Fabrication of nano-Fe3O4 3D structure on carbon fibers as a microwave absorber and EMI shielding composite by modified EPD method

作者：Gholampour Mandi^*; Movassagh Alanagh Farid; Salimkhani Harried

来源：Solid State Sciences, 2017, 64: 51-61.

DOI：10.1016/j.solidstatesciences.2016.12.005

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

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 Fe3O4 nano-particles on carbon fibers (CFs) as a 3D structure incorporated with an epoxy resin. Co-precipitation method was employed to synthesize Fe3O4 nano-particles. This as-synthesized Fe3O4 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 Fe3O4 nano-particles (25 nm) were successfully and uniformly deposited on CFs. The measured magnetic properties of as-synthesized Fe3O4 nano-powder and nano-Fe3O4/CFs composite showed that the saturation magnetization of bare Fe3O4 was decreased from M-s = 72.3 emu/g to M-s = 33.1 emu/g for nano-Fe3O4/CFs composite and also corecivity of Fe3O4 was increased from H-c = 4.9 Oe to H-c = 168 Oe for composite. The results of microwave Fe3O4 tests revealed that the reflection loss (RL) of an epoxy-based nano-Fe3O4/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.

• 出版日期2017-2