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-SiCp-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-SiCp） 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-SiCp-Ni. Dielectric permittivities of the original silicon carbide nanoparticles （β-SiCp） and nickel-coated β-SiCp 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-SiCp 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-SiCp and nickel-coated βSiCp.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期797-802,共6页
Journal of Inorganic Materials
基金
科技部863资助课题(2002AA305509)
国家自然科学基金(50572010)
教育部博士基金(2004007021)
黑龙江省自然科学基金(E2004-20)
关键词
化学镀
SIC
SiC—Ni核壳结构
介电性能
electroless plating
SiC
core-shell structure of silicon carbide and nickel
dielectric property
