Details

Autor(en) / Beteiligte

• SIMON, F
• KRAMBERGER, Ch
• PFEIFFER, R
• KUZMANY, H
• ZOLYOMI, V
• KüRTI, J
• SINGER, P. M
• ALLOUL, H

Titel

Isotope engineering of carbon nanotube systems

Ist Teil von

• Physical review letters, 2005-07, Vol.95 (1), p.017401.1-017401.4, Article 017401

Ort / Verlag

Ridge, NY: American Physical Society

Erscheinungsjahr

2005

Quelle

PROLA

Beschreibungen/Notizen

• The synthesis of a unique isotope engineered system, double-wall carbon nanotubes with natural carbon outer and highly 13C enriched inner walls, is reported from isotope enriched fullerenes encapsulated in single-wall carbon nanotubes (SWCNTs). The material allows the observation of the D line of the highly defect-free inner tubes that can be related to a curvature induced enhancement of the electron-phonon coupling. Ab initio calculations explain the inhomogeneous broadening of inner tube Raman modes due to the distribution of different isotopes. Nuclear magnetic resonance shows a significant contrast of the isotope enriched inner SWCNTs compared to other carbon phases and provides a macroscopic measure of the inner tube mass content. The high curvature of the small diameter inner tubes manifests in an increased distribution of the chemical shift tensor components.