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Journal of Nanomaterials
Volume 2013, Article ID 615915, 6 pages
Research Article

Novel Method of Evaluating the Purity of Multiwall Carbon Nanotubes Using Raman Spectroscopy

1CNT Team, Hanwha Chemical, 80 Annamro 402 gil, Bupyeong-gu, Incheon 403-030, Republic of Korea
2Spectro, Gwangju 500-712, Republic of Korea
3Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea
4Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea

Received 15 October 2013; Accepted 29 October 2013

Academic Editor: Clare C. Byeon

Copyright © 2013 Young Chul Choi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose the quantitative method of evaluating the purity of multiwall carbon nanotubes (MWCNTs) using Raman spectroscopy. High purity MWCNTs were prepared by chemical vapor deposition (CVD) to be used as a reference material with 100% purity. Since the intensity and wavenumber of -band located at around 1500 cm−1 were found to be independent of the excitation wavelength of a laser, the purity of MWCNTs was measured by comparing the intensity ratio of -band to -band ( / ) of the sample with that of a reference material. The established method was verified by testing the mixture of amorphous carbon particles and reference MWCNTs.