Dielectric Properties of Graphene Oxide Synthesized by Modified Hummers’ Method from Graphite Powder

Graphene oxide (GO) is typically synthesized by graphite powder under strong oxidizing reaction, possessing with the same set of functional groups: epoxy and hydroxyl in basal plane and carboxyl and hydroxyl groups existence on the flake edges which endow GO with amphipathy. GO and its functionalized derivatives have been successfully tested in many domains, such as polymer composites, biosensors, drug delivery systems, etc. In this paper, GO was prepared by a modified Hummers method employing improved process (preparation and separation), aiming at industrialization with the lowest cost. Moreover, some novel functional groups with different properties were controlled chemically grafted onto GO to modify the wettability and reaction activity with other materials. The hydrophobicity and the thermal property of graphene oxide were enhanced by chemical functionalization.

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Anodic Aqueous Electrophoretic Deposition of Graphene Oxide on Copper Using Different Cathode Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1008.21 ◽

2020 ◽

Vol 1008 ◽

pp. 21-27

Author(s):

Essam Hares ◽

Ahmed Hassan El-Shazly ◽

Marwa Farouk El-Kady ◽

Kholoud Madih ◽

Hamdiya Orleans-Boham ◽

...

Keyword(s):

Graphene Oxide ◽

Electrophoretic Deposition ◽

Graphite Oxide ◽

Cathode Materials ◽

Aqueous Suspension ◽

Graphite Powder ◽

Liquid Exfoliation ◽

Hummers Method ◽

Oxide Deposition ◽

Modified Hummers Method

The effect of four different cathode materials on the anodic deposition of graphene oxide (GO) nanosheets was studied experimentally. First, synthesis of graphite oxide from graphite powder was done by modified Hummers' method. Ultrasonic technique was adopted for the preparation of the stable aqueous suspension of GO by using liquid exfoliation of graphite oxide. Deposition of GO coating on copper sheets (the anode) was done via electrophoretic deposition (EPD) at the same operating condition (5V, 2 min, concentration of 0.5 mg/ml of GO per deionized water) with different cathode materials (copper, stainless steel, aluminum and graphite). The coatings’ morphological and microstructure were investigated using scanning electron microscope (SEM) and the effect of the current density in the EPD process was obtained. The change in the deposition weight was also measured. It was ascertained that the cathode’s material is a major factor can affect the GO’s EPD process and the characteristics of the final coating.

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Obtaining of Reduced Graphene Oxide from Graphite by using Hummer’s and Chemical Reduction Method

Academic Perspective Procedia ◽

10.33793/acperpro.02.03.59 ◽

2019 ◽

Vol 2 (3) ◽

pp. 601-605

Author(s):

Kübra Yıldız ◽

Muhammet Uzun

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Reduction Method ◽

Chemical Reduction ◽

Graphite Powder ◽

Chemical Reduction Method ◽

Graphene Oxides ◽

Hummers Method ◽

Reduced Graphene ◽

Modified Hummers Method

In this study, graphene oxide (GO) was synthesized from graphite using modified Hummers method. According to other methods known in the literature, modified Hummers method; it is simpler and less costly in terms of process steps. In addition, it is safer and environmentally friendly than the Hummers method. Reduced Graphene Oxide (RGO) was obtained by reduction of graphene oxides (GO) synthesized by modified Hummers method. It is understood from the obtained results that GO is synthesized successfully from graphite powder by modified Hummers method and RGO is obtained successfully by reduction of graphene oxides (GO).

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Graphene Oxide as a Substrate for Biosensors: Synthesis and Characterization

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.324.87 ◽

2021 ◽

Vol 324 ◽

pp. 87-93

Author(s):

Mohamed Adel ◽

Abdel Hady A. Abdel-Wahab ◽

Ahmed Abdel-Mawgood ◽

Ahmed Osman Egiza

Keyword(s):

Raman Spectroscopy ◽

Graphene Oxide ◽

Acidic Solution ◽

Cost Effective ◽

Sem Analysis ◽

Visible Spectroscopy ◽

Sem Images ◽

Hummers Method ◽

Uv Visible ◽

Modified Hummers Method

Graphene oxide (GO) is an oxidized nanosheets of graphite with a 2D planar structure. GO could be readily complexed with bio-entities as it possesses many oxygen-containing functionalities on its surface. The preparation process is fast, easy, and cost-effective. It was prepared using modified Hummers’ method in acidic solution as a primary solvent and potassium permanganate as an oxidizing agent. Afterwards, it was successfully characterized by FTIR, UV-visible spectroscopy, as well as XRD and Raman spectroscopy, and finally, SEM analysis. It was observed that the formed GO is mainly composed of carbon and oxygen elements rich in oxygen functional groups. Furthermore, the existence of (001) plane in XRD interprets the complete oxidation of graphite with d-spacing 9 Å. Moreover, Raman spectroscopy displayed the sp3 carbon hybridization, besides, the ID/IG ratio is found to be 0.84, which confirms the disorder between graphene oxide layers. The SEM images also pointed out that graphene oxide sheets were regularly stacked together as flake-like structures. Accordingly, the richness of oxygen-containing functionalities was confirmed. Hence, it is appropriate to be used as a base transducer for biosensing applications.

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The Synthesis and Characterization of the Graphene Oxide Covalent Modified Phenolic Resin Nanocomposites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.327.115 ◽

2011 ◽

Vol 327 ◽

pp. 115-119 ◽

Cited By ~ 4

Author(s):

Duo Wang ◽

Jie Gao ◽

Wei Fang Xu ◽

Feng Bao ◽

Rui Ma ◽

...

Keyword(s):

Graphene Oxide ◽

Phenolic Resin ◽

Synthesis And Characterization ◽

Infrared Spectrometry ◽

Scanning Calorimetry ◽

X Ray ◽

Hummers Method ◽

Modified Hummers Method ◽

Thermal Stability Of

Graphene oxide (GO) was made by a modified Hummers method. Graphene oxide modified phenolic resin nanocomposites (GO/PF) were prepared by Steglich esterification, catalyzed by dicyclohexyl carbodiimide and 4-dimethylaminopyridine. The composites were characterized by Fourier transform infrared spectrometry, differential scanning calorimetry, X-ray powder diffraction, and scanning electron microscopy. The result revealed that the graphene oxide was absolutely exfoliated and covalent linked GO/PF composite was obtained. The thermal stability of PF is remarkably improved by modification with GO.

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Mechanical and thermal properties of graphene oxide/ultrahigh molecular weight polyethylene nanocomposites

RSC Advances ◽

10.1039/c5ra11826c ◽

2015 ◽

Vol 5 (77) ◽

pp. 63063-63072 ◽

Cited By ~ 49

Author(s):

Wenchao Pang ◽

Zifeng Ni ◽

Guomei Chen ◽

Guodong Huang ◽

Huadong Huang ◽

...

Keyword(s):

Molecular Weight ◽

Graphene Oxide ◽

Thermal Properties ◽

Ultrahigh Molecular Weight Polyethylene ◽

Mechanical And Thermal Properties ◽

Hummers Method ◽

Ultrahigh Molecular Weight ◽

Uhmwpe Composites ◽

Modified Hummers Method

Graphene oxide (GO) was prepared according to a modified Hummers method, and a range of GO/ultrahigh molecular weight polyethylene (UHMWPE) composites were fabricated then their mechanical and thermal properties were investigated.

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