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Enhanced Electromagnetic Absorption of Flake Carbonyl Iron/Reduced Graphene Oxide Composites

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Abstract:

Carbonyl iron is an excellent microwave absorption material. However, the high density limits its application in lightweight microwave absorbing. In this study, flake carbonyl iron (FCI) was prepared by high-energy ball milling, and mixed with TPU to prepare the TPU/FCI composites. The large shape anisotropy of FCI makes the TPU/FCI samples exhibit higher permittivity and permeability, and consequently better microwave absorption performance than TPU/SCI (spherical carbonyl iron). Then, rGO was added into the TPU/FCI composites. The permittivity of the TPU/FCI/rGO composites is significantly enhanced by a few amount of rGO (less than 0.5 wt.%). As a result, the TPU/FCI/rGO sample with mFCI: mTPU = 3:10 and 0.5 wt.% rGO consumes only half of FCI that the TPU/FCI sample with mFCI: mTPU = 6:10 uses, and shows much better microwave absorbing performance than this TPU/FCI sample, that the minimum reflection loss reaches-68.3 dB (at 3.4 mm) and the effective absorption bandwidth is up to 5.9 GHz (at 1.5 mm). The TPU/FCI/rGO materials demonstrate promising application in light-weight high-efficient microwave attenuation.

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Periodical:

Materials Science Forum (Volume 1070)

Pages:

45-54

DOI:

https://doi.org/10.4028/p-6b3t8n

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Online since:

October 2022

Authors:

Shi Qiao Liu*, Lin Wang, Zi Xuan You, De Bao Fang, Hai Bo Jin, Jing Bo Li

Keywords:

Carbonyl Iron, Impendence Matching, Microwave Absorption, RGO

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© 2022 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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