摘要: 采用简单的化学镀方法, 在相对低的温度下制备了具有核-壳结构的SiC-Ni纳米复合颗粒. XRD和TEM分析结果表明,纳米Ni晶吸附在SiC颗粒表面, 可以形成一层连续且致密的Ni包覆层. 基于化学镀和催化理论, 初步分析了化学镀核壳结构形成机理. 利用波导法研究了纳米SiC颗粒和复合颗粒在8～12GHz的微波介电特性. 研究结果表明, 复合颗粒的介电常数实部(ε')和介电损耗角正切值(tanδ=ε''/ε')都明显增强, 并给出相应的理论模型.
A nanoscale core-shell structure of β-SiC P-Ni was prepared at lower temperature by a simple and convenient electroless plating approach. The core-shell nanoparticles were characterized by means of XRD and TEM. The results show that β-SiC nanoparticles (β-SiC P) are coated by a uniform and continuous nickel
shell. The mechanism based on the theory of electroless plating and palladium
catalysis was discussed in details about core-shell structure of β-SiC P-Ni. Dielectric permittivities of the original silicon carbide nanoparticles (β-SiC P) and nickel-coated β-SiC P in paraffin wax were measured respectively in the GHz frequency range from 8 to 12GHz. The real part and dielectric loss tangent of the nickel-coated β-SiC P were significantly enhanced. The origin of the enhancement was discussed in theory, and also explained by discussing the change of surface electrical conduction behavior of β-SiC P and nickel-coated β-SiC P.
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