Temperature Coefficients of Raman Frequency of Individual Single-Walled Carbon Nanotubes

Abstract

High Resolution Image Download MS PowerPoint Slide In the present study, individual suspended single-walled carbon nanotubes (SWNTs) were prepared and the temperature coefficients of Raman frequency of 13 SWNTs were measured. It is found that the temperature coefficients of the G-band frequency (α ω G ) are similar, around (−1.67 ± 0.20)×10 -5 /K, whereas in the case of the radial breathing mode (RBM), the coefficients (α ω RBM ) are varied from a minimum value of −1.06 × 10 -6 /K to a maximum of −2.30 × 10 -4 /K. Larger-diameter nanotubes tend to have larger α ω RBM values; moreover, nanotubes with similar diameters may show different α ω RBM values. These results reveal that the α ω RBM value of individual SWNTs depends on both diameter and chirality.