Electromagnetic interference shielding of flexible carboxymethyl cellulose/MWCNT@Fe3O4 composite film with ultralow reflection loss

Nowadays, various high-performance electromagnetic interference (EMI) shielding materials have enormous application potential in electronic field. However, traditional EMI shielding materials often have high conductivity, resulting in the serious mismatch between the impedance of the material surfac...

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Bibliographic Details
Published in:International journal of biological macromolecules 2024-02, Vol.257, p.128604-128604, Article 128604
Main Authors: Dai, Yaohui, Xu, Ying, Jiang, Dexing, Bai, Long, Li, Zhiguo, Huo, Pengfei, Liu, Changwei, Liu, Yang
Format: Article
Language:English
Subjects:
Carbon nanotubes
Carboxymethyl cellulose
EMI shielding
Fe3O4
Low reflection
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Summary:Nowadays, various high-performance electromagnetic interference (EMI) shielding materials have enormous application potential in electronic field. However, traditional EMI shielding materials often have high conductivity, resulting in the serious mismatch between the impedance of the material surface and the free space, which will cause a large amount of reflection of electromagnetic (EM) waves, leading to secondary reflection pollution. In this paper, we report a novel flexible EMI shielding composite film with extremely low reflection loss and efficient EM wave absorption, which was prepared by assisted self-assembly based on simple vacuum filtration using carboxymethyl cellulose as the matrix and MWCNT@Fe3O4 synthesized by chemical coprecipitation as the composite functional filler. By adjusting the Fe3O4 coating degree of MWCNTs in the filler, the composite film achieved the construction of a conductive network with high Fe3O4 content. Benefit by the good adaptability of conductivity and magnetic permeability, the composite film has good impedance matching ability and microwave absorption performance. The reflection loss of the composite film with the thickness of 28 μm in the X-band was only 0.23 dB, accounting for 1.7 % of the total loss. This work provides new insights for the development of EMI materials and effective mitigation secondary EM wave reflection pollution. [Display omitted] •MWCNT@Fe3O4 composite fillers were synthesized by chemical coprecipitation.•Ultrathin and flexible CMC/MWCNT@Fe3O4 composites film were prepared.•Simultaneously achieved ultra-low EM wave reflection and efficient EM wave absorption.•The EMI shielding mechanism of the composite membrane had been clarified.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2023.128604