Journal ArticleDOI
Intensities of the Raman-active modes in single and multiwall nanotubes
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TLDR
In this article, the phonon symmetries in the Raman spectra of single and multi-wall nanotubes were investigated by using linearly and circularly polarized light.Abstract:
We investigated the phonon symmetries in the Raman spectra of single and multiwall nanotubes. By using linearly and circularly polarized light we measured the Raman tensor invariants on unoriented carbon nanotubes. The ratio between the antisymmetric and the isotropic invariant shows that Raman scattering in semiconducting single wall tubes is mainly due to fully symmetric ${A}_{1(g)}$ phonons with a strongly uniaxial Raman tensor. With the help of recent experiments on aligned nanotubes we calculate the relative intensities for the high-energy modes of different symmetry. Compared to single wall tubes the intensity of the ${E}_{1(g)}$ and ${E}_{2(g)}$ symmetry phonons in multiwall tubes is 1.5 times stronger. The antisymmetric component of the resonant Raman process was found to be zero in all measurements.read more
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Accurate density functional calculations for the phonon dispersion relations of graphite layer and carbon nanotubes
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Characterisation of carbonaceous materials using Raman spectroscopy: a comparison of carbon nanotube filters, single- and multi-walled nanotubes, graphitised porous carbon and graphite
TL;DR: In this paper, the spectral properties of MWCNTs were analyzed using two-excitation wavelengths, 532 and 785 nm, with special emphasis paid to the D-, G- and G′-bands.
Journal ArticleDOI
Radius and chirality dependence of the radial breathing mode and the G-band phonon modes of single-walled carbon nanotubes
TL;DR: In this article, the radial breathing and vibrational modes of all 300 single-walled carbon nanotubes in the radius range from $2\phantom{\rule{0.3em}{0ex}} text{to}\phantom{0,3em,0ex} 12\phantastic{ 0.3m,0.1m}
Journal ArticleDOI
Evaluating arbitrary strain configurations and doping in graphene with Raman spectroscopy
Niclas S. Mueller,Sebastian Heeg,Sebastian Heeg,Miriam Peña Alvarez,Patryk Kusch,Soeren Wasserroth,Nick Clark,Fredrik Schedin,John Parthenios,Konstantinos Papagelis,Konstantinos Papagelis,Costas Galiotis,Costas Galiotis,Martin Kalbac,Aravind Vijayaraghavan,Uwe Huebner,Roman V. Gorbachev,Otakar Frank,Stephanie Reich +18 more
TL;DR: In this article, a correlation analysis of the 2D and G frequencies of the Raman spectrum of Graphene was performed to obtain the local hydrostatic strain, shear strain and doping without any assumption on the strain configuration prior to the analysis.