Synthesis of nanocrystalline and nanostructured oxide materials by controlled precipitation in a polyol medium

M.A. Flores-González ^c1, M. Villanueva-Ibáñez ^c1, J. L. Díaz de León Santiago¹ , E. Palacios Beas², O. Tillement^c

¹ Centro de Investigaciones en NanoTecnología - Universidad Politécnica de Pachuca, Ex-Hacienda de Sta. Bárbara, 43830 Zempoala Hidalgo.

² Departamento de Ingeniería Metalúrgica, ESIQIE-IPN AP 118-616, 07051 México D.F.

^c Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard - Lyon1, UMR-CNRS 5620, 69622 Villeurbanne Cedex, France.

Recibido: 25 de mayo de 2006.
Aceptado: 3 de junio de 2006.

Abstract

A novel approach in utilizing the polyol method was used for the preparation of nanocrystalline and nanostructured undoped and Tb³⁺-doped Y₂O₃ materials. By this method, particles in colloidal solution and re-dispersible powders with spherical shape and luminescent properties were formed. The materials were characterised by High Resolution Transmission Electron Microscopy (HRTEM) and Luminescence Spectroscopy (LS). Oxide nanoparticles 5 to 6 nm in size, with homogeneous distribution, good morphology and high crystallinity were obtained, being colloidally stable for weeks. In the case of the re-dispersible powders, nanostructured aggregates 300 to 400 nm in size were observed, containing ultra-small individual nano-oxide bcc crystallites. In addition, the nanocrystalline and nanostructured Tb³⁺-doped Y₂O₃ materials showed luminescent properties.

Keywords: Nanocrystal; Nanostructured materials; Luminescence; Y₂O₃; Green emitting material.

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