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SWCNTs; wavelength dependent spectra; Raman spectroscopy.

The industrial use of carbon nanotubes is increasing day by day; therefore, it is very important to identify the nature of carbon nanotubes in a bundle. In this study, we have used the Raman spectroscopic analysis on vertically aligned single-walled carbon nanotubes (SWCNTs) grown by the chemical vapour deposition (CVD) technique. The grown sample is excited with two laser excitation wavelengths, 633 nm from He–Ne laser and 514.5 nm from Ar⁺ laser. Raman spectrum in the backscattering geometry provides the characteristic spectra of SWCNTs with its radial breathing mode (RBM), defect-induced disorder mode (D band), and highenergy modes (G and M bands). The Raman signal positions of the spectra in RBM, G and M bands confirm the grown sample to be of semiconducting type in nature.

S S Islam¹ Khurshed Ahmad Shah¹ H S Mavi² A K Shaukla² S Rath³ Harsh⁴

1. Department of Applied Sciences and Humanities, Faculty of Engineering and Technology, Jamia Millia Islamia (Central University), New Delhi 110 025, India
2. Department of Physics, Indian Institute of Technology, New Delhi 110 016, India
3. Department of Physics and Astrophysics, Delhi University, Delhi 110 007, India
4. Solid State Physics Laboratory, New Delhi 110 054, India

Published

June 2007

Manuscript received

4 December 2006

Manuscript revised

4 April 2007