Effect of Sodium Nitrate on the Formation of Graphene Oxide via Modified Hummers Method for Sensors Application

2021 ◽  
Author(s):  
Mohd Rafal Sahudin ◽  
Siti Rabizah Makhsin ◽  
Muhammad Azmi Ayub ◽  
Nor Hayati Saad ◽  
Rozina Abdul Rani ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sodium Nitrate ◽  
Hummers Method ◽  
Modified Hummers Method

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.

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.

scholarly journals THE PERFORMANCE OF GREEN SYNTHESIS OF GRAPHENE OXIDE PREPARED BY MODIFIED HUMMERS METHOD WITH OXIDATION TIME VARIATION

2021 ◽  
Vol 14 (03) ◽  
pp. 2017-2023
Author(s):  
U. Chasanah ◽  
W. Trisunaryanti ◽  
Triyono ◽  
H.S. Oktaviano ◽  
D.A Fatmawati
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Time Variation ◽  
Oxidation Time ◽  
Hummers Method ◽  
Modified Hummers Method

Safer modified Hummers’ method for the synthesis of graphene oxide with high quality and high yield

2020 ◽  
Vol 6 (12) ◽  
pp. 125631 ◽  
Author(s):  
Guillermo Santamaría-Juárez ◽  
Estela Gómez-Barojas ◽  
Enrique Quiroga-González ◽  
Enrique Sánchez-Mora ◽  
Mildred Quintana-Ruiz ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Yield ◽  
High Quality ◽  
Hummers Method ◽  
Modified Hummers Method

Synthesis of Graphene Oxide Nanosheets via Modified Hummers’ Method and Its Physicochemical Properties

2015 ◽  
Vol 74 (1) ◽  
Author(s):  
Mohamad Fahrul Radzi Hanifah ◽  
Juhana Jaafar ◽  
Madzlan Aziz ◽  
Ahmad Fauzi Ismail ◽  
Mukhlis A. Rahman ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Physicochemical Properties ◽  
Functional Groups ◽  
Interlayer Spacing ◽  
Graphene Oxide Nanosheets ◽  
Hummers Method ◽  
Exfoliated Graphene ◽  
Transmission Electron ◽  
Direct Methanol ◽  
Modified Hummers Method

The efficient synthesis of exfoliated graphene oxide nanosheets (GO) via modified Hummers’ method was successfully carried out. The physicochemical properties of GO were determined by Fourier transform infrared spectroscopy (FTIR), UV-visible spectrophotometry (UV-vis), x-ray diffraction analysis (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). The graphite was fully oxidized by strong oxidizing agent caused the oxygen-containing functional groups such as C-O-C, C=O, and COOH were introduced into the graphite layers as analyzed by Raman and FTIR.  XRD pattern of GO showed 2θ of 12.0o with interlayer spacing ~ 7.37A which describe non uniform crystal structure with the addition of oxygen containing functional groups. UV-vis spectrum of GO exhibit maximum absorption peak at ~ 234 nm corresponding to the aromatic C=C bond with π-π* transition. The morphology of GO was observed to have flake-like shape and less transparent layers by TEM. The properties of synthesized GO suggest high potential in producing the high quality of graphene which is can be applied as the electrocatalyst support for direct methanol fuel cell application.              

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