scholarly journals The effect of oxygen on the microwave-assisted synthesis of carbon quantum dots from polyethylene glycol

RSC Advances ◽  
2017 ◽  
Vol 7 (27) ◽  
pp. 16637-16643 ◽  
Author(s):  
Yunyang Zhao ◽  
Songlin Zuo ◽  
Meng Miao
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Polyethylene Glycol ◽  
Carbon Source ◽  
Microwave Irradiation ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Irradiation Method ◽  
Microwave Assisted ◽  
Effect Of Oxygen

Fluorescent carbon quantum dots (CQDs) were synthesized using polyethylene glycol (PEG) as both the carbon source and solvent in various atmospheres including air, nitrogen, carbon dioxide and oxygen by following a microwave irradiation method.

scholarly journals Microwave-assisted synthesis of fluorescent carbon quantum dots from an A2/B3 monomer set

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12663-12669 ◽  
Author(s):  
Ari Chae ◽  
Yujin Choi ◽  
Seongho Jo ◽  
Nur'aeni Nur'aeni ◽  
Peerasak Paoprasert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Succinic Acid ◽  
Carbon Quantum Dots ◽  
High Mass ◽  
Microwave Assisted Synthesis ◽  
Mass Yield ◽  
Microwave Assisted ◽  
Fluorescent Carbon

Strongly fluorescent carbon quantum dots (CQDs) were simply prepared by microwave-assisted synthesis using succinic acid and tris(2-aminoethyl)amine as an “A2 + B3” monomer set with a high mass yield of 17.3%.

Air-exposing microwave-assisted synthesis of CuInS2/ZnS quantum dots for silicon solar cells with enhanced photovoltaic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102682-102688 ◽  
Author(s):  
Ming Hong ◽  
Tongtong Xuan ◽  
Jiaqing Liu ◽  
Ziyao Jiang ◽  
Yiwei Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Microwave Irradiation ◽  
Conversion Efficiency ◽  
Photovoltaic Performance ◽  
Composite Films ◽  
Silicon Solar Cells ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Si Solar Cells

CIS/ZnS QDs were synthesized by microwave irradiation in air. The fabricated QDs/PMMA composite films were first applied to Si solar cells to improve the conversion efficiency by 3.8%.

Microwave-Assisted Synthesis of Biocompatible Silk Fibroin-Based Carbon Quantum Dots

2017 ◽  
Vol 35 (3) ◽  
pp. 1700300 ◽  
Author(s):  
Na Re Ko ◽  
Md Nafiujjaman ◽  
Kondareddy Cherukula ◽  
Sang Ju Lee ◽  
Seoung-Jin Hong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silk Fibroin ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

scholarly journals Accelerated syntheses of amine-bis(phenol) ligands in polyethylene glycol or “on water” under microwave irradiation

2008 ◽  
Vol 86 (5) ◽  
pp. 435-443 ◽  
Author(s):  
Francesca M Kerton ◽  
Stacey Holloway ◽  
Angela Power ◽  
R Graeme Soper ◽  
Kristina Sheridan ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Microwave Irradiation ◽  
Hydrophobic Effect ◽  
High Yield ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Mannich Condensation ◽  
Time And Energy

Pure amine-bis(phenol) ligands are readily accessible in high yield, often >90%, when the Mannich condensation reactions are performed “on water” or in poly(ethyleneglycol) (PEG). Microwave-assisted synthesis dramatically reduces the time and energy required to prepare these molecules, typically from 24 h to 5 min. The approach seems to be widely applicable (7 amines and 5 phenols were tested to yield a diverse set of bis(phenol) ligands). Significant improvements in yield were observed for ligands derived from di-tert-amyl and di-tert-butyl phenols, possibly resulting from a hydrophobic effect. Single crystal X-ray diffraction data for the ligand derived from p-cresol and N,N′-dimethylethylenediamine is reported.Key words: amine-phenol, Mannich condensation, on water, microwave, ligand, high-throughput.

scholarly journals Microwave-Assisted Green Synthesis of Carbon Quantum Dots Derived from Calotropis Gigantea as a Fluorescent Probe for Bioimaging

2021 ◽  
Author(s):  
Neetu Sharma ◽  
Indu Sharma ◽  
Milan Kumar Bera
Keyword(s):  
Quantum Dots ◽  
Aqueous Suspension ◽  
Significant Proportion ◽  
Carbon Quantum Dots ◽  
Quantum Yields ◽  
Microwave Assisted Synthesis ◽  
Nuclear Magnetic Resonance Analysis ◽  
Synthetic Dyes ◽  
Calotropis Gigantea ◽  
Microwave Assisted

