Hydrothermal Synthesis, Growth Mechanism and Magnetic Property of Fe3O4 Nanorod

• 1、College of Materials, Xiamen University

Abstract：In the present paper, rod-shaped Fe3O4 nanocrystals in the length of 200~300 nm have been prepared with a high yield using a simple poly (vinyl pyrrolidone) (PVP)-mediated hydrothermal synthesis method at a low temperature of 90 C. The formation mechanisms related to the chemical reaction, Fe3O4 nuclei and Fe3O4 rod-shaped crystal growth were discussed in detail. In the process of Fe3O4 nanocrystal growth, the Fe3O4 phase firstly appeared via dehydration of Fe (OH)2 and Fe(OH)3 under thermal treatment, then the Fe3O4 nuclei gradually grew into amorphous Fe3O4 nanoparticle. Finally, the spherical Fe3O4 nanoparticles transformed into Fe3O4 nanorods. Furthermore, magnetic characterization showed that the Fe3O4 nanorod exhibited an increasing sensibility of magnetic response than the spherical Fe3O4 nanoparticle. The as-prepared Fe3O4 nanorods can be quickly collected by an external magnet leaving a clear supernatant and such excellent magnetic response will have potential applications in the bioseparation and biodetection fields.

keywords： Nanocrystal Fe3O4 hydrothermal synthesis magnetic properties

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