scholarly journals High voltage electrochemical exfoliation of graphite for high-yield graphene production

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 29305-29311 ◽  
Author(s):  
Sarah Roscher ◽  
René Hoffmann ◽  
Mario Prescher ◽  
Peter Knittel ◽  
Oliver Ambacher
Keyword(s):  
High Voltage ◽  
Single Step ◽  
High Yield ◽  
Natural Graphite ◽  
Electrochemical Exfoliation ◽  
Layer Graphene ◽  
Highly Efficient ◽  
Graphene Production ◽  
Few Layer Graphene

We demonstrate a highly efficient, single-step, cathodic exfoliation process of graphite to produce single- to few-layer graphene with a yield of over 70% from natural graphite flakes.

scholarly journals Few-layer-graphene with high yield and low sheet resistance via mild oxidation of natural graphite

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35717-35723 ◽  
Author(s):  
S. Kim ◽  
J. Y. Lee ◽  
T. H. Yoon
Keyword(s):  
Sheet Resistance ◽  
Oxidation Time ◽  
Oxidation Temperature ◽  
High Yield ◽  
Mild Oxidation ◽  
Natural Graphite ◽  
Hummers Method ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Modified Hummers Method

The mild oxidation of natural graphite was obtained via the modified Hummers method by employing an oxidation temperature of 20 °C and KMnO4 loading of 2 g, while varying the oxidation time from 30 to 60, 90 or 120 min.

scholarly journals Preparation of Few-Layer Graphene/Carbon Nanotube Hybrids Using Oxide Spinel Catalysts

2019 ◽  
Vol 5 (2) ◽  
pp. 28 ◽  
Author(s):  
Bruno F. Machado ◽  
Revathi R. Bacsa ◽  
Camila Rivera-Cárcamo ◽  
Philippe Serp
Keyword(s):  
Hybrid Materials ◽  
Large Scale ◽  
Fixed Bed ◽  
Chemical Vapor ◽  
Single Step ◽  
Fixed Bed Reactor ◽  
High Yield ◽  
Layer Graphene ◽  
Cvd Synthesis ◽  
Few Layer Graphene

Functional 3D materials can be developed from graphene-based hybrids by introducing other nanomaterials, with multi-walled carbon nanotubes (CNTs) being the most studied additive. For large-scale applications, few-layer graphene (FLG)-CNT hybrids are produced by catalytic chemical vapor deposition (c-CVD) starting from a mixture of catalysts (one for FLG and one for CNTs) in the required proportions. Due to the difference in growth kinetics between CNTs and FLG, the composition of such hybrids is not well controlled. In this study, we report the single-step preparation of FLG-CNT hybrid materials by a fixed-bed c-CVD process using a single catalyst with the formula AlxCo1−xFe2O4 (x = 0.025–0.10). Different catalysts (with varying x) were prepared by the citrate–nitrate gel combustion method. Then, c-CVD synthesis was carried out at 650 °C in a horizontal fixed-bed reactor using ethylene as the carbon source. Only FLG was obtained when using CoFe2O4. However, the introduction of small amounts of Al (x < 0.05) induced the simultaneous production of CNTs, leading to the formation of uniform FLG-CNT hybrids. For catalysts with higher Al content (e.g., AlCoFeO4), CNTs were selectively produced. Thus, we observed the existence of a narrow Al-doping window, where CNTs and FLG can be obtained simultaneously. Our results can pave the way to developing high-yield single catalyst-based CVD synthesis of FLG-CNT hybrid materials.

Production of few-layer graphene structures in different modes of electrochemical exfoliation of graphite by voltage pulses

2019 ◽  
Vol 47 (5) ◽  
pp. 535-544 ◽  
Author(s):  
A. G. Krivenko ◽  
R. A. Manzhos ◽  
A. S. Kotkin ◽  
V. K. Kochergin ◽  
N. P. Piven ◽  
...  
Keyword(s):  
Electrochemical Exfoliation ◽  
Layer Graphene ◽  
Voltage Pulses ◽  
Few Layer Graphene ◽  
Graphene Structures

scholarly journals High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Victor Chabot ◽  
Brian Kim ◽  
Brent Sloper ◽  
Costas Tzoganakis ◽  
Aiping Yu
Keyword(s):  
Gum Arabic ◽  
High Yield ◽  
Layer Graphene ◽  
Yield Production ◽  
Few Layer Graphene ◽  
High Yield Production

Few-layer graphene oxide with high yield via efficient surfactant-assisted exfoliation of mildly-oxidized graphite

2019 ◽  
Vol 494 ◽  
pp. 1100-1108 ◽  
Author(s):  
Yang Hu ◽  
Min Su ◽  
Xin Xie ◽  
Chunbao Sun ◽  
Jue Kou
Keyword(s):  
Graphene Oxide ◽  
High Yield ◽  
Layer Graphene ◽  
Oxidized Graphite ◽  
Few Layer Graphene ◽  
Surfactant Assisted

Synthesis of few-layer graphene-like sheets from carbon-based powders via electrochemical exfoliation, using carbon black as an example

2017 ◽  
Vol 52 (18) ◽  
pp. 11004-11013 ◽  
Author(s):  
Saad Asadullah Sharief ◽  
Rahmat Agung Susantyoko ◽  
Mayada Alhashem ◽  
Saif Almheiri
Keyword(s):  
Carbon Black ◽  
Electrochemical Exfoliation ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Carbon Based

Few-layer graphene based sponge as a highly efficient, recyclable and selective sorbent for organic solvents and oils

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53741-53748 ◽  
Author(s):  
Er-Chieh Cho ◽  
Yu-Sheng Hsiao ◽  
Kuen-Chan Lee ◽  
Jen-Hsien Huang
Keyword(s):  
Organic Solvents ◽  
Selective Sorbent ◽  
Layer Graphene ◽  
Highly Efficient ◽  
Grinding Method ◽  
Few Layer Graphene ◽  
Bulk Production

In this work, we illustrate a facile and economical strategy for the bulk production of aqueous few layer graphene (FLG) dispersions via a simple grinding method.

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