Preparation and microwave absorption properties of Ni-B alloy-coated Fe3O4 particles

The Fe3O4 particles that were activated with Pd-Sn catalytic nuclei by single-step activation were used as cores Cor obtaining nickel- and boron-decorated particles with shell/core structure via electroless plating. The materials were characterized by TEM, SEM. EDX, X-ray diffraction, VSM and microwave network analyzer. The results showed that Fe3O4 particles coated with Ni-B alloy films had reduced metal deposition in the reaction solution. There was no peak of amorphous alloy Ni-B by XRD but the inverse spinal Fe3O4. The calculated results indicate that the Fe3O4 densely coated with Ni-B exhibits better absorption performance than the pure Fe3O4 in the range of 2-18 GHz, Such as more powerful absorbing capability and a wider electromagnetic wave absorbing frequency band. (C) 2007 Elsevier B.V. All rights reserved.