Original title: RESPONSE OF SURFACE MORPHOLOGY IN COBALT-FULLERENE MIXTURE FILMS UPON VARIATION OF THE METAL CONTENT
Authors: Lavrentiev, Vasyl ; Lavrentieva, Inna ; Vacík, Jiří
Document type: Papers
Conference/Event: NANOCON 2014. International Conference /6./, Brno (CZ), 2014-11-05 / 2014-11-07
Year: 2015
Language: eng
Abstract: The morphology and roughness of the films show great change around some critical composition x(c) of the mixture film (x(c) approximate to 3). The films with lower Co content (x < 3) is rather smooth and the roughness is rather low. However, if x >= 3, the roughness of the CoxC60 films dramatically increases and sharp protrusions appear on the surface that reflects an important phase transformation in the film structure. The obtained AFM results define the concentration interval of the Co solubility in solid C-60 (x < 3), which was found to be narrower than that evaluated from spectroscopic experiments (see the text). This interval suggests a formation of the Co1C60 and Co2C60 fullerides in the CoxC60 mixtures where the Co atoms occupy the tetrahedral holes in the fullerene lattice. The dramatic change of the surface morphology at x >= 3 reflects the pronounced Co clustering which likely occurs due to numerical filling the octahedral pores. Formation of the protrusions on the surface of the supersaturated CoxC60 mixture films (x > 3) is a consequence of the compressive stress arising in the film due to the Co clustering.
Keywords: Cobalt; Fullerene; mixture; phase transformation; roughness; surface
Host item entry: NANOCON 2014. 6th International conference proceedings, ISBN 978-80-87294-53-6

Institution: Nuclear Physics Institute AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0245967

Permalink: http://www.nusl.cz/ntk/nusl-181146


The record appears in these collections:
Research > Institutes ASCR > Nuclear Physics Institute
Conference materials > Papers
 Record created 2015-04-16, last modified 2023-12-06


No fulltext
  • Export as DC, NUŠL, RIS
  • Share