Document Detail


Imaging active topological defects in carbon nanotubes.
MedLine Citation:
PMID:  18654307     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A single-walled carbon nanotube (SWNT) is a wrapped single graphene layer, and its plastic deformation should require active topological defects--non-hexagonal carbon rings that can migrate along the nanotube wall. Although in situ transmission electron microscopy (TEM) has been used to examine the deformation of SWNTs, these studies deal only with diameter changes and no atomistic mechanism has been elucidated experimentally. Theory predicts that some topological defects can form through the Stone-Wales transformation in SWNTs under tension at 2,000 K, and could act as a dislocation core. We demonstrate here, by means of high-resolution (HR)-TEM with atomic sensitivity, the first direct imaging of pentagon-heptagon pair defects found in an SWNT that was heated at 2,273 K. Moreover, our in situ HR-TEM observation reveals an accumulation of topological defects near the kink of a deformed nanotube. This result suggests that dislocation motions or active topological defects are indeed responsible for the plastic deformation of SWNTs.
Authors:
Kazu Suenaga; Hideaki Wakabayashi; Masanori Koshino; Yuta Sato; Koki Urita; Sumio Iijima
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Publication Detail:
Type:  Letter; Research Support, Non-U.S. Gov't     Date:  2007-05-13
Journal Detail:
Title:  Nature nanotechnology     Volume:  2     ISSN:  1748-3395     ISO Abbreviation:  -     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2008-07-25     Completed Date:  2008-09-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101283273     Medline TA:  Nat Nanotechnol     Country:  England    
Other Details:
Languages:  eng     Pagination:  358-60     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Hot Temperature
Image Enhancement / methods*
Macromolecular Substances / chemistry
Materials Testing / methods*
Microscopy, Electron, Transmission / methods*
Molecular Conformation
Nanotechnology / methods*
Nanotubes, Carbon / chemistry*,  ultrastructure*
Particle Size
Surface Properties
Chemical
Reg. No./Substance:
0/Macromolecular Substances; 0/Nanotubes, Carbon

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