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Short-length carbon nanotubes as building blocks for high dielectric constant materials in the terahertz range

Shuba, Mikhail and Paddubskaya, Alesia and Kuzhir, Polina and Maksimenko, Sergey and Flahaut, Emmanuel and Fierro, Vanessa and Celzard, Alain and Valušis, Gintaras Short-length carbon nanotubes as building blocks for high dielectric constant materials in the terahertz range. (2017) Journal of Physics D: Applied Physics, 50 (8). 08LT01. ISSN 0022-3727

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Official URL: http://dx.doi.org/10.1088/1361-6463/aa5628

Abstract

Due to the high polarizability of finite-length carbon nanotubes (CNTs) in the quasi-static regime, they can be considered as building blocks for the fabrication of high dielectric constant material. Our theoretical estimations, based on an effective medium approach and solutions of a boundary value problem for individual CNT, predict that composite materials comprising short-length CNTs can have very high dielectric constants (up to 300) and low dielectric loss tangents (below 0.03) in the terahertz range. In order to prove this, 500–1000 nm thick films comprising single- and multi-walled CNTs of both long (0.5–2 μm) and short (0.1–0.4 μm) lengths have been fabricated. The analysis, based on the time-domain terahertz spectroscopy in the range 0.2–1.0 THz, demonstrated a decrease in the dielectric loss tangents of the CNT-based materials with a reduction in CNT length. In the terahertz range, the films comprising short-length CNTs had a relative effective permittivity with a large real part (25–136) and dielectric loss tangent (0.35–0.60).

Item Type:Article
Additional Information:Thanks to Institute of Physics editor. The definitive version is available at http://iopscience.iop.org/ The original PDF of the article can be found at http://iopscience.iop.org/article/10.1088/1361-6463/aa5628/meta
HAL Id:hal-01538379
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Belarusian State University (Minsk, BELARUS)
Other partners > Center for Physical Sciences and Technology - FTMC (LITHUANIA)
Other partners > Tomsk State University - TSU (RUSSIA)
Other partners > Vilniaus Universitetas (LITHUANIA)
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Deposited By: cirimat webmestre
Deposited On:13 Jun 2017 12:38

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