Název: RESPONSE OF SURFACE MORPHOLOGY IN COBALT-FULLERENE MIXTURE FILMS UPON VARIATION OF THE METAL CONTENT
Autoři: Lavrentiev, Vasyl ; Lavrentieva, Inna ; Vacík, Jiří
Typ dokumentu: Příspěvky z konference
Konference/Akce: NANOCON 2014. International Conference /6./, Brno (CZ), 2014-11-05 / 2014-11-07
Rok: 2015
Jazyk: eng
Abstrakt: 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.
Klíčová slova: Cobalt; Fullerene; mixture; phase transformation; roughness; surface
Zdrojový dokument: NANOCON 2014. 6th International conference proceedings, ISBN 978-80-87294-53-6

Instituce: Ústav jaderné fyziky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0245967

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-181146


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav jaderné fyziky
Konferenční materiály > Příspěvky z konference