Carbon Quantum Dots: The Role of Surface Functional Groups and Proposed Mechanisms for Metal Ion Sensing

Shabbir, Hasan; Csapó, Edit; Wojnicki, Marek

doi:10.3390/inorganics11060262

Cited by 51 publications

(13 citation statements)

References 127 publications

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“…Thus, G-CDs are structurally optimized for enhanced UVC shielding. [58,59] These results therefore assure us that our CDs have the potential for use in cosmetics.…”

Section: Uv Protectionsupporting

confidence: 57%

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Nuntahirun,

Hanchaina,

Ratchatacharoensak

et al. 2023

ChemistrySelect

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The exhaustion of the ozone layer in the atmosphere has caused an escalation of dangerous UV radiation penetrating the earth's surface. Reactive oxygen species generated under UV exposure through photocatalytic reactions can lead to severe skin health risks, such as skin cancer and premature aging. Although chemical sunscreens are widely used for protection against UV radiation, their long‐term use poses safety concerns and causes environmental damage. In this regard, we have developed carbon dots (CDs) with excellent UV absorption along with extraordinary antioxidant activity, photostability, and biocompatibility from green tea as the main precursor and alpha‐hydroxy acids (AHA) as the co‐precursors, including gluconic acid (GA), citric acid (CA), and tartaric acid (TA). All CDs have a strong UV absorption, especially in the UVB and UVC regions, with G‐CDs having the highest UV absorption. The G‐CDs also have the highest antioxidant activity, which is also higher than that of their parent green tea, AHAs, and ascorbic acid, a well‐known antioxidant. The photostability and cell viability of the G‐CDs were also excellent. The potential of G‐CDs as multifunctional materials makes them a promising candidate for cosmetic applications, particularly for their ability to absorb UV radiation with exceptionally high antioxidant activity, photostability, and biocompatibility.

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“…Thus, G-CDs are structurally optimized for enhanced UVC shielding. [58,59] These results therefore assure us that our CDs have the potential for use in cosmetics.…”

Section: Uv Protectionsupporting

confidence: 57%

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Nuntahirun,

Hanchaina,

Ratchatacharoensak

et al. 2023

ChemistrySelect

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“…This indicates the radiative recombination nature of excitations in our samples. Since in most carbon nanomaterials, the surface states with functional groups are disordered and mainly depend on synthesis and post-treatment conditions, the difference in τ ave can be explained not only by the presence of various functional groups on the surface of CNPs but also by a higher degree of purification [57,[79][80][81].…”

Section: Resultsmentioning

confidence: 99%

Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component

Chernyakova,

Matulaitienė,

Charkova

et al. 2024

J. Phys. Mater.

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Alumina/carbon composites are modern nanomaterials used as adsorbents, catalysts, catalyst supports, supercapacitors, and electrode materials for fuel cells. Among other methods, aluminum anodizing is fairly fast and inexpensive for producing anodic alumina/carbon composites with controllable properties. In the present study, the morphology and composition of carbon-enriched anodic alumina films were obtained during aluminum anodic oxidation in formic acid with ammonium heptamolybdate (C content is ca. 5.0 mass%) or oxalic acid (C content 3.4 mass%) additives. The anodic alumina films have a wide blue fluorescence in the 400–650 nm wavelength range with a maximum at ca. 490 nm. The fluorescence decay is nonexponential and has an average lifetime of 1.54 and 1.59 ns for ammonium heptamolybdate and oxalic acid additives, respectively. As samples obtained in sulfuric acid (i.e., without carbon) do not possess detectable fluorescence in the 400–650 nm wavelength range, it was concluded that carbon-containing inclusions are responsible for the fluorescence properties of the films. The initial samples were dissolved in the hot aqueous HCl solution and then dialyzed to extract the carbon-containing component. It was shown that the solutions contain nanoparticles of amorphous carbon with a 20–25 nm diameter. Carbon nanoparticles also exhibit an excitation-dependent emission behavior at 280–450 nm excitation wavelengths with average lifetimes of 7.25–8.04 ns, depending on the composition of the initial film. Carbon nanoparticle fluorescence is caused by the core of CNPs and various emission centers on their surface, such as carbonyl, carboxyl, and hydroxyl groups. As CNPs could be exceptional candidates for detection technologies, the biocompatibility assays were performed with living COS-7 mammalian cells, showing a minimal negative impact on the living cells.

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“…The IFE, a nonradiative energy phenomenon, arises from the absorption of excited-emitted light by fluorophores or chromophores present within the system. 48,49 The relationship between Fe 3+ ion concentration and the relative fluorescence intensity ( F / F 0 ) was further studied (Fig. 6b), where F 0 and F represent the fluorescence intensities of LCDs in the absence and presence of Fe 3+ ions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Green one-step synthesis of mushroom-derived carbon dots as fluorescent sensors for Fe³⁺ detection

Klongklaw,

Phiromkaew,

Kiatsuksri

et al. 2023

RSC Adv.

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Carbon Quantum Dots: The Role of Surface Functional Groups and Proposed Mechanisms for Metal Ion Sensing

Cited by 51 publications

References 127 publications

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component

Green one-step synthesis of mushroom-derived carbon dots as fluorescent sensors for Fe³⁺ detection

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Carbon Quantum Dots: The Role of Surface Functional Groups and Proposed Mechanisms for Metal Ion Sensing

Cited by 51 publications

References 127 publications

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component

Green one-step synthesis of mushroom-derived carbon dots as fluorescent sensors for Fe3+ detection

Contact Info

Product

Resources

About

Green one-step synthesis of mushroom-derived carbon dots as fluorescent sensors for Fe³⁺ detection