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

Luca Camilli*, Manuela Scarselli, Silvano Del Gobbo, Paola Castrucci, Francesca Romana Lamastra, Francesca Nanni, Eric Gautron, Serge Lefrant, Franco D'Orazio, Franco Lucari, Maurizio De Crescenzi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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 γ- or α-phase, although iron in the original alloy is in γ-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 α-phase, the magnetic anisotropy and the single domain character of the Fe nanoparticles explain their magnetic behavior.

Original languageEnglish (US)
Pages (from-to)718-721
Number of pages4
JournalCarbon
Volume50
Issue number2
DOIs
StatePublished - Jan 1 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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