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<p>Graphene-based composites functionalized with magnetic nanomaterials exhibit significant application potential in thermal conduction and electromagnetic interference (EMI) shielding. However, the uniform dispersion of magnetic nanomaterials within the graphene framework still poses a challenge. Drawing inspiration from wall masonry, this work employed hydrothermal and self-assembly strategy to prepare Ni(OH)₂ nanosheets/graphene oxide (GO) composite films with a “brick−mortar” lamellar structure, which were then converted into Ni nanocubes/graphene composite films (NGF) through a thermal treatment process. Ni nanocubes are uniformly distributed in the graphene film, providing fast channels for the transmission of electrons/phonons, and improving impedance matching and electromagnetic loss ability. Owing to these advantages, the obtained NGF exhibits a high thermal conductivity of 817 W&#xa0;m⁻<sup>1</sup>&#xa0;K⁻<sup>1</sup> and an electrical conductivity of 1504 S cm⁻<sup>1</sup>. Moreover, the EMI shielding effectiveness of NGF reaches up to 55&#xa0;dB in the X-band (8.2–12.4&#xa0;GHz) at an ultrathin thickness of only 17&#xa0;μm. This study presents a reliable strategy for fabricating high-performance magnetic graphene films with integrated thermal conductivity and EMI shielding functionalities.</p>

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Ni nanocubes/graphene composite films with “brick–mortar” structure for thermal management and electromagnetic interference shielding

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Wei Liu,
  • Kun Jia,
  • Tingting Yao,
  • Lazhen Shen,
  • Donghong Wang

摘要

Graphene-based composites functionalized with magnetic nanomaterials exhibit significant application potential in thermal conduction and electromagnetic interference (EMI) shielding. However, the uniform dispersion of magnetic nanomaterials within the graphene framework still poses a challenge. Drawing inspiration from wall masonry, this work employed hydrothermal and self-assembly strategy to prepare Ni(OH)₂ nanosheets/graphene oxide (GO) composite films with a “brick−mortar” lamellar structure, which were then converted into Ni nanocubes/graphene composite films (NGF) through a thermal treatment process. Ni nanocubes are uniformly distributed in the graphene film, providing fast channels for the transmission of electrons/phonons, and improving impedance matching and electromagnetic loss ability. Owing to these advantages, the obtained NGF exhibits a high thermal conductivity of 817 W m⁻1 K⁻1 and an electrical conductivity of 1504 S cm⁻1. Moreover, the EMI shielding effectiveness of NGF reaches up to 55 dB in the X-band (8.2–12.4 GHz) at an ultrathin thickness of only 17 μm. This study presents a reliable strategy for fabricating high-performance magnetic graphene films with integrated thermal conductivity and EMI shielding functionalities.