Synthesis and Characterization of Hollow Magnetic Alloy (GdNi_2, Co_5Gd) Nanospheres Coated with Gd_2O_3

摘要

Uniform magnetic hollow nanospheres (GdNi_2, Co_5Gd) coated with Gd_2O_3 have been successfully prepared on a large scale via a urea-based homogeneous precipitation method using silica (SiO_2) spheres as sacrificed templates, followed by subsequent heat treatment. Nitrogen sorption measurements and scanning electron microscope reveal that these hollow-structured magnetic nanospheres have the mesoporous shells that are composed of a large amount of uniformnanoparticles. After reduction treatment, these nanoparticles exhibit superparamagnetism that might have potential applications in medicine. Furthermore, the developed synthesis route may provide an important guidance for the preparation of other multifunctional hollow spherical materials.