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.

Department of Chemical and Geological Sciences University of Cagliari S S 554 bivio per Sestu 09042 Monserrato Cagliari Italy

Department of Inorganic Chemistry Charles University of Prague Prague 116 36 Czech Republic

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