Temperature dependence of resonant Raman scattering in double-wall carbon nanotubes

Abstract

The temperature-dependent frequency shift of resonant Raman spectra of double-wall carbon nanotubes is investigated in the range of 78–650 K. We show here that different radial breathing mode (RBM) peaks, which are relative to different tube diameters, have a different temperature coefficient of frequency shift, and the larger diameter carbon nanotubes have more RBM frequency downshift with increasing temperature. We attribute the RBM frequency variation to the temperature dependence of the stretching force constant of C–C bond.

Controlled laser heating of carbon nanotubes

“…16-18͒ and for DWCNTs. 19 Osswald et al found this rate for DWCNTs when fitting two bands at −0.026 and −0.028 cm −1 /K. 15 Chiashi et al found the same result for the G + peak of SWCNT at −0.028 cm −1 /K.…”

Raman bands of double‐wall carbon nanotubes: comparison with single‐ and triple‐wall carbon nanotubes, and influence of annealing and electron irradiation

“…49 Theory shows that elliptical deformation is energetically favourable. Flattening of the tubes is a transition observed for a large diameter range 45 and is predicted 50 to vary as 1/d 3 . For DWCNTs 15,16 several calculations have shown a small reinforcement of the tube and a transition to the elliptical shape as is observed for SWCNTs (Table 1).…”

Laser Heating Control with Polarized Light in Isolated Multiwalled Carbon Nanotubes

“…Further analysis of the G and 2D modes shows that neither their shapes nor positions are affected by the change in the φ angle for low laser power densities (LPDs). For higher LPD, mode positions begin to shift toward lower frequencies because laser light absorption induces thermal expansion of the sp 2 lattice [11][12][13][14][15][16]. However, these shifts for fixed power densities are φ dependent!…”