导电聚苯胺与磁性CoFe2O4纳米复合物的合成及其电磁性能

在利用HNO3处理CoFe2O4磁性纳米粒子使其表面离子化、分散性得到改善的基础上, 采用苯胺在其表面原位聚合, 制备了具有电磁功能的聚苯胺(PANI)/CoFe2O4纳米复合物. 借助TEM、XRD、FT-IR、四探针电导率仪和VSM(振动样品磁强计)等分析手段研究了复合物的形貌、结构及其电磁性能. 结果表明, CoFe2O4以25 nm左右的粒子分散于聚苯胺基体中, 被其完全包覆, CoFe2O4与PANI之间存在化学键合作用; 复合物同时具有电性能和磁性能, 其导电率随CoFe2O4含量增加而降低, 饱和磁化强度随之升高, 而矫顽力在所研究的范围内则先增大而后又减小, 且均高于CoFe2O4的矫顽力.

Synthesis and Electromagnetic Properties of Polyaniline/CoFe2O4 Nanocomposite

CoFe2O4magnetic nanoparticles were dealt with nitric acid to forman ionization surface and to improve the dispersibility of CoFe2O4 nanoparticles greatly. Then polyaniline (PANI)/CoFe2O4 electromagnetic nanocomposites with different amounts of CoFe2O4 were synthesized by in-situ polymerization method. The morphologies, structures, and electromagnetic properties of the PANI/CoFe2O4 nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform-infrared (FT-IR) spectra, four-probe electrometer, and vibrating sample magnetometer (VSM). The results indicated that the CoFe2O4 magnetic nanoparticles with diameter of about 25 nm were dispersed in the base of PANI and the bonding interaction existed between CoFe2O4 particles and polyaniline in the composites. The composites possessed both conductivity and magnetism. With increasing CoFe2O4 content, the conductivity of the composites decreased while the saturated magnetization (Ms) increased. Increasing CoFe2O4 content from 16.8%to 69.2%, the coercive force (Hc) of PANI/CoFe2O4 nanocomposites was higher than that of the CoFe2O4 nanoparticles and increased firstly and then decreased.