High-Yield Organic Dispersions of Unfunctionalized Graphene

Hamilton, C. E.; Lomeda, Jay R.; Sun, Zhengzong; Tour, James M.; Barron, Andrew R.

doi:10.1021/nl9016623

Cited by 485 publications

(329 citation statements)

References 23 publications

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“…2a) showed that they contain graphene flakes with lateral size in range of ∼100-500 nm. The size of flakes correlates well with the values reported elsewhere using a sonication-assisted liquid exfoliation [14,20,23,44]. The thickness of the flakes was assessed with high resolution TEM (HRTEM) of flakes edges.…”

Section: Exfoliation Of Graphite To Graphenesupporting

confidence: 76%

“…Irreversible exfoliation of graphite occurs when the surface energy of the solvent is close to the surface energy of graphite which overcomes Van der Waals forces between graphene sheets [14,20]. Among the best tested solvents are 1-methyl-2-pyrrolidinone (NMP) [20][21][22] and halogenated aromatic solvents [23,24]. Even though NMP is widely used in the preparation of electrodes for Li-ion batteries which makes it a natural choice, its toxicity and environmental hazard prompted research toward its replacement with environmentally friendly solvents [25,26].…”

Section: Introductionmentioning

confidence: 99%

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Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Naboka

Yim

Abu-Lebdeh

2016

Materials Science and Engineering: B

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1016/j.mseb.2016.04.003Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation Naboka, Olga; Yim, Chae-Ho; Abu-Lebdeh, Yaser http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=53b49153-7e23-4e60-9847-41177eef882f http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=53b49153-7e23-4e60-9847-41177eef882f In the present work, we report a sonication-assisted exfoliation method of graphene preparation enhanced by the use of microwave heating and "green" exfoliant -sodium carboxymethyl cellulose (NaCMC). Introducing microwave heating during sonication of graphite dispersions in aqueous solutions of NaCMC results in the formation of graphene dispersions with concentration as high as 4.29 mg/ml. It is found that drying the dispersions results in the formation of graphene/NaCMC composites with graphene content up to 38.65 wt%. A study of the composite with High Resolution Transmission Electron Microscopy and Raman Spectroscopy reveals the formation of few-layer graphene approximately below five layers. The as-prepared graphene/NaCMC composite shows higher capacities than commercial graphite in Li-ion half cells reaching 397 mAh/g (graphene) . Also, when the composite is used with a nanosilicon (33 wt%) in a Li-ion half cell high initial reversible capacities of 1611 mAh/g (Si) with good cyclability and rate capability have been reached.

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Section: Exfoliation Of Graphite To Graphenesupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Naboka

Yim

Abu-Lebdeh

2016

Materials Science and Engineering: B

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“…Hence graphene holds potential for transparent conductive films (TCFs) application [50]. Graphene, the fascinating component of TCFs, can be fabricated by several methods: (1) GO-reduced graphene [51][52][53][54][55][56][57]; (2) graphene prepared by sonication of graphite in organic solvents, such as N-methyl-2-pyrrolidone and orthodichlorobenzene [58,59]; and (3) graphene grown on metal substrate by CVD [60][61][62][63]. The large scale productivity and low cost of GO-reduced graphene make it a superior candidate for the fabrication of TCFs.…”

Section: Transparent Conductive Filmsmentioning

confidence: 99%

The Prospective Two-Dimensional Graphene Nanosheets: Preparation, Functionalization and Applications

et al. 2012

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Abstract:Graphene, as an intermediate phase between fullerene and carbon nanotube, has aroused much interests among the scientific community due to its outstanding electronic, mechanical, and thermal properties. With excellent electrical conductivity of 6000 S/cm, which is independent on chirality, graphene is a promising material for high-performance nanoelectronics, transparent conductor, as well as polymer composites. On account of its Young's Modulus of 1 TPa and ultimate strength of 130 GPa, isolated graphene sheet is considered to be among the strongest materials ever measured. Comparable with the single-walled carbon nanotube bundle, graphene has a thermal conductivity of 5000 W/(m·K), which suggests a potential application of graphene in polymer matrix for improving thermal properties of the graphene/polymer composite. Furthermore, graphene exhibits a very high surface area, up to a value of 2630 m 2 /g. All of these outstanding properties suggest a wide application for this nanometer-thick, two-dimensional carbon material. This review article presents an overview of the significant advancement in graphene research: preparation, functionalization as well as the properties of graphene will be discussed. In addition, the feasibility and potential applications of graphene in areas, such as sensors, nanoelectronics and nanocomposites materials, will also be reviewed.

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“…While this method opened an avenue for many fundamental studies, it is likely impossible to scale for the production of larger quantities. The exfoliation of graphene in the liquid phase, by continuously sonicating graphite in a high surfacetension organic solvent [6,7], is another route to obtain mono-layered or few-layered sheets of graphene that are suspended in a dark mixture. However, the suspended graphene sheets tend to aggregate due to the lack of stabilizing groups such as surfactants or polymers to reduce interlayer attractions [8].…”

Section: Introductionmentioning

confidence: 99%

Soluble graphene through edge-selective functionalization

et al. 2010

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Thermally expanded graphite was functionalized with 4-bromophenyl addends using the in situ diazonium formation procedure, and after mild sonication treatment in N,N'-dimethylformamide, thin graphene layers were exfoliated from the bulk graphite. These chemically-assisted exfoliated graphene (CEG) sheets had higher solubility than pristine graphene without any stabilizer additive. More than 70% of these soluble flakes had less than 5 layers. Energy filtered transmission electron microscopy (EFTEM) elemental mapping provided evidence of the edge-selective diazonium functionalization with graphene. A majority of the Br signals came from the edges of the CEG indicating that the basal planes were not highly functionalized. The CEG was also characterized by X-ray photoelectron spectroscopy, atomic force microscopy, Raman spectroscopy, and transmission electron microscopy.

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High-Yield Organic Dispersions of Unfunctionalized Graphene

Cited by 485 publications

References 23 publications

Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

The Prospective Two-Dimensional Graphene Nanosheets: Preparation, Functionalization and Applications

Soluble graphene through edge-selective functionalization

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