Controlled growth-reversal of catalytic carbon nanotubes under electron-beam irradiation |
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Authors: | Stolojan Vlad Tison Yann Chen Guan Yow Silva Ravi |
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Affiliation: | Nano-Electronics Centre, Advanced Technology Institute, University of Surrey, Guildford GU2 7XH, UK. |
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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. |
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