unique optical properties such as tunable photoluminescence (PL) and excitation dependent multicolor emission. The quenching and recovery of the fluorescence of CDs can be utilized for detecting analytes. The PL mechanisms of CDs have been discussed in previous articles, but the quenching mechanisms of CDs have not been summarized so far. Quenching mechanisms include static quenching, dynamic quenching, Förster resonance energy transfer (FRET), photoinduced electron transfer (PET), surface energy transfer (SET), Dexter energy transfer (DET) and inner filter effect (IFE). Following an introduction, the review (with 88 refs.) first summarizes the various kinds of quenching mechanisms of CDs (including static quenching, dynamic quenching, FRET, PET and IFE), the principles of these quenching mechanisms, and the methods of distinguishing these quenching mechanisms. This is followed by an overview on applications of the various quenching mechanisms in detection and imaging.

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Section: Introductionmentioning

confidence: 99%

The quenching of the fluorescence of carbon dots: A review on mechanisms and applications

et al. 2017

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“…With the increase of ClO − , the emission intensity of CCO at 530 nm was continuously and regularly enhanced. The fluorescence enhancement mechanism may be due to the redox reaction of the surface lactone groups of CCO . A more detailed information is found that the emission response of probe CCO to ClO − had a good linear relationship (R 2 =0.996) in the range of 0–8.5 μ M (Figure S4) .…”

Section: Resultsmentioning

confidence: 92%

A Fluorescent Probe with a Significant Selective Turn‐On Response for HClO Detection and Bioimaging in Living Cells

et al. 2019

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Hypochlorous/Hypochlorite(HClO/ClO À ) plays an important biochemistry roles in normal operation of the life system. Herein, a fluorescent probe 7-chloro-3-((E)-3-(4-(dimethylamino)phenyl)acryloyl)-2H-chromen-2-one (CCO) was rationally designed and synthesized via aldehyde ketone condensation reaction to detect ClO À in Tris-HCl (pH = 7.2, 60% DMF) solution. Probe CCO was cleaved conceivably in the coumarin lactone ring by an oxidation reaction with ClO À and emitted intensive bright yellow fluorescence. The sensing mechanism was further confirmed by ESI-MS and DFT calculation. The fluorescence emission of probe CCO triggered by ClO À was obviously enhanced within 20 s. The limit of detection of probe CCO was calculated as low as 2.6 nM. Furthermore, probe CCO can be given as an effective and outstanding fluorescent exogenous ClO À probe in living HEK293T cells for microscopic cell imaging.

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“…The quantum yield (QY) of the product is in general in the range of 5-15%, which is quite low in comparison to C-dots obtained with other precursors [7]. A better QY is achieved by adding a nitrogen-source as a precursor, such as urea [8,9]. In a recent work [10], we have reported the high fluorescence tunability C-dots synthesized by carbonization of citric acid and urea.…”

Section: Introductionmentioning

confidence: 97%

Reversible Aggregation of Molecular-Like Fluorophores Driven by Extreme pH in Carbon Dots

et al. 2020

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The origin of carbon-dots (C‑dots) fluorescence and its correlation with the dots structure still lack a comprehensive model. In particular, the core-shell model does not always fit with the experimental results, which, in some cases, suggest a molecular origin of the fluorescence. To gain a better insight, we have studied the response of molecular-like fluorophores contained in the C‑dots at extreme pH conditions. Citric acid and urea have been employed to synthesize blue and green‑emitting C‑dots. They show a different emission as a function of the pH of the dispersing media. The photoluminescence has been attributed to molecular-like fluorophores: citrazinic acid and 4‑hydroxy‑1H‑pyrrolo[3,4‑c]‑pyridine‑1,3,6‑(2H,5H)-trione. 3D and time‑resolved photoluminescence, ultraviolet–visible (UV–vis) spectroscopy, and dynamic light scattering have been used to determine the aggregation state, quantum yield and emission properties of the C-dots. The dependence of the C-dots blue and green components on the chemical environment indicates that the origin of fluorescence is due to molecular-like fluorophores.

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Carbon dots prepared from citric acid and urea as fluorescent probes for hypochlorite and peroxynitrite

Cited by 122 publications

References 39 publications

The quenching of the fluorescence of carbon dots: A review on mechanisms and applications

The quenching of the fluorescence of carbon dots: A review on mechanisms and applications

A Fluorescent Probe with a Significant Selective Turn‐On Response for HClO Detection and Bioimaging in Living Cells

Reversible Aggregation of Molecular-Like Fluorophores Driven by Extreme pH in Carbon Dots

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