Carbon Dots: A Review with Focus on Sustainability

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: July 18, 2024

Abstract Carbon dots (CDs) are an emerging class of nanomaterials with attractive optical properties, which promise to enable a variety applications. An important and timely question is whether CDs can become functional sustainable alternative incumbent nanomaterials, notably inorganic quantum dots. Herein, the current CD literature comprehensively reviewed as regards their synthesis function, focus on sustainability aspects. The study quantifies why it that be synthesized biomass sole starting material free from toxic precious metals critical raw materials. It further describes analyzes employed pretreatment, chemical‐conversion, purification, processing procedures, highlights issues usage solvents, energy efficiency, safety waste management. specially shown many reported methods concerningly wasteful utilization non‐sustainable solvents energy. finally recommended future studies should explicitly consider discuss environmental influence selected material, generated byproducts, quantitative information required amounts consumables, provided evaluation presented in upscaled context.

Language: Английский

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Impact of the Electrode Material on the Performance of Light-Emitting Electrochemical Cells

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Light-emitting electrochemical cells (LECs) are promising candidates for fully solution-processed lighting applications because they can comprise a single active-material layer and air-stable electrodes. While their performance is often claimed to be independent of the electrode material selection due in situ formation electric double layers (EDLs), we demonstrate conceptually experimentally that this understanding needs modified. Specifically, exciton generation zone observed affected by work function. We rationalize finding proposing ion concentration injection-facilitating EDLs depends on offset between function respective semiconductor orbital, which turn influences number ions available doping hence shifts zone. Further, investigate effects losses surface plasmon polaritons discuss impact cavity density. conclude showing replicate measured luminance transients an optical model considers these electrode-dependent effects. As such, our findings provide rational design criteria considering materials, thickness, its composition concert achieve optimum LEC performance.

Language: Английский

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Recent Trends in Use of Plant-Derived Carbon Dot-Based Fluorescent Probes for Heavy Metal Ion Detection and Their Biological Applications

Trends in Environmental Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. e00259 - e00259

Published: Feb. 1, 2025

Language: Английский

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Observing Carbon Dots in Putative Boron Nitride Quantum Dots

Nano Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

Boron nitride quantum dots (BNQDs) have garnered a significant amount of attention in recent years due to their attractive optical properties, high stability, low toxicity, and good biocompatibility. However, our study reveals critical mischaracterization this field, demonstrating that some so-called BNQDs are, fact, carbon (CDs) formed through the unintended carbonization organic solvents during synthesis. Herein, we investigate widely used combination sonication solvothermal conversion for BNQD preparation, using ethanol

Language: Английский

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Engineering Solid‐State Fluorescent Carbon Dots with Aggregation‐Induced Emission by Fatty Amine Chains‐Regulated Charge Transfer and π‐π Stacking

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Carbon dots (CDs) are an encouraging green luminescent material; however, the aggregation‐caused quenching (ACQ) effect poses a significant limitation for their use in solid‐state devices. By adjusting precursor fatty amine chains, this paper synthesized four emissive CDs with aggregation‐induced emission (AIE) properties (Lx‐CDs). When water is introduced, generation of Lx‐CDs aggregates creates switching off carbon‐core (blue) acetic acid solution and on surface‐state (orange). Results demonstrate that disulfide bond chain structures allow considerable inhibition distance aromatic skeletons, causing aggregation‐state emission, multiple interactions can reduce non‐radiative processes benefiting AIE. Besides, fast slow fluorescence species be confirmed to correspond paths surface‐state, respectively. The wavelength, photoluminescence quantum yield (PLQY), AIE strength engineered by regulated charge transfer π‐π stacking. This study not only reveals intrinsic mechanism luminescence dynamics but also provides method controlling wavelength enhancing aggregated particles using length.

