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Synchrotron radiation study of the electronic structure of multiwalled carbon nanotubes
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2003 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 15, no 38, 6563- p.Article in journal (Refereed) Published
Abstract [en]

We present photoelectron (PE) and x-ray absorption spectra (XAS) of macroscopically aligned multiwalled carbon nanotubes. We identify the peaks in the valence PE spectra with regions of high density of states through comparison to calculations for graphite. Finally, we outline and illustrate a simple method for using XAS to determine the average alignment of a nanotube sample.

Place, publisher, year, edition, pages
2003. Vol. 15, no 38, 6563- p.
National Category
Natural Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-90869DOI: 10.1088/0953-8984/15/38/022OAI: oai:DiVA.org:uu-90869DiVA: diva2:163374
Available from: 2003-10-03 Created: 2003-10-03 Last updated: 2013-07-24Bibliographically approved
In thesis
1. Angle-Dependent Electron Spectroscopy Studies of C60 Compounds and Carbon Nanotubes
Open this publication in new window or tab >>Angle-Dependent Electron Spectroscopy Studies of C60 Compounds and Carbon Nanotubes
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fullerenes have been shown to constitute a prototypical building block for truly nanometer-sized devices and exotic nanounit-based materials, e.g., high-temperature superconductors. This makes the detailed understanding of fullerene electronic states in compounds and at interfaces of primary importance, since the high symmetry of the molecule greatly

simplifies the starting point of the analysis. Carbon nanotubes, which combine one macroscopic with two nanoscopic dimensions, are perhaps of even greater practical interest.

Angle-dependent electron spectroscopies have been employed in the present work to study these materials, characterizing their structure, bonding, and electronic states. For solid C60, the photoelectron angular distribution has been found to be essentially that of the free molecule, modified by solid state scattering; a similar distribution is found for K3C60.

The surface and bulk electronic structure of K3C60 has been identified by angle-dependent core and valence photoelectron spectroscopy (PES) and x-ray emission spectroscopy. An insulating surface layer has been identified for this high-temperature superconductor.

Angle-dependent valence PES is used to investigate the electronic states of C60/Al(110). Electron correlations are found to be the origin of the splitting observed in the molecular orbitals, which is quite sensitive to the molecular orientation. The components of the highest occupied molecular orbital are differentiated according to their overlap with the substrate.

A rigid shift of valence- and core-levels has been observed even for ionic and covalent C60 compounds, reflecting the efficient static polarizability screening of the molecule.

The alignment of multi-walled carbon nanotubes has been investigated by x-ray absorption spectroscopy, using the spectral intensity ratio of π*- and *-resonances. Core level combined with valence PES shows that the degree of defect structure varies from position to position on the sample. Valence photoelectron spectra of defect-free sample spots closely resembles the total DOS of graphite.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 74 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 890
Physics, fullerenes, C60, K3C60, multi-walled carbon nanotubes, molecules, clusters, electron spectroscopy, synchrotron radiation, x-ray absorption, x-ray emission, molecular orbitals, charge transfer, electron correlation, surface physics, Fysik
National Category
Physical Sciences
urn:nbn:se:uu:diva-3595 (URN)91-554-5748-7 (ISBN)
Public defence
2003-10-24, Pohlemsalen, Ångström Laboratory, Uppsala, 10:00
Available from: 2003-10-03 Created: 2003-10-03Bibliographically approved

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