Broadband Full-Spectrum Raman Excitation Mapping Reveals Intricate Optoelectronic-Vibrational Resonance Structure of Chirality-Pure Single-Walled Carbon Nanotubes.

Content Provider	Europe PMC
Author	Finnie, Paul Ouyang, Jianying Fagan, Jeffrey A.
Copyright Year	2023
Abstract	The Raman excitation spectra of chirality-pure (6,5),(7,5), and(8,3) single-walled carbon nanotubes (SWCNTs) are explored for homogeneoussolid film samples over broad excitation energy and scattering energyranges using a rapid and relatively simple full spectrum Raman excitationmapping technique. Identification of variation in scattering intensitywith sample type and phonon energy related to different vibrationalbands is clearly realized. Excitation profiles are found to vary stronglyfor different phonon modes. Some modes’ Raman excitation profilesare extracted, with the G band profile compared to earlier work. Othermodes, such as the M and iTOLA modes, have quite sharp resonance profilesand strong resonances. Conventional fixed wavelength Raman spectroscopycan miss these effects on the scattering intensities entirely dueto the significant intensity changes observed for small variationsin excitation wavelength. Peak intensities for phonon modes traceableto a pristine carbon lattice forming a SWCNT sidewall were greaterfor high-crystallinity materials. In the case of highly defectiveSWCNTs, the scattering intensities of the G band and the defect-relatedD band are demonstrated to be affected both in absolute intensitiesand in relative ratio, with the ratio that would be measured by singlewavelength Raman scattering dependent on the excitation wavelengthdue to differences in the resonance energy profiles of the two bands.Lastly it is shown that the approach of this contribution yields aclear path toward increasing the rigor and quantification of resonanceRaman scattering intensity measurements through tractable correctionsof excitation and emission side variations in efficiency with excitationwavelength.
ISSN	19360851
Journal	ACS Nano
Volume Number	17
PubMed Central reference number	PMC10134487
Issue Number	8
PubMed reference number	37010116
e-ISSN	1936086X
DOI	10.1021/acsnano.2c10524
Language	English
Publisher	American Chemical Society
Publisher Date	2023-04-03
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). Crown © 2023. Published by American Chemical Society
Subject Keyword	Raman spectroscopy carbon nanotube resonantexcitation Raman excitation mapping Raman excitationprofile single-walled carbon nanotube
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Physics and Astronomy Engineering Materials Science