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Structural, Optical and Magnetic properties of Co-doped ZnO Nanopowders

Published online by Cambridge University Press:  14 January 2011

Segundo R. Jáuregui-Rosas ,
Oscar J. Perales-Perez ,
Lourdes A. Noriega  and
Luis A. Castillo
Segundo R. Jáuregui-Rosas
Affiliation:
Laboratorio de Física de Materiales, Departamento de Física, Universidad Nacional de Trujillo, Juan Pablo II Av. S/N, Trujillo - Peru.
Oscar J. Perales-Perez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico, Mayagüez, Puerto Rico 00681-9044, USA
Lourdes A. Noriega
Affiliation:
Escuela de Física, Universidad Nacional de Trujillo, Juan Pablo II Av. S/N, Trujillo - Peru.
Luis A. Castillo
Affiliation:
Escuela de Física, Universidad Nacional de Trujillo, Juan Pablo II Av. S/N, Trujillo - Peru.
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Abstract

Nanocrystalline Zn1-xCoxO powders exhibiting a preferential crystal growth along the (002) plane have been synthesized in the atomic fraction, ‘x’, range of 0.0-0.0625 by a wet chemical method. The effect of the dopant concentration on the corresponding structural, optical and magnetic properties was also evaluated. XRD analyses evidenced the development of single-phase wurtzite with no traces of any impurity for all the dopant levels. The higher intensity of the (002) peak, when compared to the XRD peaks in bulk ZnO, indicates the preferential crystal growth along the c-axis in hexagonal wurtzite cell. The linear dependence of cell parameters a and c with ‘x’ suggests the actual replacement of Zn by Co ions in the host oxide lattice. Micro Raman spectroscopy measurements showed a band centered at 535cm-1, which can be assigned to a local vibrational mode related to Co species in addition to the normal modes associated with wurtzite. The relative broadening of this band at 535cm-1 was enhanced by increasing ‘x’. The other characteristic bands of ZnO corresponding to A1 (E2, E1) and E2High modes were red shifted for all Co contents. UV-vis measurements showed that the energy band gap of as-synthesized nanopowders decreased with increasing Co2+ content up to x = 0.03 and increased for higher contents. Room-temperature magnetization measurements revealed the paramagnetic behavior of the Co-doped ZnO nanopowders.

Keywords

structuraloptical propertiesmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1292: Symposium K – Oxide Nanoelectronics , 2011 , mrsf10-1292-k08-09
Copyright
Copyright © Materials Research Society 2011

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References

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