Photoluminescence enhancement <i>via</i> microwave irradiation of carbon quantum dots derived from solvothermal synthesis of <scp>l</scp>-arginine

Omer, Khalid M.; Aziz, Kosar Hikmat Hama; Salih, Yousif Mustafa; Tofiq, Diary I.; Hassan, Aso Q.

doi:10.1039/c8nj04788j

Cited by 45 publications

(18 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, the blue‐emitting CQD solution was first synthesized by normal thermal decomposition subsequent to being irradiated with microwaves; this resulted in an approximately twofold increase of the emission Φs for the microwave‐treated CQD solution relative to a non‐treated one. In addition, the disappearance of surface defects subsequent to the microwave treatment contributed to the strong enhancement of the photoemission of the CQDs [130] . Nonetheless, the photo‐induced improvement of yellow‐ to red‐emitting CQDs still needs some considerations as the relevant Φs tend to be rather low (<15 %) [131] .…”

Section: Synthetic Approaches To Cqds: Top‐down Versus Bottom‐upmentioning

confidence: 99%

Photoluminescent Carbon Quantum Dots: Synthetic Approaches and Photophysical Properties

Hagiwara

Horikoshi

Serpone

2021

Chemistry A European J

View full text Add to dashboard Cite

A number of synthetic methodologies and applications of carbon quantum dots (CQDs) have been reported since they were first discovered nearly two decades ago. Unlike metal‐based or semiconductor‐based (e. g., metal chalcogenides) quantum dots (MSQDs), CQDs have the unique feature of being prepared through a variety of synthetic protocols, which are typically understood from considerations of reaction models and photoluminescence mechanisms. Consequently, this brief review article describes quantum dots, in general, and CQDs, in particular, from various viewpoints: (i) their definition, (ii) their photophysical properties, and (iii) the superiority of CQDs over MSQDs. Where possible, comparisons are made between CQDs and MSQDs. First, however, the review begins with a general brief description of quantum dots (QDs) as nanomaterials (sizes≤10 nm), followed by a short description of MSQDs and CQDs. Described subsequently are the various top‐down and bottom‐up approaches to synthesize CQDs followed by their distinctive photophysical properties (emission spectra; quantum yields, Φs).

show abstract

Section: Synthetic Approaches To Cqds: Top‐down Versus Bottom‐upmentioning

confidence: 99%

Photoluminescent Carbon Quantum Dots: Synthetic Approaches and Photophysical Properties

Hagiwara

Horikoshi

Serpone

2021

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…Manufacturing methods are usually classified as "top-down" [16][17][18] and "bottom-up" [19][20][21]. In general, the top-down method usually takes massive materials as the precursor and obtains QDS through chemical etching, [22][23][24] microwave irradiation, [25][26][27] ultrasonic treatment, [28][29][30] electrochemical method, [3,4,31] hydrothermal/solvothermal method [32][33][34] and other methods [35][36][37]. QDs can also be chemically assembled from small organic and inorganic precursors by a bottom-up synthesis strategy [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Recent progress of quantum dots for energy storage applications

Niu

et al. 2022

Carb Neutrality

113

View full text Add to dashboard Cite

The environmental problems of global warming and fossil fuel depletion are increasingly severe, and the demand for energy conversion and storage is increasing. Ecological issues such as global warming and fossil fuel depletion are increasingly stringent, increasing energy conversion and storage needs. The rapid development of clean energy, such as solar energy, wind energy and hydrogen energy, is expected to be the key to solve the energy problem. Several excellent literature works have highlighted quantum dots in supercapacitors, lithium-sulfur batteries, and photocatalytic hydrogen production. Here, we outline the latest achievements of quantum dots and their composites materials in those energy storage applications. Moreover, we rationally analyze the shortcomings of quantum dots in energy storage and conversion, and predict the future development trend, challenges, and opportunities of quantum dots research.

show abstract

“…8 Benzene, 9 for example. Carbon dots can be made in a variety of ways, including hydrothermal, [10][11][12][13][14] solvothermal, [15][16][17] electrochemical, [18][19][20] arc discharge, laser ablation, 2,21 pyrolysis, and others. [22][23][24][25] However, to improve water solubility and fluorescence, 2 these synthetic approaches require multiple stages, including pricey precursors, post-preparative treatment, and a surface passivating agent.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dot - An Updated Review

Mukherjee¹,

Chakraborty

et al. 2022

IJPI

View full text Add to dashboard Cite

These days, carbon dots (CDs) are the rising stars of nanomaterials. Carbon dots (CDs) are small carbon nanoparticles with the same type of surface passivation (less than 10 nm in size). Researchers found C-dots by accident while purifying single-walled carbon nanotubes (SWCNTs) manufactured using the arc-discharge process. Toxic metal-based quantum dots are being replaced with carbon dots (QDs). Carbon dots are currently being prepared from a variety of natural resources in order to obtain self-passivated products at a reasonable cost. Because of their superior photo physical characteristics, biocompatibility, and low toxicity, carbon dots have prospective applications in bio sensing, bio imaging, and drug administration. Different synthetic processes, precursors, salient properties, and applications were reviewed in this review, as well as some future prospects, obstacles, and possible solutions for future development. Because of their tunable optical characteristics and better biocompatibility, luminous carbon-based nanomaterials have sparked a lot of scientific interest. Different light emission properties of carbon are discussed in this review. Distinct synthesis procedures have resulted in different carbon dots (CDs). Summarized here. The optical properties of CDs that haven't been synthesized yet surface doping and element doping can be used to further control it. CDs are being functionalized for an adjustable band gap. As a result of their luminescent with reduced cytotoxicity and tunable optical characteristics CDs have been thoroughly investigated in terms of their potential uses in biomedicine, such as analytical sensors, and instruments for bioimaging. Fluorescent carbon dots are a new type of nanomaterial from the carbon family. Green CDs, which have attracted a lot of attention from researchers because of their better water solubility, high biocompatibility, and eco-friendly nature when compared to chemically generated CDs, can be made from a variety of inexpensive and renewable resources. The presence of heteroatoms on the surface of green CDs in the form of amine, hydroxyl, carboxyl, or thiol functional groups, which can improve their physicochemical qualities, quantum yield, and likelihood of visible light absorption, eliminates the need for additional surface passivation.

show abstract

Photoluminescence enhancement via microwave irradiation of carbon quantum dots derived from solvothermal synthesis of l-arginine

Abstract: Photoluminescence enhancement of carbon quantum dots was achieved via solvothermal synthesis followed by microwave irradiation.

Cited by 45 publications

References 35 publications

Photoluminescent Carbon Quantum Dots: Synthetic Approaches and Photophysical Properties

Photoluminescent Carbon Quantum Dots: Synthetic Approaches and Photophysical Properties

Recent progress of quantum dots for energy storage applications

Carbon Dot - An Updated Review

Contact Info

Product

Resources

About