Synthesis of chain-like ɑ-Fe/Fe3O4 core/shell composites exhibiting enhanced microwave absorption performance in high-frequency under an ultrathin matching thickness

Coaxial heterogeneous chain-like ɑ-Fe/Fe 3 O 4 composites were synthesized by a facile two-step solvothermal method. The ɑ-Fe nanochains were first obtained by a simple liquid phase reduction process, and the ɑ-Fe/Fe 3 O 4 core/shell composites were prepared by subsequent oxidation process. The elec...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2018-12, Vol.29 (24), p.21040-21050
Main Authors: Wang, Shipeng, Zhang, Min, Liu, Qiangchun, Zhang, Peng, Zhang, Kaiyin, Kong, Xiangkai
Format: Article
Language:English
Subjects:
Bandwidths
Chains
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composite materials
Core loss
Electric properties
Electromagnetic properties
Impedance matching
Iron oxides
Liquid phases
Low conductivity
Materials Science
Microwave absorption
Nanocomposites
Optical and Electronic Materials
Oxidation
Permeability
Reflection
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Summary:Coaxial heterogeneous chain-like ɑ-Fe/Fe 3 O 4 composites were synthesized by a facile two-step solvothermal method. The ɑ-Fe nanochains were first obtained by a simple liquid phase reduction process, and the ɑ-Fe/Fe 3 O 4 core/shell composites were prepared by subsequent oxidation process. The electromagnetic properties of ɑ-Fe/Fe 3 O 4 core/shell composites were measured with the coaxial reflection/transmission technique at 1.0–18.0 GHz. The ɑ-Fe/Fe 3 O 4 core/shell composites have an optimal absorption peak value of about − 25.6 dB at 16.3 GHz and its effective absorption bandwidth lower than − 10 dB reaches 3.6 GHz (from 14.4 to 18.0 GHz). Importantly, the optimal absorption peak matching thickness of the absorber is only 0.8 mm. The enhanced microwave absorption performance is mainly originated from good impedance matching, which is related to low conductivity and magnetic loss of the coaxial heterogeneous chain-like ɑ-Fe/Fe 3 O 4 core/shell composites. The reflection loss results indicate that the ɑ-Fe/Fe 3 O 4 core/shell composites with thin thickness, wide absorption bandwidth and strong absorption characteristics can be used as excellent microwave absorption material in the high-frequency region.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-018-0250-3