A bundle of single wall carbon nanotubes (SWCNTs) with circular cross-section is treated as a homogeneous material with a.c. effective conductivity σ( ω), which is evaluated by using the Drude's complex expression. The effective d.c. conductivity of the homogeneous bundle is obtained from the total d.c. resistance. The frequency-domain distribution of current density along radial direction of the bundle is utilized to obtain the expressions of the skin depth and the effective impedance. Applications of the proposed formulation to SWCNT bundles of different configurations are carried out. The obtained results show the saturation behaviour of the effective resistance and inductance above a critical frequency, which depends on the momentum relaxation time of the CNTs. ©2010 IEEE.
Skin-effect modelling of carbon nanotube bundles: the high-frequency effective impedance / D'Amore, Marcello; Sarto, Maria Sabrina; D'Aloia, ALESSANDRO GIUSEPPE. - STAMPA. - (2010), pp. 847-852. (Intervento presentato al convegno 2010 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY tenutosi a FORT LAUDERDALE, FL, USA nel JULY 25-31, 2010) [10.1109/ISEMC.2010.5711390].
Skin-effect modelling of carbon nanotube bundles: the high-frequency effective impedance
D'AMORE, Marcello;SARTO, Maria Sabrina;D'ALOIA, ALESSANDRO GIUSEPPE
2010
Abstract
A bundle of single wall carbon nanotubes (SWCNTs) with circular cross-section is treated as a homogeneous material with a.c. effective conductivity σ( ω), which is evaluated by using the Drude's complex expression. The effective d.c. conductivity of the homogeneous bundle is obtained from the total d.c. resistance. The frequency-domain distribution of current density along radial direction of the bundle is utilized to obtain the expressions of the skin depth and the effective impedance. Applications of the proposed formulation to SWCNT bundles of different configurations are carried out. The obtained results show the saturation behaviour of the effective resistance and inductance above a critical frequency, which depends on the momentum relaxation time of the CNTs. ©2010 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.