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Elaboration and Characterization of ZnO Transition Metal (Co, Mn, Ni, Fe) Doped Aerogel Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Lassaad El Mir ,
Aroussi Ben Mahmoud ,
H.Jurgen von Bardeleben  and
Jean-Louis Cantin
Lassaad El Mir
Affiliation:
[email protected], Faculté des Sciences de Gabès, Physique des Matériaux et des Nanomatériaux Appliquée à l'Environnement, Gabès, 6072 Tunisia
Aroussi Ben Mahmoud
Affiliation:
[email protected], Faculté des Sciences de Gabès, Physique des Matériaux et des Nanomatériaux Appliquée à l'Environnement, Gabès, 6072, Tunisia
H.Jurgen von Bardeleben
Affiliation:
[email protected], CNRS Université Paris 6, INSP, 140, rue de Lourmel, Pa ris, 75015, France
Jean-Louis Cantin
Affiliation:
[email protected], Université Paris 6, Paris, 75015, France
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Abstract

Nanocrystalline transition metal (TM=Co, Mn, Ni, Fe) doped zinc oxide powders have been elaborated by a new protocol based on slow hydrolyse of zinc acetate dissolved in methanol and supercritical drying in ethyl alcohol. The powders have a narrow size distribution with an average value of ∼ 25nm. Electron microscopy characterization showed that the size of the ZnO:TM particles did not change significantly for the different dopants. High doping levels of up to [TM] =0.25 have been investigated. X-ray diffraction studies showed the formation of the ZnO wurtzite phase for all dopants but secondary phases are equally detected. High temperature ferromagnetism was observed for Ni and Co doped powders whereas Mn doped powders showed only antiferromagnetic interactions. EPR spectroscopy indicates that the magnetism is related to the presence of extrinsic phases.

Keywords

ferromagneticII-VIelectron spin resonance
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K10-16
Copyright
Copyright © Materials Research Society 2007

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