Phonon frequency distribution function and temperature variation of Rayleigh Mössbauer scattering fraction from aligned multiwalled carbon nanotubes

Abstract

The phonon frequency distribution function (FDF) of aligned multiwalled carbon nanotubes (MWNTs) was obtained by unfolding its observed temperature variation of specific heat in the temperature range 1.8 to 250 K. An anisotropic dynamical model which incorporates the presence of two-dimensional modes on the surface of the tube and the intertube coupling was used as a trial function to carry out the unfolding process numerically. Temperature variation of Rayleigh Mössbauer scattering fraction of Sn-119 gamma-photons was computed using the trial and final FDF of MWNT. The temperature variation of Rayleigh Mössbauer scattering fraction in each case is quite marked and can be observed experimentally.