导电、导磁聚苯胺纳米复合物的合成与表征

Preparation and Characterization of Conductive and Magnetic PANI Nano-Composite

在纳米Fe3 O4晶体粒子存在的情况下 ,用十二烷基苯磺酸钠 (SDBS)作乳化剂及分散剂 ,通过HCl调节体系的酸度 ,合成了导电、导磁的Fe3 O4 聚苯胺 (Fe3 O4 PANI)纳米复合物 ,用X -衍射 (XRD)、透射电子显微镜 (TEM)、傅立叶红外 (FT IR)等对该复合物进行了表征 ,结果显示 :SDBS与HCl发生竞争掺杂行为 ,复合物的组成为Fe3 O4 PANI DBSA ,Fe3 O4平均粒径约 13nm ,且均匀分布在聚苯胺基体中 ,该复合物具有较好的导电性及导磁性 ,随着纳米Fe3 O4含量由 7.79%增加到35 .34% ,复合物的电导率由 1.71S/m下降至 0 .4 1S/m ,复合物的比饱和磁化强度σs 则由 6 .14A·m2 /kg增加到 18.11A·m2 /kg ,其矫顽力在 0 .5 2～ 0 .73A/m之间 .

The Fe_3O_4-polyaniline(Fe_3O_4-PANI) nano-composites are synthesized via an in-situ polymerization of aniline monomer in SDBS-HCl aqueous solutions which contain well-dispersed Fe_3O_4 nanoparticles, SDBS serving as surfactant and dispersant. The composites are characterized by means of XRD, TEM, FT-IR, et al. The results show that competing doping behavior happened between SDBS and HCl during the process of synthesis. The component of the composite is Fe_3O_4-PANI-DBSA. Fe_3O_4 particles in it are almost spherical with average size of 13 nm and dispersed in the base of PANI regularly. These composites possess good electrical conductivity and magnetization. With the content of Fe_3O_4 increased from 7.79% to 35.34%, the conductivity of these composites gradually decreases from 1.71 S/m to 0.41 S/m, meanwhile the saturated magnetization (σ_s) increases from 6.14 A·m^2/kg to 18.11 A·m^2/kg, and the coercive force (Hc) is within the range of (0.52) A/m-(0.73 A/m).