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Electromagnetic shielding efficiency in Ka-band: Carbon foam versus epoxy/carbon nanotube composites

TitoloElectromagnetic shielding efficiency in Ka-band: Carbon foam versus epoxy/carbon nanotube composites
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2012
AutoriKuzhir, P.P., Paddubskaya A.G., Shuba M.V., Maksimenko S.A., Celzard A., Fierro V., Amaral-Labat G., Pizzi A., Valušis G., Macutkevic J., Ivanov M., Banys J., Bistarelli S., Cataldo Antonino, Mastrucci M., Micciulla F., Sacco I., Stefanutti E., and Bellucci S.
RivistaJournal of Nanophotonics
Volume6
ISSN19342608
Parole chiaveCarbon foam, Carbon nanotubes, Comparative studies, Composite materials, Electromagnetic shielding, Epoxy resins, Flexible epoxy resin, Foams, High electrical conductivity, High frequency HF, Interference shielding, Microwaves, Multiwalled carbon nanotubes (MWCN), Nanotube composites, Nanotubes, Pore size, Shielding, Small concentration
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 Ka-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). © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

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cited By 57

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84876357296&doi=10.1117%2f1.JNP.6.061715&partnerID=40&md5=d3dca78f93169c8558eca20ed7ed9e74
DOI10.1117/1.JNP.6.061715
Citation KeyKuzhir2012