Abstract
Raman spectra of purified arc-discharge single-walled carbon nanotubes (SWCNTs) were measured at temperatures up to 750 K. The temperature-induced frequency shift is reversible for the tangential G modes and irreversible for the radial breathing modes (RBMs). The residual softening of the RBMs increases with the tube diameter, whereas its dependence on the treatment temperature exhibits a threshold-like character. The mode softening can be attributed to removal of adsorbents and/or destruction of random C–C bonds between adjacent nanotubes caused by the high temperature treatment (HTT).
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