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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:35 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Solid State Physics and Materials Science
Title:
Raman Spectroscopy studies on single-walled carbon nanotubes and tri-layers graphene
Authors:
Danut BALAN (1), Ioan BALTOG (2), Mihaela BAIBARAC (2), Ciceron BERBECARU (1,3)
Affiliation:
(1)University of Bucharest, Faculty of Physics, University of Bucharest, Fizicienilor nr.5, Magurele 077125, Romania,
(2) National Institute of Materials Physics, P.O. Box MEG-7, Bucharest R-77125, Romania
3Romanian Materials Science-Crystal Growth Society, 077125 Bucharest, Romania
E-mail
danutz_nightshot@yahoo.com, ibaltog@infim.ro, berbecaru2ciceron@yahoo.com
Keywords:
Raman spectroscopy, single-walled carbon nanotubes, tri-layers grapheme, Casimir effect
Abstract:
Polarized Raman scattering studies on single-walled carbon nanotubes highly separated into semiconductor (pure 99%) and metallic (pure 98%) components and stiff layered structure of surfactant intercalated with tri-layers graphene (TLG) were accomplished under resonant and non-resonant optical excitation wavelength. Whatever the optical excitation wavelength and supports (Au, Ag) used, different configuration of surface-enhanced Raman scattering on single-walled carbon nanotubes highlights an abnormally anti-Stokes Raman emission, only in the case of semiconductor component. Besides this, a strongly anisotropic Raman emission of the semiconductor component is also revealed depending on the light polarized related to the axes of the nanotubes with a different profile of the G band in the anti-Stokes branch. Orientation of the polarized laser excitation light along to the TLG’s edges induces a highest intensity of the D and 2D Raman bands in relation to the perpendicular incidence of radiation to the plane of the structure. The two lorentzian components of 2D Raman band splitted by ~40 cm-1 arise from a Casimir effect which is a consequence of interplanar forces that move the planes containing hexagonal rings of carbon atoms relative to each other.
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