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 $1780--1860\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ range due to linear carbon chains inside the nanotubes. A temperature-dependent Raman study, up to about $1000\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, 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.

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