Journal
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Volume 54, Issue 1, Pages 17-27Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEMC.2011.2178853
Keywords
Effective permittivity; electromagnetic shielding; graphene; graphite nanoplatelets (GNPs); nanocomposites; radar-absorbing materials (RAMs)
Funding
- European Commission [GA 205294]
- Ministry of Education [2008NMRHJS]
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Graphite nanoplatelets (GNPs) are bidimensional carbon nanostructures consisting of stacks of graphene sheets, having thickness in the range from one up to a few tens of nanometers, and lateral linear dimension in the micrometer range. These nanostructures represent a good candidate to replace carbon nanotubes in composites for electromagnetic applications. This paper proposes a new model based on the Maxwell-Garnett approach to compute the effective complex permittivity of GNP-filled nanocomposites. The effect of the dimensional probabilistic distribution of the nanofiller is investigated. To this purpose, an extensive experimental characterization of the morphological and physical properties of the GNPs after synthesis is performed. The proposed model is validated by comparison with the measured effective permittivity of GNP-composites with different concentrations, and it is used for the design of radar-absorbing materials in the frequency range 1-18 GHz.
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