Fabrication of nano-Fe3O4 3D structure on carbon fibers as a microwave absorber and EMI shielding composite by modified EPD method
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]
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- DOI : http://dx.doi.org/10.1016/j.solidstatesciences.2016.12.005
- Elsevier : 저널> 권호 > 논문
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