scholarly journals Preparation of Single- and Few-Layer Graphene Sheets Using Co Deposition on SiC Substrate

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Cun Li ◽  
Dandan Li ◽  
Jingjing Yang ◽  
Xiaopeng Zeng ◽  
Wenxia Yuan
Keyword(s):  
Carbon Diffusion ◽  
Product Layer ◽  
Graphene Sheets ◽  
Cooling Process ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Highly Sensitive ◽  
Selective Chemical ◽  
Few Layer Graphene ◽  
Cobalt Silicides

Single- and few-layer graphene sheets were fabricated by selective chemical reactions between Co film and SiC substrate. A rapid cooling process was employed. The number of layers and crystallinity of graphene sheets were controlled by process parameters. The formation mechanism of graphene was highly sensitive to carbon diffusion. Free carbon precipitated and then moved across the product layer that was composed mainly of cobalt-silicides. The graphene layer formed homogeneously on the surface and then transferred to the other substrate. This could provide a method for high-quality fabrication of wafer-sized graphene sheets.

The influence of nanoscale roughness and substrate chemistry on the frictional properties of single and few layer graphene

Nanoscale ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 10021-10029 ◽  
Author(s):  
Jessica C. Spear ◽  
James P. Custer ◽  
James D. Batteas
Keyword(s):  
Rough Surfaces ◽  
Frictional Properties ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Few Layer Graphene ◽  
Nanoscale Roughness

Graphene's lack of conformity to rough surfaces impacts its frictional properties, depending on the number of layers and substrate bonding.

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

A facile and fast electrochemical route to produce functional few-layer graphene sheets for lithium battery anode application

2014 ◽  
Vol 2 (37) ◽  
pp. 15298-15302 ◽  
Author(s):  
Farid Ouhib ◽  
Abdelhafid Aqil ◽  
Jean-Michel Thomassin ◽  
Cédric Malherbe ◽  
Bernard Gilbert ◽  
...  
Keyword(s):  
Lithium Battery ◽  
Simple Approach ◽  
Graphene Sheets ◽  
Functionalized Graphene ◽  
Li Ion Battery ◽  
Layer Graphene ◽  
Li Ion ◽  
Few Layer Graphene ◽  
Battery Anode

We report a simple approach for the production of polymer functionalized graphene for Li-ion battery anodes.

scholarly journals Preparation of Colloidal Dispersions of Graphene Sheets in Organic Solvents by Using Ball Milling

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Weifeng Zhao ◽  
Furong Wu ◽  
Hang Wu ◽  
Guohua Chen
Keyword(s):  
Organic Solvents ◽  
Colloidal Suspension ◽  
Colloidal Dispersions ◽  
Graphene Sheets ◽  
Graphite Nanosheets ◽  
Force Microscopy ◽  
Layer Graphene ◽  
Atomic Force ◽  
Transmission Electron ◽  
Few Layer Graphene

A top-down method was developed for producing colloidal dispersions of graphene sheets. Graphite nanosheets comprising hundreds of carbon layers were dispersed and gently ball-milled to exfoliate into graphene in a variety of organic solvents. After 30 hours of the shear-force-dominated grinding and a subsequent 4000 r.p.m. of centrifugation, single- and few-layer graphene sheets were readily prepared and homogeneously and stably suspended in the good solvent medium which possesses a surface tension value close to 40 mJm−2, such as inN,N-dimethylformamide, at a concentration up to 0.08 mg ml−1, achieving a yield higher than 32.0 wt%. The graphene materials in the colloidal suspension were characterized using scanning and transmission electron microscopy and atomic force microscopy.

Sign in / Sign up

Export Citation Format

Share Document