Shape-controlled synthesis of Fe₃O₄ nanocrystals with incontinuous multicavities

Abstract

In the solvothermal synthesis process, the effect of NaOH dosages of from 0.3 g to 4.0 g on the morphology evolution(from nanoparticles to octahedra) of Fe₃O₄ crystals was carefully investigated. Meanwhile, the growth process of Fe₃O₄ crystals at different reaction time was also investigated. Furthermore, it has been found that the particle size and crystallinity of Fe₃O₄ crystals can be controlled by the dosages of NaOH. In this paper, the increases of both the reaction time and the NaOH concentrations correspond to a minimization process of surface energy for Fe₃O₄ crystals. During the synthesis process, the addition of N₂H₄·H₂O and ethylene glycol in the magnetite not only facilitated the narrow distribution of particle size but also contributed to the formation of incontinuous multicavities with a diameter of about 5 nm.

Keywords

Fe₃O₄ nanocrystal / Incontinuous multicavity / Magnetic property

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