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

Trends in Chemistry, Год журнала: 2022, Номер 5(1), С. 76 - 87

Опубликована: Ноя. 10, 2022

Язык: Английский

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Nuclear Magnetic Resonance Reveals Molecular Species in Carbon Nanodot Samples Disclosing Flaws

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(20)

Опубликована: Фев. 14, 2022

Carbon nanodots are currently one of the hot topics in nanomaterials world, due to their accessible synthesis and promising features. However, purification these materials is still a critical aspect, especially for syntheses involving molecular precursors. Indeed, presence unreacted species or small organic molecules formed during solvothermal treatments can affect properties synthesized nanomaterials. To illustrate extreme importance this issue, we present two case studies which insufficient results misleading conclusions regarding chiral fluorescent investigated materials. Key identify use nuclear magnetic resonance, proves be an effective tool. Our work highlights need include resonance as standard characterization technique carbon-based nanomaterials, minimize risk observing that arise from species, rather than target carbon nanodots.

Язык: Английский

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Boosting efficiency of luminescent solar concentrators using ultra-bright carbon dots with large Stokes shift

Nanoscale Horizons, Год журнала: 2022, Номер 8(1), С. 83 - 94

Опубликована: Окт. 18, 2022

Luminescent solar concentrators (LSCs) are able to collect sunlight from a large-area generate electric power with low cost, showing great potential in building-integrated photovoltaics. However, the efficiency of LSCs caused by reabsorption losses is critical issue that hampers their practical applications. In this work, we synthesized novel yellow emissive carbon dots (CDs) large Stokes shift 193 nm, which exhibit nearly zero reabsorption. The quantum yield (QY) emitting CDs up 61%. can be employed fabricate high-performance due successful suppression losses. as-prepared absorb 14% as absorption matches well sun's spectrum. LSC (10 × 10 cm2) laminated structure based on achieves an optical conversion (ηopt) 4.56% and (ηPCE) 4.1% under natural (45 mW cm-2), significantly higher than other previously reported works similar sizes. Furthermore, prepared show good stability. This method synthesizing for high-efficiency provides useful platform future study application LSCs.

Язык: Английский

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Carbon Nanomaterial Fluorescent Probes and Their Biological Applications

Chemical Reviews, Год журнала: 2024, Номер 124(6), С. 3085 - 3185

Опубликована: Март 13, 2024

Fluorescent carbon nanomaterials have broadly useful chemical and photophysical attributes that are conducive to applications in biology. In this review, we focus on materials whose photophysics allow for the use of these biomedical environmental applications, with emphasis imaging, biosensing, cargo delivery. The review focuses primarily graphitic including graphene its derivatives, nanotubes, as well dots nanohoops. Recent advances future prospects fields discussed at depth, where appropriate, references reviews pertaining older literature provided.

Язык: Английский

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The Importance of the Purification Step and the Characterization of the Products in the Synthesis of Carbon Nanodots

Small, Год журнала: 2023, Номер 19(31)

Опубликована: Фев. 20, 2023

In the synthesis of carbon nanodots (CNDs), critical step purification from starting materials and unwanted side products is faced. exciting race toward new interesting CNDs, this problem often underestimated, leading to false properties erroneous reports. fact, on many occasions, described for novel CNDs derive impurities not completely eliminated during process. Dialysis, instance, always helpful, especially if are soluble in water. Perspective, importance characterization steps, order obtain solid reports reliable procedures, emphasized.

Язык: Английский

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Matrix-Free Thermally Activated Delayed Fluorescent Carbon Dots-Based Electroluminescent Light-Emitting Diodes Exceeding 5.6% External Quantum Efficiency

Nano Letters, Год журнала: 2024, Номер 24(9), С. 2904 - 2911

Опубликована: Фев. 22, 2024

Carbon dots (CDs) are promising luminescent emission layer materials for next generation electroluminescent light emitting diodes (EL-LEDs) due to their many advantages, such as environmental friendliness, low cost, and high stability. However, limited by the spin-forbidden properties of triplet transition, it is difficult improve external quantum efficiency (EQE) fluorescent CDs-based EL-LEDs. Meanwhile, traditional thermally activated delayed (TADF) CDs prepared using coating strategies utilize in EL-LEDs nonconductivity agent. Herein, we successfully developed matrix-free TADF with yellow achieved a device EQE 5.68%, which highest value reported In addition, also white an 1.70%. This study highlights importance interactions between precursors modulating electroluminescence emitters provides effective design principle CDs.

Язык: Английский

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Efficient synthesis of high-purity carbon dots via self-polymerization driven bottom-up growth for high-selectivity sensing and high-efficiency separation

Carbon, Год журнала: 2024, Номер 226, С. 119169 - 119169

Опубликована: Апрель 21, 2024

Язык: Английский

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Separation and purification of fluorescent carbon dots – an unmet challenge

The Analyst, Год журнала: 2024, Номер 149(6), С. 1680 - 1700

Опубликована: Янв. 1, 2024

Literature reports demonstrate versatile optical applications of fluorescent carbon dots (CDs) in biological imaging, full-color solid-state lighting, optoelectronics, sensing, anticounterfeiting and so on. The fluorescence associated with CDs may originate significantly from byproducts generated during their synthesis, which need to be eliminated achieve error-free results. significance purification, specifically for luminescence-based characterizations, is highly critical imperative. Thus, there a pressing demand implement consistent adequate purification strategies reduce sample complexity thereby realize reliable results that can provide tactical steppingstone towards the advancement as next-generation materials. article focuses on mechanism origin further demonstrates different approaches including dialysis, centrifugation, filtration, solvent extraction, chromatography, electrophoresis have been adopted by various researchers. Furthermore, fundamental separation mechanism, well advantages limitations each these techniques are discussed. finally provides challenges overcome obtain homogeneous CD fractions coherent features suitable applications.

Язык: Английский

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Rational design multi-color-emissive chemiluminescent carbon nanodots in a single solvothermal reaction

Nano Research, Год журнала: 2024, Номер 17(6), С. 4651 - 4660

Опубликована: Янв. 30, 2024

Язык: Английский

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Recent Progress on Second Near-Infrared Emitting Carbon Dots in Biomedicine

ACS Nano, Год журнала: 2024, Номер 18(18), С. 11560 - 11572

Опубликована: Апрель 29, 2024

Second near-infrared (NIR-II) carbon dots, with absorption or emission between 1000 and 1700 nm, are gaining increasing attention in the biomaterial field due to their distinctive properties, which include straightforward preparation processes, stable photophysical characteristics, excellent biocompatibility, low cost. As a result, there is growing focus on controlled synthesis modulation of photochemical properties NIR-II aim further expand biomedical applications, current research hotspot. This account aims provide comprehensive overview recent advancements dots within field. The review will cover following topics: (i) design, synthesis, purification (ii) surface modification strategies, (iii) particularly domain cancer theranostics. Additionally, this addresses challenges encountered by outline future directions realm By exploring carbon-based biomaterials, we can anticipate that contribution garner increased contribute development next-generation advanced functional thereby offering enhanced tools strategies

Язык: Английский

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