Exfoliation of graphite

Chung, D.D.L.

doi:10.1007/bf01132008

Cited by 410 publications

(220 citation statements)

References 31 publications

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“…Such nanoplatelets can improve stiffness/toughness balance, heat distortion temperature, flame proofing, barrier resistance, electrical conductivity, abrasion resistance. [32] Progress in graphite exfoliation [33][34][35] and formation of graphene-based nanocomposites [35][36][37][38] has been reviewed. The group of Drzal has developed processing technology to convert expanded graphite into graphite nanoplatelets (10 Â 1 000 nm) containing stacks of around ten graphenes.…”

Section: Melt Compounding Of Nanocomposites With Various Carbon Nanofmentioning

confidence: 99%

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

Steurer

Wissert

Thomann

et al. 2009

Macromol. Rapid Commun.

501

336

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Exfoliation of expanded GO represents an attractive route to functionalized graphenes as versatile 2D carbon nanomaterials and components of a wide variety of polymer nanocomposites. Thermally reduced graphite oxides (TrGO) with specific surface areas of 600 to 950 m2 · g−1 were obtained by oxidation of graphite followed by thermal expansion at 600 °C. Thermal post treatment at 700 °C and 1 000 °C increased carbon content (81 to 97 wt.‐%) and lowered resistivity (1 600 to 50 Ω · cm). During melt extrusion with PC, iPP, SAN and PA6, exfoliation afforded uniformly dispersed graphenes with aspect ratio > 200. In comparison to conventional 0D and 1D carbon nanoparticles, TrGO afforded nanocomposites with improved stiffness and lower percolation threshold. Recent progress and new strategies in development of functionalized graphenes and graphene‐based nanocomposites are highlighted.magnified image

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Section: Melt Compounding Of Nanocomposites With Various Carbon Nanofmentioning

confidence: 99%

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

Steurer

Wissert

Thomann

et al. 2009

Macromol. Rapid Commun.

501

336

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“…Graphite can be exfoliated by intercalation [18], oxidation (with subsequent reduction) [15] or sonication in organic solvents or water solutions of surfactants or polymers [14]. Graphene synthesis by chemical functionalization of graphite with intercalating compounds or its oxidation by modified Hummers method is a multistep process consequently resulting in a contaminated and defected product particularly when it comes to graphene oxide [19].…”

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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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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“…Exfoliated graphite is typically formed by exfoliation of intercalated graphite flakes. [22][23][24] Exfoliation involves expansion by up to hundreds of times along the c-axis of the graphite flake and is most commonly performed by rapid heating. Because of the cellular structure of exfoliated graphite, compaction of a collection of exfoliated graphite results in mechanical interlocking of the exfoliated graphite particles, thereby forming a sheet.…”

Section: Introductionmentioning

confidence: 99%

Solder–Graphite Network Composite Sheets as High-Performance Thermal Interface Materials

Sharma

Chung

2015

Journal of Elec Materi

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Low-cost solder-graphite composite sheets ( ‡55 vol.% solder), with solder and graphite forming interpenetrating networks to a degree, are excellent thermal interface materials (TIMs). Solders 63Sn-37Pb and 95.5Sn-4Ag-0.5Cu are separately used, with the latter performing better. In composite fabrication, a mixture of micrometer-size solder powder and ozone-treated exfoliated graphite is compressed to form a graphite network, followed by fluxless solder reflow and subsequent hot pressing to form the solder network. The network connectivity (enhanced by ozone treatment) is lower in the through-thickness direction. The electrical conductivity obeys the rule of mixtures (parallel model in-plane and series model through-thickness), with anisotropy 7. Thermal contact conductance £26 9 10 4 W/(m 2 K) (with 15-lm-roughness copper sandwiching surfaces), through-thickness thermal conductivity £52 W/ (m K), and in-plane thermal expansion coefficient 1 9 10 À5 /°C are obtained. The contact conductance exceeds or is comparable to that of all other TIMs, provided that solder reflow has occurred and the composite thickness is £100 lm. Upon decreasing the thickness below 100 lm, the sandwich thermal resistivity decreases abruptly, the composite through-thickness thermal conductivity increases abruptly to values comparable to the calculated values based on the rule of mixtures (parallel model), and the composite-copper interfacial thermal resistivity (rather than the composite resistivity) becomes dominant.

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Exfoliation of graphite

Cited by 410 publications

References 31 publications

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

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

Solder–Graphite Network Composite Sheets as High-Performance Thermal Interface Materials

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