Letter abstract
Nature Materials 4, 750 - 753 (2005)
Published online: 11 September 2005 | doi:10.1038/nmat1480
Subject Categories: Magnetic materials | Nanoscale materials
Multimillimetre-large superlattices of air-stable iron–cobalt nanoparticles
Céline Desvaux1,2, Catherine Amiens1, Peter Fejes3, Philippe Renaud2, Marc Respaud4, Pierre Lecante5, Etienne Snoeck5 & Bruno Chaudret1
Self-organization of nanoparticles into two- and three-dimensional superlattices on a large scale is required for their implementation into nano- or microelectronic devices1, 2. This is achieved, generally after a size-selection process3, 4, through spontaneous self-organization on a surface5, 6, 7, 8, 9, 10, 11, layer-by-layer deposition12 or the three-layer technique of oversaturation3, 14, but these techniques consider superlattices of limited size. An alternative method developed in our group involves the direct formation in solution of crystalline superlattices, for example of tin nanospheres, iron nanocubes or cobalt nanorods, but these are also of limited size15, 16, 17. Here, we report the first direct preparation in solution of multimillimetre-sized three-dimensional compact superlattices of nanoparticles. The 15-nm monodisperse FeCo particles adopt an unusual short-range atomic order that transforms into body-centred-cubic on annealing at 500 °C. The latter process produces an air-stable material with magnetic properties suitable for radiofrequency applications.
- Laboratoire de Chimie de Coordination du CNRS, 205, route de Narbonne, 31077 Toulouse Cedex 04, France
- Freescale Semiconductor, le Mirail BP 1029, 31023 Toulouse Cedex, France
- Freescale Semiconductor, Inc., 2100 E. Elliot Road, Tempe, Arizona-85824, USA
- Laboratoire de la Physique de la Matière Condensée, INSA, 135 avenue de Rangueil, 31077 Toulouse, France
- Centre d'Elaboration des Matériaux et d'Etude Structurale, 29, rue Jeanne Marvig, BP94347, 31055 Toulouse Cedex 04, France
Correspondence to: Bruno Chaudret1 e-mail: chaudret@lcc-toulouse.fr
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