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Synthesis of water dispersed Fe3O4@ZnO Composite Nanoparticles by the Polyol Method

Published online by Cambridge University Press:  13 July 2012

Yesusa Collantes ,
Oscar Perales-Perez ,
Oswald N. C. Uwakweh  and
J.-F.Guinel Maxime
Yesusa Collantes
Affiliation:
Department of Physics, University of Puerto Rico, Mayaguez, PR 00680 USA
Oscar Perales-Perez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR 00680 USA
Oswald N. C. Uwakweh
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR 00680 USA
J.-F.Guinel Maxime
Affiliation:
Department of Physics, University of Puerto Rico, San Juan, PR 00936-8377 USA
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Abstract

Water-soluble Fe3O4@ZnO composite nanoparticles (NPs) were synthesized using a polyol route. The effects of the addition of the ZnO phase were evaluated by varying the Zn/Fe molar ratio in the 0.25-1.00 range as a function of the reaction time. X-ray diffractometry confirmed the formation of the magnetite and ZnO phases and suggested the possible formation of a composite structure. Also, using this method, pure magnetite and ZnO NPs were synthesized. The average crystallite sizes were estimated to 6.3 ± 0.3 nm and 8.6 ± 0.6 nm for magnetite and ZnO NPs, respectively. The samples were examined using transmission electron microscopy. Fourier transform infrared spectra indicated the presence of adsorbed species onto the solids surface, which may explain the good stability of the materials in water. Photoluminescence measurements at room temperature for pure ZnO nanoparticles exhibited the characteristic excitonic emission around 395 nm. Vibrating Sample Magnetometer measurements at room temperature evidenced the superparamagnetic behavior of magnetite nanocrystals, with a saturation magnetization of 60emu/g. The maximum magnetization ranged from 28 to 54emu/g for the composite NPs. Mössbauer spectroscopy measurements at room temperature showed evidence of evolving Fe-sites associated to superparamagnetic particles, as reflected on the coexistence of prominent doublet peaks and very weak sextet peaks.

Keywords

nanostructureoptical propertiesmagnetic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1449: Symposium BB – Solution Synthesis of Inorganic Films and Nanostructured Materials , 2012 , mrss12-1449-bb06-23
Copyright
Copyright © Materials Research Society 2012

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