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

0367520 - FZÚ 2012 RIV US eng J - Journal Article
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. E-ISSN 1932-7455
R&D Projects: GA ČR GAP204/10/1677
Institutional research plan: CEZ:AV0Z10100520; CEZ:AV0Z40400503
Keywords : metal catalyst particles * carbon nanotubes * superparamagnet * core-shell model * inter-particle interactions
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 4.805, year: 2011
http://pubs.acs.org/doi/abs/10.1021/jp203365g

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.
Permanent Link: http://hdl.handle.net/11104/0202172