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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:17 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Solid State Physics and Materials Science
Title:
Raman Spectroscopy Studies on Tri-layers Graphene and Single-walled Carbon Nanotubes
Authors:
Danut BALAN (1), Ioan BALTOG (2), Marius ENACHESCU (3), Ciceron BERBECARU (1)
Affiliation:
1) University of Bucharest, Faculty of Physics, Fizicienilor nr.5, Magurele 077125, Romania
2) National Institute of Materials Physics, P.O. Box MEG-7, Bucharest R-77125, Romania
3) Center for Surface Science and Nanotechnology, University POLITEHNICA Bucharest, Splaiul Independentei nr. 313, AN031, District 6, Bucharest
E-mail
danutz_nightshot@yahoo.com, ibaltog@infim.ro, marius.enachescu@upb.ro, berbecaru2ciceron@yahoo.com
Keywords:
Raman spectroscopy, single-walled carbon nanotubes, tri-layers grapheme
Abstract:
The Raman Scattering studies on single-walled carbon nanotubes (SWCNT) obtained by laser ablation in a dedicated reactor, and stiff layered structure of surfactant intercalated with tri-layers graphene (TLG) have identified the active modes in structures. SWCNT analysis showed the purity of the nanotubes, i.e. the presence of the used catalyst and the type of nanotubes (semiconductor or metal) correlate with their diameters. The orientation of the polarized laser excitation light along to the TLG’s edges induces a higher intensity of the D and 2D Raman bands compared with the perpendicular incidence to the plane of the structure of the laser radiation which reduced to half intensity. The two lorentzian components of 2D Raman band which are splitted by ~ 40 cm-1 were found to originate from the Casimir effect as a consequence of interplanar forces which move the planes of the hexagonal rings of carbon atoms relative to each other.
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