Tunable degree of oxidation through variation of H2O2 concentration and its effect on structural, optical and supercapacitive properties of graphene oxide powders synthesized using improved method

2017 ◽  
Vol 13 ◽  
pp. 26-35 ◽  
Author(s):  
Sumeet Kumar ◽  
Bhagyalakhi Baruah ◽  
Ashok Kumar
Keyword(s):  
Graphene Oxide ◽  
H2o2 Concentration ◽  
Improved Method ◽  
Oxide Powders ◽  
Degree Of Oxidation

scholarly journals The Degree of Oxidation of Graphene Oxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 560
Author(s):  
Alexandra Carvalho ◽  
Mariana C. F. Costa ◽  
Valeria S. Marangoni ◽  
Pei Rou Ng ◽  
Thi Le Hang Nguyen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ab Initio ◽  
State Of The Art ◽  
High Accuracy ◽  
Precise Determination ◽  
Photoemission Spectroscopy ◽  
Pristine Graphene ◽  
X Ray ◽  
Degree Of Oxidation

We show that the degree of oxidation of graphene oxide (GO) can be obtained by using a combination of state-of-the-art ab initio computational modeling and X-ray photoemission spectroscopy (XPS). We show that the shift of the XPS C1s peak relative to pristine graphene, ΔEC1s, can be described with high accuracy by ΔEC1s=A(cO−cl)2+E0, where c0 is the oxygen concentration, A=52.3 eV, cl=0.122, and E0=1.22 eV. Our results demonstrate a precise determination of the oxygen content of GO samples.

Unravelling Some of the Structure–Property Relationships in Graphene Oxide at Low Degree of Oxidation

2018 ◽  
Vol 9 (7) ◽  
pp. 1746-1749 ◽  
Author(s):  
Filippo Savazzi ◽  
Francesca Risplendi ◽  
Giuseppe Mallia ◽  
Nicholas M. Harrison ◽  
Giancarlo Cicero
Keyword(s):  
Graphene Oxide ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Low Degree ◽  
Degree Of Oxidation

scholarly journals Effect of the degree of oxidation of graphene oxide on As(III) adsorption

2020 ◽  
Vol 384 ◽  
pp. 121440 ◽  
Author(s):  
A.C. Reynosa-Martínez ◽  
G. Navarro Tovar ◽  
W.R. Gallegos ◽  
H. Rodríguez-Meléndez ◽  
R. Torres-Cadena ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Degree Of Oxidation

An improved method to synthesize nanoscale graphene oxide using much less acid

2019 ◽  
Vol 9 ◽  
pp. 100097 ◽  
Author(s):  
D. Luo ◽  
F. Zhang ◽  
Z. Ren ◽  
W. Ren ◽  
L. Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Improved Method

Preparation of Graphene Oxide Based on Expanded Graphite

2014 ◽  
Vol 881-883 ◽  
pp. 1083-1088 ◽  
Author(s):  
Li Lai Liu ◽  
Mao Zhong An ◽  
Shan Chao Xing ◽  
Xiao Jun Shen ◽  
Chen Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electron Microscope ◽  
High Temperature ◽  
Expanded Graphite ◽  
Oxidation Time ◽  
Flake Graphite ◽  
Temperature Reaction ◽  
High Temperature Reaction ◽  
Degree Of Oxidation ◽  
High Degree

Graphene oxide with high degree of oxidation and peelable has been prepared by two-step oxidation method used large flake graphite. The expanded graphite was prepared firstly and then prepared graphene oxide via further oxidation. The influence of oxidation time, oxidant dosage and high temperature reaction on the structure and degree of oxidation were studied. The morphology and structure of graphene oxide were characterized by X-ray diffraction, fourier transform infrared spectra, scanning electron microscope and transmission electron microscope. It was found that high degree of oxidation and large specific surface area graphene oxide was prepared at the ratio of sulfuric acid and expanded graphite was 75 mL : 1 g, the ratio of potassium permanganate and expanded graphite was 4 g : 1 g and the oxidation time at 35 °C was 24 h. This technology is simple without high-temperature reaction process, and solved the problem of low oxidation efficiency when used the large flake graphite as raw materials.

scholarly journals Electrical Measurements of Thermally Reduced Graphene Oxide Powders under Pressure

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1387 ◽  
Author(s):  
Hyunsoo Park ◽  
Soomook Lim ◽  
Dang Du Nguyen ◽  
Ji Won Suk
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Applied Pressure ◽  
Thermal Reduction ◽  
Electrical Measurements ◽  
Oxide Powders ◽  
Bulk Electrical Conductivity ◽  
Reduced Graphene

Graphene powders obtained via the reduction of graphene oxide flakes have been widely used in various applications as they can be synthesized in large quantities with outstanding properties. The electrical conductivity of graphene powders is critical for their uses in fabricating high-performance devices or materials. Here, we investigated the bulk electrical conductivity of reduced graphene oxide (rGO) powders depending on the applied pressure and additional thermal annealing. The electrical conductivity of the rGO powders was correlated with the change in the carbon-to-oxygen ratio via additional thermal reduction. Furthermore, the effect of the morphology of the rGO powders was studied through electromechanical measurements. This study provides a reliable method for the electromechanical characterization of rGO powders and a better understanding of the electrical conductivity of graphene-based materials.

In situ growth of Au nanocrystals on graphene oxide sheets

Nanoscale ◽  
2014 ◽  
Vol 6 (3) ◽  
pp. 1281-1285 ◽  
Author(s):  
Yong Qin ◽  
Juan Li ◽  
Yong Kong ◽  
Xiazhang Li ◽  
Yongxin Tao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxide Surface ◽  
In Situ Growth ◽  
Degree Of Oxidation ◽  
Graphene Oxide Sheets

The morphology of Au nanocrystals decorated on graphene oxide can be tailored by the degree of oxidation on the graphene oxide surface.

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