Facile Synthesis of Porous Nickel/Carbon Composite Microspheres with Enhanced Electromagnetic Wave Absorption by Magnetic and Dielectric Losses

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Abstract
Porous nickel/carbon (Ni/C) composite microspheres with diameters of ca. 1.2-1.5 μm were fabricated by a solvothermal method combining with carbon reduction. The pore size of the synthesized Ni/C composite microspheres is ranged from several to 50 nm. The porous Ni/C composite microspheres exhibited saturation magnetization (MS) of 53.5 emu g-1 and coercivity (HC) of 51.4 Oe. When tested as electromagnetic wave (EM) absorption material, the epoxy resin composites containing 60% and 75% porous Ni/C microspheres provided high-performance EM absorption at the thicknesses of 3.0-11.0 mm and 1.6-7.0 mm in the corresponding frequency range of 2.0-12 GHz and 2.0-18 GHz, respectively. The superior EM absorption performances of porous Ni/C composite microspheres derived from the synergy effects generated by the magnetic loss of nickel, the dielectric loss of carbon, as well as the porous structure.
Funding Information
  • Science and Technology Development Plan (2014GGX102004)
  • National Natural Science Foundation of China (51572157)
  • Natural Science Fund for Distinguished Young Scholars of Shandong (JQ201312)
  • Fundamental Research Funds of Shandong University (2015JC016, 2015JC036)

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