scholarly journals Rapid synthesis of graphene quantum dots using a continuous hydrothermal flow synthesis approach

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14716-14720 ◽  
Author(s):  
Suela Kellici ◽  
John Acord ◽  
Nicholas P. Power ◽  
David J. Morgan ◽  
Paolo Coppo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Environmentally Benign ◽  
Rapid Synthesis ◽  
Flow Synthesis ◽  
Benign Synthesis ◽  
Low Cytotoxicity ◽  
Green Fluorescent ◽  
Synthesis Approach ◽  
Hydrothermal Flow

A rapid and environmentally benign synthesis of green fluorescent graphene quantum dots (GQD) with low cytotoxicity via Continuous Hydrothermal Flow Synthesis (CHFS) aided by calix[4]arene tetrasulfonic acid (SCX4) as a particle size limiting agent.

scholarly journals Continuous hydrothermal flow synthesis of graphene quantum dots

2018 ◽  
Vol 3 (6) ◽  
pp. 949-958 ◽  
Author(s):  
Suela Kellici ◽  
John Acord ◽  
Katherine E. Moore ◽  
Nicholas P. Power ◽  
Vesna Middelkoop ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Graphene Quantum Dots ◽  
Flow Synthesis ◽  
Synthesis Route ◽  
Hydrothermal Flow

A rapid, continuous hydrothermal flow synthesis route and life cycle assessment was employed for the synthesis of graphene quantum dots in the presence of calixarene.

scholarly journals One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 104 ◽  
Author(s):  
Rabeb El-Hnayn ◽  
Laetitia Canabady-Rochelle ◽  
Christophe Desmarets ◽  
Lavinia Balan ◽  
Hervé Rinnert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Colloidal Stability ◽  
Antioxidant Activities ◽  
Graphene Quantum Dots ◽  
Average Diameter ◽  
Functionalized Graphene ◽  
One Step ◽  
Low Cytotoxicity ◽  
Health Applications

2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

Recent Advances in the Cancer Bioimaging with Graphene Quantum Dots

2018 ◽  
Vol 25 (25) ◽  
pp. 2876-2893 ◽  
Author(s):  
Keheng Li ◽  
Xinna Zhao ◽  
Gang Wei ◽  
Zhiqiang Su
Keyword(s):  
Quantum Dots ◽  
Biomedical Applications ◽  
Cell Imaging ◽  
Graphene Quantum Dots ◽  
Biological Properties ◽  
Live Cells ◽  
Physical Chemical ◽  
Specific Cancer ◽  
Good Biocompatibility ◽  
Low Cytotoxicity

Fluorescent graphene quantum dots (GQDs) have attracted increasing interest in cancer bioimaging due to their stable photoluminescence (PL), high stability, low cytotoxicity, and good biocompatibility. In this review, we present the synthesis and chemical modification of GQDs firstly, and then introduce their unique physical, chemical, and biological properties like the absorption, PL, and cytotoxicity of GQDs. Finally and most importantly, the recent applications of GQDs in cancer bioimaging are demonstrated in detail, in which we focus on the biofunctionalization of GQDs for specific cancer cell imaging and real-time molecular imaging in live cells. We expect this work would provide valuable guides on the synthesis and modification of GQDs with adjustable properties for various biomedical applications in the future.

Free-Radical-Assisted Rapid Synthesis of Graphene Quantum Dots and Their Oxidizability Studies

Langmuir ◽  
2016 ◽  
Vol 32 (34) ◽  
pp. 8641-8649 ◽  
Author(s):  
Yan Li ◽  
Hui Liu ◽  
Xin-qian Liu ◽  
Sen Li ◽  
Lifeng Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Free Radical ◽  
Graphene Quantum Dots ◽  
Rapid Synthesis

scholarly journals Carbon-Based Quantum Dots for Electrochemical Detection of Monoamine Neurotransmitters—Review

Biosensors ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 162
Author(s):  
Saheed E. Elugoke ◽  
Abolanle S. Adekunle ◽  
Omolola E. Fayemi ◽  
Bhekie B. Mamba ◽  
El-Sayed M. Sherif ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Good Sensitivity ◽  
Health Issues ◽  
Monoamine Neurotransmitters ◽  
Good Electrocatalytic Activity ◽  
Low Cytotoxicity ◽  
Made In ◽  
Carbon Based

