PANI/FeCo@C composite microspheres with broadband microwave absorption performance

Composite microwave absorbers with multiple loss mechanism have attracted more and more attention. Herein, we report a strategy of step-by-step synthesis of polyaniline (PANI)/FeCo@C composite microspheres by hydrothermal, calcination and in-situ polymerization. The multilayer heterogeneous interfac...

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Bibliographic Details
Published inComposites science and technology Vol. 218; p. 109143
Main Authors Tan, Ruiyang, Zhou, Fangkun, Chen, Ping, Zhang, Baoshan, Zhou, Jintang
Format Journal Article
LanguageEnglish
Published Barking Elsevier Ltd 08.02.2022
Elsevier BV
Subjects
Bandwidths
Broadband
Composite materials
Conduction losses
Core shell
Dipoles
Electromagnetic properties
Ferrous alloys
Microspheres
Microwave absorbers
Microwave absorption
Molecular chains
Multilayer
Multilayers
Optimization
Polyaniline
Polyanilines
Polymerization
Synergistic effect
Microwave absorption
Multilayer
Polyaniline
Electromagnetic properties
Core shell
Online AccessGet full text
ISSN0266-3538
1879-1050
DOI10.1016/j.compscitech.2021.109143

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Summary:Composite microwave absorbers with multiple loss mechanism have attracted more and more attention. Herein, we report a strategy of step-by-step synthesis of polyaniline (PANI)/FeCo@C composite microspheres by hydrothermal, calcination and in-situ polymerization. The multilayer heterogeneous interfaces of microspheres and the multi dipole center of polyaniline molecular chain significantly improve the polarization relaxation loss. Polyaniline on the surface connects the microspheres to form a conductive network, which effectively enhances the conduction loss. FeCo alloy particles also provide a certain magnetic loss. Their synergistic effect makes the composite microspheres exhibit good microwave absorption performance. When the thickness of P2 is only 1.7 mm, it could exhibit an effective absorption bandwidth (EAB) of 5.31 GHz and maximum reflection loss (RL) of −33.86 dB. Moreover, we optimized the macro structure of the absorber through gradient design, and successfully extended the effective absorption bandwidth to 11.81 GHz by introducing multiple interference. This work provides a useful reference for the comprehensive optimization of micro regulation and macro design of composite microwave absorbers. [Display omitted]
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ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2021.109143