Synthesis of multicolor photoluminescent carbon quantum dots functionalized with hydrocarbons of different chain lengths

Vieira, Kayo O.; Bettini, Jefferson; Oliveira, Luiz Fernando Cappa de; Ferrari, Jefferson Luis; Schiavon, Marco A.

doi:10.1016/s1872-5805(17)60126-4

Cited by 32 publications

(9 citation statements)

References 43 publications

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“…Sodium fluoride as a fluorine source and F atoms were incorporated into the honeycomb structure of carbon atoms [29]. Ultrasonic spray coating is an efficient method that can be used to produce fine droplets via ultrasonic vibration and deposit uniform and thin coating layers on various substrates [30]. In this study, an NF-CQD dispersion was finely coated on a Ni foam substrate via ultrasonic spray coating.…”

Section: Resultsmentioning

confidence: 99%

N- and F-Co-Doped Carbon Quantum Dots Coated on a Ni Foam Substrate as Current Collector for Highly Stable Li-Air Batteries

Sung

Ahn

2023

International Journal of Energy Research

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Because of their high theoretical density, Li-air batteries (LABs) are expected to be critical components of future energy storage devices. However, the commercial use of LABs is limited by their low charge-discharge efficiency, high overpotential, and low cyclic stability. Therefore, to improve the cyclic stability of LABs, we manufactured N- and F-co-doped carbon quantum dots (NF-CQDs), thinly coated them on the surface of a Ni foam current collector via ultrasonic spray coating, and used the as-fabricated NF-CQD/Ni as the current collector of an LAB cathode. The NF-CQD/Ni-based cathode maintained remarkable cycling stability over 42 cycles (with a limited capacity was 1000 mAh/g) and exhibited a superior specific discharge capacity of approximately 5121.91 mAh/g (at 100 mA/g). NF-CQD/Ni-based cathode exhibits superior electrochemical properties, including its high cycling stability and high discharge capacity, primarily contributed by the NF-CQD coating layer, which prevented the oxidation of the Ni foam substrate and increased the electrical conductivity and electrocatalytic activity of the cathode. Therefore, NF-CQD/Ni can serve as an excellent current collector for LAB cathodes.

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Section: Resultsmentioning

confidence: 99%

N- and F-Co-Doped Carbon Quantum Dots Coated on a Ni Foam Substrate as Current Collector for Highly Stable Li-Air Batteries

Sung

Ahn

2023

International Journal of Energy Research

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“…In this regard, the appreciable increase observed for 15 h of synthesis was consistent In addition, both samples showed a peak at 350 nm, which was more evident in the N-CQDs-40 min sample and could be assigned to the n-π* transition of −C=O, -C-N-, or −C-OH bonds in the sp 3 -hybridized domains. This transition could be related to hydroxyl (-OH), carboxylic (−COOH), or amine (−NH 2 ) groups on the surface of CQDs [47][48][49][50].…”

Section: Optical Properties Of N-cqds-based Nanomaterialsmentioning

confidence: 99%

Top-Down N-Doped Carbon Quantum Dots for Multiple Purposes: Heavy Metal Detection and Intracellular Fluorescence

et al. 2021

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In the present study, we successfully synthesized N-doped carbon quantum dots (N-CQDs) using a top-down approach, i.e., hydroxyl radical opening of fullerene with hydrogen peroxide, in basic ambient using ammonia for two different reaction times. The ensuing characterization via dynamic light scattering, SEM, and IR spectroscopy revealed a size control that was dependent on the reaction time, as well as a more pronounced -NH2 functionalization. The N-CQDs were probed for metal ion detection in aqueous solutions and during bioimaging and displayed a Cr3+ and Cu2+ selectivity shift at a higher degree of -NH2 functionalization, as well as HEK-293 cell nuclei marking.

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“…The morphology of CQDs is typically quasi‐spherical ( Figure ), and they can be crystalline or amorphous depending on the precursors and synthetic routes used. [ 6–8 ] CQDs consist of an sp 2 hybridized carbon core and shell layers are either occupied by hydrogen atoms or functional groups such as NH 2 , OH, COOH, etc. The CQDs as well as graphene quantum dots (GQDs) can have edges aligned in the arm‐chair or zig‐zag fashion ( Figure ).…”

Section: Introductionmentioning

confidence: 99%

Doping and Surface Modification of Carbon Quantum Dots for Enhanced Functionalities and Related Applications

John

Nair

2021

Part & Part Syst Charact

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Carbon quantum dots (CQDs) are a unique class of 0D nanomaterials, featured by a graphitic core and shell layers saturated with hydrogen atoms and functional groups. CQDs are prepared through top‐down and bottom‐up strategies from natural and synthetic precursors. CQDs can be modified through chemical (e.g., surface functionalization/passivation, doping, etc.) and physical (e.g., core–shell architecture, composite material blending, etc.) strategies to control their properties. This review highlights the effect of such modifications on the photophysical properties of CQDs, such as photoluminescence (PL), absorbance, and relaxivity. The dependence of PL upon the size, orientation at the edges, surface and edge functionalization, doping, excitation wavelength, concentration, pH, aggregate formation, etc., are summarized along with the supporting theoretical evidence available in the literature. Also, this review outlines the recent advancements, and future prospective of optical (e.g., sensing, bioimaging, and fluorescent ink) and catalytic applications (e.g., photocatalysis and electrocatalysis) of CQDs enhanced through physical and chemical modifications of their structure and composition.

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Synthesis of multicolor photoluminescent carbon quantum dots functionalized with hydrocarbons of different chain lengths

Cited by 32 publications

References 43 publications

N- and F-Co-Doped Carbon Quantum Dots Coated on a Ni Foam Substrate as Current Collector for Highly Stable Li-Air Batteries

N- and F-Co-Doped Carbon Quantum Dots Coated on a Ni Foam Substrate as Current Collector for Highly Stable Li-Air Batteries

Top-Down N-Doped Carbon Quantum Dots for Multiple Purposes: Heavy Metal Detection and Intracellular Fluorescence

Doping and Surface Modification of Carbon Quantum Dots for Enhanced Functionalities and Related Applications

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