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

• Published in: Journal of physical chemistry. C Vol. 111; no. 38; pp. 14031 - 14034
• Main Authors: Zhang, Yingying, Xie, Liming, Zhang, Jin, Wu, Zhongyun, Liu, Zhongfan
• Format: Journal Article
• Language: English
• Published: American Chemical Society 27.09.2007
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp075058f

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 (αω G) are similar, around (−1.67 ± 0.20)×10-5/K, whereas in the case of the radial breathing mode (RBM), the coefficients (αω 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 αω RBM values; moreover, nanotubes with similar diameters may show different αω RBM values. These results reveal that the αω RBM value of individual SWNTs depends on both diameter and chirality.