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Wideband nonlinear characteristics of random multiwalled carbon nanotubes network
Author(s) -
Oueriemi I.,
Raskin J.P.,
Choubani F.,
Huynen I.
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27842
Subject(s) - capacitive sensing , materials science , wideband , nonlinear system , microwave , carbon nanotube , capacitance , optoelectronics , equivalent circuit , schottky diode , semiconductor , electronic engineering , electrical engineering , composite material , telecommunications , engineering , physics , electrode , voltage , quantum mechanics , diode
In this work, multiwalled carbon nanotubes (MWCNTs) were randomly deposited in gaps of microstrip interdigitated capacitive (IDC) structure. Measured I‐V characteristics show nonlinear behavior of MWCNTs. Supported by an analytical Schottky‐based model, the nonlinear mechanism is attributed to semiconductor/metallic (S/M) junction properties. Measuring the IDC over a wide frequency band, from 1 kHz up to 3 GHz, we demonstrate there is a maximum frequency (∼10 MHz) beyond which the nonlinear behavior of the MWCNTs network vanishes. An equivalent lumped element circuit for MWCNTs‐based IDC describes well the measured behavior up to 3 GHz. Thanks to the extracted equivalent circuit, we demonstrate that the capacitive couplings between MWCNTs dominate over nonlinear effects above 10 MHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2648–2652, 2013