We compare the local order in single-wall carbon nanotubes (SWCNTs) and highly oriented pyrolitic graphite (HOPG) by means of nanoscale transmission extended energy loss fine structure (EXELFS) measurements above the carbon K edge. The HOPG EXELFS spectra and their Fourier transform were compared to their synchrotron extended X-ray absorption fine structure (EXAFS) counterpart and discussed within a multiple scattering framework. By comparing the experimental EXELFS data to spectra calculated using a theoretical model based on a single scattering approach, we showed the fundamental importance of considering multiple paths (involving up to eight body scattering) to reproduce the fine details of EXELFS features. Simulating EXELFS spectra of SWCNTs by our theoretical model is shown to represent a measure of their chiralities. Finally, the shrinkage of the nearest-neighbor distance in the Fourier transform observed for SWCNTs (absent in graphite) is interpreted within a simple model invoking anharmonic effects.

Castrucci, P., Tombolini, F., Scarselli, M., Scilletta, C., De Crescenzi, M., Diociaiuti, M., et al. (2009). Comparison of the local order in highly oriented pyrolitic graphite and bundles of single-wall carbon nanotubes by nanoscale extended energy loss spectra. JOURNAL OF PHYSICAL CHEMISTRY. C, 113(12), 4848-4855 [10.1021/jp810936c].

Comparison of the local order in highly oriented pyrolitic graphite and bundles of single-wall carbon nanotubes by nanoscale extended energy loss spectra

CASTRUCCI, PAOLA;SCARSELLI, MANUELA ANGELA;DE CRESCENZI, MAURIZIO;
2009

Abstract

We compare the local order in single-wall carbon nanotubes (SWCNTs) and highly oriented pyrolitic graphite (HOPG) by means of nanoscale transmission extended energy loss fine structure (EXELFS) measurements above the carbon K edge. The HOPG EXELFS spectra and their Fourier transform were compared to their synchrotron extended X-ray absorption fine structure (EXAFS) counterpart and discussed within a multiple scattering framework. By comparing the experimental EXELFS data to spectra calculated using a theoretical model based on a single scattering approach, we showed the fundamental importance of considering multiple paths (involving up to eight body scattering) to reproduce the fine details of EXELFS features. Simulating EXELFS spectra of SWCNTs by our theoretical model is shown to represent a measure of their chiralities. Finally, the shrinkage of the nearest-neighbor distance in the Fourier transform observed for SWCNTs (absent in graphite) is interpreted within a simple model invoking anharmonic effects.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - Fisica della Materia
English
Con Impact Factor ISI
Anharmonic effects; Carbon k edges; Energy-loss spectrum; Extended energy loss fine structures; Extended x-ray absorption fine structures; Highly oriented pyrolitic graphites; Local orders; Multiple paths; Nano-scale; Nearest neighbors; Simple models; Single scatterings; Single-wall carbon nanotubes; Theoretical models; Electron energy loss spectroscopy; Energy dissipation; Fourier transforms; Graphite; Nanostructured materials; Scattering; Single-walled carbon nanotubes (SWCN); Stereochemistry; Carbon nanotubes
Castrucci, P., Tombolini, F., Scarselli, M., Scilletta, C., De Crescenzi, M., Diociaiuti, M., et al. (2009). Comparison of the local order in highly oriented pyrolitic graphite and bundles of single-wall carbon nanotubes by nanoscale extended energy loss spectra. JOURNAL OF PHYSICAL CHEMISTRY. C, 113(12), 4848-4855 [10.1021/jp810936c].
Castrucci, P; Tombolini, F; Scarselli, Ma; Scilletta, C; DE CRESCENZI, M; Diociaiuti, M; Casciardi, S; Rosei, F; Khakani, M
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/30608
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