Reduction of graphene oxide and graphene quantum dots using nascent hydrogen: The investigation of morphological and structural changes

AbstractIn order to modify both chemical and electrical properties of graphene-based nanomaterials, we conducted the chemical modification of graphene oxide (GO) and graphene quantum dots (GQDs). The reaction of the reduction with nascent hydrogen was conducted on both materials. The structure and morphology of produced chemically reduced GO and GQDs were analyzed. While the chemical composition of both GQD and GO changed significantly, GO showed also significant changes in morphology as opposite to GQDs where were morphological changes were not observed.

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NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

New Journal of Chemistry ◽

10.1039/d1nj00621e ◽

2021 ◽

Author(s):

Xu Dan ◽

Ruiyi Li ◽

Qinsheng Wang ◽

Yongqiang Yang ◽

Haiyan Zhu ◽

...

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Catalytic Activity ◽

Quantum Dot ◽

Colorimetric Detection ◽

Graphene Quantum Dots ◽

Functionalized Graphene ◽

Graphene Quantum Dot ◽

Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

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Synthesis of graphene oxide and graphene quantum dots from miscanthus via ultrasound-assisted mechano-chemical cracking method

Ultrasonics Sonochemistry ◽

10.1016/j.ultsonch.2021.105519 ◽

2021 ◽

Vol 73 ◽

pp. 105519

Author(s):

Yuxin Yan ◽

Sivakumar Manickam ◽

Edward Lester ◽

Tao Wu ◽

Cheng Heng Pang

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Graphene Quantum Dots ◽

Ultrasound Assisted

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Electrochemical Trimming of Graphene Oxide Affords Graphene Quantum Dots for Fe3+ Detection

ACS Applied Nano Materials ◽

10.1021/acsanm.1c00621 ◽

2021 ◽

Author(s):

Ruibin Qiang ◽

Weiming Sun ◽

Kaiming Hou ◽

Zhangpeng Li ◽

Jinyun Zhang ◽

...

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Graphene Quantum Dots

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Composition and Structure of Fluorescent Graphene Quantum Dots Generated by Enzymatic Degradation of Graphene Oxide

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.1c01564 ◽

2021 ◽

Author(s):

Xiaoyun He ◽

Dan C. Sorescu ◽

Alexander Star

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Enzymatic Degradation ◽

Graphene Quantum Dots ◽

Composition And Structure

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Composites of Graphene Quantum Dots and Reduced Graphene Oxide as Catalysts for Nitroarene Reduction

ACS Omega ◽

10.1021/acsomega.7b00908 ◽

2017 ◽

Vol 2 (10) ◽

pp. 7293-7298 ◽

Cited By ~ 13

Author(s):

Jiali Zhang ◽

Fangwei Zhang ◽

Yaoyao Yang ◽

Shouwu Guo ◽

Jingyan Zhang

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Graphene Quantum Dots ◽

Reduced Graphene ◽

Nitroarene Reduction

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Facile and simultaneous synthesis of graphene quantum dots and reduced graphene oxide for bio-imaging and supercapacitor applications

New Journal of Chemistry ◽

10.1039/c6nj00586a ◽

2016 ◽

Vol 40 (11) ◽

pp. 9111-9124 ◽

Cited By ~ 27

Author(s):

A. Muthurasu ◽

P. Dhandapani ◽

V. Ganesh

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Graphene Quantum Dots ◽

Reduced Graphene ◽

Bio Imaging ◽

Simultaneous Synthesis ◽

Supercapacitor Applications

A simple and facile method for the simultaneous preparation of graphene quantum dots (GQDs) having different emission colours, viz., yellow, green and blue, and reduced graphene oxide (RGO) utilized respectively for bio-imaging and supercapacitor applications is demonstrated.

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Synthesis, Photoluminescence and Bio-Targeting Applications of Blue Graphene Quantum Dots

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2016.11817 ◽

2016 ◽

Vol 16 (4) ◽

pp. 3457-3467 ◽

Cited By ~ 4

Author(s):

Jigang Wang ◽

Ji Zhou ◽

Wenhua Zhou ◽

Jilong Shi ◽

Lun Ma ◽

...

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Sodium Hydroxide ◽

Heating Temperature ◽

Thin Sheet ◽

Graphene Quantum Dots ◽

Photoluminescence Intensity ◽

Cytotoxic Effects ◽

Different Temperatures ◽

Blue Photoluminescence

Chemical derived graphene oxide, an atomically thin sheet of graphite with two-dimensional construction, offers interesting physical, electronic, thermal, chemical, and mechanical properties that are currently being explored for advanced physics electronics, membranes, and composites. Herein, we study graphene quantum dots (GQD) with the blue photoluminescence under various parameters. The GQD samples were prepared at different temperatures, and the blue photoluminescence intensity of the solution improved radically as the heating temperatures increased. Concerning PL peak and intensity of the quantum dots, the results demonstrated dependence on time under heating, temperature of heating, and pH adjusted by the addition of sodium hydroxide. After hydrothermal synthesis routes, the functional groups of graphene oxide were altered the morphology showed the stacking configuration, and self-assembled structure of the graphene sheets with obvious wrinkles appeared at the edge structures. In addition, absorption, PL, and PLE spectra of the graphene quantum dots increase with different quantities of sodium hydroxide added. Finally, using GQD to target PNTIA cells was carried out successfully. High uptake efficiency and no cytotoxic effects indicate graphene quantum dots can be suitable for bio-targeting.

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Graphene quantum dots supported by graphene oxide as a sensitive fluorescence nanosensor for cytochrome c detection and intracellular imaging

Journal of Materials Chemistry B ◽

10.1039/c7tb01629h ◽

2017 ◽

Vol 5 (31) ◽

pp. 6300-6306 ◽

Cited By ~ 13

Author(s):

Lin Cao ◽

Xiangqing Li ◽

Lixia Qin ◽

Shi-Zhao Kang ◽

Guodong Li

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Cytochrome C ◽

Graphene Quantum Dots ◽

A549 Cells ◽

High Sensitivity ◽

Fluorescence Sensor ◽

Intracellular Imaging ◽

New Class ◽

Sensitivity And Selectivity

A new class of Cyt c detection fluorescence sensor based on graphene quantum dots supported by graphene oxide has been facilely developed. The sensor shows a high sensitivity and selectivity for Cyt c detection, and further exhibits favorable intracellular imaging in A549 cells.

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

Nanomaterials ◽

10.3390/nano10010104 ◽

2020 ◽

Vol 10 (1) ◽

pp. 104 ◽

Cited By ~ 9

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.

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