Preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions

The invention relates to a preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions, which belongs to a preparation method of nanoparticles with magneto-optical double functions. The magneto-optical double functional nanoparticles prepared in the prior art has the defects of unstable optical property and easy quenching of fluorescence of luminants. The preparation method comprises the following steps: preparing a manganese acetylacetonate precursor; preparing oil soluble trimanganese tetroxide nanoparticles with surfaces having oleyl amine for coordination; preparing cyclohexane solution; preparing water soluble trimanganese tetroxide nanoparticles coated by silicon dioxide, wherein the surfaces of the water soluble trimanganese tetroxide nanoparticles have a great deal of amino groups; and preparing water soluble trimanganese tetroxide nanoparticles with the magneto-optical double functions. The invention has the advantages that the nanoparticles have stable magnetism,