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Highly Aligned Graphene/Polymer Nanocomposites with Excellent Dielectric Properties for High-Performance Electromagnetic Interference Shielding

Advanced materials (Weinheim), 2014-08, Vol.26 (31), p.5480-5487 [Peer Reviewed Journal]

2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim ;2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. ;ISSN: 0935-9648 ;EISSN: 1521-4095 ;DOI: 10.1002/adma.201305293 ;PMID: 24715671

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  • Title:
    Highly Aligned Graphene/Polymer Nanocomposites with Excellent Dielectric Properties for High-Performance Electromagnetic Interference Shielding
  • Author: Yousefi, Nariman ; Sun, Xinying ; Lin, Xiuyi ; Shen, Xi ; Jia, Jingjing ; Zhang, Biao ; Tang, Benzhong ; Chan, Mansun ; Kim, Jang-Kyo
  • Subjects: aligned graphene sheets ; Alignment ; Anisotropy ; dielectric constant ; Dielectric properties ; electrical conductivity ; Electrically conductive ; Electromagnetic interference shielding ; EMI shielding efficiency ; Graphene ; Nanocomposites ; Noise levels ; polymer nanocomposite
  • Is Part Of: Advanced materials (Weinheim), 2014-08, Vol.26 (31), p.5480-5487
  • Description: Nanocomposites that contain reinforcements with preferred orientation have attracted significant attention because of their promising applications in a wide range of multifunctional fields. Many efforts have recently been focused on developing facile methods for preparing aligned graphene sheets in solvents and polymers because of their fascinating properties including liquid crystallinity and highly anisotropic characteristics. Self‐aligned in situ reduced graphene oxide (rGO)/polymer nanocomposites are prepared using an all aqueous casting method. A remarkably low percolation threshold of 0.12 vol% is achieved in the rGO/epoxy system owing to the uniformly dispersed, monolayer graphene sheets with extremely high aspect ratios (>30000). The self‐alignment into a layered structure at above a critical filler content induces a unique anisotropy in electrical and mechanical properties due to the preferential formation of conductive and reinforcing networks along the alignment direction. Accompanied by the anisotropic electrical conductivities are exceptionally high dielectric constants of over 14000 with 3 wt% of rGO at 1 kHz due to the charge accumulation at the highly‐aligned conductive filler/insulating polymer interface according to the Maxwell‐Wagner‐Sillars polarization principle. The highly dielectric rGO/epoxy nanocomposites with the engineered structure and properties present high performance electromagnetic interference shielding with a remarkable shilding efficiency of 38 dB. Nanocomposites consisting of self‐aligned reduced graphene oxide (rGO) sheets with extremely high aspect ratios (>30 000) in an epoxy matrix have a unique anisotropy in multi‐functional properties. They present an exceptionally high dielectric constant of over 14 000 at 1 kHz and a remarkable electromagnetic interference shielding efficiency of 38 dB at 3 wt% rGO.
  • Publisher: Germany: Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 0935-9648
    EISSN: 1521-4095
    DOI: 10.1002/adma.201305293
    PMID: 24715671
  • Source: Alma/SFX Local Collection
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