Reinterpretation of Single-Wall Carbon Nanotubes by Raman Spectroscopy

Yeseul Park, K. P.S.S. Hembram, Ran Yoo, Byungjin Jang, Wooyoung Lee, Sang Gil Lee, Jin Gyu Kim, Yong Il Kim, Dong Ju Moon, Jeon Kook Lee, Jae Kap Lee

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Abstract

Raman spectra of single-wall carbon nanotubes (SWNTs) exhibit a unique radial breathing mode (RBM) band (∼100-300 cm-1) and a G- peak (∼1570 cm-1), along with a D band (∼1350 cm-1). We show that the typical Raman signals for SWNTs are the signature of their helical structure determined using density functional theory simulation and structural analysis for hydrogenated and dehydrogenated SWNT samples. We demonstrate that the G- mode at ∼1570 cm-1 is unique to opened tubular graphene structures of ∼2 nm diameter. We also demonstrate that the D mode of ∼1350 cm-1 is originated from edge defects of opened SWNTs, revealing strong eigenvectors, which is absent in concentric tubes. We also report a radial-tangential mode (RTM) for concentric and opened SWNTs, which appears following RBM. We also interpret the low-energy Raman signal, reported as an RBM band, to be convolution of "localized RBM" (∼170 cm-1) and RTM (∼190 cm-1) for helical SWNTs. We also show that the analysis of the Raman spectra of SWNTs is consistent with general understanding on Raman analysis of carbon materials.

Original languageEnglish
Pages (from-to)14003-14009
Number of pages7
JournalJournal of Physical Chemistry C
Volume123
Issue number22
DOIs
Publication statusPublished - 2019 Jun 6

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Park, Y., Hembram, K. P. S. S., Yoo, R., Jang, B., Lee, W., Lee, S. G., Kim, J. G., Kim, Y. I., Moon, D. J., Lee, J. K., & Lee, J. K. (2019). Reinterpretation of Single-Wall Carbon Nanotubes by Raman Spectroscopy. Journal of Physical Chemistry C, 123(22), 14003-14009. https://doi.org/10.1021/acs.jpcc.9b02174