Nano Archive

Imaging active topological defects in carbon nanotubes

Suenaga, Kazu and Wakabayashi, Hideaki and Koshino, Masanori and Sato, Yuta and Urita, Koki and Iijima, Sumio (2007) Imaging active topological defects in carbon nanotubes. NATURE NANOTECHNOLOGY, 2 (6). pp. 358-360.

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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 SWNTs1-3, 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(4,5). 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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanostructured materials
ID Code:3092
Deposited By:Anuj Seth
Deposited On:13 Jan 2009 10:55
Last Modified:20 Jan 2009 14:39

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