scholarly journals Mild thermal reduction of graphene oxide as a lubrication additive for friction and wear reduction

RSC Advances ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 1766-1770 ◽  
Author(s):  
Jun Zhao ◽  
Yingru Li ◽  
Yongfu Wang ◽  
Junyuan Mao ◽  
Yongyong He ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Friction And Wear ◽  
Low Cost ◽  
Thermal Reduction ◽  
Simple Synthesis ◽  
Significant Potential ◽  
Wear Reduction ◽  
Lubrication Additive

Mildly thermal reduction of graphene oxide (MRGO) offers significant potential for combination between excellent lubrication ability and advantages of green, low-cost and simple synthesis operation.

scholarly journals Simple synthesis of ZnO nanoparticles on N-doped reduced graphene oxide for the electrocatalytic sensing of l-cysteine

RSC Advances ◽  
2017 ◽  
Vol 7 (56) ◽  
pp. 35004-35011 ◽  
Author(s):  
Suling Yang ◽  
Gang Li ◽  
Chen Qu ◽  
Guifang Wang ◽  
Dan Wang
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Reduced Graphene Oxide ◽  
Zno Nanoparticles ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Simple Synthesis ◽  
Zno Nanoparticle ◽  
Reduced Graphene ◽  
One Step

A new kind of ZnO nanoparticle/N-doped reduced graphene oxide nanocomposite (ZnONPs/N-rGO) was synthesized through a low temperature, low-cost and one step hydrothermal process.

scholarly journals Alkyl Titanate-Modified Graphene Oxide as Friction and Wear Reduction Additives in PAO Oil

ACS Omega ◽  
2021 ◽  
Vol 6 (5) ◽  
pp. 3840-3846
Author(s):  
Lei Zhang ◽  
Xin Sun ◽  
Xiang Liu ◽  
Yuanhua He ◽  
Yonggang Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Friction And Wear ◽  
Modified Graphene Oxide ◽  
Wear Reduction ◽  
Modified Graphene

scholarly journals Green Solid-State Chemical Reduction of Graphene Oxide Supported on a Paper Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 693
Author(s):  
Angela Longo ◽  
Mariano Palomba ◽  
Gianfranco Carotenuto
Keyword(s):  
Graphene Oxide ◽  
Solid State ◽  
Chemical Reduction ◽  
Low Cost ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Conversion Degree ◽  
Reduction Techniques ◽  
Reduction Methods ◽  
State Chemical

The reduction of graphene oxide (GO) thin films deposited on substrates is crucial to achieve a technologically useful supported graphene material. However, the well-known thermal reduction process cannot be used with thermally unstable substrates (e.g., plastics and paper), in addition photo-reduction methods are expensive and only capable of reducing the external surface. Therefore, solid-state chemical reduction techniques could become a convenient approach for the full thickness reduction of the GO layers supported on thermally unstable substrates. Here, a novel experimental procedure for quantitative reduction of GO films on paper by a green and low-cost chemical reductant (L-ascorbic acid, L-aa) is proposed. The possibility to have an effective mass transport of the reductant inside the swelled GO solid (gel-phase) deposit was ensured by spraying a reductant solution on the GO film and allowing it to reflux in a closed microenvironment at 50 °C. The GO conversion degree to reduced graphene oxide (r-GO) was evaluated by Fourier transform infrared spectroscopy (FT-IR) in attenuated total reflectance (ATR) mode and X-ray Diffraction (XRD). In addition, morphology and wettability of GO deposits, before and after reduction, were confirmed by digital USB microscopy, scanning electron microscopy (SEM), and contact angle measurements. According to these structural characterizations, the proposed method allows a bulky reduction of the coating but leaves to a GO layer at the interface, that is essential for a good coating-substrate adhesion and this special characteristic is useful for industrial exploitation of the material.

X-Ray Diffraction Evaluation of the Average Number of Layers in Thermal Reduced Graphene Powder for Supercapacitor Nanomaterial

2019 ◽  
Vol 958 ◽  
pp. 117-122 ◽  
Author(s):  
Quezia de Aguiar Cardoso ◽  
Julio César Serafim Casini ◽  
Luzinete Pereira Barbosa ◽  
Marilene Morelli Serna ◽  
Eguiberto Galego ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Thermal Treatment ◽  
Low Cost ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Processing Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphene Layers ◽  
Number Of Layers

