Unraveling the Role of Alkali Cations in the Growth Mechanism of Gd₂O₂S Nanoparticles

Clément Larquet (1) , David Carriere (2) , Anh-Minh Nguyen (1) , Thi Kim-Chi Le (1) , Xavier Frogneux-Plé (1) , Isabelle Génois (3) , Patrick Le Griel (3) , Andrea Gauzzi (4) , Clément Sanchez (1, 3) , Sophie Carenco (1)

1 LCMCP-NANO - Novel Advanced Nano-Objects
2 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
3 Chaire Chimie des matériaux hybrides
4 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie

Alkali cations are required for the colloidal synthesis of Ln$_2$O$_2$S nanoplates in organic solvent. Based on a thorough experimental analysis using various lanthanides and three alkali ions, we challenge the commonly accepted scenario of partial lanthanide substitution by the alkali, which is supposed to favor the sulfide insertion over the oxide one. Using SAXS-WAXS on aliquots taken from the synthesis medium, we demonstrate the formation of an alkali-stabilized oleate mesophase acting as a template for nanoparticles nucleation and growth. As a consequence, the alkali is not incorporated into the crystalline structure; nanoparticle growth requires only a low alkali concentration that can be readily washed away from the final nanoparticles powder. We expect that similar mesophases may form in other colloidal synthesis using oleates and small cations.

Domains: Chemical Sciences; Material chemistry

Clément Larquet, David Carriere, Anh-Minh Nguyen, Thi Kim-Chi Le, Xavier Frogneux-Plé, et al.. Unraveling the Role of Alkali Cations in the Growth Mechanism of Gd₂O₂S Nanoparticles. Chemistry of Materials, In press, 32, pp.1131-1139. ⟨10.1021/acs.chemmater.9b04059⟩. ⟨cea-02440126⟩