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Pressure-induced phase transitions of C70 nanotubes
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2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 18, 8918-8922 p.Article in journal (Refereed) Published
Abstract [en]

Single crystalline C70 nanotubes having a face-centered-cubic (fcc) structure with diameters on a nanometer scale were synthesized by a facile solution method. In situ high pressure Raman spectroscopy and X-ray diffraction have been employed to study the structural stability and phase transitions of the pristine sample. We show that the molecular orientation-related phase transition from the fcc structure to a rhombohedral structure occurs at about 1.5 GPa, which is 1 GPa higher than in bulk C70. Also, the C70 molecules themselves are more stable in the nanotubes than in bulk crystals, manifested by a partial amorphization at 20 GPa. The crystal structure of C70 nanotubes could partially return to the initial structure after a pressure cycle above 30.8 GPa, and the C70 molecules were intact up to 43 GPa. The bulk modulus of C70 nanotubes is measured to be 50 GPa, which is twice larger than that of bulk C70.

Place, publisher, year, edition, pages
American Chemical Society , 2011. Vol. 115, no 18, 8918-8922 p.
Keyword [en]
Fullerenes, C70, polymerization, high pressure, Raman scattering, nanotubes, X-ray diffraction
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-44206DOI: 10.1021/jp2005666OAI: oai:DiVA.org:umu-44206DiVA: diva2:419166
Funder
Swedish Research Council, 621-2010-3732
Available from: 2011-05-25 Created: 2011-05-25 Last updated: 2015-09-28Bibliographically approved

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Yao, MingguangSundqvist, BertilWågberg, Thomas
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