Electromagnetic properties of graphene nanoplatelets/epoxy composites

A. Plyushch, J. Macutkevic, P. Kuzhir, J. Banys, Dz Bychanok, Philippe Lambin, S. Bistarelli, A. Cataldo, F. Micciulla, S. Bellucci

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    Results of broadband dielectric spectroscopy of epoxy resin composites containing graphene nanoplatelets (GNP) are presented in a wide temperature range (25-500 K). The as-produced composites were heated at temperatures above the epoxy glass transition and subsequently cooled down to room temperature. This annealing was proved to be a simple but powerful process to improve significantly the electromagnetic properties of the GNP-based composites. The dc conductivity of epoxy filled with 4 wt% GNP is 68 times higher after annealing. Another benefit of the annealing is to lower substantially the percolation threshold, from 2.3 wt% for as-produced samples to 1.4 wt%. In composites above the percolation threshold, the electrical conductivity is the result of tunneling between GNP clusters. For a given GNP concentration, the tunnel barrier decreases after annealing.

    Original languageEnglish
    Pages (from-to)75-83
    Number of pages9
    JournalComposites Science and Technology
    Publication statusPublished - 22 Mar 2016


    • Annealing
    • Electrical properties
    • Nano particles
    • Polymer-matrix composites (PMCs)
    • Thermal properties


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