Onset of electrical percolation in onion-like Carbon/Poly(methyl methacrylate) composites

J. Macutkevic, P. Kuzhir, A. Paddubskaya, J. Banys, S. Maksimenko, S. Moseenkov, V.L. Kuznetsov, O. Shenderova, Philippe Lambin

    Research output: Contribution to journalArticlepeer-review


    The results of broadband dielectric spectroscopy of onion-like carbon (OLC) based Poly(methyl methacrylate) (PMMA) composites are reported in wide temperature range 300-450 K. The dielectric properties of OLC/PMMA composites are chiefly dependent on the preparation technique, in particular annealing above the glass transition temperature of composite with 20 wt.% of OLC inclusions causes the vanishing of β relaxation, electrical conductivity appearance and onset of percolation. The percolation threshold in OLC/PMMA composites is found to be close to 20 wt.%. Below the percolation threshold the dielectric properties of composites in temperature range 300-420 K are determined mainly by β relaxation. The activation energy of such a relaxation is weakly dependent on OLC concentration.
    Original languageEnglish
    Pages (from-to)1201-1206
    Number of pages6
    JournalNanoscience and Nanotechnology Letters
    Issue number11
    Publication statusPublished - 1 Nov 2013

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