Pristine single-wall carbon nanotubes (SWCNT's) filled with C-60 are investigated with resonance Raman spectroscopy. Both totally symmetric modes of C-60 exhibit a surprising splitting into two components with a slightly different resonance behavior and an apparent loss of polarization. The latter can be understood from a symmetry reduction of the fullerene molecules in the center of the tubes and/or by an anisotropy of the electric field seen by the C-60 peas inside the SWCNT pods due to depolarization effects. The splitting is explained from molecular-dynamics simulations which show that the two bands emerge from a coupling of the C-60 totally symmetric modes to the fullerene translational mobility inside the tube. The doublet is thus the spectroscopic fingerprint of different mobilities of C-60 fullerenes in the tubes.
Titolo: | Electronic and mechanical coupling between guest and host in carbon peapods |
Autore/i: | Pfeiffer R; Kuzmany H; Pichler T; Kataura H; Achiba Y; Melle Franco M; ZERBETTO, FRANCESCO |
Autore/i Unibo: | |
Anno: | 2004 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevB.69.035404 |
Abstract: | Pristine single-wall carbon nanotubes (SWCNT's) filled with C-60 are investigated with resonance Raman spectroscopy. Both totally symmetric modes of C-60 exhibit a surprising splitting into two components with a slightly different resonance behavior and an apparent loss of polarization. The latter can be understood from a symmetry reduction of the fullerene molecules in the center of the tubes and/or by an anisotropy of the electric field seen by the C-60 peas inside the SWCNT pods due to depolarization effects. The splitting is explained from molecular-dynamics simulations which show that the two bands emerge from a coupling of the C-60 totally symmetric modes to the fullerene translational mobility inside the tube. The doublet is thus the spectroscopic fingerprint of different mobilities of C-60 fullerenes in the tubes. |
Data prodotto definitivo in UGOV: | 2005-10-07 |
Appare nelle tipologie: | 1.01 Articolo in rivista |