Effects of vacancies on interwall spacings of multi-walled carbon nanotubes  

作　　者：Ming-du MA Jefferson Zhe LIU Li-feng WANG Lu-ming SHEN Quan-shui ZHENG 

机构地区：[1]Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China [2]Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3168, Australia [3]Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [4]School of Civil Engineering, University of Sydney, NSW 2006, Australia

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2010年第10期714-721,共8页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Basic Research Program (973) of China (No 2007CB936803);the National High-Tech R&D Program (863) of China (No 2008AA03Z302);the National Natural Science Foundation of China (No 10832005);the Joint Research Scheme of the National Natural Science Foundation of China and Research Grants Council of Hong Kong (No 50518003)

摘　　要：We use molecular dynamics (MD) simulations to study the effects of vacancies on tube diameters and interwall spacings of multi-walled carbon nanotubes (MWCNTs). Two types of vacancies, double vacancy and three dangling-bond (3DB) single vacancy, are identified to have opposite effects on the tube size change, which explains the inconsistency of the experimentally measured interwall spacings of MWCNTs after electron beam irradiation. A theoretical model to quantitatively predict the shrunk structures of the irradiated MWCNTs is further developed. We also discuss the fabrications of prestressed MWCNTs, in which reduced interwall spacings are desired to enhance the overall elastic modulus and strength.We use molecular dynamics （MD） simulations to study the effects of vacancies on tube diameters and interwall spacings of multi-walled carbon nanotubes （MWCNTs）. Two types of vacancies, double vacancy and three dangling-bond （3DB） single vacancy, are identified to have opposite effects on the tube size change, which explains the inconsistency of the experimentally measured interwall spacings of MWCNTs after electron beam irradiation. A theoretical model to quantitatively predict the shrunk structures of the irradiated MWCNTs is further developed. We also discuss the fabrications of prestressed MWCNTs, in which reduced interwall spacings are desired to enhance the overall elastic modulus and strength.

关 键 词：Multi-walled carbon nanotubes （MWCNTs） Noise carbon nanotubes Electron beam irradiation DEFECTS 

分 类 号：TU113.3[建筑科学—建筑理论] TB383[一般工业技术—材料科学与工程]