Graphene oxide (GO) can be partially reduced to graphene-like sheets by removing the oxygen-containing groups and recovering the conjugated structure. In this work, the thermal reduction of GO powder has been carried out using back pumping vacuum pressures and investigated employing X-ray diffraction analysis. The experimental results of estimating the number of graphene layers on the reduced powder at various temperatures (200 – 1000 °C) have been reported. Electrical changes have been produced in a graphene oxide with the vacuum reduction process. This study has shown that the ideal processing temperature for reducing graphene oxide nanomaterial was about 400 °C. It has also been shown that at 600 °C the number of layers in the reduced nanomaterial increased. The internal series equivalent resistance (ESR) has been improved substantially with the vacuum thermal treatment even at temperatures above 400 °C. ESR was reduced from 95.0 to about 13.8 Ω cm2 with this processing. These results showed that the process can be applied to the reduction of graphene oxide to produce supercapacitor nanomaterials. The advantage of employing this method is that the processing is a straightforward and low cost thermal treatment that might be used for large amount of nanocomposite material.

scholarly journals Conductive Nanofilms with Oppositely Charged Reduced Graphene Oxides as a Base for Electroactive Coatings and Sensors

2021 ◽  
Vol 5 (2) ◽  
pp. 20
Author(s):  
Tomasz Kruk ◽  
Piotr Warszyński
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Low Cost ◽  
Thermal Reduction ◽  
Layer By Layer ◽  
Graphene Oxides ◽  
Lbl Assembly ◽  
Reduced Graphene ◽  
Amidation Reaction ◽  
Oppositely Charged

We demonstrate a method for the formation of multilayers composed of reduced graphene oxide (rGO), which can be used for transparent, conducting thin films. Using the layer-by-layer (LbL) assembly of positively and negatively charged GO sheets, we could obtain thin films with highly controllable sheet resistance. The natural negative charge of graphene oxide was turned to positive by the amidation reaction. After forming the multilayer films, the graphene oxide underwent thermal reduction at temperatures above 150 °C. The (rGO+/rGO−) films were characterized by UV-Vis and scanning electron microscopy (SEM), and their conductivity was measured by the four-point method. We found that after deposition of five (rGO+/rGO−), the coating structure reached the percolation limit, and the film resistance decreased more gradually to around 20 kΩ/sq for the films obtained by eleven deposition cycles with graphene oxide reduced at 250 °C. The formation of thin films on polyimide allows the forming of new flexible conductive materials, which can find applications, e.g., in biomedicine as new electroactive, low-cost, disposable sensors.

Alkyl phosphate modified graphene oxide as friction and wear reduction additives in oil

2018 ◽  
Vol 54 (6) ◽  
pp. 4626-4636 ◽  
Author(s):  
Lei Zhang ◽  
Yi He ◽  
Lin Zhu ◽  
Zhilin Jiao ◽  
Weizhou Deng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Friction And Wear ◽  
Modified Graphene Oxide ◽  
Alkyl Phosphate ◽  
Wear Reduction ◽  
Modified Graphene

Synthesis of Cu/rGO composites by chemical and thermal reduction of graphene oxide

2019 ◽  
Vol 800 ◽  
pp. 379-391 ◽  
Author(s):  
P. Vázquez-Sánchez ◽  
M.A. Rodríguez-Escudero ◽  
F.J. Burgos ◽  
I. Llorente ◽  
O. Caballero-Calero ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Thermal Reduction

scholarly journals Photocatalytic reduction of graphene oxide with cuprous oxide film under UV-vis irradiation

2020 ◽  
Vol 59 (1) ◽  
pp. 207-214 ◽  
Author(s):  
Yao Wang ◽  
Jianqing Feng ◽  
Lihua Jin ◽  
Chengshan Li
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Photocatalytic Reduction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene ◽  
Reduction Efficiency ◽  
Metal Organic ◽  
Reduction Effect

AbstractWe have grown Cu2O films by different routes including self-oxidation and metal-organic deposition (MOD). The reduction efficiency of Cu2O films on graphene oxide (GO) synthesized by modified Hummer’s method has been studied. Surface morphology and chemical state of as-prepared Cu2O film and GO sheets reduced at different conditions have also been investigated using atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Results show that self-oxidation Cu2O film is more effective on phtocatalytic reduction of GO than MOD-Cu2O film. Moreover, reduction effect of self-oxidation Cu2O film to GO is comparable to that of environmental-friendly reducing agent of vitamin C. The present results offer a potentially eco-friendly and low-cost approach for the manufacture of reduced graphene oxide (RGO) by photocatalytic reduction.

Sign in / Sign up

Export Citation Format

Share Document