skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures

Abstract

The Raman spectra of single-walled carbon nanotubes at temperatures up to 730 K and pressures up to 7 GPa have been measured. The behavior of phonon modes and the interaction between nanotubes in bundles have been studied. It has been found that the temperature shift of the vibrational G mode is completely reversible, whereas the temperature shift of radial breathing modes is partially irreversible and the softening of the modes and narrowing of phonon bands are observed. The temperature shift and softening of radial breathing modes are also observed when samples are irradiated by laser radiation with a power density of 6.5 kW/mm{sup 2}. The dependence of the relative frequency {Omega}/{Omega}{sub 0} for G{sup +} and G{sup -} phonon modes on the relative change A{sub 0}/A in the triangular lattice constant of bundles of nanotubes calculated using the thermal expansion coefficient and compressibility coefficient of nanotube bundles shows that the temperature shift of the G mode is determined by the softening of the C-C bond in nanotubes. An increase in the equilibrium distances between nanotubes at the breaking of random covalent C-C bonds between nanotubes in bundles of nanotubes is in my opinion the main reason for the softening ofmore » the radial breathing modes.« less

Authors:
 [1]
  1. Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22069232
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 6; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON; CHEMICAL BONDS; COMPRESSIBILITY; COVALENCE; EQUILIBRIUM; LASER RADIATION; LATTICE PARAMETERS; NANOTUBES; PHONONS; POWER DENSITY; PRESSURE DEPENDENCE; RAMAN SPECTRA; RANDOMNESS; TEMPERATURE DEPENDENCE; THERMAL EXPANSION

Citation Formats

Meletov, K. P., E-mail: mele@issp.ac.ru. Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures. United States: N. p., 2012. Web. doi:10.1134/S1063776112130079.
Meletov, K. P., E-mail: mele@issp.ac.ru. Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures. United States. doi:10.1134/S1063776112130079.
Meletov, K. P., E-mail: mele@issp.ac.ru. Sat . "Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures". United States. doi:10.1134/S1063776112130079.
@article{osti_22069232,
title = {Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures},
author = {Meletov, K. P., E-mail: mele@issp.ac.ru},
abstractNote = {The Raman spectra of single-walled carbon nanotubes at temperatures up to 730 K and pressures up to 7 GPa have been measured. The behavior of phonon modes and the interaction between nanotubes in bundles have been studied. It has been found that the temperature shift of the vibrational G mode is completely reversible, whereas the temperature shift of radial breathing modes is partially irreversible and the softening of the modes and narrowing of phonon bands are observed. The temperature shift and softening of radial breathing modes are also observed when samples are irradiated by laser radiation with a power density of 6.5 kW/mm{sup 2}. The dependence of the relative frequency {Omega}/{Omega}{sub 0} for G{sup +} and G{sup -} phonon modes on the relative change A{sub 0}/A in the triangular lattice constant of bundles of nanotubes calculated using the thermal expansion coefficient and compressibility coefficient of nanotube bundles shows that the temperature shift of the G mode is determined by the softening of the C-C bond in nanotubes. An increase in the equilibrium distances between nanotubes at the breaking of random covalent C-C bonds between nanotubes in bundles of nanotubes is in my opinion the main reason for the softening of the radial breathing modes.},
doi = {10.1134/S1063776112130079},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 6,
volume = 115,
place = {United States},
year = {2012},
month = {12}
}