The Effects of Different Defects on Vibration Properties of Single-walled Carbon Nanotubes
- 物理技术－会议论文 
Based on the continuum mechanics method, three-dimensional finite element (FE) models are used to study the effects of different defects on the vibration of armchair and zigzag single-walled carbon nanotubes (SWCNTs). The variations of the vibration mode and the 1st natural frequency with diameter and aspect (length-to-diameter) ratio are investigated. The diameter of SWCNTs varies from 1.0 to 2.1 nm and the aspect ratio varies from 3 to 32. Double-atom vacancy defects and Stone-Wales (SW) defects are considered. The computational results show that the length, the diameter and the defect position of SWCNTs are three important factors affecting the vibration properties of SWCNTs. For both armchair and zigzag SWCNTs, the SW defects have less effect on the vibration properties than the double-atom vacancy defects. The defects studied in this paper decrease the 1st natural frequency by a largest proportion of within 10%. It is also worth noting that for double-atom vacancy defect, the distance between the defect and the restrained end definitely affects the 1st natural frequencies of SWCNTs when the distance varies from 0.3 to 4.8 nm. While for SW defect, it is not the truth. In addition, there exists a position where the distance between the defect position and the restrained end has no effect on the 1st natural frequencies of SWCNTs.