Electronic structure and radial breathing mode for carbon nanotubes with ultra-high curvature

Autor(en)

Wolfgang Plank, Rudolf Pfeiffer, Christoph Schaman, Ludger Wirtz, Matteo Calvaresi, Francesco Zerbetto, Jannik Meyer, Hans Kuzmany

Abstrakt

Ultra-high curvature single-walled carbon nanotubes (SWCNTs) with diameters down to 0.37 nm were prepared by transformation of FeCp2 peapods to double-walled CNTs (DWCNTs). Results from resonance Raman scattering and high resolution transmission electron microscopy (TEM) were compared to calculations on the molecular dynamical, many electron corrected extended tight binding, and density functional theory (DFT) level. The growth process was found to be catalytic from Fe3C particles inside the tubes with dimensions of a crystallographic unit cell. The electronic structure showed dramatic deviations from tight binding results. The family behavior leads to level crossing already for E11 and E22 transitions. Experimental results fitted well into a KatauraPopov plot and allowed assignment for the observed Raman lines of the inner tubes. Experimental and calculated radial breathing mode (RBM) frequencies showed a systematic difference indicating a radial expansion of the smallest inner tubes and a radial compression for the larger tubes.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Institute for Electronics, Microelectronics, and Nanotechnology (CNRS UMR 8520), Università di Bologna, Universität Ulm

Journal

Physica Status Solidi. B: Basic Research

Band

247

Seiten

2774-2778

Anzahl der Seiten

5

ISSN

0370-1972

DOI

https://doi.org/10.1002/pssb.201000357

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/3c70205e-b7a6-454c-af5a-42d13092eff4