期刊
ACS APPLIED NANO MATERIALS
卷 3, 期 11, 页码 11587-11599出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02705
关键词
MgFe2O4; magnetic nanoparticles; photocatalysis; photoelectrochemistry; degree of inversion
资金
- German Research Foundation DFG [MA 5392/7-1, AP242/6-1, AP242/2-1, MA 5392/3-1]
- Fraunhofer Internal Programs [Attract 097-602175]
- Studienstiftung des deutschen Volkes
- AiF within the program for promoting the Industrial Collective Research (IGF) of the German Federal Ministry of Economic Affairs and Energy (BMWi) [18904N15]
- FCI
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 Mossbauer 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 (M-s) 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 M-s 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 d s 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.
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