scholarly journals Graphene quantum dots based on maltose as a high yield photocatalyst for efficient photodegradation of imipramine in wastewater samples

2020 ◽  
Vol 18 (2) ◽  
pp. 1531-1540
Author(s):  
Raheleh Hatefi ◽  
Ali Mashinchian-Moradi ◽  
Habibollah Younesi ◽  
Saeed Nojavan
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Wastewater Samples

scholarly journals Green Preparation of High Yield Fluorescent Graphene Quantum Dots from Coal-Tar-Pitch by Mild Oxidation

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 844 ◽  
Author(s):  
Quanrun Liu ◽  
Jingjie Zhang ◽  
He He ◽  
Guangxu Huang ◽  
Baolin Xing ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Coal Tar ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Coal Tar Pitch ◽  
Narrow Size Distribution ◽  
Material Source ◽  
Graphene Layers ◽  
Mild Conditions ◽  
Simple Strategy

Coal tar pitch (CTP), a by-product of coking industry, has a unique molecule structure comprising an aromatic nucleus and several side chains bonding on this graphene-like nucleus, which is very similar to the structure of graphene quantum dots (GQDs). Based on this perception, we develop a facile approach to convert CTP to GQDs only by oxidation with hydrogen peroxide under mild conditions. One to three graphene layers, monodisperse GQDs with a narrow size distribution of 1.7 ± 0.4 nm, are obtained at high yield (more than 80 wt. %) from CTP. The as-produced GQDs are highly soluble and strongly fluorescent in aqueous solution. This simple strategy provides a feasible route towards the commercial synthesis of GQDs for its cheap material source, green reagent, mild condition, and high yield.

scholarly journals High yield synthesis of graphene quantum dots from biomass waste as a highly selective probe for Fe3+ sensing

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aumber Abbas ◽  
Tanveer A. Tabish ◽  
Steve J. Bull ◽  
Tuti Mariana Lim ◽  
Anh N. Phan
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Cost Effective ◽  
Renewable Resource ◽  
Microwave Treatment ◽  
High Yield ◽  
Biomass Waste ◽  
Practical Applications

AbstractGraphene quantum dots (GQDs), a novel type of zero-dimensional fluorescent materials, have gained considerable attention owing to their unique optical properties, size and quantum confinement. However, their high cost and low yield remain open challenges for practical applications. In this work, a low cost, green and renewable biomass resource is utilised for the high yield synthesis of GQDs via microwave treatment. The synthesis approach involves oxidative cutting of short range ordered carbon derived from pyrolysis of biomass waste. The GQDs are successfully synthesised with a high yield of over 84%, the highest value reported to date for biomass derived GQDs. As prepared GQDs are highly hydrophilic and exhibit unique excitation independent photoluminescence emission, attributed to their single-emission fluorescence centre. As prepared GQDs are further modified by simple hydrothermal treatment and exhibit pronounced optical properties with a high quantum yield of 0.23. These modified GQDs are used for the highly selective and sensitive sensing of ferric ions (Fe3+). A sensitive sensor is prepared for the selective detection of Fe3+ ions with a detection limit of as low as 2.5 × 10–6 M. The utilisation of renewable resource along with facile microwave treatment paves the way to sustainable, high yield and cost-effective synthesis of GQDs for practical applications.

High-yield synthesis of graphene quantum dots with strong green photoluminescence

RSC Advances ◽  
2014 ◽  
Vol 4 (91) ◽  
pp. 50141-50144 ◽  
Author(s):  
J. Gu ◽  
M. J. Hu ◽  
Q. Q. Guo ◽  
Z. F. Ding ◽  
X. L. Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Photoluminescence Emission ◽  
Emission Performance ◽  
Fluorescent Quantum Yield ◽  
Green Photoluminescence

The obtained GQDs have high fluorescent quantum yield (FL QY = 44.3%) and excitation-independent photoluminescence emission performance.

One-step and high yield simultaneous preparation of single- and multi-layer graphene quantum dots from CX-72 carbon black

2012 ◽  
Vol 22 (18) ◽  
pp. 8764 ◽  
Author(s):  
Yongqiang Dong ◽  
Congqiang Chen ◽  
Xinting Zheng ◽  
Lili Gao ◽  
Zhiming Cui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Black ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Layer Graphene ◽  
One Step

Charcoal derived graphene quantum dots for flexible supercapacitor oriented applications

2020 ◽  
Vol 44 (26) ◽  
pp. 11085-11091 ◽  
Author(s):  
Arvind Singh ◽  
Sumeet Kumar ◽  
Animesh K. Ojha
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Raw Material ◽  
High Yield ◽  
Supercapacitor Application ◽  
Flexible Supercapacitor

In this article, charcoal is used as a new raw material for the synthesis of high yield graphene quantum dots (GQDs) for supercapacitor application.

Mass Production of Graphene Quantum Dots by One-Pot Synthesis Directly from Graphite in High Yield

Small ◽  
2013 ◽  
Vol 10 (5) ◽  
pp. 866-870 ◽  
Author(s):  
Yonghun Shin ◽  
Junghyun Lee ◽  
Junghee Yang ◽  
Jintaek Park ◽  
Keunsik Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Mass Production ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
One Pot ◽  
One Pot Synthesis

scholarly journals Synthesis, Optical, and Magnetic Properties of Graphene Quantum Dots and Iron Oxide Nanocomposites

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
M. Sajjad ◽  
V. Makarov ◽  
M. S. Sultan ◽  
W. M. Jadwisienczak ◽  
B. R. Weiner ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Uv Light ◽  
Room Temperature Ferromagnetism ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Medical Applications ◽  
Laser Discharge ◽  
Optical And Magnetic Properties

The combination of nanomaterial graphene quantum dots (GQDs) with magnetic nanoparticles offers a unique set of optical and magnetic properties for future energy and medical applications. We report on the synthesis and engineering of GQDs and iron oxide (Fe3O4) nanocomposites (NCs) by using a pulsed laser discharge technique. High-resolution transmission electron microscopy (HRTEM) images showed a high yield of pure GQDs with 2–10 nm diameter. The hexagonal structures and lattice fringes associated with the C–C bond in GQDs were clearly identifiable. The structural and optical changes in GQDs and GQDs-Fe3O4 NC samples induced by UV light were investigated by the absorption and emission spectroscopy over the deep UV–visible spectral range. The photoluminescence spectra have shown subband π→π∗ transitions in GQDs-Fe3O4 NC. Magnetic properties of the GQDs-Fe3O4 NC samples have shown room temperature ferromagnetism induced by pure Fe3O4 nanoparticles and from the substantial spin polarized edges of GQD nanoparticles. It is concluded that the observed optical and magnetic properties could be further tailored in the studied nanocomposites for prospective medical applications.

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