Reinterpretation of single-wall carbon nanotubes by Raman spectroscopy

Title
Reinterpretation of single-wall carbon nanotubes by Raman spectroscopy
Authors
이전국문동주이재갑박예슬K. P. S. S. Hembram류란장병진이우영이상길김진규김용일
Keywords
CNT; Single-wall carbon nanotubes; Raman; Structure; Graphene; Helix; Electronic property
Issue Date
2019-06
Publisher
The Journal of Physical Chemistry C
Citation
VOL 123, NO 22-14009
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/69212
ISSN
1932-7447
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KIST Publication > Article
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