A review on advancements in carbon quantum dots and their application in photovoltaics

RSC Advances, Journal Year: 2022, Volume and Issue: 12(8), P. 4714 - 4759

Published: Jan. 1, 2022

This review puts forth the in-depth understanding of fundamentals carbon quantum dots(CQDs), recent advancements in field including a thorough discussion on different roles CQDs to enhance performance solar cells and white-LEDs.

Language: Английский

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Two-Step Hydrothermal Preparation of Carbon Dots for Calcium Ion Detection

ACS Applied Materials & Interfaces, Journal Year: 2019, Volume and Issue: 11(47), P. 44566 - 44572

Published: Nov. 4, 2019

It is well known that the calcium ion essential for maintaining life activities in living organisms, and it of great significance to detect intracellular concentration. For detection ions, we developed a new type fluorescent carbon dots (CDs), whose surface was modified by ethylenebis(oxyethylenenitrilo)tetraacetic acid (EGTA) through secondary hydrothermal method. This simple convenient chemical preparation method because all reactions are carried out same autoclave, final product directly EGTA-modified CDs. The CDs exhibit bright blue fluorescence, as concentration increases, fluorescence intensity drops sharply. quenching correlates with ions has good linearity range 15-300 μM limit 0.38 μM. experimental results confirmed static process. Also, cytotoxicity test cellular imaging experiments have shown nontoxic biocompatible.

Language: Английский

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Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(18), P. 11047 - 11136

Published: Sept. 7, 2023

Advances in nanotechnology and nanomaterials have attracted considerable interest play key roles scientific innovations diverse fields. In particular, increased attention has been focused on carbon-based exhibiting extended structures unique properties. Among these materials, zero-dimensional structures, including fullerenes, carbon nano-onions, nanodiamonds, dots, possess excellent bioaffinities superior fluorescence properties that make suitable for application to environmental biological sensing, imaging, therapeutics. This review provides a systematic overview of the classification structural properties, design principles preparation methods, optical sensing applications nanomaterials. Recent interesting breakthroughs sensitive selective imaging heavy metal pollutants, hazardous substances, bioactive molecules as well information encryption, super-resolution photoacoustic phototherapy nanomedicine delivery are main focus this review. Finally, future challenges prospects materials highlighted envisaged. presents comprehensive basis directions designing, developing, applying fascinating fluorescent sensors fabricated based specific requirements numerous research

Language: Английский

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Large scale synthesis of full-color emissive carbon dots from a single carbon source by a solvent-free method

Nano Research, Journal Year: 2021, Volume and Issue: 15(4), P. 3548 - 3555

Published: Oct. 15, 2021

Language: Английский

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Molecular physics of persistent room temperature phosphorescence and long-lived triplet excitons

Applied Physics Reviews, Journal Year: 2022, Volume and Issue: 9(1)

Published: Jan. 18, 2022

Persistent room temperature phosphorescence (pRTP) is important to high-resolution imaging independent of autofluorescence and the scattering excitation light for security applications. Although efficient bright pRTP crucial applications, photophysical processes from triple states heavy-atom-free chromophores have been explained by making many assumptions that are potentially based on incorrect explanations. This often confuses researchers in their efforts control enhance characteristics. paper introduces recent advances our understanding lowest triplet excited state statistical evidence experimental theoretical viewpoints. After introduction two showing persistent RT emissions characteristics emissions, physical parameters relating appropriate techniques measuring explained. For molecularly dispersed heavy-metal-free a solid state, understandings verified correlations optically estimated viewpoints summarized. Using insights obtained chromophores, uncertainties regarding aggregated discussed. highlighting recently developed materials pRTP, potential advantages over previous discussed considering demonstrations emitters. review quantitatively summarizes relationship between molecular backbone guides reader appropriately design with long-lived excitons promising

Language: Английский

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Carbon dots as oxidant-antioxidant nanomaterials, understanding the structure-properties relationship. A critical review

