Observing Axial Chirality of Chiral Single-Wall Carbon Nanotubes by Helicity-Dependent Raman Spectra
Journal
Nano Letters
Journal Volume
23
Journal Issue
18
Start Page
8454
End Page
8459
ISSN
15306984
15306992
Date Issued
2023
Author(s)
Abstract
Helicity-dependent Raman spectra of an isolated, chiral, single-wall carbon nanotube (SWNT) are reported using circularly polarized light. A polar plot of polarized Raman intensity for the radial breathing mode (RBM), which is excited by left-handed or right-handed circularly polarized light, shows asymmetric angle dependence relative to the nanotube axis direction, which reflects the axial chirality of a SWNT. The asymmetry in the polar plot of the RBM can be analyzed by a complex Raman tensor. The complex phase of each component of the Raman tensor has a maximum at chiral angle θ = 15° of a SWNT which is between two achiral SWNTs, that is, zigzag (θ = 0°) and armchair (θ = 30°) SWNTs. Considering the interaction between the chiral SWNT and the circularly polarized light, we discuss the origin of the complex phases excited by the opposite helicity of the circularly polarized light.
Subjects
Circularly Polarized Raman Spectroscopy
Complex Raman Tensor
Handedness
Single-wall Carbon Nanotubes
Chirality
Circular Polarization
Light Polarization
Nuclear Magnetic Resonance Spectroscopy
Raman Scattering
Single-walled Carbon Nanotubes (swcn)
Circularly Polarized Light
Circularly Polarized Raman Spectroscopy
Circularly-polarized
Complex Raman Tensor
Handedness
Helicities
Polarized Raman Spectroscopy
Raman Tensor
Single Wall
Single-wall Carbon Nanotube
Tensors
Publisher
American Chemical Society
Type
journal article