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Titolo:
Rayleigh and Raman scattering from individual carbon nanotube bundles
Autore:
Yu, ZH; Brus, L;
Indirizzi:
Columbia Univ, Dept Chem, New York, NY 10027 USA Columbia Univ New York NY USA 10027 iv, Dept Chem, New York, NY 10027 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 6, volume: 105, anno: 2001,
pagine: 1123 - 1134
SICI:
1520-6106(20010215)105:6<1123:RARSFI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTICAL-ABSORPTION SPECTROSCOPY; ELECTRONIC-STRUCTURE; ROOM-TEMPERATURE; GRAPHENE TUBULES; DIAMETER; MICROSCOPY; HYDROGEN; GROWTH; ADSORPTION; CHANNELS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Brus, L Columbia Univ, Dept Chem, New York, NY 10027 USA Columbia Univ New York NY USA 10027 Chem, New York, NY 10027 USA
Citazione:
Z.H. Yu e L. Brus, "Rayleigh and Raman scattering from individual carbon nanotube bundles", J PHYS CH B, 105(6), 2001, pp. 1123-1134

Abstract

Rayleigh scattering spectra and Raman spectra from single bundles of aligned single-wall carbon nanotubes (SWNTs) have been obtained with dark field optical microscopy and Raman microscopy. Rayleigh scattering spectrum reveals resonance peaks due to the optically allowed interband transitions in SWNTs. The intensity of the resonance peaks was found to depend strongly on the incident light polarization. These resonance peaks are completely suppressed when the incident light polarization is perpendicular to the nanotube axis, suggesting that the int interband transition dipole in SWNTs is orientated parallel to the tube axis. Polarized Raman measurements on aligned nanotubes in a single bundle show that the Raman scattering is polarized along the nanotube axis direction, and Raman scattering signal is strongest when the incident laser is polarized parallel to the tube axis. All strong Raman active modes behave as A(1g). Tangential carbon stretching mode Raman scattering from semiconducting tubes shows very little change from bundle to bundle, while that from metallic SWNTs exhibits large variations. The broadened metallic Raman scattering at 1550 cm(-1) can be well fitted by a Fano line shape function. This broadened Raman scattering depends sensitively onsample processing conditions. Charge transfer due to chemical doping is proposed to explain the change in Raman scattering from oxidized metallic tubes.

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Documento generato il 05/04/20 alle ore 10:55:53