Journal ArticleDOI
Graphite Nanoplatelet−Epoxy Composite Thermal Interface Materials
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TLDR
In this article, the performance of a few graphene layer n ∼ 4, with a thickness of ∼ 2 nm, was investigated for epoxy composites and it was shown that the G4 GNPs provide a thermal conductivity enhancement of more than 3000% (loading of ∼25 vol %).Abstract:
Natural graphite was intercalated, thermally exfoliated, and dispersed in acetone to prepare graphite nanoplatelets (GNPs, Gn) of controlled aspect ratio. Thermal conductivity measurements indicate that few graphene layer Gn, where n ∼ 4, with a thickness of ∼2 nm function as a very efficient filler for epoxy composites. When embedded in an epoxy matrix, the G4 GNPs provide a thermal conductivity enhancement of more than 3000% (loading of ∼25 vol %), and a thermal conductivity κ = 6.44 W/mK, which surpasses the performance of conventional fillers that require a loading of ∼70 vol % to achieve these values. We attribute the outstanding thermal properties of this material to a favorable combination of the high aspect ratio, two-dimensional geometry, stiffness, and low thermal interface resistance of the GNPs.read more
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Double-Wall Nanotubes and Graphene Nanoplatelets for Hybrid Conductive Adhesives with Enhanced Thermal and Electrical Conductivity
E. Messina,Nancy Leone,Antonino Foti,Gaetano Di Marco,Cristina Riccucci,Gabriella Di Carlo,Francesco Di Maggio,Antonio Cassata,Leonardo Gargano,Cristiano D’Andrea,Barbara Fazio,Onofrio M. Maragò,Benedetto Robba,Cirino Vasi,Gabriel Maria Ingo,Pietro Giuseppe Gucciardi +15 more
TL;DR: Graphene yields better performances with respect to nanotubes in terms of conductivity and filler quantity needed to improve the resin, and is applied to bond GaN-based high-electron-mobility transistors in power-amplifier circuits.
Journal ArticleDOI
Evolving Strategies for Producing Multiscale Graphene-Enhanced Fiber-Reinforced Polymer Composites for Smart Structural Applications
TL;DR: Development of clear standards for the assessment of graphene material properties, improvement of existing materials and scalable manufacturing technologies, and specific regulations concerning human health and environmental safety are key factors to accelerate the successful commercialized gFRPs.
Journal ArticleDOI
Modeling and analysis of synergistic effect in thermal conductivity enhancement of polymer composites with hybrid filler
TL;DR: In this article, a two-step analytical model was developed for calculating the effective thermal conductivity (keff) of epoxy composites containing hybrid single-walled carbon nanotubes (SWCNTs) and graphite nanoplatelets (GNPs) filler.
Journal ArticleDOI
Surface chemistry of graphene and graphene oxide: A versatile route for their dispersion and tribological applications.
TL;DR: A thorough review is presented on preparation, structural models, chemical functionalization, and dispersibility of graphene, graphene oxide, chemically-functionalized graphene, and graphene-derived nanocomposites to accentuate the lubrication mechanisms by highlighting the role of graphene-based materials for enhancement of tribological properties.
Journal ArticleDOI
Thermal Management in Polymer Composites: A Review of Physical and Structural Parameters
Hyun Su Kim,Hyun Su Kim,Ji-un Jang,Hyeseong Lee,Seong Yun Kim,Seong Hun Kim,Jaewoo Kim,Jung Yong Chae,Beomjoo Yang +8 more
TL;DR: In this paper, the thermal conductivity of carbon-polymer nanocomposites has been reported to be low near the lower boundary of the rule of mixtures, and various dispersing processes have been developed to achieve uniform dispersion of the nanocarbon fillers, including an in situ polymerization process based on ring-opening polymerizable oligoesters.
References
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Journal ArticleDOI
Two-dimensional gas of massless Dirac fermions in graphene
Kostya S. Novoselov,A. K. Geim,Sergey V. Morozov,Da Jiang,Mikhail I. Katsnelson,Irina V. Grigorieva,S. V. Dubonos,A. A. Firsov +7 more
TL;DR: This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
Journal ArticleDOI
Graphene-based composite materials
Sasha Stankovich,Dmitriy A. Dikin,Geoffrey Dommett,K. Kohlhaas,Eric Zimney,Eric A. Stach,Richard D. Piner,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
Journal ArticleDOI
Experimental observation of the quantum Hall effect and Berry's phase in graphene
TL;DR: In this paper, an experimental investigation of magneto-transport in a high-mobility single layer of Graphene is presented, where an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene is observed.
Journal Article
Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
TL;DR: An experimental investigation of magneto-transport in a high-mobility single layer of graphene observes an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene.
Journal ArticleDOI
Electronic Confinement and Coherence in Patterned Epitaxial Graphene
Claire Berger,Claire Berger,Zhimin Song,Xuebin Li,Xiaosong Wu,Nate Brown,Cécile Naud,Didier Mayou,Tianbo Li,J. Hass,Alexei Marchenkov,Edward H. Conrad,Phillip N. First,Walt A. de Heer,Walt A. de Heer +14 more
TL;DR: In this paper, a single epitaxial graphene layer at the silicon carbide interface is shown to reveal the Dirac nature of the charge carriers, and all-graphene electronically coherent devices and device architectures are envisaged.