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Journal of Materials Science: Materials in Electronics
Published in: Journal of Materials Science: Materials in Electronics 24/2017

11-09-2017

Fabrication of ternary CoNi@SiO2@RGO composites with enhanced electromagnetic (EM) wave absorption performances

Authors: Suhua Zhou, Ying Huang, Jing Yan, Xiaopeng Han, Xuefang Chen

Published in: Journal of Materials Science: Materials in Electronics | Issue 24/2017

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Abstract

The ternary hybrids composed of a CoNi inner unit along with SiO2 and graphene outer units (CoNi@SiO2@RGO) are synthesized via a facile solvothermal/sol–gel/hydrothermal strategy. The structures, chemical composition and morphologies of CoNi, CoNi@SiO2 and CoNi@SiO2@RGO are analyzed in detail. Besides, the electromagnetic (EM) wave absorption performances of the as-prepared products are invested on the basis of transmission lines theory. The results indicate that the ternary CoNi@SiO2@RGO composites display enhanced microwave-absorbing characteristics in terms of both the maximum reflection loss and the absorption bandwidth, compared with the pristine CoNi alloy and CoNi@SiO2 microparticles. The maximum RL of CoNi@SiO2@RGO reaches as high as −50.3 dB at 6.8 GHz, and the absorption bandwidth below −10 dB is up to 4.0 GHz with a thickness of 4 mm. A possible mechanism of microwave absorption is explained, drawing a conclusion that the improvement of absorption property is mainly ascribed to the synergic effect of combining magnetic and dielectric components, and the interface interactions of multi-component hierarchical structure.
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Metadata
Title
Fabrication of ternary CoNi@SiO2@RGO composites with enhanced electromagnetic (EM) wave absorption performances
Authors
Suhua Zhou
Ying Huang
Jing Yan
Xiaopeng Han
Xuefang Chen
Publication date
11-09-2017
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 24/2017
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-017-7804-7

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