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Journal articles
Unraveling the Role of Alkali Cations in the Growth Mechanism of Gd2O2S Nanoparticles
Abstract : 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.
Cited literature [29 references]
https://hal-cea.archives-ouvertes.fr/cea-02440126
Contributor : Serge Palacin <>
Submitted on : Wednesday, January 15, 2020 - 7:08:43 AM
Last modification on : Wednesday, September 23, 2020 - 4:33:18 AM
Long-term archiving on: : Thursday, April 16, 2020 - 1:41:05 PM
Contributor : Serge Palacin <>
Submitted on : Wednesday, January 15, 2020 - 7:08:43 AM
Last modification on : Wednesday, September 23, 2020 - 4:33:18 AM
Long-term archiving on: : Thursday, April 16, 2020 - 1:41:05 PM
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Carriere_ChemMater2020_V0.pdf
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