Production of graphene layer by liquid-phase exfoliation with low sonication power and sonication time from synthesized expanded graphite

Güler, Ömer; Güler, Seval Hale; Selen, Veyis; Albayrak, Muhammet Gökhan; Evi̇n, Ertan

doi:10.1080/1536383x.2015.1114472

Cited by 83 publications

(40 citation statements)

References 27 publications

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“…More detailed information about the production process can be found in our previous study. 40 Figure 2 shows the TEM image and Raman spectra of GNSs produced by using the liquid-phase exfoliation method. It was found that the width of the layer is greater than 200 nm.…”

Section: Resultsmentioning

confidence: 99%

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

Güler

Say

Dikici

2020

Journal of Composite Materials

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In this study, the effect of graphene nano-sheets (GNSs) on mechanical and corrosion properties of AZ61 and AZ91 based composites was investigated, detail. GNSs have been successfully produced by the liquid phase exfoliation (LPE) method and then, added AZ61 and AZ91 matrix with 01, 0.2, and 0.5 wt% GNSs for the production of the composites. The composite compacts were produced by powder metallurgy technique and sintered for 2 h at 500 °C under Ar atmosphere. The composite characterizations were carried out by scanning and transmission electron microscopes (SEM, TEM), electron dispersive spectroscope (EDS), Raman spectroscopy, and X-ray diffraction. The mechanical properties and corrosion behaviors of the composites have been compared with compression tests and potentiodynamic scanning (PDS) techniques, respectively. The results showed that the compressive strength of the composites increased with increasing GNS amount in both the AZ61 and AZ91 matrix alloys. The most susceptible composites to corrosion for both AZ61 and AZ91 matrix were observed in the 0.5 wt% GNS containing structures. However, there is a certain ratio of GNS in the Mg matrix to achieve good corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

Güler

Say

Dikici

2020

Journal of Composite Materials

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“…7c presents a wrinkled and unordered structure of G-PA, which was synthesized by excessive cavitation in PA. Due to the high acidic character of PA, crumbled structure and deficiencies, low quality properties were observed on the surface morphology of the sample. Moreover, the dark coloured parts on the image of G-PA display the contamination arising from the residual solvent [46].…”

Section: Resultsmentioning

confidence: 99%

Graphene Synthesis by Ultrasound Energy Assisted Exfoliation of Graphite in Various Solvents

Gürünlü¹,

Taşdelen-Yücedağ²

2020

Preprint

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Liquid Phase Exfoliation (LPE) method has been gaining increasing interest by academic and industrial researchers due to its simplicity, low-cost, and scalability. High intensity ultrasound energy was exploited to transform graphite to graphene in the solvents of dimethyl sulfoxide (DMSO), N,N-dimethyl formamide (DMF), and perchloric acid (PA) without any surfactants or ionic liquids. The crystal structure, number of layers, particle size, and morphology of the synthesized graphene samples were characterized by X-ray Diffraction (XRD), Atomic Force Microscopy (AFM), Ultraviolet visible (UV–vis) spectroscopy, Dynamic Light Scattering (DLS), and Transmission Electron Microscopy (TEM). XRD and AFM analyses indicated that G-DMSO and G-DMF have few layers and G-PA has multilayers. The layer numbers of G-DMSO, G-DMF, and G-PA were determined as 9, 10, and 21, respectively. By DLS analysis, the particle sizes of graphene samples were estimated in a few micrometers. TEM analyses showed that G-DMSO and G-DMF possess sheet-like fewer layers and also, G-PA has wrinkled and unordered multilayers.

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“…Graphene is a two-dimensional allotrope of carbon formed by arraying carbon atoms in the form of a honey-comb lattice. In other words, a single layer of hexagonal graphite (h-G) which has a stratified structure is called graphene [1][2][3]. After Geim and Novoselov discovered and produced this material in 2004, interest in this material has fabulously increased [4,5].…”

Section: Introductionmentioning

confidence: 99%

The production of graphene–boron nitride nanosheet heterostructures via liquid phase exfoliation assisted by a milling process

Güler

Taşkın

2019

Bull Mater Sci

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Graphene-boron nitride (BN) nanosheet heterostructures have become one of the highly interesting matters in recent times owing to their advantages. In this study, the liquid phase exfoliation method was preferred for production of graphene-BN nanosheet heterostructures. However, a pre-milling process was applied to starting materials, instead of the classical liquid phase exfoliation method previously used in the literature. Hexagonal graphite (h-G) and h-BN mixtures were milled for 50 h and the milled powders were subjected to the liquid phase exfoliation process. As a result of the examinations, it was observed that graphene-BN nanosheet heterostructures were successfully synthesized. The widths of the synthesized nanosheets were 300-500 nm and nanosheets were multi-layers. It was seen that a large part of the powder mixture were occurred at high amorphization during the ball milling process. According to X-ray diffraction (XRD) peaks, the amorphization ratio was almost 90%. But, almost all of amorphous structures were removed during acid mixing and the thermal process. But, amorphous structures still existed in samples. In addition, the ball milling process damaged the sheets and defects formed. Despite all these disadvantages, the milling process carried out in this study provided formation of thinner and larger sheets compared with previous similar studies.

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Production of graphene layer by liquid-phase exfoliation with low sonication power and sonication time from synthesized expanded graphite

Cited by 83 publications

References 27 publications

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

Graphene Synthesis by Ultrasound Energy Assisted Exfoliation of Graphite in Various Solvents

The production of graphene–boron nitride nanosheet heterostructures via liquid phase exfoliation assisted by a milling process

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