Magnetic characterization of vanadium oxide/polyaniline nanotubes

We present a magnetic study of vanadium oxide nanotubes (VO x -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 fields shows a Curie behavior,...

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Bibliographic Details
Published in:Applied surface science 2007-10, Vol.254 (1), p.371-374
Main Authors: Saleta, M.E., Curiale, J., Troiani, H.E., Ribeiro Guevara, S., Sánchez, R.D., Malta, M., Torresi, R.M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron paramagnetic resonance and relaxation
EPR
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
TEM
Vanadium oxide
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Summary:We present a magnetic study of vanadium oxide nanotubes (VO x -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 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 V 4+(3d 1) the paramagnetic ions present in the nanostructures. All the experimental results can be explained by a fraction between 14% and 18% of V 4+ with respect to the total V atoms in the system.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2007.07.075