Letter abstract
Nature Materials 3, 787 - 792 (2004)
Published online: 24 October 2004 | doi:10.1038/nmat1206
Subject Categories: Porous materials | Surface and thin films | Design synthesis and processing
Periodically ordered nanoscale islands and mesoporous films composed of nanocrystalline multimetallic oxides
David Grosso1, Cédric Boissière1, Bernd Smarsly2, Torsten Brezesinski2, Nicola Pinna2, Pierre A. Albouy3, Heinz Amenitsch4, Markus Antonietti2 & Clément Sanchez1
Innovative strategies to produce well-defined nanoparticles and other nanostructures such as nanofibres, quantum wells and mesoporous materials have revitalized materials science1, 2 for the potential benefit to society. Here, we report a controlled process, involving soft-chemistry-based deposition, template-assisted mesostructured growth, and tuned annealing conditions that allows the preparation of ordered mesoporous crystalline networks and mesostructured nano-island single layers, composed of multicationic metal oxides having perovskite, tetragonal or ilmenite structures. This strategy to obtain meso-organized multi-metal-oxide nanocrystalline films (M3NF) bridges the gap between conventional mesoporous materials and the remarkable properties of crystalline ternary or quaternary metallic oxides. Nanocrystalline mesoporous films with controlled wall thickness (10–20 nm) of dielectric SrTiO3, photoactive MgTa2O6 or ferromagnetic semi-conducting CoxTi1-xO2-x were prepared by evaporation-induced self-assembly (EISA) using a specially designed non-ionic block-copolymer template. A tuned thermal treatment of the mesoporous films permits the transfer of the wall structure into nanocrystallites, with all tectonic units being tightly incorporated into mechanically stable ordered tri- or bidimensional nanocrystalline networks. This methodology should allow multifunctionalization, miniaturization and integration during development of devices such as smart sensors and actuators, better-performing photocatalysts, and fast electrochromic devices. On the other hand, organized arrays of dispersed ferromagnetic or ferroelectric nanoparticles are promising materials for spintronics and for cheap, non-volatile 'flash' memories.
- Chimie de la Matière Condensée, UMR UPMC-CNRS 7574, 4 place Jussieu, 75252 Paris 05, France
- Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany
- Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay, France
- Institute of Biophysics and X-ray Structure Research, Austrian Academy of Sciences, Steyrergasse 17/VI, 8010 Graz, Austria
Correspondence to: Clément Sanchez1 e-mail: clems@ccr.jussieu.fr
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