Imbalance in the levels of monoamine neurotransmitters have manifested in severe health issues. Electrochemical sensors have been designed for their determination, with good sensitivity recorded. Carbon-based quantum dots have proven to be an important component of electrochemical sensors due to their high conductivity, low cytotoxicity and opto-electronic properties. The quest for more sensitive electrodes with cheaper materials led to the development of electrochemical sensors based on carbon-based quantum dots for the detection of neurotransmitters. The importance of monoamine neurotransmitters (NTs) and the good electrocatalytic activity of carbon and graphene quantum dots (CQDs and GQDs) make the review of the efforts made in the design of such sensors for monoamine NTs of huge necessity. The differences and the similarities between these two quantum dots are highlighted prior to a discussion of their application in electrochemical sensors over the last ten years. Compared to other monoamine NTs, dopamine (DA) was the most studied with GQDs and CQD-based electrochemical sensors.

scholarly journals Continuous hydrothermal flow synthesis of blue-luminescent, excitation-independent nitrogen-doped carbon quantum dots as nanosensors

2020 ◽  
Vol 8 (6) ◽  
pp. 3270-3279 ◽  
Author(s):  
Ioan-Alexandru Baragau ◽  
Nicholas P. Power ◽  
David J. Morgan ◽  
Tobias Heil ◽  
Richard Alvarez Lobo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
High Selectivity ◽  
Carbon Quantum Dots ◽  
Environmental Applications ◽  
Flow Synthesis ◽  
First Report ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Hydrothermal Flow

We present the first report of continuous hydrothermal flow synthesis of N-doped carbon quantum dots, with excitation-independent optical properties. They display high selectivity and sensitivity for Cr(vi), and are thus suitable for environmental applications and beyond.

Graphene quantum dots for the inhibition of β amyloid aggregation

Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 19060-19065 ◽  
Author(s):  
Yibiao Liu ◽  
Li-Ping Xu ◽  
Wenhao Dai ◽  
Haifeng Dong ◽  
Yongqiang Wen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Amyloid Aggregation ◽  
Aβ Peptides ◽  
Β Amyloid ◽  
Low Cytotoxicity

GQDs, efficient and low-cytotoxicity inhibitors, are reported for their application in inhibiting the aggregation of Aβ peptides.

Environmentally benign synthesis of fluorescent carbon nanodots using waste PET bottle: Highly selective and sensitive detection of Pb2+ ions in aqueous medium

2021 ◽  
Author(s):  
Arnab Ghosh ◽  
Gopal Das
Keyword(s):  
Aqueous Medium ◽  
Polyethylene Terephthalate ◽  
Environmentally Benign ◽  
Carbon Nanodots ◽  
Pet Bottles ◽  
Benign Synthesis ◽  
Waste Polyethylene ◽  
Green Fluorescent ◽  
Fluorescent Carbon Nanodots ◽  
Fluorescent Carbon

Sustainable recycling and safe disposal of waste polyethylene terephthalate (PET) is a growing concern worldwide. In this work, we have synthesized green fluorescent carbon nanodots (CDs) utilizing waste PET bottles...

High-Purity Amino-Functionalized Graphene Quantum Dots Derived from Graphene Hydrogel

NANO ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. 1650138 ◽  
Author(s):  
Yinhua Jin ◽  
Hongyi Qin ◽  
Jang Ah Kim ◽  
Sun-Young Kim ◽  
Hyeong-U Kim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Purity ◽  
Hydrothermal Reaction ◽  
Graphene Quantum Dots ◽  
Synthesis Method ◽  
Water Soluble ◽  
Synthesis Process ◽  
Functionalized Graphene ◽  
Ultrasonic Probe ◽  
Low Cytotoxicity

The unique properties of graphene quantum dots (GQDs) make them interesting candidate materials for innovative applications. Herein, we report a facile method to synthesize amino-functionalized graphene quantum dots (AF-GQDs) by a hydrothermal reaction. Graphene oxide (GO) was synthesized by Hummer’s method where ultra-small GO sheets were obtained by a prolonged oxidation process followed by sonication using an ultrasonic probe. Subsequently, graphene hydrogel (GH) was also obtained by a hydrothermal synthesis method. Proper care was taken during synthesis to avoid contamination from water soluble impurities, which are present in the precursor, GO solution. Following the treatment of GH in ammonia, ultra-small amino-functionalized graphene fragments (AF-GQDs) were formed, which detached from the GH to eventually disperse evenly in the water without agglomerating. This modified synthesis process enables the formation of high-purity AF-GQDs (99.14%) while avoiding time-consuming synthesis procedures. Our finding shows that AF-GQDs with sizes less than 5[Formula: see text]nm were well dispersed. A strong photoluminescence (PL) emission at [Formula: see text]410[Formula: see text]nm with 10% PL quantum yield was also observed. These AF-GQDs can be used in many bio applications in view of their low cytotoxicity and strong fluorescence that can be applied to cell imaging.

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