Magnetic nano chain with monodispersity and broadband microwave absorption as well as preparation method and application of magnetic nano chain

The invention belongs to the technical field of nano composite materials, and particularly relates to a magnetic nano chain with monodispersity and broadband microwave absorption. The preparation method comprises the following steps: firstly, coating a layer of surfactant on the surfaces of magnetic inorganic nano-particles to inhibit agglomeration among the particles; and depositing an amorphous tin dioxide layer on the precursor by adding an organic tin source with a carboxyl functional group on the basis of a sol-gel chemical principle. In the process, a core-shell structure Fe3O4 (at) SnO2/PVP nano chain with excellent monodispersity is obtained in a carboxyl-containing environment (repulsion among particles is increased) by utilizing the directional induction effect of an external magnetic field; the nano chain has high specific surface area, good magnetic responsiveness and excellent monodispersity, and the problem of agglomeration of the current magnetic nano chain is effectively solved. In addition, t