Nano Today, Journal Year: 2023, Volume and Issue: 50, P. 101837 - 101837

Published: March 30, 2023

Carbon dots (C-dots) are a large family of nanomaterials characterized by an intense photoluminescence. The origin the emission is multifaceted and dependent on number factors, including structure, surface, composition. term "carbon dots" quite broad encompasses wide range carbon nanostructures. multiple properties result this variability, which also makes it difficult to establish clear structure-property relationship. Photoluminescence property class that has garnered greatest attention due possibility applications in various fields, biotechnologies, electronics, energy. Another C-dots only lately been recognized their antioxidant activity, i.e., ability act as free radical scavenger. Furthermore, proven certain types function oxidizing agents when exposed visible and/or UV radiation. This dual oxidant-antioxidant nature particularly intriguing closely related C-dot properties. Although many articles have published subject, still needs be understood what relationships regulate responses radicals. review aims provide general overview characteristics scavengers or emitters critical analysis relevant studies. Based intended application oxidants antioxidants, findings can used synthesize with precisely defined functional

Language: Английский

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Preparation of photocatalysts decorated by carbon quantum dots (CQDs) and their applications: A review

Journal of environmental chemical engineering, Journal Year: 2023, Volume and Issue: 11(2), P. 109487 - 109487

Published: Feb. 13, 2023

Language: Английский

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Quantum dots: an overview of synthesis, properties, and applications

Materials Research Express, Journal Year: 2023, Volume and Issue: 10(6), P. 062001 - 062001

Published: May 30, 2023

Abstract Quantum dots (QDs) have sparked great interest due to their unique electronic, optical, and structural properties. In this review, we provide a critical analysis of the latest advances in synthesis, properties, applications QDs. We discuss synthesis techniques, including colloidal hydrothermal highlight how underlying principles these techniques affect resulting properties then delve into wide range QDs, from QDs based color conversion, light-emitting diodes biomedicine quantum-based cryptography spintronics. Finally, identify current challenges future prospects for quantum dot research. By reading readers will gain deeper understanding state-of-the-art research potential development.

Language: Английский

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Carbon Nanodots from an In Silico Perspective

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(16), P. 13709 - 13799

Published: Aug. 10, 2022

Carbon nanodots (CNDs) are the latest and most shining rising stars among photoluminescent (PL) nanomaterials. These carbon-based surface-passivated nanostructures compete with other related PL materials, including traditional semiconductor quantum dots organic dyes, a long list of benefits emerging applications. Advantages CNDs include tunable inherent optical properties high photostability, rich possibilities for surface functionalization doping, dispersibility, low toxicity, viable synthesis (top-down bottom-up) from materials. can be applied to biomedicine imaging sensing, drug-delivery, photodynamic therapy, photocatalysis but also energy harvesting in solar cells as LEDs. More applications reported continuously, making this already research field its own. Understanding requires one go levels electrons, atoms, molecules, at different scales using modern molecular modeling correlate it tightly experiments. This review highlights silico techniques studies, chemistry mesoscale, particular reference carbon nanodots, carbonaceous nanoparticles whose structural photophysical not fully elucidated. The role experimental investigation is presented. Hereby, we hope encourage reader investigate apply virtual obtain further insights needed customize these amazing systems novel prospective

Language: Английский

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Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(44)

Published: March 24, 2023

Abstract Carbon dots (CDs), as emerging carbon nanomaterials, have been regarded promising alternatives for electroluminescent light‐emitting diodes (LEDs) owing to their distinct characteristics, such low toxicity, tuneable photoluminescence, and good photostability. In the last few years, despite remarkable progress achieved in CD‐based LEDs, device performance is still inferior that of well‐developed organic, heavy‐metal‐based QDs, perovskite LEDs. To better exploit LED applications boost performance, this review, a comprehensive overview currently explored CDs presented, focusing on key optical which are closely related structural design from core surface modifications, macroscopic engineering, including embedding matrix or spatial arrangement CDs. The LEDs display lighting based fluorescence, phosphorescence, delayed fluorescence emission also highlighted. Finally, it concluded with discussion regarding challenges plausible prospects field. It hoped review inspires more extensive research new perspective promotes practical multiple directions current future research.

Language: Английский

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