Journal
JOURNAL OF NANOPHOTONICS
Volume 6, Issue -, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.JNP.6.061715
Keywords
shielding; carbon foam; carbon nanotubes; epoxy resin; composites; microwaves
Categories
Funding
- ISTC project [B-1708]
- NATO project [PST.CLG.983910]
- EU [FP7-266529 BY-NanoERA, FP7-247007 CACOMEL, FP7-PEOPLE-2012-IRSES FAEMCAR]
- Italian Ministry PRIN
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster) through local (Conseil General des Vosges)
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster) through regional (Region Lorraine)
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster) through national (DRRT)
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster) through national FNADT)
- European (FEDER) funds
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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 microstructural 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 mu m). c 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.JNP.6.061715]
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