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Dielectric spectroscopy of high aspect ratio graphene-polyurethane nanocomposites

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Abstract

High aspect ratio graphene nanosheets (GNS), prepared via liquid exfoliation, are homogeneously dispersed in thermoplastic polyurethane (TPU). Dielectric spectroscopy results are reported for these nanocomposites (up to 0.55 vol. % GNS) in the frequency range of 100 Hz to 5 MHz. The as-prepared GNS increased the AC conductivity 10–1000 times across the given frequency range. The dielectric constant is increased 5–6 times at 100 Hz for the maximum loading of GNS when compared with the pristine TPU, with subsequently high dielectric loss making them a suitable candidate for high energy dissipation applications such as EMI shielding. The temperature effects on the dielectric characteristics of 0.55 vol. % GNS/TPU nanocomposites beyond 400 K are more pronounced due to the interfacial and orientation polarization. Mechanical characteristics evaluation of GNS/TPU composites shows a marked increase in the ultimate tensile strength without compromising their ductility and stiffness.

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Authors and Affiliations

  1. School of Chemical & Materials Engineering (SCME), National University of Sciences & Technology (NUST), H-12 Campus, Islamabad, 44000, Pakistan

    Rahim Jan, Amir Habib, Hina Abbassi & Shahid Amir

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  1. Rahim Jan
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  2. Amir Habib
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  3. Hina Abbassi
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  4. Shahid Amir
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Correspondence to Rahim Jan.

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Jan, R., Habib, A., Abbassi, H. et al. Dielectric spectroscopy of high aspect ratio graphene-polyurethane nanocomposites. Electron. Mater. Lett. 11, 225–231 (2015). https://doi.org/10.1007/s13391-014-4265-5

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  • DOI: https://doi.org/10.1007/s13391-014-4265-5

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