Phys. Rev. B 75, 121405(R) (2007) [4 pages]High-temperature evolution of linear carbon chains inside multiwalled nanotubes
Multiwalled carbon nanotubes have been deposited on graphite cathodes by the arc discharge technique in a He atmosphere. A micro-Raman mapping, performed after scanning electron microscopy, reveals, in some regions of the sample, strong bands in the 1780–1860 cm−1 range due to linear carbon chains inside the nanotubes. A temperature-dependent Raman study, up to about 1000 K, shows a strong but reversible decrease in their intensity. This phase transition behavior is explained as a temperature-driven reduction of the Peierls distortion of the linear carbon chain. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.121405
DOI:
10.1103/PhysRevB.75.121405
PACS:
81.07.De, 63.22.+m, 68.37.Hk
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