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Low-temperature optical studies of C60-cubane rotor-stator compound
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2008 (English)In: Journal of Physics: Conference Series, vol. 100, part 5: Proceedings of the joint 17th International Vacuum Congress (IVC-17), 13th International Conference on Surface Science (ICSS-13), and the 2007 International Conference on Nanoscience and Technology (ICN+T 2007), 2–6 July 2007, Stockholm, Sweden, Institute of Physics (IOP), 2008, 052091- p.Conference paper, Published paper (Refereed)
Abstract [en]

We present here low-temperature Raman and photoluminescence spectra of the C60-cubane rotor-stator compound. We show the continuous evolution of Raman spectra between 77 K and room temperature, with no sharp transition visible at 140 K, the orientational ordering temperature. Low-temperature luminescence spectra of C60 in C60-cubane compound are found to be shifted and better resolved then spectra for pristine C60 at the corresponding temperatures, showing relatively weaker intermolecular interactions. In fact, the solid-state luminescence of C60-cubane is similar to free-molecule C60 luminescence spectra.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2008. 052091- p.
Series
Journal of Physics Conference Series, ISSN 1742-6596 ; 100
Keyword [en]
Fullerenes, photoluminescence, Raman spectroscopy, high pressure, cubane, rotor-stator compound, fullerene co-polymer
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-9420DOI: 10.1088/1742-6596/100/5/052091OAI: oai:DiVA.org:umu-9420DiVA: diva2:149091
Conference
Joint 17th International Vacuum Congress (IVC-17), 13th International Conference on Surface Science (ICSS-13), and the 2007 International Conference on Nanoscience and Technology (ICN+T 2007), 2–6 July 2007, Stockholm, Sweden
Note

Open access

Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2015-09-28Bibliographically approved
In thesis
1. Studies of carbon nanomaterials based on fullerenes and carbon nanotubes
Open this publication in new window or tab >>Studies of carbon nanomaterials based on fullerenes and carbon nanotubes
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Materials based on fullerenes and carbon nanotubes are very much different from most “traditional” materials, primarily because they are built from nanosized molecules with highly symmetry-dependent properties. Being the subject of a very active research field over the last twenty years, carbon nanostructures proved to be indeed extraordinary. Their splendid mechanical properties attract a great interest among material scientists. Their wide range of electrical properties, from ballistic conductors to insulators, makes them ideal candidates for future, better electronics. The possibilities seem to be nearly unlimited, with proposed applications ranging from quantum computing to medicine. However, in order to make it all happen one day, we first need to explore and understand the physics and chemistry of carbon nanomaterials. This work focuses on production and characterization of materials and structures in which fullerenes and/or carbon nanotubes are the main ingredients, and which can be produced or modified under high-pressure – high-temperature (hp-hT) conditions. Raman and photoluminescence spectroscopy, X-ray diffraction and scanning probe microscopy were employed for characterization of the samples. The research presented in this thesis is spread over a rather wide range of carbon nanomaterials. To highlight some of the main results – the first hp-hT polymerization of C60 nanorods and the C60-cubane compound is reported. The polymerization mechanism in the latter case was identified to be radically different from that in pure C60. The pressure-temperature diagram of C60-cubane is presented. A comparative study of C60 and C70 peapods under extreme p-T conditions reveals how the confinement affects the fullerenes’ ability for polymerization. Finally, in situ resistance measurements on Rb4C60 under high pressure show that the semiconducting character of this material persists at least up to 2 GPa, contradicting earlier reports on the existence of an insulator-to-metal transition and providing an insight into conduction mechanisms in this anomalous intercalated compound.

Place, publisher, year, edition, pages
Umeå: Fysik, 2007. 115 p.
Keyword
fullerenes, carbon nanotubes, fullerene polymers, intercalation compounds, high pressure, Raman spectroscopy, X-ray diffraction, atomic force microscopy, phase transitions
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:umu:diva-1312 (URN)978-91-7264-346-8 (ISBN)
Public defence
2007-09-24, KB3A9, KBC-huset, Umeå Universitet, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2007-08-28 Created: 2007-08-28 Last updated: 2015-09-28Bibliographically approved

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Iwasiewicz-Wabnig, AgnieszkaSundqvist, Bertil
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