title: Raman-active modes in homogeneous and inhomogeneous bundles of single-walled carbon nanotubes.
abstract: In the present work, the non-resonant Raman-active modes are calculated for several diameters, chiralities and sizes for homogeneous and inhomogeneous bundles of single-walled carbon nanotubes (BWCNTs), using the spectral moment's method (SMM). Additional intense Raman-active modes are present in the breathing-like modes (BLM) spectra of these systems in comparison with a single fully symmetric A(1g) mode characteristic of isolated nanotubes (SWCNTs). The dependence of the wavenumber of these modes in terms of diameters, lengths and number of tubes was investigated. We found that, for a finite (in)homogeneous bundle, additional breathing-like modes appear as a specific signature.
authors.affiliation: Laboratoire de Physique des matériaux et Modélisation des Systèmes, Université Moulay Ismaïl, Faculté des Sciences, BP 11201, Zitoune, 50000 Meknès, Morocco.
authors.forename: K
authors.initials: K
authors.lastname: Sbai
authors.forename: A
authors.initials: A
authors.lastname: Rahmani
authors.forename: H
authors.initials: H
authors.lastname: Chadli
authors.forename: J-L
authors.initials: JL
authors.lastname: Sauvajol