Metallic/semiconducting ratio of carbon nanotubes in a bundle prepared using CVD technique

Pramana

A K Shukla¹  S S Islam²  Khurshed Ahmad Shah1²  H S Mavi¹  Harsh³ 

[1] Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi 110 016, India$$;Department of Applied Sciences and Humanities, Faculty of Engineering and Technology, Jamia Millia Islamia, Jamia Nagar, New Delhi 110 025, India$$;Solid State Physics Laboratory, Lucknow Road, Teemarpur, New Delhi 110 054, India$$

关键词: Raman spectroscopy;    metallic/semiconducting ratio;    chirality.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We present an investigation of the nature of single-walled carbon nanotubes (SWCNTs) in a bundle by resonant Raman spectroscopy. The calculation has been done for the three peak positions in radial breathing mode (RBM) spectra obtained by using a laser excitation wavelength (𝜆) of 633 nm from He–Ne laser on SWNT bundle sample prepared by chemical vapor deposition (CVD) technique using iron catalyst at 800° C. The detailed analysis in the present study is focused on peak positions 162 cm-1, 186 cm-1, and 216 cm-1. The first step of the analysis is to construct a list of possible (𝑛, 𝑚) pairs from the diameters calculated from the RBM peak positions. The parameters of SWNTs studied gives in-depth understanding of many symmetry, resonance and characteristic properties of SWNT bundles. Our results indicate that the contribution of metallic SWNTs in the bundle is small at RBM peak positions 162 cm-1, 186 cm-1 and in agreement with pervious results at peak position 216 cm-1.

【 授权许可】

Unknown