Open AccessNon resonant Raman spectra of homogeneous and inhomogeneous individual dimers of Single-walled Carbon Nanotubes (SWNTs)
Author(s) -
Mourad Boutahir,
Sidi Abdelmajid Ait Abdelkader,
B. Fakrach,
A. Rahmani,
H. Chadli,
A. Rahmani
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/783/1/012016
Subject(s) - carbon nanotube , raman spectroscopy , materials science , dimer , molecular physics , van der waals force , phonon , spectral line , homogeneous , coupling (piping) , chemical physics , condensed matter physics , nanotechnology , molecule , chemistry , nuclear magnetic resonance , optics , physics , composite material , thermodynamics , organic chemistry , astronomy
We study the effects of the coupling between single-walled carbon nanotubes (SWNTs) on the phonons in homogeneous (identical nanotubes) and inhomogeneous (different nanotubes) dimers of SWNTs. Bond polarization theory and the spectral moments method (SMM) are used to calculate the non-resonant Raman frequencies of the breathing-like modes (BLMs) and tangential-like ones (TLMs). The dependence of the phonons on different structural parameters such as diameter and chirality is investigated. We focus on the dependence of the so-called Breathing-Like Modes (BLMs) of dimers originating from the van der Waals coupling of the Radial Breathing Modes (RBMs) of each individual tube forming the dimer. On the other hand, the TLM of dimer is reported and discussed. Distinct behaviors of the TLM are evidenced. The calculated of spectra are compared with the few experimental Raman data obtained on individual dimers.