化学镀制备Ni包覆纳米SiC核壳颗粒及其介电响应

nanoscale core-shell structure of β-SiCP-Ni has been prepared at lower temperature by a simple and convenient electroless plating approach. The core-shell nanoparticles have been characterized by means of XRD and TEM. The results show that β-SiC nanoparticles (β-SiCP) are coated by a uniform and continuous nickel shell. The mechanism based on the theory of electroless plating and palladium catalysis has been discussed in details about core-shell structure of β-SiCP-Ni. Dielectric permittivities of the original silicon carbide nanoparticles (β-SiCP) and nickel-coatedβ-SiCP in paraffin wax were measured respectively in the GHz frequency range from 8 to 12 GHz. The real part and dielectric loss tangent of the nickel-coatedβ-SiCP were significantly enhanced. The origin of the enhancement is discussed in theory, and also explained by discussing the change of surface electrical conduction behavior of β-SiCP and nickel-coated β-SiCP.