High saturation magnetization Fe3O4 nanoparticles prepared by one-step reduction method in autoclave

Conformal magnetite nanoparticles are successfully prepared by one-step reduction method in the autoclave with controlled reduction conditions. The x-ray diffraction pattern indicates pure phase of Fe3O4 nanoparticles with high crystallinity were obtained. TEM analysis shows the presence of spherical nanoparticles with homogeneous size distribution of similar to 20 nm. The obtained Fe3O4 nanoparticles have high saturation magnetization Ms of 75.3 emu.g(-1). The inverse spinel Fe3O4 phase displays a distinct ferrimagnetic anisotropy. The Verwey metal-insulator transition of magnetite nanoparticles usually takes place at the blocking temperature of 120 K. The one-step reduction method in the autoclave of magnetite with well-controlled phase and high saturation magnetization in this work provides a promising opportunity for the synthesis of magnetic nano-materials to be used in wastewater treatment, catalyst, lithium-ion battery, contrast imaging, and especially in bio-applications. (C) 2017 Elsevier B.V. All rights reserved.