Absorption and Shielding Effect of Electromagnetic Wave at GHz Frequency by Multi-walled Carbon Nanotube/Polymer Composites

Author

Umishita, Kazunori ; Okubo, Tsuyoshi ; Takuya, Nakamura ; Hashimoto, Osamu

Author_Institution

Tsukuba Res. Lab., Hodogaya Chem. Co. Ltd., Ibaraki

fYear

2006

fDate

10-12 Sept. 2006

Firstpage

291

Lastpage

294

Abstract

The complex permittivity at 5.8 GHz of the composites of epoxy resin with multi-walled carbon nanotubes (MWCNTs) with their 20-70 nm diameters and 10-20 mum lengths at the concentration of 0.1-0.5% in weight was measured using a waveguide in order to develop the electromagnetic wave absorber (EMA) in the GHz frequency region. The EM absorbing efficiency was the highest at the MWCNT concentration of 0.2%, although the electric resistivity of the composite decreased and the electromagnetic interference shielding efficiency at 1-18 GHz increased with concentration of MWCNT over 0.5%. Such was observed even in various polymers including polycarbonate, polyacetal, polystyrene, acrylonitrile-butadiene-styrene copolymer, polymethylmethacrylate, and poly-etheretherketone

Keywords

carbon nanotubes; composite materials; electromagnetic shielding; electromagnetic wave absorption; microwave propagation; permittivity; polymers; waveguides; 10 to 20 micron; 20 to 70 nm; 5.8 GHz; EMA; MWCNT; electromagnetic shielding; electromagnetic wave absorber; epoxy resin composites; multiwalled carbon nanotubes; permittivity; waveguide; Carbon nanotubes; Electromagnetic scattering; Electromagnetic wave absorption; Electromagnetic waveguides; Epoxy resins; Frequency measurement; Length measurement; Permittivity measurement; Polymers; Weight measurement; Carbon nanotube; EM shielding effect; MWCNT; electromagnetic wave absorber; polymer composites;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Technology, 2006. The 9th European Conference on

Conference_Location

Manchester

Print_ISBN

2-9600551-5-2

Type

conf

DOI

10.1109/ECWT.2006.280494

Filename

4057497