Size controlled and morphology tuned fabrication of Fe3O4 nanocrystals and their magnetic properties

Abstract Size controlled and morphology tuned fabrication of Fe 3 O 4 nanocrystals were achieved by a simple hydrothermal method using (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O, hexamethylenetetramine, and sodium sulfate as original reaction materials. Fe 3 O 4 particles with controlled size ranging from 160 nm to 2 μm were obtained by adding an appropriate amount of NH 4 Ac to the reaction system. Fe 3 O 4 quadrangular nanoplates with side length of about 500 nm were fabricated by adding optimum amount of urea. Box-like Fe 3 O 4 nanocrystals were synthesized by adjusting the mol ratio between (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and hexamethylenetetramine. The as-synthesized products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Room-temperature magnetization curves that measured by vibrating sample magnetometer show morphology and size dependent magnetism.

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