Organic salt-assisted liquid-phase exfoliation of graphite to produce high-quality graphene

Du, Wencheng; Lü, Jie; Sun, Peipei; Zhu, Yinyan; Jiang, Xiaoqing

doi:10.1016/j.cplett.2013.03.060

Cited by 116 publications

(53 citation statements)

References 20 publications

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“…It is considered that the graphene flakes can be obtained by HAN-assisted LPE of graphite with sonication. Previously, the graphene flakes can be hardly prepared by LPE of graphite in pure DMSO, even if added NaOH (Liu and Wang 2011;Shih et al 2010;Du et al 2013). For comparison, the same amounts of pristine graphite (0.3 g) were severally added into 10 mL of DMSO with addition of KOH and HANs/DMSO dispersion (1 mg/mL) followed with sonication of 7 h. Through centrifugal separation, the color of the exfoliated graphene dispersions from HANs/DMSO dispersion is opacity and jet black, deeper than the graphene dispersion exfoliated in DMSO with addition of KOH (Inset of Fig.…”

Section: Direct Lpe Of Graphite With Assist Of Hansmentioning

confidence: 99%

Heterocyclic aramid nanoparticle-assisted graphene exfoliation for fabrication of pristine graphene-based composite paper

Liu

Fan

et al. 2015

J Nanopart Res

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Mechanically strong, electrically conductive, and flexible pristine graphene-based composite paper was prepared based on heterocyclic aramid nanoparticle-assisted liquid-phase exfoliation of graphite. The macroscopic heterocyclic aramid yarns were split and assembled into heterocyclic aramid nanoparticles with the size of *30 nm by deprotonation in dimethylsulfoxide in the presence of potassium hydroxide. The obtained heterocyclic aramid nanoparticles dimethylsulfoxide dispersion was used as good medium solvent for highly efficiency liquid-phase exfoliation of graphite. The results demonstrated that the concentration of exfoliated graphene can facile reaches *2.72 mg/mL after direct sonication of 7 h with assist of heterocyclic aramid nanoparticles. After exfoliation, the self-assembled pristine graphenebased composite paper was fabricated by vacuumassisted filtration. Due to the introduction of heterocyclic aramid nanoparticles, the self-assembled pristine graphene/heterocyclic aramid nanoparticles composite paper exhibited good mechanical property with tensile strength of *129.7 MPa, meantime, has a high electrical conductivity of *1.42 9 10 4 S/m.

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Section: Direct Lpe Of Graphite With Assist Of Hansmentioning

confidence: 99%

Heterocyclic aramid nanoparticle-assisted graphene exfoliation for fabrication of pristine graphene-based composite paper

Liu

Fan

et al. 2015

J Nanopart Res

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“…30 Du et al introduced some organic salt to assist exfoliation and enhanced the efficiency up to 123 times. 31 In order to direct the innovation in enhancing the liquid phase exfoliation effect, two significant issues must be addressed: on one hand, how many factors influence the exfoliation degree (input); on the other hand, which index can represent the exfoliation degree (output). Much attention was paid to these questions by researches worldwide.…”

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confidence: 99%

The effect of surfactants and their concentration on the liquid exfoliation of graphene

Wang

Shen

2016

RSC Adv.

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We investigated the effect of surfactants and their concentration (C sur ) on the final graphene concentration (C G ) via the liquid-phase exfoliation method. Six typical surfactants including ionic and non-ionic ones were explored and the optimized C sur for each surfactant was suggested. For ionic surfactants, C G increases with C sur before reaching its maximum and then maintains the high level. The different mechanisms of ionic and non-ionic surfactants in stabilizing graphene dispersions are explained by the theory for colloidal stability. The as-prepared graphene sheets are verified to be highly exfoliated through transmission electron microscopy and atomic force microscopy studies, while the defect-free structure was evidenced by Raman spectra and X-ray photoelectron spectroscopy.

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“…Conversion of graphene to graphene oxide is an irreversible process, and it is impossible to return an original structure and the electrical properties by reduction, the product of which is called a reduced graphene oxide [23]. For these reasons, the development of quantitative methods for the preparation of graphene is the subject of much research in the last few years [15,17,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Preparation and Subsequent Fixation of Oxygen‐Free Graphene Sheets at N,N‐Dimethyloctylamine‐Aqua Boundary

Trusova

Kotsareva

Кириченко

et al. 2018

Advances in Materials Science and Engineering

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In this study, the syntheses of oxygen-free graphene sheets and the method of its fixation at an oil-aqua interface were presented. e graphene sheets were prepared by exfoliation of synthetic graphite powder in an aqua-organic medium under ultrasound irradiation. N,N-Dimethyloctylamine-(DMOA-) aqua emulsion was used as the liquid medium, and pH was equal to 3. e obtained graphene nanosuspension was fractionated by sedimentation and decanted according to the weight. e graphene nanoparticle fractions, differing in configuration and number of layers, have been characterized using transmission electron microscopy (TEM), electron diffraction, HRTEM, Raman spectroscopy, and electron energy loss spectroscopy (EELS). It was found that using a DMOA-aqua mixture as the liquid medium in ultrasonic treatment of synthetic graphite leads to the formation of oxygen-free 1-2-layer graphene sheets attached to the DMOA-aqua interface. e proposed method differs from known ones by using a small amount of more environmentally friendly organic substances. It allows to obtain large quantities of oxygen-free graphene, and finally unconverted graphite can be directed for reuse. e proposed method allows to obtain both 2D graphene sheets with micron linear dimensions and 3D packages with a high content of defects. Both these species are in demand in areas related to the development of new materials with unique electrophysical properties.

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Organic salt-assisted liquid-phase exfoliation of graphite to produce high-quality graphene

Cited by 116 publications

References 20 publications

Heterocyclic aramid nanoparticle-assisted graphene exfoliation for fabrication of pristine graphene-based composite paper

Heterocyclic aramid nanoparticle-assisted graphene exfoliation for fabrication of pristine graphene-based composite paper

The effect of surfactants and their concentration on the liquid exfoliation of graphene

Sonochemical Preparation and Subsequent Fixation of Oxygen‐Free Graphene Sheets at N,N‐Dimethyloctylamine‐Aqua Boundary

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