Substitutional doping of carbon nanotubes to control their electromagnetic characteristics

A. M. Nemilentsau, M. V. Shuba, G. Ya Slepyan, P. P. Kuzhir, S. A. Maksimenko, P. N. D'Yachkov, A. Lakhtakia

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Abstract

Substitutional doping of bundles and composite materials, containing a mixture of semiconducting and metallic single-wall carbon nanotubes (SWNTs), by either nitrogen or boron atoms substantially alters their electromagnetic characteristics in the terahertz and the far-infrared regimes. Metallization of semiconducting SWNTs caused by doping exclusively by either boron or nitrogen increases the axial polarizability, the antenna efficiency, and the intensity enhancement factor of SWNT bundles; likewise, the conductivity of SWNT-based composite materials is enhanced by substitutional doping. The frequencies of the antenna resonances in the axial-polarizability spectra of the doped bundles are blueshifted in comparison with the resonance frequencies in the undoped ones. The doping-caused enhancement of the effective conductivity of SWNT-based composite materials in the far-infrared regime may occur not only due to the enhancement of conductivities of single SWNTs but also due to the decrease in the depolarizing field.

Original languageEnglish (US)
Article number235424
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number23
DOIs
StatePublished - Dec 14 2010

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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