Magnetic Characterization of Vanadium Oxide/Polyaniline Nanotubes.

M.E. SALETA; J. CURIALE; H. E. TROIANI; S. RIBEIRO GUEVARA; R. D. SÁNCHEZ; M. MALTA; R. M. TORRESI

APPLIED SURFACE SCIENCE

Elsevier

Lugar: Amsterdam; Año: 2007 vol. 254 p. 371 - 374

0169-4332

We present a magnetic study of vanadium oxide nanotubes (VOx-NTs) with polyaniline (PAni). Transmission electron microscopy (TEM) shows the tubular shape and the multi-wall structure of the nanotubes. The static magnetic susceptibility measured at different magnetic fieldsshows a Curie behavior, while the magnetization versus magnetic field presents a non-linear dependence at low temperatures. Both experiments can be explained by the presence of paramagnetic ions with S = 1/2. Using Electron Paramagnetic Resonance technique, we identified as V4+(3d1) the paramagnetic ions present in the nanostructures. All the experimental results can be explained by a fraction between 14% and 18% of V4+ with respect to the total V atoms in the system.