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Structural and Magnetic Properties of Zn1-xCoxO Nanoparticles Prepared by a Simple Sol-Gel Method at Low Temperature

Published online by Cambridge University Press:  31 January 2011

Segundo R. Jáuregui-Rosas ,
Oscar Perales-Perez ,
S. Urcia-Romero ,
M. Asmat-Uceda  and
E. Quezada-Castillo
Segundo R. Jáuregui-Rosas
Affiliation:
[email protected], Universidad Nacional de Trujillo, Lab. Fisica de Materiales, Dpto. Fisica, Trujillo, Peru
Oscar Perales-Perez
Affiliation:
[email protected], University of Puerto Rico, Department of Engineering Science and Materials, Mayaguez, Puerto Rico
S. Urcia-Romero
Affiliation:
[email protected], University of Puerto Rico, Dartment of Physics, Mayaguez, Puerto Rico
M. Asmat-Uceda
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Mayaguez, Puerto Rico
E. Quezada-Castillo
Affiliation:
[email protected], Universidad Nacional de Trujillo, Lab. Fisica de Materiales, Dpto. Fisica, Trujillo, Peru
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Abstract

Pure and Zn1-xCoxO nanoparticles have been synthesized by a simple sol-gel method at low temperature where neither a chelating agent nor subsequent annealing was required. The effect of Cobalt atomic fraction, ‘x’ ≤ 0.0625, on the structural and magnetic properties of the doped ZnO powders was evaluated. X-ray diffraction and Fourier-transform infrared spectroscopy analyses evidenced the exclusive formation of the ZnO-wurtzite structure; no isolated Co-phases were detected. The linear dependence of cell parameters a and c with ‘x’, suggested the actual replacement of Zn by Co ions in the oxide lattice. Micro Raman spectroscopy measurements showed a band centered at 534cm-1, which can be assigned to a local vibrational mode related to Co species, in addition to the normal modes associated with wurtzite. The intensity and broadening of this band at 534 cm-1 were enhanced by increasing ‘x’. In turn, the other bands corresponding to A1 (E2, E1) and E2High modes were red shifted at higher Co contents. Room-temperature magnetization measurements revealed the paramagnetic behavior of the Co-doped ZnO nanoparticles.

Keywords

nanostructuresol-gelmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1201: Symposium H – Zinc Oxide and Related Materials-2009 , 2009 , 1201-H10-34
Copyright
Copyright © Materials Research Society 2010

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