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Journal of Nanomaterials
Volume 2018, Article ID 3410306, 6 pages
https://doi.org/10.1155/2018/3410306
Research Article

Temperature Dependence of G Mode in Raman Spectra of Metallic Single-Walled Carbon Nanotubes

1School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
3State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
4College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
5Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

Correspondence should be addressed to Zhijie Wen; moc.liamg@2350tsuds and Maoshuai He; moc.liamg@iauhsoameh

Received 22 February 2018; Accepted 28 May 2018; Published 17 July 2018

Academic Editor: Bhanu P. Singh

Copyright © 2018 Qianru Wu 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.

Abstract

The temperature evolution of G mode in the Raman spectra of surface grown single-walled carbon nanotubes (SWNTs) is investigated. It is revealed that the intensity of G mode in Raman spectra varies with the measurement temperature. The intensity variation of the G mode is synchronized to that of the radial breathing mode, which is sensitive to the resonance condition (). Such an intensity evolution is associated with the temperature-induced change of . That is, the intensity of G, an indication of electron-phonon coupling in metallic SWNTs, can be greatly enhanced only when the laser energy well matches the transition energy of nanotubes (). In other words, the window for observing asymmetric and broad G mode is very narrow. This work further confirms that the G mode in the Raman spectrum mainly arises from metallic SWNTs, and caution should be paid when using the intensity ratio of G/G+ to estimate the percentage of metallic SWNTs in products.