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Abstract
In this work, multi-walled carbon nanotubes (MWCNTs)-epoxy composites with MWCNTs (outer diameter less 8 nm) loadings from 1 to 10 wt% were fabricated. The microstructures, dielectric constant, and microwave absorption properties of the MWCNTs-epoxy composite samples were investigated. The measurement results showed that the microwave absorption ratio of the MWCNTs-epoxy composite strongly depend on the MWCNT loading in the composites. The microwave absorption ratio up to 20%-26% around 18-20 GHz was reached for the samples with 8-10 wt% MWCNT loadings. The high absorption performance is mainly attributed to the microwave absorption of MWCNTs and the dielectric loss of MWCNTs-epoxy composites.
Highlights
Microwave absorbing materials are very important for many applications in modern technology including electronics and telecommunications [1]
The microwave absorption ratio up to 20% - 26% around 18 - 20 GHz was reached for the samples with 8 - 10 wt% multi-walled carbon nanotubes (MWCNTs) loadings
Multi-walled carbon nanotubes (MWCNTs)-polymer composites offer a large flexibility for design and control of microwave absorption behaviors, as the composites can be tailored through changes in loading fractions, matrix materials, complex permittivity and loss tangent of MWCNTs-polymer composites [1,16,17]
Summary
Microwave absorbing materials are very important for many applications in modern technology including electronics and telecommunications [1]. Carbon nanotubes (CNTs) and CNT composites have been emerging as new perspective microwave absorbers due to their fascinating physico-chemical properties such as light-weight, resistance to corrosion, high mechanical strength, larger flexibility and superior electrical performance [6,10,11,12,13]. Multi-walled carbon nanotubes (MWCNTs)-polymer composites offer a large flexibility for design and control of microwave absorption behaviors, as the composites can be tailored through changes in loading fractions, matrix materials, complex permittivity and loss tangent of MWCNTs-polymer composites [1,16,17]. The microwave absorbing properties of the MWCNTs-polymer composites depend on the CNT loading fraction, which can affect the absorption bandwidth and resonance frequency. We focused on the microwave absorption performance of the MWCNTsepoxy composites in a continuous frequency range from 2 to 18 GHz
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