Abstract: Single-crystal Fe_3O_4 nanorods and quantum dots were synthesized by LSS method using FeSO_4·7H_2O as iron source. Because of the different morphology under the different reaction conditions, the reaction mechanism were extrapolated according to the morphology of products prepared at different reaction conditions. The as-prepared Fe_3O_4 samples were characterized by X-ray powder diffraction (XRD) and transmission electron microscope(TEM). The hysteresis curve of the synthesized Fe_3O_4 nanorods and quantum dots were measured at room temperature. The results showed that the magnetic susceptibilities (Ms) of the nanorods and quantum dots were 44.26 emu/g and 60.09 emu/g, and the coercive forces (H_c) were 132.3 Oe and 143.2 Oe.

Key words: Single-crystal Fe_3O_4 nanorods and quantum dots were synthesized by LSS method using FeSO_4·7H_2O as iron source. Because of the different morphology under the different reaction conditions, the reaction mechanism were extrapolated according to the morphology of products prepared at different reaction conditions. The as-prepared Fe_3O_4 samples were characterized by X-ray powder diffraction (XRD) and transmission electron microscope(TEM). The hysteresis curve of the synthesized Fe_3O_4 nanorods and quantum dots were measured at room temperature. The results showed that the magnetic susceptibilities (Ms) of the nanorods and quantum dots were 44.26 emu/g and 60.09 emu/g, and the coercive forces (H_c) were 132.3 Oe and 143.2 Oe.