Počet záznamů: 1

Magnetic properties of iron catalyst particles in HiPco single wall carbon nanotubes

  1. 1.
    0367520 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Bittová, Barbara - Poltierová Vejpravová, Jana - Kalbáč, Martin - Burianová, Simona - Mantlíková, A. - Daniš, S. - Doyle, S.
    Magnetic properties of iron catalyst particles in HiPco single wall carbon nanotubes.
    Journal of Physical Chemistry C. Roč. 115, č. 35 (2011), s. 17303-17309 ISSN 1932-7447
    Grant CEP: GA ČR GAP204/10/1677
    Výzkumný záměr: CEZ:AV0Z10100520; CEZ:AV0Z40400503
    Klíčová slova: metal catalyst particles * carbon nanotubes * superparamagnet * core-shell model * inter-particle interactions
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 4.805, rok: 2011

    We have investigated the magnetic response of residual metal catalyst in the raw and super purified HiPco single wall carbon nanotubes (HiPco_raw and HiPco_SPSWCNTs). It has been shown that the residual metal catalyst is in the form of nanoparticles, even in the HiPco_SP SWCNTs that should contain a minimal amount of the metal. Moessbauer spectroscopy of the HiPco_raw SWCNTs proved the catalyst nanoparticles are in the form of Fe3C. Analysis of the synchrotron X-ray diffraction data provided an average diameter of nanoparticles about 1.9 nm. Magnetic studies by means of temperature dependence of magnetization, magnetization isotherms and susceptibility suggested that the nanoparticles obey the behavior of weakly interacting superparamagnetic systems in both samples.
    Trvalý link: http://hdl.handle.net/11104/0202172