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Well-defined sized (5–10 nm) metallic iron nanoparticles (NPs) with body-centered cubic structure encapsulated inside the tip of millimeter-long vertically aligned carbon nanotubes (VACNTs) of uniform length have been investigated with high-resolution transmission electron microscopy and soft X-ray spectroscopy techniques. Surface-sensitive and chemically-selective measurements have been used to evaluate the magnetic properties of the encapsulated NPs. The encapsulated Fe NPs display magnetic remanence up to room temperature, low coercivity, high chemical stability and no significant anisotropy. Our surface-sensitive measurements combined with the specific morphology of the studied VACNTs allow us to pinpoint the contribution of the surface oxidized or hydroxidized iron catalysts present at the VACNT–substrate interface.
Royal Society of Chemistry
Publication date: 
1 Jan 2017

Federica Bondino, Elena Magnano, Regina Ciancio, Carla Castellarin Cudia, Alessandro Barla, Elvio Carlino, Flora Yakhou-Harris, Nalin Rupesinghe, Cinzia Cepek

Biblio References: 
Volume: 19 Issue: 47 Pages: 32079-32085
Physical Chemistry Chemical Physics