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Pressure‐induced phenomena in single‐walled carbon nanotubes: Structural phase transitions and the role of pressure transmitting medium
Author(s) -
Kuntscher C. A.,
Abouelsayed A.,
Thirunavukkuarasu K.,
Hennrich F.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000150
Subject(s) - carbon nanotube , materials science , phase transition , anomaly (physics) , redshift , absorption (acoustics) , phase (matter) , molecular physics , condensed matter physics , optics , nanotechnology , chemistry , composite material , physics , astrophysics , organic chemistry , galaxy
We studied the effect of pressure on the electronic properties of bundled single‐walled carbon nanotubes by infrared transmission measurements. Different pressure transmitting media were employed to verify their influence on the observed pressure dependence. A redshift of the optical absorption bands is observed under pressure. Irrespective of the pressure transmitting medium, the pressure‐induced frequency shifts of the optical transitions show an anomaly at a critical pressure p c = 2–3 GPa, which can be attributed to the predicted circular‐to‐elliptical structural phase transition. We find a second anomaly in the frequency shifts of the optical transitions at 5–6 GPa, which we interpret in terms of the change of the nanotubes' cross‐section from elliptical to race‐track or peanut type, in agreement with earlier reports.