Reinterpretation of single-wall carbon nanotubes by Raman spectroscopy
- Reinterpretation of single-wall carbon nanotubes by Raman spectroscopy
- 이전국; 문동주; 이재갑; 박예슬; K. P. S. S. Hembram; 류란; 장병진; 이우영; 이상길; 김진규; 김용일
- CNT; Single-wall carbon nanotubes; Raman; Structure; Graphene; Helix; Electronic property
- Issue Date
- The Journal of Physical Chemistry C
- VOL 123, NO 22-14009
- Raman spectra of single-wall carbon nanotubes (SWNTs) exhibit unique radial breathing mode (RBM) band (~100-300 cm-1) and G- peak (~1570 cm-1), along with D band (~1350 cm-1). We show that the typical Raman signals for SWNTs are the signature of their helical structure with density functional theory simulation and structure analysis for hydrogenated and dehydrogenated SWNTs samples. We demonstrate that the G- mode at ~1570 cm-1 is unique to opened tubular graphene structures of ~2 nm in diameter. We also demonstrate that 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 radial-tangential mode (RTM) for concentric and opened SWNTs, which appears following RBM. We also interpret the low energy Raman signal, reported as 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 for the Raman spectra of SWNTs is consistent with general understanding on Raman analysis of carbon materials.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.