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CoFe₂O₄−TiO₂ and CoFe₂O₄−ZnO Thin Film Nanostructures Elaborated from Colloidal Chemistry and Atomic Layer Deposition

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Guylhaine Clavel*†‡, Catherine Marichy†, Marc-Georg Willinger†, Serge Ravaine§, David Zitoun‡

, and Nicola Pinna*†#

^† Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal

^‡ Institut Charles Gerhardt, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier, France

^§ Centre de Recherche Paul Pascal (UPR 8641, CNRS), 115 avenue du docteur Albert Schweitzer, F-33600 Pessac, France

Department of Chemistry and Bar Ilan Institute for Nanotechnology, Bar Ilan University, Ramat Gan, Israel

^# World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul 151-744, Korea

Langmuir, 2010, 26 (23), pp 18400–18407

DOI: 10.1021/la103364y

Publication Date (Web): November 10, 2010

*To whom correspondence should be addressed. E-mail: clavel@ua.pt (G.C.), pinna@ua.pt (N.P.).

Section:

Surface Chemistry and Colloids

Abstract

CoFe₂O₄−TiO₂ and CoFe₂O₄−ZnO nanoparticles/film composites were prepared from directed assembly of colloidal CoFe₂O₄ in a Langmuir−Blodgett monolayer and atomic layer deposition (ALD) of an oxide (TiO₂ or ZnO). The combination of these two methods permits the use of well-defined nanoparticles from colloidal chemistry, their assembly on a large scale, and the control over the interface between a ferrimagnetic material (CoFe₂O₄) and a semiconductor (TiO₂ or ZnO). Using this approach, architectures can be assembled with a precise control from the Angstrom scale (ALD) to the micrometer scale (Langmuir−Blodgett film). The resulting heterostructures present well-calibrated thicknesses. Electron microscopy and magnetic measurement studies give evidence that the size of the nanoparticles and their intrinsic magnetic properties are not altered by the various steps involved in the synthesis process. Therefore, the approach is suitable to obtain a layered composite with a quasi-monodisperse layer of ferrimagnetic nanoparticles embedded in an ultrathin film of semiconducting material.

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History

Published In Issue December 07, 2010
Article ASAPNovember 10, 2010
Received: August 23, 2010
Revised: October 23, 2010

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CoFe₂O₄−TiO₂ and CoFe₂O₄−ZnO Thin Film Nanostructures Elaborated from Colloidal Chemistry and Atomic Layer Deposition