Photoluminescence mechanism of carbon dots: triggering high-color-purity red fluorescence emission through edge amino protonation

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Nov. 25, 2021

Due to complex structure and surface functionalities, photoluminescence mechanisms of Carbon Dots are unknown, it is challenging synthesize achieve the desired optical properties. Herein, simultaneously exhibiting high-color-purity (FWHM~24 nm) long wavelength one-photon fluorescence emission at 620 nm NIR induced two-photon 630 680 prepared by edge amino protonation treatment. Systematic analysis reveals that 2,3-diaminophenazine changes molecular state Dots, decreases photon transition band gap, triggers red with dramatically narrowed peak width. As oxidation products reactant o-phenylendiamine, emergence as a determiner suggests fluorophore precursor conversion viable determinants luminescence properties Dots. This work shows new way for predicting controlling may guide development tunable broad range applications.

Language: Английский

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Carbon Dots in Bioimaging, Biosensing and Therapeutics: A Comprehensive Review

Small Science, Journal Year: 2022, Volume and Issue: 2(6)

Published: May 8, 2022

Carbon dots (CDs), comprising crystalline graphitized carbon cores and polymer surface groups, are currently attracting a lot of interest in biological fields owing to their fluorescent properties, high photostability, biocompatibility low toxicity. In addition, the easy preparation functionalization CDs stimulate development CDs‐based composite materials with specific functions. Presently, applications growing at remarkable speed, justifying need for up‐to‐date review articles that capture recent progress this blossoming field. review, breakthroughs synthesis, modification, optical toxicology biocatalytic platforms described. Further, research related bioimaging, biosensing, drug delivery, antibacterial, anticancer (photothermal therapy, photodynamic therapy synergistic therapy) antiviral therapies involving discussed detail. Finally, perspective on prospects challenges biomedicine biotechnology is provided.

Language: Английский

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Red Emissive Carbon Dot Superoxide Dismutase Nanozyme for Bioimaging and Ameliorating Acute Lung Injury

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(19)

Published: Jan. 29, 2023

Abstract Harnessing the physiochemical properties and enzymatic activities of nanozymes will provide new insights for disease theranostics. Herein, a novel carbon dot (C‐dot) superoxide dismutase (SOD) nanozyme that exhibits red fluorescence with emission wavelength 683 nm shows high SOD‐like activity >4000 U mg −1 is reported, which presents great potential imaging biodistribution itself in vivo ameliorating acute lung injury. Through surface modifications, mechanism C‐dot SOD revealed to be relied on their functional groups bind radicals, promote electron transfer between C‐dots finally accelerate dismutation radicals. The absolute quantum yield ≈14% endow it bioimaging vitro vivo. Moreover, effectively enters cells, accumulates at mitochondria, protects living cells from oxidative damage by scavenging reactive oxygen species (ROS) reducing levels pro‐inflammatory factors. Importantly, animal experiments demonstrate accumulation injure therapeutic effect toward injury mice. fluorescent management ROS‐related diseases.

Language: Английский

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Chiral carbon dots: synthesis, optical properties, and emerging applications

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: March 27, 2022

Carbon dots are luminescent carbonaceous nanoparticles that can be endowed with chiral properties, making them particularly interesting for biomedical applications due to their low cytotoxicity and facile synthesis. In recent years, synthetic efforts leading carbon other attractive optical properties such as two-photon absorption circularly polarized light emission have flourished. We start this review by introducing examples of molecular chirality its origins providing a summary chiroptical spectroscopy used characterization. Then approaches induce in nanomaterials reviewed. the main part we focus on dots, fabrication techniques bottom-up top-down chemical syntheses, morphology, optical/chiroptical properties. then consider emerging sensing, bioimaging, catalysis, conclude future challenges.

Language: Английский

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Carbon dots: mysterious past, vibrant present, and expansive future

Trends in Chemistry, Journal Year: 2022, Volume and Issue: 5(1), P. 76 - 87

Published: Nov. 10, 2022

Language: Английский

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Aggregation and luminescence in carbonized polymer dots

Aggregate, Journal Year: 2022, Volume and Issue: 3(2)

Published: Jan. 20, 2022

Abstract The aggregate luminescence behavior of organic luminescent materials has been studied extensively. As a new kind nanomaterials, carbonized polymer dots (CPDs) not only inherit the stability and biocompatibility carbon materials, but also possess tunability, water solubility, high photoluminescence quantum yield rendering them strong candidate for next generation light‐emitting materials. Previously, people mainly understood its from perspective some mechanisms are still unclear. In this review, we discuss mechanism by referring to with emphasis on their aggregation behavior. Firstly, three representative phenomena briefly introduced. Chromophores present in CPDs elaborated further potential interactions between them, role crosslinked networks. On basis, special state summarized, relevant discussed detail consolidate statements.

Language: Английский

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Toward Strong Near‐Infrared Absorption/Emission from Carbon Dots in Aqueous Media through Solvothermal Fusion of Large Conjugated Perylene Derivatives with Post‐Surface Engineering

Advanced Science, Journal Year: 2022, Volume and Issue: 9(23)

Published: June 2, 2022

Carbon dots (CDs) have attracted significant interest as one of the most emerging photoluminescence (PL) nanomaterials. However, realization CDs with dominant near-infrared (NIR) absorption/emission peaks in aqueous solution remains a great challenge. Herein, both main NIR absorption bands at 720 nm and emission 745 an are fabricated for first time by fusing large conjugated perylene derivatives under solvothermal treatment. With post-surface engineering, polyethyleneimine modified (PEI-CDs) exhibit enhanced PL quantum yields (PLQY) up to 8.3% 18.8% bovine serum albumin DMF solutions, which is highest PLQY region excitation. Density functional theory calculations support strategy achieve emissions from CDs. Compared commercial dye Indocyanine green, PEI-CDs excellent photostability much lower cost. Furthermore, obtained illustrate advantages remarkable two-photon angiography vivo fluorescence bioimaging. This work demonstrates promising molecules preparing strong promote their bioimaging applications.

Language: Английский

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Synthesis strategies, luminescence mechanisms, and biomedical applications of near-infrared fluorescent carbon dots

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 470, P. 214703 - 214703

Published: July 13, 2022

Language: Английский

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Integrating Pt nanoparticles with carbon nanodots to achieve robust cascade superoxide dismutase-catalase nanozyme for antioxidant therapy

Nano Today, Journal Year: 2023, Volume and Issue: 49, P. 101768 - 101768

Published: Feb. 3, 2023

Language: Английский

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Antibacterial Carbon Dots: Mechanisms, Design, and Applications

Advanced Healthcare Materials, Journal Year: 2023, Volume and Issue: 12(23)

Published: May 13, 2023

Abstract The increase in antibiotic resistance promotes the situation of developing new antibiotics at forefront, while development non‐antibiotic pharmaceuticals is equally significant. In post‐antibiotic era, nanomaterials with high antibacterial efficiency and no drug make them attractive candidates for materials. Carbon dots (CDs), as a kind carbon‐based zero‐dimensional nanomaterial, are attracting much attention their multifunctional properties. abundant surface states, tunable photoexcited excellent photo‐electron transfer properties sterilization CDs feasible gradually emerging field. This review provides comprehensive insights into recent topics include mechanisms, design, optimization processes, potential practical applications also highlighted, such treatment bacterial infections, against biofilms, surfaces, food preservation, bacteria imaging detection. Meanwhile, challenges outlook field discussed proposed.

Language: Английский

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