A two-step method synthesis and microwave absorption properties of double-shell Ni@/BN@BaTiO3 nanocapsules

BN@BaTiO3 coated Ni nanocapsules were prepared by a two-step method, composed of an arc-discharge and a chemical liquid deposition process. Their microstructure, surface component as well as electromagnetic properties(1-18GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray diffraction, FTIR spectra (FT-IR) and a network analyzer, respectively. The core double-shell Ni@/BN@BaTiO3 nanocapsules exhibit stronger EM absorption properties and the position of absorb peaks move to the low frequency direction in GHz range in the same thickness, compared to that of Ni@/BN. The microwave absorptive mechanisms of BN@BaTiO3 coated Ni nanocapsule absorbent were discussed.