Magnetic iron-containing nanoparticles on the surface of multiwalled carbon nanotubes

Based on the temperature dependence of the hyperfine parameters of the 57Fe nuclei, the qualitative and quantitative phase composition of nanocrystalline iron oxides on the surface and on the tails of the “classic” multiwalled carbon nanotubes (CNT) was investigated. From the observed temperature dependence it was shown that the contribution of the nonmagnetic iron-containing phase is caused by small size nanoparticles on the CNTs surface.