Abstract
We performed high pressure resonant Raman experiments on well characterized purified single-wall carbon nanotubes up to using argon as pressure transmitting medium. We used two different excitating wavelengths, at and . In contrast with other studies no clear sign of phase transformation is observed up to the highest studied pressure of . Our results suggest that the progressive disappearance of the radial breathing modes observed while increasing pressure should not be interpreted as the sign of a structural phase transition. Moreover, a progressive change of profile of the tangential modes is observed. For pressures higher than the profile of those modes is the same for both laser excitations. We conclude that a progressive loss of resonance of single-wall carbon nanotubes under pressure might occur. In addition, after high pressure cycle we observed a decrease of intensity of the radial breathing and tangential modes and a strong increase of the band.
- Received 17 March 2005
DOI:https://doi.org/10.1103/PhysRevB.72.035409
©2005 American Physical Society