Magnetic characterization of vanadium oxide/polyaniline nanotubes

Autor(es)

Saleta‚ ME ; Curiale‚ J. ; Troiani‚ HE ; Ribeiro Guevara‚ S. ; Sánchez‚ RD ; Malta‚ M. ; Torresi‚ RM

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 254, n. 1, p. 371-374, 2007.

Resumo

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-wail structure of the nanotubes. The static magnetic susceptibility measured at different magnetic fields shows 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+(3d(1)) 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. (C) 2007 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 03/10015-3 - Arranjos organizados de macromoléculas e nanoestruturas para o desenvolvimento de sensores e microbaterias
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático