Salt-assisted direct exfoliation of graphite into high-quality, large-size, few-layer graphene sheets

Nanoscale ◽  
2013 ◽  
Vol 5 (16) ◽  
pp. 7202 ◽  
Author(s):  
Liyong Niu ◽  
Mingjian Li ◽  
Xiaoming Tao ◽  
Zhuang Xie ◽  
Xuechang Zhou ◽  
...  
Keyword(s):  
Graphene Sheets ◽  
High Quality ◽  
Layer Graphene ◽  
Large Size ◽  
Few Layer Graphene

One-step room-temperature exfoliation of graphite to 100% few-layer graphene with high quality and large size

2018 ◽  
Vol 6 (31) ◽  
pp. 8343-8348 ◽  
Author(s):  
Ting Liu ◽  
Xuesha Zhang ◽  
Mengjie Liu ◽  
Wenyu Wu ◽  
Kang Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Quality ◽  
Layer Graphene ◽  
Large Size ◽  
Chemical Exfoliation ◽  
One Step ◽  
Few Layer Graphene

A mechanistic scheme of room-temperature chemical exfoliation of graphite into graphene.

Direct exfoliation of the anode graphite of used Li-ion batteries into few-layer graphene sheets: a green and high yield route to high-quality graphene preparation

2017 ◽  
Vol 5 (12) ◽  
pp. 5880-5885 ◽  
Author(s):  
Xifan Chen ◽  
Yuanzhi Zhu ◽  
Wenchao Peng ◽  
Yang Li ◽  
GuoLiang Zhang ◽  
...  
Keyword(s):  
High Yield ◽  
Graphene Sheets ◽  
Li Ion Batteries ◽  
High Quality ◽  
Layer Graphene ◽  
Li Ion ◽  
Few Layer Graphene

High-quality graphene is efficiently prepared by the direct exfoliation of the anode graphite of used Li-ion batteries.

Synthesis of High Quality Few Layer Graphene Sheets in Large Quantities by Radio Frequency Chemical Vapor Deposition

2009 ◽  
Vol 1204 ◽  
Author(s):  
Enkeleda Dervishi ◽  
Zhongrui Li ◽  
Fumiya Watanabe ◽  
Jimmy Shyaka ◽  
Abhijit Biswas ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Radio Frequency ◽  
Vapor Deposition ◽  
Low Cost ◽  
Chemical Vapor ◽  
Graphene Sheets ◽  
Scale Production ◽  
High Quality ◽  
Layer Graphene ◽  
Few Layer Graphene

AbstractThis work reports a low-cost method for large scale production of high quality graphene via radio-frequency chemical vapor deposition. High quantities of graphene were successfully synthesized on the Fe-Co/MgO (2.5:2.5:95 wt.%) catalytic system utilizing acetylene as a hydrocarbon source at 1000 °C. The as-produced graphene sheets were purified in a single step by washing with a diluted hydrochloric acid solution under sonication. Next, they were thoroughly characterized by microscopy, spectroscopy, and X-Ray diffraction. Advanced transmission electron microscopy and atomic force microscopy analyses have indicated the formation of 3-5 layered graphene nanosheets. Thorough analyses by Raman spectroscopy were also performed demonstrating the presence of high quality and few-layer graphene samples. This low cost and highly reproducible method may be applied in a straightforward way to produce large quantities of graphene for various advanced applications.

scholarly journals Growth of Ordered Graphene Ribbons by Sublimation Epitaxy

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 449
Author(s):  
Shuxian Cai ◽  
Xingfang Liu ◽  
Xin Zheng ◽  
Zhonghua Liu
Keyword(s):  
Substrate Surface ◽  
Graphene Film ◽  
Graphene Ribbon ◽  
High Quality ◽  
Graphene Layers ◽  
Force Microscopy ◽  
Layer Graphene ◽  
Micro Raman Spectroscopy ◽  
Atomic Force ◽  
Few Layer Graphene

Ordered graphene ribbons were grown on the surface of 4° off-axis 4H-SiC wafers by sublimation epitaxy, and characterized by using scanning electron microscopy (SEM), atomic force microscopy (AFM) and micro-Raman spectroscopy (μ-Raman). SEM showed that there were gray and dark ribbons on the substrate surface, and AFM further revealed that these ordered graphene ribbons had clear stepped morphologies due to surface step-bunching. It was shown by μ-Raman that the numbers of graphene layers of these two types of regions were different. The gray region was composed of mono- or bilayer ordered graphene ribbon, while the dark region was of tri- or few-layer ribbon. Meanwhile, ribbons were all homogeneous and had a width up to 40 μm and a length up to 1000 μm, without micro defects such as grain boundaries, ridges, or mono- and few-layer graphene mixtures. The results of this study are useful for optimized growth of high-quality graphene film on silicon carbide crystal.

2D porous carbon nanosheets constructed using few-layer graphene sheets by a “medium-up” strategy for ultrahigh power-output EDLCs

2018 ◽  
Vol 6 (22) ◽  
pp. 10331-10339 ◽  
Author(s):  
Panpan Chang ◽  
Kazuki Matsumura ◽  
Jizong Zhang ◽  
Jie Qi ◽  
Chengyang Wang ◽  
...  
Keyword(s):  
Double Layer ◽  
Power Output ◽  
Porous Carbon ◽  
Electric Double Layer ◽  
Graphene Sheets ◽  
Carbon Nanosheets ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Double Layer Capacitors ◽  
Electric Double Layer Capacitors

2D porous carbon nanosheets (PCNs) occupy the foreground in the field of electric double-layer capacitors (EDLCs).

scholarly journals Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4032
Author(s):  
Lianlian Liu ◽  
Niclas Solin ◽  
Olle Inganäs
Keyword(s):  
Humic Acid ◽  
Low Cost ◽  
Graphene Sheets ◽  
Mechanochemical Method ◽  
Graphite Electrodes ◽  
Conductive Materials ◽  
Layer Graphene ◽  
Redox Active ◽  
Few Layer Graphene ◽  
Alcoholic Hydroxyl

Humic acid (HA) is a biopolymer formed from degraded plants, making it a ubiquitous, renewable, sustainable, and low cost source of biocarbon materials. HA contains abundant functional groups, such as carboxyl-, phenolic/alcoholic hydroxyl-, ketone-, and quinone/hydroquinone (Q/QH2)-groups. The presence of Q/QH2 groups makes HA redox active and, accordingly, HA is a candidate material for energy storage. However, as HA is an electronic insulator, it is essential to combine it with conductive materials in order to enable fabrication of HA electrodes. One of the lowest cost types of conductive materials that can be considered is carbon-based conductors such as graphite. Herein, we develop a facile method allowing the biocarbon to meet carbon; HA (in the form of a sodium salt) is mixed with graphite by a solvent-free mechanochemical method involving ball milling. Few-layer graphene sheets are formed and the HA/graphite mixtures can be used to fabricate HA/graphite hybrid material electrodes. These electrodes exhibit a conductivity of up to 160 S·m−1 and a discharge capacity as large as 20 mAhg−1. Our study demonstrates a novel methodology enabling scalable fabrication of low cost and sustainable organic electrodes for application as supercapacitors.

scholarly journals Oxygen-Functionalized Few-Layer Graphene Sheets as Active Catalysts for Oxidative Dehydrogenation Reactions

ChemSusChem ◽  
2013 ◽  
Vol 6 (5) ◽  
pp. 732-732
Author(s):  
Viviane Schwartz ◽  
Wujun Fu ◽  
Yu-Tung Tsai ◽  
Harry M. Meyer ◽  
Adam J. Rondinone ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Graphene Sheets ◽  
Layer Graphene ◽  
Dehydrogenation Reactions ◽  
Few Layer Graphene
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