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Tailoring the Size, Inversion Parameter, and Absorption of Phase-Pure Magnetic MgFe2O4 Nanoparticles for Photocatalytic Degradations

Title data

Blößer, André ; Kurz, Hannah ; Timm, Jana ; Wittkamp, Florian ; Simon, Christopher ; Hayama, Shusaku ; Weber, Birgit ; Apfel, Ulf-Peter ; Marschall, Roland:
Tailoring the Size, Inversion Parameter, and Absorption of Phase-Pure Magnetic MgFe2O4 Nanoparticles for Photocatalytic Degradations.
In: ACS Applied Nano Materials. Vol. 3 (25 November 2020) Issue 11 . - pp. 11587-11599.
ISSN 2574-0970
DOI: https://doi.org/10.1021/acsanm.0c02705

Project information

Project financing: Bundesministerium für Wirtschaft und Technologie
Deutsche Forschungsgemeinschaft

Abstract in another language

Phase-pure magnesium ferrite (MgFe2O4) spinel nanocrystals are synthesized by a fast microwave-assisted route. The elemental composition is optimized via the ratio of the precursor mixture and controlled by energy-dispersive X-ray spectroscopy. Fine-tuning of the magnetic properties without changing the overall elemental composition is demonstrated by superconducting quantum interference device (SQUID) magnetometry and Mössbauer spectroscopy. Together with X-ray absorption spectroscopy and X-ray emission spectroscopy, we confirm that the degree of cation inversion is altered by thermal annealing. We can correlate the magnetic properties with both the nanosize influence and the degree of inversion. The resulting nonlinear course of saturation magnetization (Ms) in correlation with the particle diameter allows to decouple crystallite size and saturation magnetization, by this providing a parameter for the production of very small nanoparticles with high Ms with great potential for magnetic applications like ferrofluids or targeted drug delivery. Our results also suggest that the optical band gap of MgFe2O4 is considerably larger than the fundamental electronic band gap because of the d5 electronic configuration of the iron centers. The presented different electronic transitions contributing to the absorption of visible light are the explanation for the large dissent among the band gaps and band potentials found in the literature.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry III > Chair Physical Chemistry III - Univ.-Prof. Dr. Roland Marschall
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV > Chair Inorganic Chemistry IV - Univ.-Prof. Dr. Birgit Weber
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry III
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 10 Dec 2020 08:24
Last Modified: 17 Feb 2021 10:40
URI: https://eref.uni-bayreuth.de/id/eprint/60957