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Journal of Nanophotonics

Electromagnetic shielding efficiency in Ka-band: carbon foam versus epoxy/carbon nanotube composites
Author(s): Polina P. Kuzhir; Alesia G. Paddubskaya; Mikhail V. Shuba; Sergey A. Maksimenko; Alain Celzard; Vanessa Fierro; Gisele Amaral-Labat; Antonio Pizzi; Gintaras Valušis; Jan Macutkevic; Maksim Ivanov; Juras Banys; Silvia Bistarelli; Antonino Cataldo; Matteo Mastrucci; Federico Micciulla; Immacolata Sacco; Eleonora Stefanutti; Stefano Bellucci
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Paper Abstract

The wide application of microwaves stimulates searching for new materials with high electrical conductivity and electromagnetic (EM) interference shielding effectiveness (SE). We conducted a comparative study of EM SE in K a -band demonstrated by ultra-light micro-structural porous carbon solids (carbon foams) of different bulk densities, 0.042 to 0.150  g/cm 3 , and conventional flexible epoxy resin filled with carbon nanotubes (CNTs) in small concentrations, 1.5 wt.%. Microwave probing of carbon foams showed that the transmission through a 2 mm-thick layer strongly decreases with decreasing the pore size up to the level of 0.6%, due to a rise of reflectance ability. At the same time, 1 mm thick epoxy/CNT composites showed EM attenuation on the level of only 66% to 37%. Calculating the high-frequency axial CNTs' polarizability on the basis of the idea of using CNT as transmission lines, we devised a strategy to improve the EM SE of CNT-based composites: because of the high EM screening of inner shells of multi-walled CNTs in the GHz range, it is effective to use either single-walled CNT or multi-walled CNTs with a relatively small number of walls (up to 15, i.e., those taking part in the EM interaction, if the CNT length is 20 μm).

Paper Details

Date Published: 10 December 2012
PDF: 19 pages
J. Nanophoton. 6(1) 061715 doi: 10.1117/1.JNP.6.061715
Published in: Journal of Nanophotonics Volume 6, Issue 1
Show Author Affiliations
Polina P. Kuzhir, Belarusian State Univ. (Belarus)
Alesia G. Paddubskaya, Belarusian State Univ. (Belarus)
Mikhail V. Shuba, Belarusian State Univ. (Belarus)
Sergey A. Maksimenko, Belarusian State Univ. (Belarus)
Alain Celzard, Univ. Nancy (France)
Vanessa Fierro, Univ. Nancy (France)
Gisele Amaral-Labat, Univ. Nancy (France)
Antonio Pizzi, Univ. Nancy (France)
Gintaras Valušis, Ctr. for Physical Sciences and Technology (Lithuania)
Jan Macutkevic, Vilnius Univ. (Lithuania)
Maksim Ivanov, Vilnius Univ. (Lithuania)
Juras Banys, Vilnius Univ. (Lithuania)
Silvia Bistarelli, Istituto Nazionale di Fisica Nucleare (Italy)
Antonino Cataldo, Istituto Nazionale di Fisica Nucleare (Italy)
Matteo Mastrucci, Istituto Nazionale di Fisica Nucleare (Italy)
Federico Micciulla, Istituto Nazionale di Fisica Nucleare (Italy)
Immacolata Sacco, Istituto Nazionale di Fisica Nucleare (Italy)
Eleonora Stefanutti, Istituto Nazionale di Fisica Nucleare (Italy)
Stefano Bellucci, Instituto Nazionale di Fisica Nucleare (Italy)

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