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

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• 作者：Song Qiu ; Hailong Lyu ; Jiurong Liu ; Yuzhen Liu ; Nannan Wu ; Wei Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：8
• 期：31
• 页码：20258-20266
• 全文大小：677K
• 年卷期：0
• ISSN：1944-8252

文摘

Porous nickel/carbon (Ni/C) composite microspheres with diameters of ca. 1.2–1.5 μm were fabricated by a solvothermal method combined with carbon reduction. The pore size of the synthesized Ni/C composite microspheres ranged from several nanometers to 50 nm. The porous Ni/C composite microspheres exhibited a saturation magnetization (M_S) of 53.5 emu g^–1 and a coercivity (H_C) of 51.4 Oe. When tested as an electromagnetic (EM) wave absorption material, the epoxy resin composites containing 60% and 75% porous Ni/C microspheres provided high-performance EM wave absorption at thicknesses of 3.0–11.0 and 1.6–7.0 mm in the corresponding frequency ranges of 2.0–12 and 2.0–18 GHz, respectively. The superior EM wave absorption performances of porous Ni/C composite microspheres were derived from the synergy effects generated by the magnetic loss of nickel, the dielectric loss of carbon, and the porous structure.