Abstract
Graphene nanoplatelet (GNP)–polystyrene nanocomposites filled with up to 20 wt.% GNPs were prepared by melt mixing. The microstructure, direct-current (dc) electrical percolation behavior, and dielectric characteristics were investigated as functions of frequency. In addition, the effects of dc bias on the complex impedance and charge transport mechanisms were explored. The dc electrical percolation curve showed a gradually transition from the insulating to conducting state. At 15 wt.% GNP loading and frequency greater than 104 Hz, the nanocomposite exhibited dielectric constant and loss factor of 180 and 0.11, respectively, revealing remarkable storage capabilities at high frequencies. For nanocomposites filled with 12 wt.% to 20 wt.% GNPs, the alternating-current conductivity was found to follow the universal dynamic response behavior, implying electron conduction due to tunneling in addition to direct contact between GNPs.
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Al-Saleh, M.H., Abdul Jawad, S. Graphene Nanoplatelet–Polystyrene Nanocomposite: Dielectric and Charge Storage Behaviors. J. Electron. Mater. 45, 3532–3539 (2016). https://doi.org/10.1007/s11664-016-4505-6
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DOI: https://doi.org/10.1007/s11664-016-4505-6