X-ray irradiation effect of double walled carbon nanotube*
Department of Material Science, Wakayama University,
2 Department of Physics, Wakayama University, 640-8510 Wakayama, Japan
Received: 13 July 2012
Received in final form: 29 December 2012
Published online: 24 April 2013
We have studied double-walled carbon nanotube (DWNT) irradiated by soft X-ray by Raman scattering spectroscopy and the spectral characteristics are compared to single-walled carbon nanotube (SWNT) irradiated under the same condition. We proved that DWNT is more stable for the X-ray induced defect formation than SWNT. Moreover, we found that the outer tube of DWNT was more sensitive on X-ray irradiation than the inner tube. The defect was recovered by annealing in Ar at lower temperature than that of SWNT. Based on these results, we inferred that X-ray irradiation leads to formation of interstitial-vacancy pairs, Frenkel defects, in carbon nanotube. The interstitial-vacancy separation on the inner tube of DWNT is conceivably shorter than that of the outer tube.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013