Abstract
Pure magnetite (Fe3O4) nanoparticles and carbon-coated magnetite (Fe3O4/C) nanocomposites were facilely synthesized in a hydrothermal reaction system by changing sodium hydroxide and sodium acetate as the precipitating agents, respectively. The sizes of pure Fe3O4 nanoparticles and Fe3O4/C nanocomposites with core–shell structure were varied from 10 to 120 nm, and the magnetic properties of these two samples performed as superparamagnetic and ferrimagnetic. A possible formation mechanism for these two types of magnetite nanomaterials was discussed. It was the different alkali environments provided by the precipitating agents that led to the varieties in morphology, structure, and property of the final magnetite nanomaterials.
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