Buckling Behaviors of Double-Walled Carbon Nanotubes with Abnormal Interlayer Distances

摘要

Several double-walled carbon nanotubes (DWCNTs) composed of internal and external single-walled carbon nanotubes (SWCNTs) with different radii and chirality are presented and simulated by the molecular dynamics (MD) method. Both armchair-armchair and zigzag-zigzag patterns are included. Interlayer distances of the novel DWCNTs are different with 0.34nm of the normal DWCNTs. Their buckling behaviors and changes of strain energy under uniaxial compression are simulated to examine the influence of the van der Waals force on the mechanical properties of DWCNTs. Numerical results show that the different van der Waals force coming from different interlayer spacing results in different critical buckling strain. It is found that the buckling behaviors of armchair-armchair DWCNTs are similar with but not completely the same as those of zigzag-zigzag DWCNTs. The novel DWCNTs whose interlayer spacings are less than 0.34nm exhibit better compressive stability as compared with the normal DWCNT.