Controlled growth-reversal of catalytic carbon nanotubes under electron-beam irradiation.
basic_science · Level V
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Abstract
The growth of carbon nanotubes from Ni catalysts is reversed and observed in real time in a transmission electron microscope, at room temperature. The Ni catalyst is found to be Ni3C and remains attached to the nanotube throughout the irradiation sequence, indicating that C most likely diffuses on the surface of the catalyst to form nanotubes. We calculate the energy barrier for saturating the Ni3C (2-13) surface with C to be 0.14 eV, thus providing a low-energy surface for the formation of graphene planes.
Medical subject headings
- Crystallization
- Electrons
- Models, Chemical
- Models, Molecular
- Nanotechnology
- Nanotubes, Carbon