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High‐pressure optical study of small‐diameter chirality‐enriched single‐wall carbon nanotubes
Author(s) -
Krottenmüller M.,
Gao W.,
Anis B.,
Kono J.,
Kuntscher C. A.
Publication year - 2016
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.201600358
Subject(s) - carbon nanotube , chirality (physics) , materials science , absorption (acoustics) , phase transition , phase (matter) , nanotube , absorption spectroscopy , absorption band , nanotechnology , molecular physics , composite material , chemical physics , optics , chemistry , condensed matter physics , organic chemistry , chiral symmetry breaking , physics , quantum mechanics , nambu–jona lasinio model , quark
Abstract We have investigated the mechanical stability of small‐diameter single‐wall carbon nanotube (SWCNT) films via optical absorption spectroscopy under high pressure. The studied sample was enriched in (6,5) SWCNTs, in order to observe sharp optical transitions even at high pressures. We observed two well‐defined absorption bands in the studied frequency range, both of which red‐shifted with increasing pressure. The rate of the pressure‐induced red shift of one absorption band was found to change dramatically at 8 GPa, which we interpret as a structural phase transition of the nanotubes’ cross‐section from circular to oval. By comparing the data with that for a film of mixed‐chirality SWCNTs with an average diameter of 1.4 nm, we conclude that smaller‐diameter SWCNTs have higher mechanical stability, which is consistent with theoretical expectations. No collapse of (6,5) SWCNTs was observed up to 22 GPa.