Issue 33, 2015

Facile synthesis of porous coin-like iron and its excellent electromagnetic absorption performance

Abstract

In this paper a novel electromagnetic absorbent, porous coin-like iron with a diameter of ∼10 μm and a thickness of 2 μm, was fabricated using a hydrogen gas reduction process. This special porous coin-like structure was attributed to a decrease in density and exceeded the Snoek limitation. It was observed that these coin-like iron structures exhibit excellent microwave absorption properties. An optimal reflection loss value of −53.2 dB was obtained at 16 GHz, moreover, the effective frequency bandwidth could be up to 6.3 GHz (11.7–18 GHz) at a thickness of 1.4 mm. The microwave absorption mechanism may have originated from the following factors: firstly, these coin-like irons were favorable for obtaining a lower real part of permittivity value and thus gained the improvement of impedance matching behavior, as compared with other reported irons. Secondly, the coin-like morphology exhibited a strong magnetic loss ability. Further analysis revealed that the magnetic loss mechanism may rely mainly on the resonance. In addition, the porous feature of the coin-like iron offered a rough surface on the large size of the coin-like structure, which was beneficial for electromagnetic wave scattering and further enhanced their microwave absorption properties.

Graphical abstract: Facile synthesis of porous coin-like iron and its excellent electromagnetic absorption performance

Article information

Article type
Paper
Submitted
11 Jan 2015
Accepted
25 Feb 2015
First published
26 Feb 2015

RSC Adv., 2015,5, 25936-25941

Facile synthesis of porous coin-like iron and its excellent electromagnetic absorption performance

H. Lv, X. Liang, Y. Cheng, G. Ji, D. Tang, B. Zhang, H. Zhang and Y. Du, RSC Adv., 2015, 5, 25936 DOI: 10.1039/C5RA00598A

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