Synthesis of manganese spinel nanoparticles at room temperature by coprecipitation

Fabien Giovannelli (1) , Cecile Autret (1) , Catherine Mathieu (1) , Tatiana Chartier (1) , Fabian Delorme (1) , Alain Seron (2)

1 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

This paper is focused on a new route to synthesize Mn3O4 nanoparticles by alkalisation by sodium hydroxide on a manganeous solution at room temperature. The precipitates obtained at different pH values have been characterized by XRD and TEM. Since the first addition of sodium hydroxide, a white Mn(OH)2 precipitate appears. At pH=7, γ-MnOOH phase is predominant with needle like shaped particles. At pH=10, hausmanite nanoparticles, which exhibits well defined cubic shape in the range 50-120 nm are obtained. This new precipitation route is a fast and easy environmentally friendly process to obtain well crystallized hausmanite nanoparticles.

Keywords: Nanoparticles; Precipitation; Hausmanite

Domains: Material chemistry

Fabien Giovannelli, Cecile Autret, Catherine Mathieu, Tatiana Chartier, Fabian Delorme, et al.. Synthesis of manganese spinel nanoparticles at room temperature by coprecipitation. Journal of Solid State Chemistry, 2012, 192, pp.109-112. ⟨10.1016/j.jssc.2012.04.006⟩. ⟨hal-00824358⟩