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.
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Official URL: http://www.nature.com/nnano/journal/v2/n6/abs/nnan...
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.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanostructured materials
|Deposited By:||Anuj Seth|
|Deposited On:||13 Jan 2009 10:55|
|Last Modified:||20 Jan 2009 14:39|
Repository Staff Only: item control page