FeCo/ZnO composites with enhancing microwave absorbing properties: effect of hydrothermal temperature and time

FeCo/ZnO composites were successfully synthesized by a simple one-step hydrothermal process. It is clearly seen that the pencil-like ZnO particles with 3-4 μm in length and 200-300 nm in width are found to grow along the surface of the hexagonal-cone FeCo particles, which form a discontinuous conduc...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (11), p.57529-57533
Main Authors: Lv, Hualiang, Ji, Guangbin, Wang, Min, Shang, Chaomei, Zhang, Haiqian, Du, Youwei
Format: Article
Language:English
Subjects:
Absorption
Antennas
Microwave absorption
Microwaves
Noise levels
Particulate composites
Reflection
Zinc oxide
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Summary:FeCo/ZnO composites were successfully synthesized by a simple one-step hydrothermal process. It is clearly seen that the pencil-like ZnO particles with 3-4 μm in length and 200-300 nm in width are found to grow along the surface of the hexagonal-cone FeCo particles, which form a discontinuous conductive network. Enhanced microwave absorption properties can be obtained for the FeCo/ZnO composites as compared to those of pure FeCo alloy, which is mainly attributed to the better resonance according to an isotropic antenna mechanism. Further investigation confirms that the hydrothermal temperature ( T ) and time ( t ) play a key role on the real part of the permittivity values of the FeCo/ZnO composites and indirectly affect the microwave absorbing properties. It is surprising to find out that the composite prepared at 150 °C for 12 hours, exhibited the optimal reflection loss of −31 dB with a 5.5 GHz effective frequency bandwidth. The FeCo/ZnO composite has been successfully synthesized by a simple hydrothermal approach. The special structure has attributed the excellent microwave absorption properties with the optimal reflection loss up to -31 dB under the frequency bandwidth of 5.5 GHz.
ISSN:2046-2069
2046-2069
DOI:10.1039/c4ra09862e