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Electromagnetic absorbing materials using nonwoven fabrics coated with multi-walled carbon nanotubes

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Title: Electromagnetic absorbing materials using nonwoven fabrics coated with multi-walled carbon nanotubes
Authors: Sano, Eiichi Browse this author →KAKEN DB
Akiba, Eiji Browse this author
Issue Date: Nov-2014
Publisher: Elsevier
Journal Title: Carbon
Volume: 78
Start Page: 463
End Page: 468
Publisher DOI: 10.1016/j.carbon.2014.07.027
Abstract: We calculated the complex permittivity of materials required to achieve a single-layer electromagnetic absorber with a high absorption coefficient in the 60-GHz band. The calculation results indicated that an absorption coefficient of 0.95 can be achieved, for a 5-mm sheet when the real part of the relative permittivity epsilon' is close to that of the free space and the conductivity sigma is around 3 S/m. On the basis of the findings, we developed three types of nonwoven fabrics with high porosity in which the fibers were coated with multiwalled carbon nanotubes (MWCNTs). The epsilon' of 1.12-1.32 and a of 0.107-12.4 S/m were obtained depending on the porosity of the fabrics. The measured absorption coefficients reached 0.97 at 60 GHz in agreement with the calculations. The present MWCNTs-coated nonwoven fabrics will be useful materials for high performance electromagnetic absorbers. (C) 2014 Elsevier Ltd. All rights reserved.
Type: article (author version)
Appears in Collections:量子集積エレクトロニクス研究センター (Research Center for Integrated Quantum Electronics) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐野 栄一

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