Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 8, Pages 1430-1435Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm303344z
Keywords
maghemite; nanoparticles; ferrites; octanoic acid; TEM; Mossbauer spectroscopy
Funding
- State Research Unit NanoKat
- FH-Uni research college MAGNENZ
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Extremely small, monodisperse, and spheric maghemite (gamma-Fe2O3, 2-3 nm) and manganese (4-7 nm), cobalt (3-5 nm), and zinc ferrite (5-7 nm) nanocrystals are directly accessible on a large scale starting from inexpensive metal powders and octanoic acid by thermolysis in a high-boiling solvent. Bigger particle size is obtainable by prolonged reaction time according to the Ostwald ripening principle. The superparamagnetic nanocrystals and their assembly have been characterized by transmission electron microscopy, powder X-ray diffraction, Mossbauer spectroscopy, magnetic measurements, and energy-dispersive X-ray spectroscopy.
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