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Solid state sciences v.64, 2017년, pp.51 - 61   SCI SCIE
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Fabrication of nano-Fe3O4 3D structure on carbon fibers as a microwave absorber and EMI shielding composite by modified EPD method

Gholampoor, Mahdi (Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran ); Movassagh-Alanagh, Farid ( Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran ); Salimkhani, Hamed ( Department of Materials Engineering, University of Tabriz, Tabriz, Iran );
  • 초록  

    Abstract Recently, electromagnetic interference (EMI) shielding materials have absorbed a lot of attention due to a growing need for application in the area of electronic and wireless devices. In this study, a carbon-based EMI shielding composite was fabricated by electrophoretic deposition of Fe 3 O 4 nano-particles on carbon fibers (CFs) as a 3D structure incorporated with an epoxy resin. Co-precipitation method was employed to synthesize Fe 3 O 4 nano-particles. This as-synthesized Fe 3 O 4 nano-powder was then successfully deposited on CFs using a modified multi-step electrophoretic deposition (EPD) method. The results of structural studies showed that the Fe 3 O 4 nano-particles (25?nm) were successfully and uniformly deposited on CFs. The measured magnetic properties of as-synthesized Fe 3 O 4 nano-powder and nano-Fe 3 O 4 /CFs composite showed that the saturation magnetization of bare Fe 3 O 4 was decreased from M s ?=?72.3 emu/g to M s ?=?33.1 emu/g for nano-Fe 3 O 4 /CFs composite and also corecivity of Fe 3 O 4 was increased from H c ?=?4.9?Oe to H c ?=?168?Oe for composite. The results of microwave absorption tests revealed that the reflection loss (RL) of an epoxy-based nano-Fe 3 O 4 /CFs composite are significantly influenced by layer thickness. The maximum RL value of?−10.21?dB at 10.12?GHz with an effective absorption bandwidth about 2?GHz was obtained for the sample with the thickness of 2?mm. It also exhibited an EMI shielding performance of?−23?dB for whole the frequency range of 8.2–12.4?GHz. Highlights A Nano-sized Fe 3 O 4 powder is successfully fabricated by simple and cost-effective co-precipitation method. As-synthesized nano-Fe 3 O 4 powder is deposited on carbon fibers using a modified electrophoretic deposition (EPD) method. The physicochemical, magnetic, microwave absorption and EMI shielding properties of nano-Fe 3 O 4 /CFs composites analyzed. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Electromagnetic interference shielding .   Nano-Fe3O4 coated carbon fibers .   Electrophoretic deposition .   Magnetic materials.  

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