Effects of vacancies on interwall spacings of multi-walled carbon nanotubes |
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| Authors: | Ming-du Ma Jefferson Zhe Liu Li-feng Wang Lu-ming Shen and Quan-shui Zheng |
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| Institution: | (1) Department of Physics, National Technical University of Athens, GR-15780 Athens, Greece;(2) Department of Physics and Astronomy, Vanderbilt University, 37235 Nashville, TN, USA;(3) Department of Electrical Engineering and Computer Science, Vanderbilt University, 37235 Nashville, TN, USA;(4) Oak Ridge National Laboratory, 37831 Oak Ridge, TN, USA |
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| Abstract: | 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. |
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| Keywords: | Multi-walled carbon nanotubes （MWCNTs） Noise carbon nanotubes Electron beam irradiation Defects |
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