AI Article Synopsis
- The study focuses on the growth dynamics of single-wall carbon nanotubes (SWCNTs) using nickelocene as a precursor within template SWCNTs.
- Multi-laser Raman spectroscopy was used to analyze the growth of nine different SWCNT types at varying temperatures, revealing two distinct reaction pathways: fast and slow growth.
- The research found that while the activation energy for slow growth remains constant across different nanotubes, fast growth's activation energy increases as the tube diameter decreases, highlighting the importance of catalyst size in the growth process.
Article Abstract
Growth dynamics of single-wall carbon nanotubes (SWCNTs) have been studied with nickelocene as a precursor encapsulated in the interior of template SWCNTs. By means of multi-laser Raman spectroscopy, growth curves of nine different SWCNTs, (8,8), (12,3), (13,1), (9,6), (10,4), (11,2), (11,1), (9,3) and (9,2), have been determined upon in situ annealing at various temperatures. The data reveal that the nanotubes grow through fast and slow reaction pathways with high and low activation energies, respectively. While the activation energy of the slow growth is independent of the nanotube's chiral vector, that of the fast growth exhibits a monotonic increase as the tube diameter reduces from ∼1.1 down to 0.8 nm and no dependency on the chiral angle, which can be attributed to the size-dependent properties of catalyst clusters. The chirality dependent catalytic growth properties exploited in this study provide the basis for a large-scale synthesis of single-chiral vector SWCNTs.
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| http://dx.doi.org/10.1039/c7nr01846k | DOI Listing |
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