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Microwave synthesis of high-quality and uniform 4 nm ZnFe₂O₄ nanocrystals for application in energy storage and nanomagnetics

Suchomski, Christian; Breitung, Ben; Witte, Ralf; Knapp, Michael; Bauer, Sondes; Baumbach, Tilo; Reitz, Christian; Brezesinski, Torsten

Abstract (englisch): Magnetic nanocrystals with a narrow size distribution hold promise for many applications in different areas ranging from biomedicine to electronics and energy storage. Herein, the microwave-assisted sol–gel synthesis and thorough characterization of size-monodisperse zinc ferrite nanoparticles of spherical shape is reported. X-ray diffraction, 57Fe Mössbauer spectroscopy and X-ray photoelectron spectroscopy all show that the material is both chemically and phase-pure and adopts a partially inverted spinel structure with Fe3+ ions residing on tetrahedral and octahedral sites according to (Zn0.32Fe0.68)tet[Zn0.68Fe1.32]octO4±δ. Electron microscopy and direct-current magnetometry confirm the size uniformity of the nanocrystals, while frequency-dependent alternating-current magnetic susceptibility measurements indicate the presence of a superspin glass state with a freezing temperature of about 22 K. Furthermore, as demonstrated by galvanostatic charge–discharge tests and ex situ X-ray absorption near edge structure spectroscopy, the as-prepared zinc ferrite nanocrystals can be used as a high-capacity anode material for Li-ion batteries, showing little capacity fade – after activation – over hundreds of cycles. Overall, in addition to the good material characteristics, it is remarkable that the microwave-based synthetic route is simple, easily reproducible and scalable.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.3762/bjnano.7.126
ISSN: 2190-4286
URN: urn:nbn:de:swb:90-604335
KITopen ID: 1000060433
HGF-Programm 37.01.01; LK 01
Erschienen in Beilstein journal of nanotechnology
Band 7
Seiten 1350-1360
Schlagworte 1-phenylethanol route, lithium-ion battery, nanomagnetism, nanoparticles, nonaqueous sol–gel synthesis, zinc ferrite
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