Preparation and Characterization of Reduced Graphene Oxide Sheets via Water-Based Exfoliation and Reduction Methods

This research studied the synthesis of graphene oxide and graphene via a low-cost manufacturing method. The process started with the chemical oxidation of commercial graphite powder into graphite oxide by modified Hummer’s method, followed by the exfoliation of graphite oxide in distilled water using the ultrasound frequency from a laboratory ultrasonic bath. Finally, the oxygen functional groups on exfoliated graphite oxide or graphene oxide were eliminated by stirring in hot distilled water at 95°C, as a replacement for highly toxic and dangerously unstable hydrazine. The results assured that stirring in hot distilled water could give the product of graphene or reduced graphene oxide. The samples were characterized by FTIR, XRD, TGA, Raman spectroscopy, SEM, and TEM methods.

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Crumpled reduced graphene oxide by flame-induced reduction of graphite oxide for supercapacitive energy storage

Journal of Materials Chemistry A ◽

10.1039/c3ta15082h ◽

2014 ◽

Vol 2 (16) ◽

pp. 5730-5737 ◽

Cited By ~ 37

Author(s):

Yan-Zhen Liu ◽

Cheng-Meng Chen ◽

Yong-Feng Li ◽

Xiao-Ming Li ◽

Qing-Qiang Kong ◽

...

Keyword(s):

Graphene Oxide ◽

Energy Storage ◽

Reduced Graphene Oxide ◽

Graphite Oxide ◽

Reduction Method ◽

Low Cost ◽

Polar Solvents ◽

Supercapacitive Performance ◽

Efficient Energy ◽

Reduced Graphene

Reduced graphene oxide powder was prepared by a flame-induced reduction method with the assist of flammable polar solvents. The new method is simple, efficient, energy saving, low-cost and scalable. As-prepared reduced graphene oxide displays excellent supercapacitive performance.

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Ultrasonic Assisted Synthesis of Reduced Graphene Oxide in Glucose Solution

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.708.25 ◽

2016 ◽

Vol 708 ◽

pp. 25-29

Author(s):

Ainnur Izzati Kamisan ◽

Lili Widarti Zainuddin ◽

Ainnur Sherene Kamisan ◽

T.I.T. Kudin ◽

Oskar Hasdinor Hassan ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Graphite Oxide ◽

Glucose Solution ◽

Graphite Powder ◽

Green Approach ◽

Reduced Graphene ◽

Mild Reduction ◽

Ultrasonic Assisted ◽

Device Applications

A new carbon material viz. graphene has been attracted an increasing research interest owing to its unique electrical and mechanical properties that is useful for the various device applications. The synthesis of graphene from graphene oxide usually involves harmful chemical reducing agents that are toxic and undesirable to human and the environment. By avoiding the use of toxic and environmentally harmful reductants, we report a green approach to effectively reduce graphene oxide to graphene in glucose solution at room temperature. Graphite oxide was synthesized from graphite powder using modified Hummers’ method. Graphite oxide then further exfoliated to graphene oxide by using ultrasonic irradiation. The mild reduction of graphene oxide is carried out by mixing graphene oxide solution with glucose. The reduction time is varied with 15, 30, 45 and 60 minutes. TEM images provide clear evidence for the formation of few layer graphene. Characterization of theresulting glucose reduced graphene oxide by FTIR indicates the partial removal of oxygen-containing functional groups from the surface of graphene oxide and formation of graphene with defects.

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Green Synthesis of Reduced Graphene Oxide Using Ascorbic Acid

Iraqi Journal of Science ◽

10.24996/ijs.2020.61.6.9 ◽

2020 ◽

pp. 1313-1319

Author(s):

Hayder A Hessain ◽

J. J. Hassan

Keyword(s):

Ascorbic Acid ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Low Cost ◽

Graphite Powder ◽

X Ray ◽

Chemical Exfoliation ◽

Reduced Graphene ◽

Synthesized Materials ◽

Modified Hummers Method

A green and low-cost method was used to prepare graphene oxide (GO) and reduced graphene oxide (rGO) by chemical exfoliation of graphite powder by modified Hummers method, followed by reduction using ascorbic acid. X-ray diffractometry (XRD) and field emission scanning electron microscopy (FE-SEM) were used to analyze the structure and morphology of the synthesized materials. Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy were used to identify the formation of the GO and rGO

