Effect of purification of the electrical conductivity and complex permittivity of multiwall carbon nanotubes

Citation
Ca. Grimes et al., Effect of purification of the electrical conductivity and complex permittivity of multiwall carbon nanotubes, J APPL PHYS, 90(8), 2001, pp. 4134-4137
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
0021-8979 → ACNP
Volume
90
Issue
8
Year of publication
2001
Pages
4134 - 4137
Database
ISI
SICI code
0021-8979(20011015)90:8<4134:EOPOTE>2.0.ZU;2-Q
Abstract
In this work we report on the complex permittivity spectra and electrical c onductivity of both as-fabricated and graphitized multiwall carbon nanotube s (MWNTs). The high-temperature annealing removes the Fe3C catalyst particl es present in the as-fabricated material, enabling the intrinsic MWNT prope rties to be measured. The permittivity spectra of 1 wt % MWNT-polystyrene c omposite films are measured from 75 to 1875 MHz. Comparison of measurements with an appropriate effective medium model shows that the residual catalys t inclusions in the core of the nanotube increase the average electrical co nductivity by approximately a factor of 3.5. (C) 2001 American Institute of Physics.