Synthesis of Graphene Oxide from Alternative Sources

2016 ◽  
Vol 38 ◽  
pp. 96-100
Author(s):  
Miguel Sanchez ◽  
Mauro Cesar Terence ◽  
Juan Alfredo Guevara Carrió
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Large Scale ◽  
Two Dimensional ◽  
Hummers Method ◽  
Exothermic Process ◽  
Alternative Sources ◽  
Redox Method ◽  
Modified Hummers Method

Two-dimensional films of graphene oxide (GO) have been synthesized using various oxidation methods such as the conventional or modified Hummers method. The redox method for graphite has shown promise at producing GO films on a large scale. However, this method is a very exothermic process that liberates gases that are harmful to the environment and humans. This article addresses the characterization of graphene oxide from alternative sources of carbon and using the dry method. Comparative studies performed using Raman spectroscopy suggest that this method is both promising and more environmentally friendly.

Graphene Oxide as a Substrate for Biosensors: Synthesis and Characterization

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.

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

2011 ◽  
Vol 327 ◽  
pp. 115-119 ◽  
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.

Synthesis and Characterization of Silaned-Graphene Oxide-Mordenite Grafting

2016 ◽  
Vol 718 ◽  
pp. 81-86 ◽  
Author(s):  
Noppawan Pattanapisutkun ◽  
Chaiwat Prapainainar ◽  
Paisan Kongkachuichay ◽  
Paweena Prapainainar
Keyword(s):  
Graphene Oxide ◽  
Silane Coupling Agent ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Excellent Thermal Stability ◽  
X Ray ◽  
Hummers Method ◽  
Silane Coupling ◽  
Modified Hummers Method

The grafted materials of silaned-graphene oxide-mordenite (s-GO-MOR) were synthesized by grafting graphene oxide (GO) sheets to acid-treated mordenite and followed by functionalization with silane. GO sheets were prepared according to the modified Hummers method. 3-mercaptopropyltriethoxysilane (MPTES) was used as a silane coupling agent. The products were characterized by a Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy and thermogravimetric analysis. The results confirmed the success of s-GO-MOR and showed excellent thermal stability.

scholarly journals Preparation and Characterization of Graphene Oxide

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jianguo Song ◽  
Xinzhi Wang ◽  
Chang-Tang Chang
Keyword(s):  
Graphene Oxide ◽  
Large Scale ◽  
Layer Structure ◽  
Dimensional Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lamellar Layer ◽  
Ft Ir ◽  
Redox Method

Graphene oxide (GO) films with two-dimensional structure were successfully prepared via the modified Hummer method. It is proven that redox method is a promising way to synthesize GO films on a large scale. Comprehensive characterizations of the properties of GO films were conducted. TEM and DFM analyses showed that GO sheets prepared in this study had single and double lamellar layer structure and a thickness of 2~3 nm. X-ray diffraction (XRD) was selected to measure the crystal structure of GO sheet. Fourier-transform infrared spectra analyzer (FT-IR) was used to certify the presence of oxygen-containing functional groups in GO films. The tests of UV-VIS spectrometer and TGA analyzer indicated that GO sheet possessed excellent optical response and outstanding thermal stability. Elemental analyzer (EA) and X-ray photoelectron spectroscope (XPS) analyzed the components synthetic material. Simultaneously, chemical structure of GO sheet was described in this study. Discussion and references for further research on graphene are provided.

scholarly journals Raman Spectroscopy Investigation of Graphene Oxide Reduction by Laser Scribing

2021 ◽  
Vol 7 (2) ◽  
pp. 48
Author(s):  
Vittorio Scardaci ◽  
Giuseppe Compagnini
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Reduce Graphene Oxide ◽  
Oxide Reduction ◽  
Material Parameters ◽  
Laser Scribing ◽  
Wide Range ◽  
Scan Speed ◽  
Laser Reduction

Laser scribing has been proposed as a fast and easy tool to reduce graphene oxide (GO) for a wide range of applications. Here, we investigate laser reduction of GO under a range of processing and material parameters, such as laser scan speed, number of laser passes, and material coverage. We use Raman spectroscopy for the characterization of the obtained materials. We demonstrate that laser scan speed is the most influential parameter, as a slower scan speed yields poor GO reduction. The number of laser passes is influential where the material coverage is higher, producing a significant improvement of GO reduction on a second pass. Material coverage is the least influential parameter, as it affects GO reduction only under restricted conditions.

THE EFFECT OF THERMAL ANNEALING AND PULSE LASER ANNEALING IN THE REDUCTION OF GRAPHENE OXIDE

2021 ◽  
Vol 5 (1) ◽  
pp. 47-56
Author(s):  
Adeyemi Owolabi ◽  
Ali Haruna ◽  
Felix Ekwuribe ◽  
Raphael Ushiekpan Ugbe ◽  
Alexander Bulus Bature ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pulse Laser ◽  
Large Scale ◽  
Laser Annealing ◽  
Thermal Reduction ◽  
Reduction Technique ◽  
Laser Method ◽  
Glass Substrates ◽  
Promising Application ◽  
Alternative Sources

The discovery of Graphene and its unique properties has attracted great interest. Unfortunately, the synthesis of graphene in large scale is challenging, for this reason the derivative of graphene such as graphene oxide (GO) and reduce graphene oxide (rGO) have become alternative sources. The reduction of graphene oxide is an alternative route to obtain graphene-like behavior. This study is aim at examining the similarities and difference between thermal reduction technique and pulse laser method of reduction of (GO). The method utilizes a pulse laser beam for reduction of GO layers on glass substrates and thermal reduction technique. Using the pulse laser method, conductivity of reduced GO was found to be 2.325E-2(1/ohm) which is six times higher than conductivity values reported for GO layers reduced by thermal means at 400oC which was 3.740E-3(1/ohm). A higher transmittance was observed for the pulse laser annealed which holds promising application in a lot technological research. The scanning electron microscope (SEM) result reveals the evenly distribution of the GO around the substrate. The non-thermal nature of the pulse laser method combined with its simplicity and scalability, makes it very attractive for the future manufacturing of large-volume graphene-based optoelectronics

Raman spectroscopy characterization of two-dimensional materials

2018 ◽  
Vol 27 (3) ◽  
pp. 037802 ◽  
Author(s):  
Fang Liang ◽  
Hejun Xu ◽  
Xing Wu ◽  
Chaolun Wang ◽  
Chen Luo ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Two Dimensional ◽  
Two Dimensional Materials

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

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63063-63072 ◽  
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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