Shape-controlled synthesis of Fe_3O_4 rhombic dodecahedrons and nanodiscs

摘要

Fe_3O_4 rhombic dodecahedrons with only {110} facets exposed and nanodiscs bounded entirely by {111} facets were fabricated via a one-pot hydrothermal approach. The morphologies, structures and magnetic properties of the rhombic dodecahedrons and nanodiscs were investigated through different analytical tools. Batch experiments indicated that the reaction temperature and amount of N_2H_4·H_2O play important roles in determining the sizes and morphologies of the products. Magnetic analysis revealed that the magnetic properties are closely related to the morphologies of the magnetites. The synthesized Fe_3O_4 nanocrystals are hoped to have important applications in advanced magnetic materials and catalytic fields.