Facile Graphene Oxide Preparation by Microwave-Assisted Acid Method

Viana, Marcelo Machado; Lima, Meiriane Cristina Faria Soares; Forsythe, Jerimiah C.; Gangoli, Varun Shenoy; Cho, Minjung; Cheng, Yinhong; Silva, Glaura G.; Wong, Michael S.; Caliman, Vinicius

doi:10.5935/0103-5053.20150061

Cited by 25 publications

(21 citation statements)

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“…Figure 3D,E displays the TEM image of the synthesized GNS and GNS/ β‐ MnO 2 ‐20% composite film. The synthesized GNS has layered and flexible sheets with dimension around 1 to 10 μm as shown in Figure 3D 36 . In Figure 3E, the synthesized GNS/ β‐ MnO 2 ‐20% composite film confirmed that the homogeneous MnO 2 particles were surrounded on the exterior of 2D graphene sheet (GNS); furthermore, the morphology of the composite film looks like a nanostructure.…”

Section: Resultsmentioning

confidence: 79%

“…The synthesized GNS has layered and flexible sheets with dimension around 1 to 10 μm as shown in Figure 3D. 36 In Figure 3E, the synthesized GNS/β-MnO 2 -20% composite film confirmed that the homogeneous MnO 2 particles were surrounded on the exterior of 2D graphene sheet (GNS); furthermore, the morphology of the composite film looks like a nanostructure. Figure 5 refers to the FT-IR spectrum of pure MnO 2 , synthesized GNS and GNS/β-MnO 2 -20% composite.…”

Section: Characterization Techniquesmentioning

confidence: 82%

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Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery

2020

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Graphene/β-MnO 2 composites were synthesized via ultrasonication method, followed by calcination at 400 C for 4 hours. The structural properties of synthesized graphene and graphene/β-MnO 2 composites were systematically studied using different instruments, such as XRD, FESEM, TEM, EDX, XPS and FT-IR spectroscopy. Furthermore, magnesium storage performance was scientifically studied using various electroanalytical characterizations like galvanostatic charge/discharge, electrochemical impedance spectra and cyclic voltammetry. The GNS/β-MnO 2-20% composite displays the discharge capacity of 110 mAh/g within 60 cycles at a current density of 25 mA/g, which is an excellent rate capability, and magnesium storage performance around 100 cycles. There is a significant improvement in electrochemical properties of GNS/β-MnO 2-20% composite materials as cathode for magnesium storage system due to the synergetic interaction between a pure β-MnO 2 particle and graphene sheet.

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Section: Resultsmentioning

confidence: 79%

Section: Characterization Techniquesmentioning

confidence: 82%

Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery

2020

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“…The presence of the D mode indicates the point defects and edge effects in the graphene layer. 38 The G mode resulted from inplane sp 2 carbon bonds in the ordered graphene layer and testifies to the degree of the carbon atoms' lattice order. 39 The broad band at 1460 cm −1 relates to the presence of nonbenzene five-member carbon rings.…”

Section: Resultsmentioning

confidence: 99%

“…In all GO Raman spectra, two major bands that correspond to the D (~1350 cm −1 ) and G bands (~1597 cm −1 ) and also a 2D triplet (~2687 cm −1 ), D + G (~2933 cm −1 ), and 2G (3196 cm −1 ) were detected. The presence of the D mode indicates the point defects and edge effects in the graphene layer 38 . The G mode resulted from in‐plane sp 2 carbon bonds in the ordered graphene layer and testifies to the degree of the carbon atoms' lattice order 39 .…”

Section: Resultsmentioning

confidence: 99%

Comparison of GO and polymer microcapacitors prepared by ion beam writing

Malínský

Romanenko

Havránek

et al. 2020

Surface & Interface Analysis

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Carbon beam writing was employed as a method for maskless production of microscale capacitors in both insulating graphene oxide (GO) and poly(methyl methacrylate) (PMMA) matrix. The GO and PMMA foils were irradiated using a 5-MeV C 3+ beam with micrometer scale resolution. As follows, the shape of the created microstructures and compositional changes was studied using the scanning electron microscopy/energy-dispersive X-ray spectroscopy method (SEM/EDS). The structural and compositional progression was characterized by Raman spectroscopy, Rutherford backscattering spectroscopy (RBS), and elastic recoil detection analysis (ERDA) spectroscopy. The improvement of the prepared structures' electrical properties was also studied, and it can be concluded that carbon irradiation leads to the removal of oxygen and hydrogen and to growth of the carbon domains, which is connected with the conductivity increase of the irradiated parts and capacitance of the final products in the order of pF.

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“…For instance, with the spin coating technique, the GO flakes lose some amount of adsorbed water, leading to decreased interlayer spacing. After drying in air, some cracks are initiated in the deposited GO thin film/layer due to the water evaporation process [ 50 ]. As a result, the interlayer spacing decreases further because of the additional loss of water.…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide-Based Membranes for Water Purification Applications: Effect of Plasma Treatment on the Adhesion and Stability of the Synthesized Membranes

et al. 2020

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The adhesion enhancement of graphene oxide (GO) and reduced graphene oxide (rGO) layer in the underlying polyethersulfone (PES) microfiltration membrane is a crucial step towards developing a high-performance membrane for water purification applications. In the present study, we modified the surface of a PES microfiltration membrane with plasma treatment (PT) carried out at different times (2, 10, and 20 min). We studied the effect of PT on the adhesion, stability, and performance of the synthesized GO/rGO-PES membranes. The membranes’ surface morphology and chemistry were characterized using atomic force microscopy, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The membrane performance was evaluated by conducting a diffusion test for potassium chloride (KCl) ions through the synthesized membranes. The results revealed that the 2 min PT enhanced the adhesion and stability of the deposited GO/rGO layer when compared to the other plasma-treated membranes. This was associated with an increase in the KCl ion rejection from ~27% to 57%. Surface morphology analysis at a high magnification was performed for the synthesized membranes before and after the diffusion test. Although the membrane’s rejection was improved, the analysis revealed that the GO layers suffered from micro/nano cracks, which negatively affected the membrane’s overall performance. The use of the rGO layer, however, helped in minimizing the GO cracks and enhanced the KCl ion rejection to approximately 94%. Upon increasing the number of rGO deposition cycles from three to five, the performance of the developed rGO-PES membrane was further improved, as confirmed by the increase in its ion rejection to ~99%.

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Facile Graphene Oxide Preparation by Microwave-Assisted Acid Method

Cited by 25 publications

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Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery

Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery

Comparison of GO and polymer microcapacitors prepared by ion beam writing

Graphene Oxide-Based Membranes for Water Purification Applications: Effect of Plasma Treatment on the Adhesion and Stability of the Synthesized Membranes

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Facile Graphene Oxide Preparation by Microwave-Assisted Acid Method

Cited by 25 publications

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Graphene/ β‐ MnO 2 composites—synthesis and its electroanalytical properties study in the Mg storage battery

Graphene/ β‐ MnO 2 composites—synthesis and its electroanalytical properties study in the Mg storage battery

Comparison of GO and polymer microcapacitors prepared by ion beam writing

Graphene Oxide-Based Membranes for Water Purification Applications: Effect of Plasma Treatment on the Adhesion and Stability of the Synthesized Membranes

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Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery

Graphene/ β‐ MnO ₂ composites—synthesis and its electroanalytical properties study in the Mg storage battery