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Journal Articles Polymer Year : 2013

Dielectric properties of reduced graphene oxide/polypropylene composites with ultralow percolation threshold

Abstract

In this paper, we report the preparation and dielectric properties of reduced graphene oxide/polypropylene (rGO/PP) composites with an ultralow percolation threshold as low as 0.033 vol%. This value is the lowest among those that have been reported in graphene-filled composites. The rGO/PP composites were prepared through a latex technique, which consists of an in-situ chemical reduction of graphene oxide in PP latex and a subsequent filtration. Scanning electron microscopy and X-ray diffraction measurements demonstrate that the homogeneous dispersion of rGO nanosheets in the PP matrix was realized. A blue shift in Raman G band of the rGO nanosheets was observed in the rGO/PP composites, indicating the strong interaction between the rGO filler and the PP matrix. In the frequency range from 10(2) Hz to 10(7) Hz, the rGO/PP composites showed an insulator-to-conductor percolation transition as the increase of the rGO loading. Near the percolation threshold, the dielectric permittivity of the rGO/PP composites underwent a significant change of three orders of magnitude. Moreover, the permittivity was found to be temperature dependent.
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Dates and versions

hal-01282426 , version 1 (03-03-2016)

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Dongrui Wang, Xiaoman Zhang, Jun-Wei Zha, Jun Zhao, Zhi-Min Dang, et al.. Dielectric properties of reduced graphene oxide/polypropylene composites with ultralow percolation threshold. Polymer, 2013, 54 (7), pp.1916-1922. ⟨10.1016/j.polymer.2013.02.012⟩. ⟨hal-01282426⟩
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