High coercivity of iron-filled carbon nanotubes synthesized on austenitic stainless steel

Luca Camilli, M. Scarselli, Silvano del Gobbo, P. Castrucci, Francesca Romana Lamastra, Francesca Nanni, E. Gautron, S. Lefrant, F. D'Orazio, F. Lucari

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Multiwalled carbon nanotubes synthesized directly on austenitic stainless steel result in being filled with pure iron nanoparticles. X-ray diffraction shows that the nanoparticles are either in the c- or a-phase, although iron in the original alloy is in c-phase because of the presence of nickel. This phase transformation is due to the selective extraction of iron, performed by carbon nanotubes during their growth. A high coercivity of iron-filled carbon nanotubes is measured although the starting steel is paramagnetic. The presence of the a-phase, the magnetic anisotropy and the single domain character of the Fe nanoparticles explain their magnetic behavior.
Original languageEnglish
JournalCarbon
Volume50
Pages (from-to)718-721
Number of pages4
ISSN0008-6223
DOIs
Publication statusPublished - 22 Sep 2011
Externally publishedYes

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