Preparation method and application of trimanganese tetroxide nano-radiography material with target function

The invention belongs to a nano-radiography material, in particular to a preparation method and application of trimanganese tetroxide nano-radiography material with target function. The current radiography material has the defects that tumour is detected through the magnetism performance of the material, the target function is not available, and the radiography material can not accurately enter tumour cells, therefore, normal tissues can not be distinguished from the tumour tissues. The preparation method of the trimanganese tetroxide nano-radiography material with the target function comprises the following steps: firstly, preparing monodisperse, water soluble and amino functionalized magnetic nano-material which has a trimanganese tetroxide/silicon dioxide core shell structure; secondly, quantificationally detecting the amount of amido on the surfaces of nanoparticles by using an amido density testing method; and thirdly, preparing the trimanganese tetroxide nano-radiography material with the target functio