Super-high-frequency shielding properties of excimer-laser-synthesized-single-wall-carbon-nanotubes/polyurethane nanocomposite films

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3574443· OSTI ID:21560184

Aiessa, B; Habib, M A; Denidni, T A; El Khakani, M A ^[1]; Laberge, L L; Therriault, D ^[2]

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1. Institut National de la Recherche Scientifique, INRS-Energie, Materiaux et Telecommunications, 1650 Blvd. Lionel Boulet, C.P. 1020, Varennes, Quebec, J3X 1S2 (Canada)
2. Mechanical Engineering Department, Ecole Polytechnique de Montreal, P.O. Box 6079, Montreal, H3C 3A7 (Canada)

Electromagnetic shielding attenuation (ESA) properties of carbon nanotubes/polymer nanocomposite films, in the super high frequency (SHF) X-band (7-12 GHz) domain are studied. The nanocomposite films consisted of thermoset polyurethane (PU) resin blended with single-walled carbon nanotubes (SWCNTs) mats, and deposited on fused quartz substrates. Two different approaches were used to achieve the nanocomposite films, namely (i) through the on-substrate ''all-laser'' growth approach of SWCNTs directly onto substrate, followed by their infiltration by the PU resin, and (ii) by appropriately dispersing the chemically-purified SWCNTs (in the soot form) into the PU matrix and their subsequent deposition onto quartz substrates by means of a solvent casting process. Characterizations of the ESA properties of the developed nanocomposite films show that they exhibit systematically a deep shielding band, centered at around 9.5 GHz, with an attenuation as high as |- 30| dB, recorded for SWCNT loads of 2.5 wt. % and above. A direct correlation is established between the electrical conductivity of the nanocomposite films and their electromagnetic shielding capacity. The SWCNTs/PU nanocomposites developed here are highly promising shielding materials as SHF notch filters, as their ESA capacity largely exceeds the target value of |- 20| dB generally requested for commercial applications.

• OSTI ID: 21560184
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 8; Other Information: DOI: 10.1063/1.3574443; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABLATION
ATTENUATION
CAPACITY
CARBON
COMPOSITE MATERIALS
CORRELATIONS
DEPOSITION
ELECTRIC CONDUCTIVITY
EXCIMER LASERS
FILMS
NANOTUBES
POLYURETHANES
QUARTZ
SHIELDING
SHIELDING MATERIALS
SOLVENTS
SUBSTRATES
ELECTRICAL PROPERTIES
ELEMENTS
GAS LASERS
LASERS
MATERIALS
MINERALS
NANOSTRUCTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDE MINERALS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYAMIDES
POLYMERS
SYNTHETIC MATERIALS