聚苯胺/铁氧体复合颗粒的合成与表征

Synthesis and characterization of the composites Of polyaniline with ferrite nano-particles

采用原位复合法制备导电聚苯胺磁性复合颗粒,借助FTIR、XRD、UV-Vis、TEM和VSM等分析手段研究了复合粒子的形貌、结构及其光、电和磁性能.结果表明:BaFe8(Ti0.5Mn0.5)4O19以约12nm的粒径分散在聚苯胺基体中,聚苯胺与铁氧体之间存在化学键合作用,一定程度上减小了铁氧体纳米粒子的团聚;PANI/BaFe8(Ti0.5Mn0.5)4O19复合颗粒同时具有导电性和磁性能,其导电性随聚苯胺含量的增加而增强,而比饱和磁化强度随之下降;当聚苯胺含量为54.91%时,复合颗粒电磁学性能为Hc=92kA/m,σs=11.54Am2/kg,σr=4.97Am2/kg,σ=13.1S/m.

Conducting polyaniline composites with magnetic nano-particles have been prepared by in situ composite technique in the presence of substituted Ti-Mn-Barium Ferrite Nano-particles synthesized by coprecipitation-melted salt method. The conformation, structure, optical properties and electromagnetic properties of PANI/BaFe8 ( Ti0.5 5 Mn0.5 )4O19 nanocomposites particles are characterized by FTIR, XRD, UV-Vis, TEM and VSM. The results indicate that the BaFe8 (Ti0.5Mn0.5)4O19 nanoparticles with diameter of about 12nm are dispersed in polyaniline. There exist chemical bonds between PANI and BaFe8(Ti0.5Mn0.5 )4O19 in PANI/BaFe8 (Ti0.5Mn0.5 )4O19 nanocomposites, at the same time, PANI can reduce the agglomeration of BaFe8( Ti0.5 Mn0.54O19 particles to some extent. The composites possess both conductivity and magnetization. With increasing PANI content, the conductivity of composites is increased, while the magnetization is reduced. When 45. 09% BaFe8 ( Ti0.5 Mn0.5 )4O19 is incorporated into PANI, the composites with Hc = 92 kA/m, σs = 11. 54 Am2/kg, σr=4. 97 Am2/kg, σ= 13. 1 S/m are obtained.