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
Citations
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Effect of Al2O3 coverage on SiC particles for electrically insulated polymer composites with high thermal conductivity
TL;DR: Al2O3-covered SiC/epoxy composites were prepared using a simple sol-gel method as discussed by the authors, and the results of FE-SEM, TGA, and XPS indicated that the surfaces of the SiC particles had a large, dense, and homogenous distribution of Al2O 3.
Journal ArticleDOI
Evaluation of a thermal interface material fabricated using thermocompression bonding of carbon nanotube turf.
A. Hamdan,Jeong Hyun Cho,Ryan D. Johnson,Jun Jiao,David F. Bahr,Robert F. Richards,Cecilia D. Richards +6 more
TL;DR: In this work a thermal interface material fabricated by thermocompression bonding of vertically aligned carbon nanotube turf (VACNT) to metallized substrates was characterized and two configurations of VACNT were fabricated and tested.
Journal ArticleDOI
Flatness-dependent thermal conductivity of graphene-based composites
Ke Chu,Wensheng Li,Fuling Tang +2 more
TL;DR: In this article, a flatness ratio is proposed to analyze the thermal conductivity of GNP composites, which shows an excellent agreement with the experimental data and the theoretical analysis reveals that flatness ratios act as a dominant role in determining the influence of other factors.
Journal ArticleDOI
Enhanced thermal conductivity of graphene nanoplatelets epoxy composites
Lukasz Jarosinski,Andrzej Rybak,Karolina Gaska,Karolina Gaska,Grzegorz Kmita,Renata Porebska,Czesław Kapusta +6 more
TL;DR: In this article, the authors examined a possibility of increasing the thermal conductivity of the filled epoxy resin systems, applicable for electrical insulation, by the use of composites filled with graphene nanoplatelets.
Journal ArticleDOI
Influence of electrolessly silver-plated multi-walled carbon nanotubes on thermal conductivity of epoxy matrix nanocomposites
TL;DR: In this article, multi-walled carbon nanotubes (MWCNTs) were electrolessly Ag-plated in order to investigate the effect of plating time on the thermal conductivity of Agplated MWCNTs-reinforced epoxy matrix composites.
References
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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.