Carbon Dots Synthesized from Green Precursors with an Amplified Photoluminescence: Synthesis, Characterization, and Its Application

Sim, Lan Ching; Tai, Jun; Khor, Jia Min; Wong, Jing Lin; Lee, Jie Yet; Leong, Kok Hoong; Saravanan, Pichiah; Aziz, Azrina Abd

doi:10.1007/978-3-030-16379-2_1

Cited by 4 publications

(3 citation statements)

References 128 publications

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“…Carbon dots (CDs) are fluorescent carbon-based nanoparticles with tunable and functional photoluminescence. , Since their serendipitous discovery during carbon nanotube purification in 2004, they have gained significant interest for application as a new generation light source, − solution-based chemo-sensors for detecting chemicals and metal cations, ,− and nanoprobes for mapping biological systems. ,− Moreover, they have shown great potential to be applied directly or in hybrid materials for photocatalytic and electrocatalytic applications. − CDs are generally regarded as environmentally friendly, nontoxic material because the synthesis precursors are relatively abundant, harmless, and environmentally friendly and the synthesis does not involve extreme reaction conditions nor produces harmful waste. − This motivates their use outside the academic research lab in industrial and consumer applications. An example being their use as sensors for the detection of dangerous chemicals, for the detection of reaction products in high-throughput catalyst testing, or even to map the heterogeneity in the chemical composition of porous materials.…”

Section: Introductionmentioning

confidence: 99%

Dual Fluorescence in Glutathione-Derived Carbon Dots Revisited

et al. 2022

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Dual-fluorescence carbon dots have great potential as nanosensors in life and materials sciences. Such carbon dots can be obtained via a solvothermal synthesis route with glutathione and formamide. In this work, we show that the dual-fluorescence emission of the synthesis products does not originate from a single carbon dot emitter, but rather from a mixture of physically separate compounds. We characterized the synthesis products with UV–vis, Raman, infrared, and fluorescence spectroscopy, and identified blue-emissive carbon dots and red-emissive porphyrin. We demonstrate an easy way to separate the two compounds without the need for time-consuming dialysis. Understanding the nature of the system, we can now steer the synthesis toward the desired product, which paves the way for a cheap and environmentally friendly synthesis route toward carbon dots, water-soluble porphyrin, and mixed systems.

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Section: Introductionmentioning

confidence: 99%

Dual Fluorescence in Glutathione-Derived Carbon Dots Revisited

et al. 2022

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“…Furthermore, fluorescence of CDs reveals λ ex -dependent emission. PL spectroscopy is most commonly used to determine the photoluminescent lifetime of CDs [82,155,167,168]. Figure 7 shows illustrations of UV-Vis absorption spectra, PL spectra at different λ ex , and time-resolved PL spectra of sulfur-doped carbon dots (S-CDs) [169].…”

Section: Characterization Of Cds By Spectroscopymentioning

confidence: 99%

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

2021

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Carbon dots (CDs) are usually smaller than 10 nm in size, and are meticulously formulated and recently introduced nanomaterials, among the other types of carbon-based nanomaterials. They have gained significant attention and an incredible interest in the field of nanotechnology and biomedical science, which is merely due to their considerable and exclusive attributes; including their enhanced electron transferability, photobleaching and photo-blinking effects, high photoluminescent quantum yield, fluorescence property, resistance to photo-decomposition, increased electrocatalytic activity, good aqueous solubility, excellent biocompatibility, long-term chemical stability, cost-effectiveness, negligible toxicity, and acquaintance of large effective surface area-to-volume ratio. CDs can be readily functionalized owing to the abundant functional groups on their surfaces, and they also exhibit remarkable sensing features such as specific, selective, and multiplex detectability. In addition, the physico-chemical characteristics of CDs can be easily tunable based on their intended usage or application. In this comprehensive review article, we mainly discuss the classification of CDs, their ideal properties, their general synthesis approaches, and primary characterization techniques. More importantly, we update the readers about the recent trends of CDs in health care applications (viz., their substantial and prominent role in the area of electrochemical and optical biosensing, bioimaging, drug/gene delivery, as well as in photodynamic/photothermal therapy).

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“…Carbon Dots (CDs) seems to be the ideal solution to these problems because are based on carbon, which is among the most abundant and biocompatible elements, present low toxicity, are simply disposable, have good water solubility and chemical stability [23], while keeping excellent optical properties similar to inorganic QDs, like strong photoluminescence, high luminous stability, optical tunability, and a very high photo-luminescence quantum yield [24]- [26]. In addition, CDs can be simply fabricated with different methods [27] and from a really wide range of precursors from chemicals like urea (U) [28], citric acid (CA) [29], sodium citrate [30], glucosamine [31], ascorbic acid [32], ethanol [33] and so on, to everyday-use materials like spent coffee grounds [34], milk, human hairs, onions, eggs, lemon and so on [27]. Generally, two precursors are used, a carbon source that contributes to the dot's core formation, and a source of functionalizing agents that link on the surface of dots determining their optical properties.…”

Section: Introductionmentioning

confidence: 99%

Molar ratio precursor investigation: a simple route to fabricate unfiltered carbon dot-based electroluminescent devices

Trapani

Saiano

Boninelli

et al. 2023

Preprint

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In this paper we report a rapid, low cost and easy way to produce solid-state luminescent carbon-dots (CDs) as color converters for light-emitting diodes (LEDs). CD precursor (urea and citric acid) molar ratio in aqueous solution is varied with the aim to find out the best conditions for an efficient color conversion and reducing photoluminescence quenching without any additional treatments, and to produce color conversion LEDs in a simple and green way.

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Carbon Dots Synthesized from Green Precursors with an Amplified Photoluminescence: Synthesis, Characterization, and Its Application

Cited by 4 publications

References 128 publications

Dual Fluorescence in Glutathione-Derived Carbon Dots Revisited

Dual Fluorescence in Glutathione-Derived Carbon Dots Revisited

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

Molar ratio precursor investigation: a simple route to fabricate unfiltered carbon dot-based electroluminescent devices

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