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Designing Mixed Oxides Magnetic Nanoparticles for Sensing Applications

Published online by Cambridge University Press:  15 March 2011

Monica Sorescu ,
L. Diamandescu ,
A. Tomescu  and
S. Krupa
Monica Sorescu
Affiliation:
Duquesne University, Department of Physics, Pittsburgh, PA, U.S.A
L. Diamandescu
Affiliation:
Duquesne University, Department of Physics, Pittsburgh, PA, U.S.A National Institute for Materials Physics, Bucharest, Romania
A. Tomescu
Affiliation:
National Institute for Materials Physics, Bucharest, Romania
S. Krupa
Affiliation:
Duquesne University, Department of Physics, Pittsburgh, PA, U.S.A
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Abstract

Zirconium-doped hematite particles of the type xZrO2-(1-x)α-Fe2O3 (x=0.1, 0.5) were synthesized using mechanochemical activation and characterized by X-ray diffraction (XRD) and Mössbauer spectroscopy. XRD patterns yielded the dependence of lattice parameters and particle size as a function of ball milling time for each value of the molar concentration x. The Mössbauer spectra were fitted with one or alternatively, four sextets, corresponding to Zr ions substituting Fe ions in the hematite structure and further required the addition of a quadrupole-split doublet, representing Fe substituting Zr in the ZrO2 lattice. We further correlated the structural properties of the zirconium-doped hematite system with the sensing properties. These were measured as function of temperature, gas concentration (carbon monoxide and methane) and variable humidity of air. The material system was found to be sensitive over the entire range of CO concentrations and the linearity of the sensor signal was not affected by the relative humidity of air, which makes it the ideal system for sensing devices. Comparative results obtained for tin-doped hematite nanoparticles are also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1118: Symposium K – Magnetic Nanostructures by Design , 2008 , 1118-K03-03
Copyright
Copyright © Materials Research Society 2009

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References

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