scholarly journals Facile Synthesis of Water-Soluble Graphene Quantum Dots/Graphene for Efficient Photodetector

MRS Advances ◽  
2018 ◽  
Vol 3 (15-16) ◽  
pp. 817-824 ◽  
Author(s):  
Sanju Gupta ◽  
Jared Walden ◽  
Alexander Banaszak ◽  
Sara B. Carrizosa
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Blue Emission ◽  
Water Soluble ◽  
Monolayer Graphene ◽  
Graphene Sheets ◽  
Scale Production ◽  
Research Activity ◽  
High Efficient

ABSTRACTGraphene quantum dots (GQDs) are zero-dimensional material with characteristics derived from functionalized graphene precursors are graphene sheets a few nanometers in the lateral dimension having a several-layer thickness. Combining the structure of graphene with the quantum confinement and edge effects, GQDs possess unique chemical behavior and physical properties. Intense research activity in GQDs is attributed to their novel phenomena of charge transport and light absorption and photoluminescence excitation. The optical transitions are known to be available up to 6 eV in GQDs, applicable for ultraviolet photonics and optoelectronics devices, biomedical imaging capabilities and technologies. We present facile hydrothermal and solvothermal methods for synthesizing homogenous dispersed and uniform sized GQDs with a strong greenish and violet blue emission peaks at ∼10-14% yield. This approach enabled a large-scale production of aqueous GQD dispersions without the need for chemical stabilizers. The structure and emission mechanism of the GQDs have been studied by combining extensive characterization techniques and rigorous control experiments. We further demonstrate the distinctive advantages of such GQDs as high-performance photodetectors (PDs). Here we also report high-efficient photocurrent (PC) behaviors consisting of multilayer GQDs sandwiched between monolayer graphene sheets. It is conceivable that the observed unique PD characteristics proved to be dominated by tunneling of charge carriers which occurs through the multiple energy states within the bandgap of GQDs, based on bias-dependent variation of the band profiles. This results in novel dark current and PC behaviors. The external quantum efficiency (η) is predicted to be 47% at applied potential 2 V. These findings highlight rich photophysics and comparable performance of graphene/graphene oxide hybrids opening up potential applications as optoelectronic devices.

Femtosecond laser ablation of highly oriented pyrolytic graphite: a green route for large-scale production of porous graphene and graphene quantum dots

Nanoscale ◽  
2014 ◽  
Vol 6 (4) ◽  
pp. 2381-2389 ◽  
Author(s):  
Paola Russo ◽  
Anming Hu ◽  
Giuseppe Compagnini ◽  
Walter W. Duley ◽  
Norman Y. Zhou
Keyword(s):  
Quantum Dots ◽  
Femtosecond Laser ◽  
Large Scale ◽  
Coal Gasification ◽  
Pyrolytic Graphite ◽  
Graphene Quantum Dots ◽  
Femtosecond Laser Ablation ◽  
Scale Production ◽  
Porous Graphene ◽  
Large Scale Production

Large scale production of porous graphene and graphene quantum dots through femtosecond laser exfoliation and coal gasification.

Large scale production of graphene quantum dots through the reaction of graphene oxide with sodium hypochlorite

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 54644-54648 ◽  
Author(s):  
Xuejiao Zhou ◽  
Shouwu Guo ◽  
Peng Zhong ◽  
Yong Xie ◽  
Zhimin Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Uv Irradiation ◽  
Sodium Hypochlorite ◽  
Oxygen Radicals ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Scale Production ◽  
Large Scale Production

A facile method to produce graphene quantum dots on a large scale was introduced with the usage of oxygen radicals under UV irradiation.

Solid Lipid Nanoparticles: A Promising Drug Delivery Technology

2009 ◽  
Vol 2 (2) ◽  
pp. 509-516
Author(s):  
S. Pragati ◽  
S. Kuldeep ◽  
S. Ashok ◽  
M. Satheesh
Keyword(s):  
Drug Delivery ◽  
Solid Lipid Nanoparticles ◽  
Large Scale ◽  
Colloidal Particles ◽  
Scale Up ◽  
Lipid Nanoparticles ◽  
Scale Production ◽  
Research Activity ◽  
New Approach ◽  
Solid Lipid

One of the situations in the treatment of disease is the delivery of efficacious medication of appropriate concentration to the site of action in a controlled and continual manner. Nanoparticle represents an important particulate carrier system, developed accordingly. Nanoparticles are solid colloidal particles ranging in size from 1 to 1000 nm and composed of macromolecular material. Nanoparticles could be polymeric or lipidic (SLNs). Industry estimates suggest that approximately 40% of lipophilic drug candidates fail due to solubility and formulation stability issues, prompting significant research activity in advanced lipophile delivery technologies. Solid lipid nanoparticle technology represents a promising new approach to lipophile drug delivery. Solid lipid nanoparticles (SLNs) are important advancement in this area. The bioacceptable and biodegradable nature of SLNs makes them less toxic as compared to polymeric nanoparticles. Supplemented with small size which prolongs the circulation time in blood, feasible scale up for large scale production and absence of burst effect makes them interesting candidates for study. In this present review this new approach is discussed in terms of their preparation, advantages, characterization and special features.

Facile and Large-scale Synthesis of Graphene Quantum Dots Functionalized with Morpholine for Selective Targeting and Imaging of Lysosome

NANO ◽  
2021 ◽  
pp. 2150113
Author(s):  
Yingying Nie ◽  
Zengjie Fan
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Diagnosis And Treatment ◽  
Uniform Size ◽  
Scale Method ◽  
Selective Targeting ◽  
Application Potential ◽  
Good Biocompatibility ◽  
Imaging Properties

The lack of targeting selection to lysosome limits the application of graphene quantum dots (GQDs) in the diagnosis and treatment of lysosome-related disease. In this study, we developed a facile, environmentally friendly and large-scale method to prepare [Formula: see text]-aminomorpholine (Am)-modified GQDs (Am-GQDs) via a simple hydrothermal method. The physicochemical, optical, biocompatible and targeted imaging properties were evaluated systematically. The results indicated that the synthesized Am-GQDs had a uniform size distribution and the size was around 2[Formula: see text]nm. In addition, the synthesized Am-GQDs had excellent optical properties, fluorescent stability, and good biocompatibility. More importantly, they can selectively target and image lysosome in a relatively short coculture time with cells, demonstrating their application potential in the diagnosis and treatment of lysosomal-related diseases.

Self-assembled nitrogen-doped graphene quantum dots (N-GQDs) over graphene sheets for superb electro-photocatalytic activity

2019 ◽  
Vol 480 ◽  
pp. 1035-1046 ◽  
Author(s):  
Rabia Riaz ◽  
Mumtaz Ali ◽  
Iftikhar Ali Sahito ◽  
Alvira Ayoub Arbab ◽  
T. Maiyalagan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Graphene Quantum Dots ◽  
Graphene Sheets ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Self Assembled

Large scale synthesis of graphene quantum dots (GQDs) from waste biomass and their use as an efficient and selective photoluminescence on–off–on probe for Ag+ions

Nanoscale ◽  
2014 ◽  
Vol 6 (20) ◽  
pp. 11664-11670 ◽  
Author(s):  
Anil Suryawanshi ◽  
Mandakini Biswal ◽  
Dattakumar Mhamane ◽  
Rohan Gokhale ◽  
Shankar Patil ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Waste Biomass ◽  
Large Scale Synthesis
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