Influence of structural and dielectric anisotropy on the dielectrophoresis of single-walled carbon nanotubes.
Nano Lett
; 7(7): 1960-6, 2007 Jul.
Article
em En
| MEDLINE
| ID: mdl-17579469
ABSTRACT
We report on a carbon nanotube network which is composed of aligned metallic and randomly oriented semiconducting single-walled carbon nanotubes. The material is formed by using a novel radio frequency dielectrophoresis setup, which generates very large dielectrophoretic force fields and allows dielectrophoretic assembling of nanotube films up to 100 nm thickness. Polarization dependent absorption measurements provide experimental evidence for the electronic type specific alignment behavior. We explain the experimental data with an advanced model for nanotube dielectrophoresis, which explicitly takes into account both the longitudinal and transversal polarizability. On the basis of this model, we calculate the dielectrophoretic force fields and show that semiconducting nanotubes deposit under very large fields due to their transversal polarizability even for high field frequencies.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nanotubos de Carbono
/
Eletrônica
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Alemanha