Coupled oscillations of double-walled carbon nanotubes

Giacomo Po, N. M. Ghoniem

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A study of the coupled axial and angular oscillations of double-walled carbon nanotubes (DWNTs) was performed using molecular dynamics simulations. In order to determine the oscillation frequencies inner and outer shells have been assumed to behave as rigid bodies, a 6-12 Lennard-Jones potential was used to model the van der Waals forces between them, and friction was neglected. Armchair (5, 5)/(10, 10) configurations, with tube lengths in the range of 25-1000 Å were investigated. The axial oscillation frequency was found to be a decreasing function of the DWNT length L (∼78 GHz for L=25 Å and ∼2 GHz for L=1000 Å). The angular oscillation frequency was found to be nearly constant at ∼58 GHz, independent of the DWNT length. In addition, sustained high-frequency angular motion can be maintained for sufficiently long DWNT (on the order of a few nanometers). For shorter DWNTs, the angular motion can be altered by interference with the axial motion, and becomes irregular.

Original languageEnglish (US)
Article number094310
JournalJournal of Applied Physics
Volume107
Issue number9
DOIs
StatePublished - May 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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