Recent Advances in Carbon Dots

Chatzimitakos, Theodoros; Stalikas, Constantine D.

doi:10.3390/c5030041

Cited by 8 publications

(11 citation statements)

References 5 publications

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“…14 In spite of the controversy regarding the mechanism of the photoluminescence (PL) of doped CQDs, it is agreed that trap states with different energy levels can be introduced by surface groups, which result in excitation-dependent fluorescence. 25 The sour taste of lemon juice is due to the presence of a high concentration of citric acid. 26 Motivated by these, we synthesized water-soluble highly fluorescent-nitrogen-doped carbon quantum dots (NCQDs) with high quantum yield (QY ∼ 31%) using eco-friendly green hydrothermal synthesis methods utilizing lemon juice as a precursor and ethylenediamine as the co-reagent.…”

Section: ■ Introductionmentioning

confidence: 99%

Fluorescent-Nitrogen-Doped Carbon Quantum Dots Derived from Citrus Lemon Juice: Green Synthesis, Mercury(II) Ion Sensing, and Live Cell Imaging

et al. 2020

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In this study, we report a green and economical hydrothermal synthesis of fluorescent-nitrogen-doped carbon quantum dots (NCQDs) using citrus lemon as a carbon source. The prepared NCQDs possess high water solubility, high ionic stability, resistance to photobleaching, and bright blue color under ultraviolet radiation with a high quantum yield (∼31%). Highresolution transmission electron microscopy (HRTEM) results show that the prepared NCQDs have a narrow size distribution (1−6 nm) with an average particle size of 3 nm. The mercury ion (Hg 2+ ) sensing efficiency of the NCQDs was studied, and the result indicated that the material has high sensitivity, high precision, and good selectivity for Hg 2+ . The limit of detection (LOD) is 5.3 nM and the limit of quantification (LOQ) is 18.3 nM at a 99% confidence level. The cytotoxicity was evaluated using MCF7 cells, and the cell viabilities were determined to be greater than 88% upon the addition of NCQDs over a wide concentration range from 0 to 2 mg/mL. Based on the low cytotoxicity, good biocompatibility, and other revealed interesting merits, we also applied the prepared NCQDs as an effective fluorescent probe for multicolor live cell imaging.

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Section: ■ Introductionmentioning

confidence: 99%

Fluorescent-Nitrogen-Doped Carbon Quantum Dots Derived from Citrus Lemon Juice: Green Synthesis, Mercury(II) Ion Sensing, and Live Cell Imaging

et al. 2020

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“…Carbon dots (CDs), a type of carbon nanomaterial with a size below 10 nm and a quasi-spherical shape, were discovered in 2004 by Xu et al [ 1 ]. Their intriguing properties, such as biocompatibility and fluorescence, have made them important in a variety of fields [ 2 , 3 , 4 , 5 , 6 , 7 ]. They can be synthesized in two ways: bottom-up and top-down.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Purification, and Characterization of Carbon Dots from Non-Activated and Activated Pyrolytic Carbon Black

et al. 2022

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In this work, carbon dots were created from activated and non-activated pyrolytic carbon black obtained from waste tires, which were then chemically oxidized with HNO3. The effects caused to the carbon dot properties were analyzed in detail through characterization techniques such as ion chromatography; UV–visible, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy; ζ potential; transmission electron microscopy (TEM); and spectrofluorometry. The presence of functional groups on the surface of all carbon dots was revealed by UV–visible, FTIR, XPS, and Raman spectra. The higher oxidation degrees of carbon dots from activated precursors compared to those from nonactivated precursors resulted in differences in photoluminescence (PL) properties such as bathochromic shift, lower intensity, and excitation-dependent behavior. The results demonstrate that the use of an activating agent in the recovery of pyrolytic carbon black resulted in carbon dots with different PL properties. In addition, a dialysis methodology is proposed to overcome purification obstacles, finding that 360 h were required to obtain pure carbon dots synthesized by a chemical oxidation method.

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“…Carbon-based nanomaterials such as graphene, graphene oxide, carbon nanotubes, and fullerenes, have recently attracted tremendous interest in analytical chemistry, due to their extraordinary properties [97,98]. As anticipated by their chemical structure, these nanomaterials can interact with hydrogen bonding, π−π stacking, electrostatic forces, van der Waals forces and hydrophobic interactions, resulting in high adsorption efficiency towards the target analytes [99].…”

Section: Carbon-based Materialsmentioning

confidence: 99%

Bioanalytical HPLC Applications of In-Tube Solid Phase Microextraction: A Two-Decade Overview

2020

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In-tube solid phase microextraction is a cutting-edge sample treatment technique offering significant advantages in terms of miniaturization, green character, automation, and preconcentration prior to analysis. During the past years, there has been a considerable increase in the reported publications, as well as in the research groups focusing their activities on this technique. In the present review article, HPLC bioanalytical applications of in-tube SPME are discussed, covering a wide time frame of twenty years of research reports. Instrumental aspects towards the coupling of in-tube SPME and HPLC are also discussed, and detailed information on materials/coatings and applications in biological samples are provided.

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Recent Advances in Carbon Dots

Abstract: It is unequivocally true that in recent years, carbon-based nanomaterials such as graphene, carbon nanotubes, and fullerenes, have attracted tremendous interest and an increasing number of applications have reaped their numerous benefits [...]

Cited by 8 publications

References 5 publications

Fluorescent-Nitrogen-Doped Carbon Quantum Dots Derived from Citrus Lemon Juice: Green Synthesis, Mercury(II) Ion Sensing, and Live Cell Imaging

Fluorescent-Nitrogen-Doped Carbon Quantum Dots Derived from Citrus Lemon Juice: Green Synthesis, Mercury(II) Ion Sensing, and Live Cell Imaging

Synthesis, Purification, and Characterization of Carbon Dots from Non-Activated and Activated Pyrolytic Carbon Black

Bioanalytical HPLC Applications of In-Tube Solid Phase Microextraction: A Two-Decade Overview

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