Language: Английский

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Dual-Functional Carbon Dot Films: Blue-Light Filtration and Cyan-Light Conversion for Healthier White Light-Emitting Diodes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Blue light emitted by commercial white light-emitting diodes (WLEDs) in the 440-470 nm range poses ocular health risks with prolonged exposure. Effective filtration is crucial for health-conscious lighting, but traditional filters often cause color distortion completely removing blue emission. In this study, we address challenge synthesizing carbon dots (CDs) strong absorption at 460 and bright cyan emission 485 nm, featuring a photoluminescence quantum yield of 65% narrow full width half-maximum 30 nm. When embedded poly(vinyl alcohol) (PVA) matrix, CDs@PVA films effectively filter UV-to-blue light, reducing blue-light ratio from 27.2% to 2.7%. At same time, preserves light's spectral composition, achieving rendering index 83 ± 5. This dual functionality demonstrates potential CDs enable safer WLEDs that improve both lighting quality.

Language: Английский

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Enhancing the Fluorescence and Antimicrobial Performance of Carbon Dots via Hypochlorite Treatment

Nanomaterials, Journal Year: 2025, Volume and Issue: 15(3), P. 184 - 184

Published: Jan. 24, 2025

This paper presents a simple, post-synthesis treatment of carbon dots (C-dots) that relies on the oxidizing activity sodium hypochlorite to induce surface oxidation, etching and pronounced structural rearrangements. The thus treated C-dots (ox-C-dots) exhibit up six-fold enhancement in quantum yield compared non-oxidised analogues, while maintaining low levels cytotoxicity against HeLa U87 cell lines. In addition, we demonstrate range polymeric materials (polyurethane sponge, polyvinylidene fluoride membrane, polyester fabric) impregnated with ox-C-dots show advanced antifungal properties Talaromyces pinophilus, their untreated counterparts fail do so.

Language: Английский

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Challenges in Synthesizing Hexagonal Boron Nitride “Quantum” Dots

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Fluorescent nanodots derived from hexagonal boron nitride (h-BN) have garnered significant attention over the past decade. As a result, various synthesis methods─encompassing both bottom-up hydrothermal reactions and top-down exfoliation processes─have been deemed "successful" in producing BN nanodots. Nevertheless, this Perspective emphasizes that substantial challenges remain of "true" composed mainly h-BN units, as many so-called successful syntheses reported literature involve some mischaracterizations. Here, we highlight crucial necessity for strict conditions to facilitate production authentic Furthermore, it is imperative re-evaluate optical properties photoluminescence mechanisms these nanodots, entailing establishment clear criteria what constitutes

Language: Английский

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Deep-Blue and Narrowband-Emitting Carbon Dots from a Sustainable Precursor for Random Lasing

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 30, 2025

Deep-blue (DB) emitters that feature high photoluminescence quantum yield (PLQY) and narrow spectral bandwidth are desired for a variety of optoelectronic applications, particularly lighting, illumination, lasing. Currently favored DB constitute dots comprising cadmium or lead organic compounds derived from petroleum, but they suffer toxicity sustainability issues. Here, we report the solvothermal synthesis DB-emitting carbon (DB-CDs) using bioderivable phloroglucinol as sole starting material, which exhibit peak emission wavelength 403 nm, full width at half-maximum 35 PLQY 61% in ethanol. The DB-CDs with planar structure demonstrated to comprise distinct graphene segments polyether-cross-link network, former functioning fluorophore. application merit is exemplified by their implementation gain medium random laser device, exhibits threshold optical power density 40.5 kW cm–2. This study thus demonstrates path toward efficient sustainable deep-blue emitters, can be exploited practical applications.

Language: Английский

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Ultra-Sensitive Gas Sensor Based on CDs@ZnO

Sensors, Journal Year: 2025, Volume and Issue: 25(3), P. 905 - 905

Published: Feb. 2, 2025

Ethylene glycol (EG) is a colorless and odorless organic compound, which an important industrial raw material but harmful to the environment human health. Thus, it necessary develop high-performance sensing materials monitor EG gas. Herein, sea urchin-shaped ZnO was successfully synthesized by hydrothermal method. Subsequently, series of carbon dot (CD)-modified nanocomposites were prepared using simple mechanical grinding The CDs@ZnO-1 sensor exhibits excellent response gas, with value 1356.89 100 ppm at optimal operating temperature (220 °C). After five cycles detection, can still maintain stable response. enhanced performance be attributed rich oxygen vacancies that are generated on surface CDs@ZnO, heterojunction formed between p-type CDs n-type ZnO. This study provides inspiration for development high-response semiconductor metal oxide sensors.

Language: Английский

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