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Stabilization of Monodisperse, Phase-Pure MgFe 2 O 4 Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

DOI: 10.1021/acs.jpcc.7b08780 DOI Help

Authors: Kristin Kirchberg (Justus-Liebig-University Giessen) , Anna Becker (Justus-Liebig-University Giessen) , André Bloesser (Justus-Liebig-University Giessen) , Tobias Weller (Justus-Liebig-University Giessen) , Jana Timm (Justus-Liebig-University Giessen) , Christian Suchomski (Justus-Liebig-University Giessen) , Roland Marschall (Justus-Liebig-University Giessen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: November 2017

Abstract: Monodisperse, monocrystalline magnesium ferrite (MgFe2O4) nanoparticles were synthesized phase purely by fast nonaqueous microwave-assisted solution-phase synthesis. Colloidal stabilization of the nanocrystals in nonaqueous media was realized either in-situ during synthesis or postsynthetically by surface capping with oleylamine and oleic acid. Phase transfer to aqueous media was performed employing citric acid and betaine hydrochloride, resulting in agglomerate-free dispersions of citrate- or betaine-functionalized MgFe2O4 nanocrystals. Furthermore, a one-step synthesis of highly stable, water-dispersible colloids of MgFe2O4 was achieved using polyvinylpyrrolidone as stabilizer. Characterization of the as-synthesized and functionalized nanoparticles was performed employing X-ray diffraction, UV–vis and infrared spectroscopy, thermogravimetry, dynamic light scattering, and transmission electron microscopy. Special focus was laid on phase purity, which was thoroughly monitored using Raman microscopy/spectroscopy. Photocatalytic reactions were performed to evaluate the use of such highly stable ferrite colloids for solar energy conversion.

Subject Areas: Chemistry, Energy, Materials

Instruments: I15-Extreme Conditions