Template-free synthesis of hollow α-Fe₂O₃ microspheres

摘要

Nearly monodisperse hollow α-Fe₂O₃ microspheres composed of nanoparticles have been successfully synthesized through a facile template-free hydrothermal method. The products were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is shown that the hollow α-Fe₂O₃ microspheres consist of well-aligned α-Fe₂O₃ nanoparticles with a mean diameter of about 15 nm. This facile reaction route presents an efficient method for mass production of monodisperse hollow magnetic nanomaterials. The final α-Fe₂O₃ microspheres exhibit special magnetic properties with a small remnant magnetization of 0.09 emu g−1 and a high coercivity of 1121.67 Oe at room temperature.