Anharmonicity in single-wall carbon nanotubes as evidenced by means of extended energy loss fine structure spectroscopy analysis
- Dipartimento di Fisica, Unita INFM, Universita di Roma 'Tor Vergata', Via della Ricerca Scientifica 1, 00133 Rome (Italy)
- Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanita, 00161 Rome (Italy)
- Dipartimento di Igiene del Lavoro, ISPSEL, 00040 Monte Porzio Catone (Italy)
- Institut National de la Recherche Scientifique, INRS-Energie, Materiaux et Telecommunications 1650, Boulevard Lionel-Boulet, Case Postale 1020, Varennes, Quebec J3X 1S2 (Canada)
A comparative study of the structure of free-standing parallel bundles of single-wall carbon nanotubes (SWCNTs), multiwalled carbon nanotubes (MWCNTs), and highly oriented pyrolytic graphite (HOPG) was achieved by means of transmission electron microscopy and electron energy loss spectroscopy analyses. In particular, the carbon K (1s) extended fine structure of SWCNTs is found to be characterized by an apparent contraction of the nearest neighbors distance. This contraction is interpreted here to originate from an asymmetric pair distribution function, mostly due to the high out-of-plane vibrational motion of the C atoms, as for the case of chemisorbed atoms on clean surfaces. In contrast, the MWCNTs did not exhibit any signature of such an anharmonic effect because of their more rigid structure. This indicates that the SWCNTs pair potential is significantly broader and its effect is much weaker than that experienced by the same C-C pair embedded in a multiwall nanotube.
- OSTI ID:
- 20976662
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevB.75.035420; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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