Tailoring the input impedance of FeCo/C composites with efficient broadband absorption
- 4 October 2017
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Dalton Transactions
- Vol. 46 (43), 14926-14933
- https://doi.org/10.1039/c7dt02840g
Abstract
Proper impedance matching and strong attenuation capabilities are crucial factors for an excellent microwave absorbent. Significant attention and effort have been focused on the attenuation capabilities, whereas little attention has been paid to impedance matching, which is particularly important to design broadband absorbing materials. In this study, coin-like porous FeCo/C composites were successfully prepared by a simple carbon thermal reduction method. The Zin/Zo values of the FeCo/C composites were calculated to investigate the effects of the Fe/Co molar ratio and structure on the impedance matching. The results show that the coin-like porous samples were equipped with optimal impedance matching (Zin/Zo ≈ 1) and broad frequency bandwidth. The coin-like porous structure can induce multiple scattering and extend the travel path of the waves, which is in favour of electromagnetic loss. In this way, the effective frequency bandwidth (RL < −10 dB) as large as 6 GHz (from 11.36 to 17.36 GHz) has been achieved at a thickness of 2 mm when the Fe/Co molar ratio is 4 : 6. In addition, the average frequency broadband reached 5.57 GHz in the thickness range of 2–2.6 mm. We believe that this study may provide a new strategy for tuning the impedance matching for optimal broadband absorbers.Keywords
This publication has 45 references indexed in Scilit:
- Strong Electromagnetic Wave Response Derived from the Construction of Dielectric/Magnetic Media Heterostructure and Multiple InterfacesACS Applied Materials & Interfaces, 2017
- Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave AbsorberAdvanced Materials Interfaces, 2016
- Hybrid of MoS2 and Reduced Graphene Oxide: A Lightweight and Broadband Electromagnetic Wave AbsorberACS Applied Materials & Interfaces, 2015
- Investigation on the electromagnetic wave absorption properties of Ni chains synthesized by a facile solvothermal methodApplied Surface Science, 2014
- Laminated magnetic graphene with enhanced electromagnetic wave absorption propertiesJournal of Materials Chemistry C, 2013
- Microwave Absorption Properties of Carbon Nanocoils Coated with Highly Controlled Magnetic Materials by Atomic Layer DepositionACS Nano, 2012
- Enhanced microwave absorption of Fe nanoflakes after coating with SiO2nanoshellNanotechnology, 2010
- Microwave properties of surface modified Fe–Co–Zr alloy flakes with mechanochemically synthesized polystyreneJournal of Alloys and Compounds, 2009
- Morphology-controlled synthesis, growth mechanism, optical and microwave absorption properties of ZnO nanocombsJournal of Physics D: Applied Physics, 2008
- Thin electromagnetic wave absorber for quasi-microwave band containing aligned thin magnetic metal particlesIEEE Transactions on Magnetics, 1997