2011 - Europe Direct Iasi

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EUROINVENT 2011
Innovative Researches
Students – MsD – PhD ‐ PostDoc
Research on electrodeposited Co-TiO2 nanocomposite thin
films
M. Poiana 1 , M. Dobromir 1 , A.V. Sandu 2 and V. Georgescu 1
1
Faculty of Physics “Al. I. Cuza” University of Iasi
2
Gheorghe Asachi Technical University of Iasi
Composites containing inserted TiO2 particles in a matrix of
magnetic Co are interesting nanostructured materials, due to the
photo catalytic properties of TiO2, combined with magnetic
properties of metallic film. The envisaged applications are in the
domain of magnetic sensors with photo electro catalytic
properties. Electrolysis is a convenient method used for
preparing such films due to its low cost and versatility.
Co-TiO2 nanocomposite films are electrodeposited onto
copper substrate using a bath containing CoSO4·7H2O, H3BO3, NaCl, Na2SO4·10H2O and dispersed TiO2 nanoparticles. The
TiO2 nanoparticles were added to the plating bath with
continuous magnetic stirring to ensure uniform dispersion of the
nanoparticles in the film. The films composition was controlled
by the addition of different concentrations of TiO2 nanoparticles
in the solution, and by applied voltage. The Co-TiO2 films were
characterized by X-ray photoelectron spectroscopy (XPS) and
scanning electron microscopy (SEM) analysis.
In addition to measuring hysteresis loops by an induction
type device with magnetic field applied in the film plane (50 Hz,
in a maximum field of 60 kA/m), a torque magnetometer
(Hmax=95kA/m) was used to study anisotropy of the samples, at
room temperature. Magnetoresistance (MR) measurements at
room temperature were carried out by usual four-terminal
method in dc magnetic field of ± 300 kA/m, applied
perpendicular to the current, in plane of the film. We have found
that the morphology, magnetotransport and magnetic properties
of the Co-TiO2 nanocomposite films are influenced by deposition
parameters, such as applied voltage, TiO2 nanoparticles
concentration and steering of the electrolyte.
Innovative Researches
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