A broadband and tunable microwave absorption technology enabled by VGCFs/PDMS–EP shape memory composites

Li, Xiang, Zhu, Yaofeng, Liu, Xuqing, Xu, Bin and Ni, Qingqing (2020) A broadband and tunable microwave absorption technology enabled by VGCFs/PDMS–EP shape memory composites. Composite Structures, 238. p. 111954. ISSN 0263-8223

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Official URL: https://doi.org/10.1016/j.compstruct.2020.111954

Abstract

A facile method for fabricating intelligent microwave absorber of vapor grown carbon fibers/Polydimethylsiloxane–epoxy resin shape memory composites (VGCFs/PDMS–SMEP) composites was proposed to deliver intelligently tunable and broadband microwave absorption performance. The maximal absorption intensity was regulated by varying the deformation of the composites driven by the superior shape memory property of SMEP, where practical the minimum reflection loss (RLmin) reaches -55.7 dB at 16.0 GHz with the thickness of 2.0 mm. The effective absorption bandwidth (EAB) reached 9.8 GHz, which covered the whole applied frequency range (8.2–18.0 GHz). The intelligent microwave absorption performance of the sample was attributed to robust conductive loss and dielectric loss enhanced by the dipole relaxations and multi-reflections. Thus, VGCFs/PDMS–SMEP composites serves as the key that really opens up opportunity for the application as flexible, shape memory and tunable high performance broadband microwave absorption absorber in frontiers such as wearable electronic devices, chips protection, stealth technology and information security.

Item Type: Article
Uncontrolled Keywords: Tunable microwave absorption, Frequency regulation, Shape memory, Wearable microwave absorber, VGCFs/PDMS
Subjects: F200 Materials Science
H700 Production and Manufacturing Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 17 Jan 2020 12:32
Last Modified: 10 Mar 2020 11:15
URI: http://nrl.northumbria.ac.uk/id/eprint/41932

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