DBSA含量对纳米Fe_3O_4/导电聚苯胺结构和电磁性能的影响

Effect of the Contents of DBSA on the Structures and Electromagnetic Properties of Fe_3O_4/Conductive Polyaniline Nanoparticles

以十二烷基苯磺酸(DBSA)为乳化剂和掺杂剂,过硫酸铵(APS)为氧化剂,采用乳液聚合的方法合成了导电聚苯胺包覆磁性四氧化三铁的核-壳纳米复合材料。通过TEM、FTIR、XRD、介电常数和磁导率的测量研究了反应中DBSA的含量对合成纳米颗粒的微观结构和电磁性能的影响。结果表明:当DBSA和苯胺的摩尔比为1.0时,得到的Fe3O4/PANI/DBSA微粒的粒径在120 nm左右,颗粒的分散状态较好;FTIR和XRD的表征说明,DBSA的加入量在很大程度上影响掺杂态聚苯胺的导电性和结晶性;介电常数和磁导率的测试结果表明,ε′和ε″都随着DBSA的增多而增大,但ε″增大到一定程度后则保持不变,μ′随DBSA的加入量的不同变化并不显著;μ″随DBSA加入量的增多则呈现波动性的变化。

Electrically conducting polyaniline （PANI）-magnetic oxide （Fe3O4 ） composites with electrical and ferromagnetic behaviors were synthesized by the way of emulsion polymerization using dodecyl benzene sulfonic acid （DBSA） as a surfactant and dopant, and ammonium persulfate （APS） as the oxidant. The microstructures and electromagnetic parameters of the composites were investigated by the TEM,FTIR, XRD ,permittivity and permeability measures. The results showed that the average diameter of the Fe3O4/PANI/DBSA nanocomposites is about 120 nm when the molar ratio of the DBSA to An is 1. O. The contents of DBSA have a great influence on the conductivity and crystallization. The real （ε＇） and imaginary （ε＂） part of permittivity are increased with the increase of DBSA and the is ε＂ invariable when it reaches some values. The real part of permeability （μ＇）is about constant with the different contents of DBSA and the imaginary part of permeability（μ＂） has a fluctuant change with the increment of DBSA. The different dissipative mechanisms were discussed to explain the varieties.