Vibration characteristics of single- and double-walled carbon nanotubes functionalized with amide and amine groups

Carbon nanotube functionalization for designing devices with atomic precision has been of great importance in recent years. This article studies the vibration behavior of single-walled carbon nanotubes (SWCNTs) and double-walled carbon nanotubes (DWCNTs) functionalized with amine and amide groups employing molecular dynamics (MD) simulations. The results demonstrate that the natural frequency of CNTs reduces considerably through attaching functional groups to them. Also, it is demonstrated that the natural frequency of DWCNTs is less sensitive to functional groups in comparison with their constituent inner and outer functionalized tubes. Further, it is indicated that the functionalization performed has its most pronounced effect on SWCNTs with small aspect ratios. (C) 2015 Elsevier B.V. All rights reserved.