期刊
NANO LETTERS
卷 9, 期 8, 页码 2961-2966出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl901380u
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资金
- Agence National de Recherche (Francais)
- National Science Foundation
- US Air Force Research Laboratory
We use field emission microscopy (FEM) to observe directly the growths of individual carbon nanotubes (CNTs) from the nucleation stage and discover that the CNTs often rotate axially during growth, thus supporting a recently proposed screw-dislocation-like (SDL) model. One particularly revealing case is emphasized here in which the CNT turned similar to 180 times during its 11 min growth. Even more remarkable is the frame-by-frame analysis of the video which shows that the rotation proceeds by discrete steps with about similar to 24 per rotation, half the number of atoms on the circumferences of common single wall carbon nanotubes (SWNTs). The conclusion is that we directly observed the SDL growth of a SWNT one carbon dimer at a time. This observation should aid researchers to precisely understand and control the growth of SWNTs.
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