scholarly journals Electrochemical Method To Prepare Graphene Quantum Dots and Graphene Oxide Quantum Dots

ACS Omega ◽  
2017 ◽  
Vol 2 (11) ◽  
pp. 8343-8353 ◽  
Author(s):  
Satyaprakash Ahirwar ◽  
Sudhanshu Mallick ◽  
Dhirendra Bahadur
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Electrochemical Method ◽  
Graphene Quantum Dots ◽  
Graphene Oxide Quantum Dots

scholarly journals Transforming Carbon Black into Graphene Oxide Quantum Dots by Pulsed Laser Ablation in Ethanol

2020 ◽  
Vol 58 (11) ◽  
pp. 808-814
Author(s):  
Jung-Il Lee ◽  
Jeong Ho Ryu
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Laser Ablation ◽  
Carbon Black ◽  
Graphene Quantum Dots ◽  
Pulsed Laser ◽  
Blue Emission ◽  
Pulsed Laser Ablation ◽  
Absorption Bands ◽  
Graphene Oxide Quantum Dots

Graphene oxide quantum dots (GOQDs) are nanometer-sized graphene oxide fragments that exhibit unique properties, making them interesting candidates for a range of new applications. Carbon black, one of the commercially available carbon precursors, is produced by the thermal decomposition or incomplete combustion of organic compounds. It is commonly used as a supporting material for catalysts because of its excellent electrical conductivity, high surface area, and stability. In this paper, we report the transformation of carbon black into GOQDs in 10 min using a one-step facile approach. This transformation was achieved by pulsed laser ablation (PLA) in ethanol using the earth-abundant and low-cost carbon black as precursor. Only ethanol and carbon black were used for the transformation. The carbon clusters ablated from the carbon black were completely transformed into GOQDs with a homogeneous size distribution and heights in the range of 0.3-1.7 nm. This confirmed that the transformed GOQDs consisted of only single- or few-layered graphene quantum dots. The UV-vis spectra showed absorption bands at 215, 260, and 320 nm, which were attributed to the π→π* transition of the C=C of the sp<sup>2</sup> C bond in the sp<sup>3</sup> C matrix. A distinct blue emission peak at 450 nm was evident at an excitation wavelength of 360 nm. The broader PL emission spectra are due to the oxygen-related functional groups emitting PL between 300 and 440 nm.

Multiple doping of graphene oxide foams and quantum dots: new switchable systems for oxygen reduction and water remediation

2015 ◽  
Vol 3 (27) ◽  
pp. 14334-14347 ◽  
Author(s):  
M. Favaro ◽  
F. Carraro ◽  
M. Cattelan ◽  
L. Colazzo ◽  
C. Durante ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Oxygen Reduction ◽  
Electrochemical Method ◽  
Three Dimensional ◽  
Environmentally Friendly ◽  
Water Remediation ◽  
Doped Graphene ◽  
Graphene Oxide Quantum Dots ◽  
Boron Nitrogen

Single- and multi-boron, nitrogen, sulphur doped graphene oxide quantum dots and three-dimensional foams are synthesized by a simple and environmentally friendly electrochemical method.

Graphene quantum dots from fishbone carbon nanofibers

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 48504-48514 ◽  
Author(s):  
D. Torres ◽  
J. L. Pinilla ◽  
E. M. Gálvez ◽  
I. Suelves
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Carbon Nanofibers ◽  
Graphene Quantum Dots ◽  
Differential Centrifugation ◽  
Graphene Oxide Quantum Dots

Photoluminescent graphene oxide quantum dots (GOQD) obtained from chemically oxidized fishbone carbon nanofibers (CNF) and separated by degressive differential centrifugation.

Facile Synthetic Method for Pristine Graphene Quantum Dots and Graphene Oxide Quantum Dots: Origin of Blue and Green Luminescence

2013 ◽  
Vol 25 (27) ◽  
pp. 3657-3662 ◽  
Author(s):  
Fei Liu ◽  
Min-Ho Jang ◽  
Hyun Dong Ha ◽  
Je-Hyung Kim ◽  
Yong-Hoon Cho ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Graphene Quantum Dots ◽  
Pristine Graphene ◽  
Synthetic Method ◽  
Green Luminescence ◽  
Graphene Oxide Quantum Dots

scholarly journals Detection of Heavy Metals in Water Using Graphene Oxide Quantum Dots: An Experimental and Theoretical Study

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5519
Author(s):  
Lorenzo Gontrani ◽  
Olivia Pulci ◽  
Marilena Carbone ◽  
Roberto Pizzoferrato ◽  
Paolo Prosposito
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Graphene Oxide ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Theoretical Study ◽  
Graphene Quantum Dots ◽  
Emission Spectra ◽  
Optical Response ◽  
Graphene Oxide Quantum Dots

In this work, we investigate by ab initio calculations and optical experiments the sensitivity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two cases of opposite behaviour are considered in detail: Cd2+, where we observe an increase in the emission optical response for increasing concentration, and Pb2+ whose emission spectra, vice versa, are quenched along the concentration rise. The experimental trends reported comply nicely with the different hydration patterns suggested by the models that are also capable of reproducing the minor quenching/enhancing effects observed in other ions. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water.

scholarly journals Simple preparation of graphene quantum dots with controllable surface states from graphite

RSC Advances ◽  
2019 ◽  
Vol 9 (66) ◽  
pp. 38447-38453 ◽  
Author(s):  
Sukhyun Kang ◽  
Young Kyu Jeong ◽  
Kyung Hwan Jung ◽  
Yong Son ◽  
Sung-Churl Choi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Graphene Quantum Dots ◽  
Pulsed Laser ◽  
Surface States ◽  
Pulsed Laser Ablation ◽  
Ablation Process ◽  
Laser Ablation Process ◽  
Simple Preparation ◽  
Graphene Oxide Quantum Dots

The proposed technique enables selectively producing graphene quantum dots (on-GQDs) and graphene oxide quantum dots (off-GOQDs) by depending on the applying sonication during the pulsed laser ablation process.

Aggregation-induced enhanced photoluminescence in magnetic graphene oxide quantum dots as a fluorescence probe for As(iii) sensing

2019 ◽  
Vol 7 (14) ◽  
pp. 8510-8520 ◽  
Author(s):  
Shabnam Pathan ◽  
Misna Jalal ◽  
Sanjay Prasad ◽  
Suryasarathi Bose
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Fluorescence Probe ◽  
Graphene Quantum Dots ◽  
Contaminated Water ◽  
Magnetic Graphene Oxide ◽  
Enhanced Photoluminescence ◽  
Magnetic Graphene ◽  
Water Based ◽  
Graphene Oxide Quantum Dots

Magnetic graphene quantum dots have been designed for sensing arsenic in contaminated water based on aggregation induced photoluminescence phenomenon.

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