Abstract In this study, an eco-friendly, cost-effective, and convenient method for preparing biocompatible fluorescent carbon quantum dots (CQDs) by one-pot microwave assisted synthesis from the leaf extract of the medicinal plant Calotropis gigantea, also known as crown flower, has been demonstrated. As-synthesized CQDs demonstrated fluorescence quantum yields up to 4.24 percent. The size distribution of the as-synthesized CQDs varied from 2.7 to 10.4 nm, with a significant proportion of sp2 and sp3 carbon groups verified by nuclear magnetic resonance analysis. The zeta potential of as-synthesized CQDs was measured to be –13.8 mV, indicating the existence of a negatively charged surface with incipient instability in aqueous suspension. Furthermore, as an alternative to organic or synthetic dyes, the development of simple, inexpensive, and non-destructive fluorescence-based staining agents are highly desired. In this regard, as-synthesized CQDs shown remarkable fluorescent staining capabilities in this work and may be utilised as a suitable probe for optical and bio-imaging of bacteria, fungi, and plant cells.

Microwave-assisted synthesis of luminescent and biocompatible lysine-based carbon quantum dots

2017 ◽  
Vol 47 ◽  
pp. 329-335 ◽  
Author(s):  
Yujin Choi ◽  
Nichaphat Thongsai ◽  
Ari Chae ◽  
Seongho Jo ◽  
Eun Bi Kang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

scholarly journals Correction to Simple Microwave-Assisted Synthesis of Amphiphilic Carbon Quantum Dots from A3/B2 Polyamidation Monomer Set

2018 ◽  
Vol 10 (3) ◽  
pp. 3153-3153 ◽  
Author(s):  
Insik In ◽  
Sung Young Park ◽  
Donggun Lim ◽  
Jeong Eun Park ◽  
Young Kwang Kim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

scholarly journals Microwave-Assisted Synthesis of 3,5-Dibenzyl-4-amino-1,2,4-triazole and its Diazo Ligand, Metal Complexes Along with Anticancer Activity

2010 ◽  
Vol 7 (4) ◽  
pp. 1571-1577 ◽  
Author(s):  
Anjali Jha ◽  
Y. L. N. Murthy ◽  
G. Durga ◽  
T. T. Sundari
Keyword(s):  
Microwave Irradiation ◽  
Metal Complexes ◽  
Anticancer Activity ◽  
Cell Lines ◽  
Conventional Method ◽  
Ruthenium Complexes ◽  
Microwave Assisted Synthesis ◽  
Microwave Irradiation Method ◽  
Anticancer Activities ◽  
Microwave Assisted

Synthesis of 3,5-dibenzyl-4-amino-1,2,4-triazole was accomplished via a conventional method as well as microwave irradiation method, followed by diazotization and coupling with 2,4-pentanedione. The dinucleating ligand was isolated and complexed with Ni(II), Cu(II) and Ru(III) chlorides. These complexes were screened on Jurkat, Raji & PBMC cell lines for anticancer activity. Ruthenium complexes showed potential anticancer activities.

Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract

MRS Advances ◽  
2016 ◽  
Vol 1 (19) ◽  
pp. 1371-1376 ◽  
Author(s):  
George R. S. Andrade ◽  
Silvânio S. L. Costa ◽  
Cristiane C. Nascimento ◽  
Iara F. Gimenez
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Energy Efficient ◽  
Emission Spectra ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
Photoluminescence Properties ◽  
Microwave Assisted ◽  
Band Position ◽  
The One

ABSTRACTIn this work, 3 simple, fast, labour and energy efficient methodologies were used to prepare carbon quantum dots (C-dots) using a red beetroot (Beta vulgaris subsp. vulgaris var. vulgaris) aqueous extract as the carbon source: alkali-assisted (AA), microwave-assisted (MA) and alkali-microwave-assisted (AMA) synthesis. TEM images shows nanoparticles with a nearly spherical morphology and diameters around 7.0 nm. FTIR spectra show characteristic peaks of C-H, C-O, O-H and C=C bonds for all the samples. The emission spectra show an interesting feature of the as-prepared samples: the emission band position can be tunable by changing the excitation wavelength. Comparing the 3 different methodologies in terms of photoluminescence properties, the one based only on the microwave-assisted heating has showed the most improved emission.

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