Effects of ion beam heating on Raman spectra of single-walled carbon nanotubes

Hulman, Martin; Skákalová, Viera; Krasheninnikov, A. V.; Roth, S.
February 2009
Applied Physics Letters;2/16/2009, Vol. 94 Issue 7, pN.PAG
Academic Journal
Free standing films of single-wall carbon nanotubes were irradiated with energetic N+ and C4+ ions. The observed changes in the Raman line shape of the radial breathing mode and the G band of the C4+ irradiated samples were similar to those found for a thermally annealed sample. We ascribe these changes to thermal desorption of volatile dopants from the initially doped nanotubes. A simple geometry of the experiment allows us to estimate the temperature rise by one-dimensional heat conductance equation. The calculation indicates that irradiation-mediated increase in temperature may account for the observed Raman spectra changes.


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