open access

https://hdl.handle.net/2115/57441

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

英語

2014-11

Elsevier

Carbon

78

463-468

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.

学術雑誌論文

Accepted Manuscript

0008-6223