Abstract
Due to the high conductivity and aspect ratio of multiwall carbon nanotubes (MWCNTs) they are widely utilized as inclusions for the design of conductive composite materials with a low percolation threshold [1]. At present, the strong shielding effect of MWCNT-based composites has been demonstrated in the gigahertz range [1-2]. Much attention has been paid to the concentration dependence of the shielding effect [2]. The influence of the MWCNT length and annealing of MWCNTs on the effect has also been reported [1]. Theoretical analysis of MWCNT electromagnetic response presented in Ref. [3] does not take into account the finite-length effect in MWCNTs, while our recent reports [4-5] demonstrate strong influence of the nanotube length on its polarizability, at least for thin MWCNTs with diameters less than 10 nm. In the present paper we consider the electromagnetic response of thick MWCNTs (100 nm > D > 10 nm) in the gigahertz range taking into account finite-size effects.
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