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Polymerization of the rotor-stator compound C60-cubane under pressure.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 2, 024114- p.Article in journal (Refereed) Published
Abstract [en]

Cubane, C8H8, can be inserted into the octahedral voids of fullerene lattices to create a family of rotor-stator compounds. We have investigated the structural phase behavior of C60 center dot C8H8 by annealing a number of samples for up to 3 h at selected temperatures in the range 380-870 K under pressures up to 2 GPa. The high-pressure treated materials were then investigated under ambient conditions using Raman spectroscopy and x-ray diffraction. C60 center dot C8H8 is found to have at least five different structural phases depending on treatment conditions. In addition to the known cubic and orthorhombic structures observed at atmospheric pressure, we find two polymeric states with pseudocubic and pseudoorthorhombic structures, respectively, based on the two original lattices and created by heating in different pressure ranges. These materials are believed to be copolymers of C60 and decomposition products of cubane. In contrast to the polymeric states of C60 the present polymer structures are determined by the topology of the original lattices rather than by the molecular structure. Above 700 K we find a carbon-rich amorphous state created when the cubane finally decomposes, releasing its hydrogen content in the form of hydrocarbons.

Place, publisher, year, edition, pages
2007. Vol. 75, no 2, 024114- p.
Keyword [en]
polymerisation, fullerenes, C60, cubane, annealing, high pressure, Raman spectroscopy, X-ray diffraction, co-polymer, voids (solid)
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-11956DOI: 10.1103/PhysRevB.75.024114OAI: diva2:151627

Selected for Virtual J. Nanoscale Sci. & Technol. vol. 15, issue 5 (Febr. 2007). Selected for Virtual J. Biol. Phys. Res. vol. 13, issue 3 (Febr. 2007)

Available from: 2007-10-19 Created: 2007-10-19 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.
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
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)
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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