Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 84: Poster: Electronic structure theory / Carbon (other than graphene) / Si, Ge, and SiC / III-V semiconductors (other than nitrides)
HL 84.7: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
study of electrical and mechanical properties of single walled carbon nanotubes — •Maryam Youhannayee1, Mathias Getzlaff1, and Hossein Golnabi2 — 1Heinrich Heine Universität Düsseldorf — 2Sharif university of technology
In this research, using the single-band tight-binding approach and the energy dispersion relation, variation of band gap energy due to the effect of uniaxial stress on the zigzag and armchair single wall carbon nanotubes has been investigated analytically. The obtained results show that in all the zigzag carbon nanotubes, the band gap behaves linearly with increasing the uniaxial stress and one can observe a transition from semiconducting to metallic. In case of zigzag nanotubes with small diameter we have critical point which in that point critical break happens. The armchair carbon nanotubes are disable in response to the uniaxial stress and their metallic behavior is retained.
This research also investigates the electromechanical coupling in single-walled carbon nanotubes. In the model system, the extra electric charge of nanotubes is assumed to be uniformly distributed between carbon atoms. The electrostatic interactions between charged carbon atoms are calculated using the Coulomb law. It is shown that the classical electrostatics is computationally efficient. I studied a simplified electron- lattice model at low charge injection levels and showed that the electromechanical actuation of SWNTs strongly depends on (N, M). N and M are the chiral index that shows different kind of nano tubes. The effects of charge injection (electron and hole), tube diameter on longitudinal, radial and torsional angle change have been examined.