Enhanced thermal conductivity of epoxy/three-dimensional carbon hybrid filler composites for effective heat dissipation

Abstract

Graphitic carbon nanomaterials (CNMs) are recognized as next-generation heat dissipating materials (HDMs) for efficient thermal conduction within a polymer composite. Commercially used carbon-based HDMs, including carbon blacks, carbon nanotubes (CNTs), and graphites, are limited by low thermal conductivity under 50% filler content. Two-dimensional graphenes show high thermal conductivity in their major (xy) planes; however, they still exhibit low thermal conductivity in the z direction, i.e., perpendicular to the major plane, because of the difficulty in obtaining a proper vertical alignment. Here, we introduce a straightforward strategy to improve the thermal conductivity of graphene-based HDMs in both the xy-and z-directions and report the results of our investigation of the thermal conductivity behavior of the epoxy composites. Our newly designed graphene-based HDMs were observed to adopt directly anchored and ohmic-contact morphologies between graphene nanoplatelets (GNP) and CNTs via bimetallic nanoparticle decoration on the GNP surface and subsequent carbon vapor deposition (CVD), and their epoxy composites showed an approximately two-fold enhancement of both in-and through-plane thermal conductivities compared to those of bare GNPs.

Reduce the Sensitivity of CL-20 by Improving Thermal Conductivity Through Carbon Nanomaterials

“…Graphene has a large π -conjugated two-dimensional structure with a large phonon mean free path and high electron mobility, providing a large contact area and providing a two-dimensional path for phonon transport [ 14 ]. However, the van der Waals’ force between the graphene layers lead to a large interlayer thermal resistance, so that the thermal conductivity perpendicular to the plane direction is significantly lower than the in-plane thermal conductivity, and the distribution of the rGO is intricate and sometimes difficult to form the conduction path on same plane [ 15 ]. As a one-dimensional material with tubular structure, the high thermal conductivity and high aspect ratio of CNT is beneficial to improve the heat transfer of polymer composites, and the most important is that CNT could provide more paths for the phonon transport and bridge the rGO and explosives [ 16 ].…”

Improved thermal conductivity of epoxy composites prepared with a mixed filler of multiwalled carbon nanotubes and aluminum nitride particles

“…5 In addition, these fillers are beneficial for the development of relevant application techniques. To date, many efforts have been made to discover the relationship between improved thermal conductivity of polymer composites and properties of various fillers, such as boron nitride, [6][7][8][9] alumina, 10,11 aluminum nitride (AlN), 12,13 aluminum hydroxide/magnesium hydrate, 14 graphene, 15 graphene nanoplatelets, 16,17 carbon nanotubes (CNTs), 4,18,19 and zinc oxide. However, the thermal conductivity of the composite is only slightly increased at a low loading of these thermal conductive fillers.…”

High thermal conductivity epoxies containing substituted biphenyl mesogenic

“…Thus, novel EP and its composites with high thermal conductivity are paid attractive attention to the application in the next generation of high performance electrical devices [1][2][3][4][5][6][7][8][9][10].…”