Oleate-Based Solvothermal Approach for Size Control of M(II)Fe₂(III)O₄ (M(II) ═ Mn(II), Fe(II)) Colloidal Nanoparticles
2019
Abstract
The versatility of a promising and repeatable oleate-based solvothermal approach has been explored through the synthesis of MnFe2O4 and λ-Fe2O3/Fe3O4 nanoparticles in form of colloidal dispersions and the tuning of the particle and crystallite sizes. Spinel ferrite nanoparticles with controlled-size in the range 7-14 nm with dispersity below 15% was reached for both MnFe2O4 and λ-Fe2O3/Fe3O4.
The size-tuning was obtained with three different pathways: (I) direct approach by changing the solvent polarity or the precursor concentration; (II) post-synthesis solvothermal treatment in the presence of metal oleates; (III) post-synthesis solvothermal treatment in the absence of metal oleates.