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Self-supported 3D reduced graphene oxide for solid-phase extraction: An efficient and low-cost sorbent for environmental contaminants in aqueous solution

Talanta ◽

10.1016/j.talanta.2021.122750 ◽

2021 ◽

pp. 122750

Author(s):

Raimara de Souza Gomes ◽

Anderson Thesing ◽

Jacqueline Ferreira Leite Santos ◽

Andreia Neves Fernandes

Keyword(s):

Aqueous Solution ◽

Graphene Oxide ◽

Solid Phase Extraction ◽

Reduced Graphene Oxide ◽

Solid Phase ◽

Low Cost ◽

Environmental Contaminants ◽

Phase Extraction ◽

Reduced Graphene

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Synthesis and Characterization of Reduced Graphene Oxide

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.678.56 ◽

2013 ◽

Vol 678 ◽

pp. 56-60 ◽

Cited By ~ 16

Author(s):

Cherukutty Ramakrishnan Minitha ◽

Ramasamy Thangavelu Rajendrakumar

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Graphite Oxide ◽

High Performance ◽

Structural Changes ◽

Epoxy Group ◽

Xrd Analysis ◽

Si Substrates ◽

Reduced Graphene ◽

Reduced Graphite Oxide

Reduced graphene oxide is an excellent candidate for various electronic devices such as high performance gas sensors. In this work Graphene oxide was prepared by oxidizing graphite to form graphite oxide. From XRD analysis the peak around 11.5o confirmed that the oxygen was intercalated into graphite. By using hydrazine hydrate, the epoxy group in graphite oxide was reduced then the solution of reduced graphite oxide (rGO) is exfoliated. Raman spectrum of rGO contains both G band (1580 cm-1), D band (1350 cm-1). The remarkable structural changes reveals that reduction of graphene oxide from the values of ID/IG ratio that increase from 0.727 (GO) to 1.414 (rGO). The exfoliated reduced graphite oxide solution is spin coated on to the SiO2/Si substrates.

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A Facile and Green Synthesis of a MoO2-Reduced Graphene Oxide Aerogel for Energy Storage Devices

Materials ◽

10.3390/ma13030594 ◽

2020 ◽

Vol 13 (3) ◽

pp. 594 ◽

Cited By ~ 3

Author(s):

Mara Serrapede ◽

Marco Fontana ◽

Arnaud Gigot ◽

Marco Armandi ◽

Glenda Biasotto ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Chemical Reduction ◽

Low Cost ◽

Xps Analysis ◽

3D Scaffold ◽

Energy Storage Devices ◽

Reduced Graphene

A simple, low cost, and “green” method of hydrothermal synthesis, based on the addition of l-ascorbic acid (l-AA) as a reducing agent, is presented in order to obtain reduced graphene oxide (rGO) and hybrid rGO-MoO2 aerogels for the fabrication of supercapacitors. The resulting high degree of chemical reduction of graphene oxide (GO), confirmed by X-Ray Photoelectron Spectroscopy (XPS) analysis, is shown to produce a better electrical double layer (EDL) capacitance, as shown by cyclic voltammetric (CV) measurements. Moreover, a good reduction yield of the carbonaceous 3D-scaffold seems to be achievable even when the precursor of molybdenum oxide is added to the pristine slurry in order to get the hybrid rGO-MoO2 compound. The pseudocapacitance contribution from the resulting embedded MoO2 microstructures, was then studied by means of CV and electrochemical impedance spectroscopy (EIS). The oxidation state of the molybdenum in the MoO2 particles embedded in the rGO aerogel was deeply studied by means of XPS analysis and valuable information on the electrochemical behavior, according to the involved redox reactions, was obtained. Finally, the increased stability of the aerogels prepared with l-AA, after charge-discharge cycling, was demonstrated and confirmed by means of Field Emission Scanning Electron Microscopy (FESEM) characterization.

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