TY - JOUR
T1 - Intensity Ratio of Resonant Raman Modes for (n,m) Enriched Semiconducting Carbon Nanotubes
AU - Piao, Yanmei
AU - Simpson, Jeffrey R.
AU - Streit, Jason K.
AU - Ao, Geyou
AU - Zheng, Ming
AU - Fagan, Jeffrey A.
AU - Hight Walker, Angela R.
PY - 2016/5/24
Y1 - 2016/5/24
N2 - Relative intensities of resonant Raman spectral features, specifically the radial breathing mode (RBM) and G modes, of 11, chirality-enriched, single-wall carbon nanotube (SWCNT) species were established under second-order optical transition excitation. The results demonstrate an under-recognized complexity in the evaluation of Raman spectra for the assignment of (n,m) population distributions. Strong chiral angle and mod dependencies affect the intensity ratio of the RBM to G modes and can result in misleading interpretations. Furthermore, we report five additional (n,m) values for the chirality-dependent G+ and G- Raman peak positions and intensity ratios; thereby extending the available data to cover more of the smaller diameter regime by including the (5,4) second-order, resonance Raman spectra. Together, the Raman spectral library is demonstrated to be sufficient for decoupling G peaks from multiple species via a spectral fitting process, and enables fundamental characterization even in mixed chiral population samples.
AB - Relative intensities of resonant Raman spectral features, specifically the radial breathing mode (RBM) and G modes, of 11, chirality-enriched, single-wall carbon nanotube (SWCNT) species were established under second-order optical transition excitation. The results demonstrate an under-recognized complexity in the evaluation of Raman spectra for the assignment of (n,m) population distributions. Strong chiral angle and mod dependencies affect the intensity ratio of the RBM to G modes and can result in misleading interpretations. Furthermore, we report five additional (n,m) values for the chirality-dependent G+ and G- Raman peak positions and intensity ratios; thereby extending the available data to cover more of the smaller diameter regime by including the (5,4) second-order, resonance Raman spectra. Together, the Raman spectral library is demonstrated to be sufficient for decoupling G peaks from multiple species via a spectral fitting process, and enables fundamental characterization even in mixed chiral population samples.
KW - Raman intensity ratio
KW - aqueous two phase separation
KW - chiral angle
KW - resonance Raman
KW - single-wall carbon nanotubes
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U2 - 10.1021/acsnano.6b01031
DO - 10.1021/acsnano.6b01031
M3 - Article
SN - 1936-0851
VL - 10
SP - 5252
EP - 5259
JO - ACS Nano
JF - ACS Nano
IS - 5
ER -