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Infrared microreflectance study of the pressure effect on the structural properties of magnetically aligned single‐wall carbon nanotubes
Author(s) -
Kuntscher C. A.,
Thirunavukkuarasu K.,
Kamarás K.,
Simon F.,
Walters D. A.
Publication year - 2008
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.200879575
Subject(s) - carbon nanotube , infrared , anisotropy , anomaly (physics) , materials science , phase transition , reflectivity , condensed matter physics , nanotechnology , optics , physics
The optical response of magnetically aligned singlewall carbon nanotube films was studied by polarizationdependent reflectance measurements in the infrared and visible frequency range as a function of external pressure. At ambient pressure the optical properties are anisotropic and show the characteristic excitations (broad infrared peak and optical transitions). The pressure‐induced shift of the optical transitions reveals an anomaly at a critical pressure P c ≈2.7 GPa. This anomaly can be attributed to the circular‐to‐oval structural phase transition in the nanotubes. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)