Near-static dielectric polarization of individual carbon nanotubes.
Low-frequency dielectric responses of carbon nanotubes are important for their manipulation, separation, and electronic applications. Here we report the first experimental measurement of near-dc polarization of individual carbon nanotubes by using modified scanning force microscopy techniques. The transverse polarizability of carbon nanotubes is equivalent to solid cylindrical media with a dielectric constant of about 10, irrespective of tube diameter and chirality. The longitudinal polarization is also observed and used to distinguish metallic from semiconducting nanotubes.
Lu
Wei
W
Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, USA.
Wang
Dan
D
Chen
Liwei
L
D016880:Anisotropy; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
D046911:Macromolecular Substances