原位复合聚苯胺/钛酸钡纳米粒子表征

Characterization of in situ Synthesizing Polyaniline/Barium Titanate Nanocomposites

采用原位复合方法制备出聚苯胺 /钛酸钡纳米复合粒子 ,借助 IR,TEM,TG和 DTA等分析手段研究其复合过程及获得的复合粒子的性能。结果表明 :其聚苯胺形成过程与单独的苯胺氧化聚合过程类似 ;复合粒子的粒径为 2～ 3μm,钛酸钡以 5～ 10 nm晶粒分散于聚苯胺基之中 ,钛酸钡与聚苯胺的质量比为 0 .91,聚苯胺的热稳定性提高 6 0℃以上 ;复合粒子的电导率在 10 0 ～ 10 - 1 1 S/cm之间可通过掺杂或反掺杂调节。

Polyaniline barium titanate(PAn BaTiO 3) nanocomposite particles have been prepared in situ The PAn BaTiO 3 nanocomposites particles were characterized with IR, SEM, TG and DTA etc The results show that the process of polyaniline is similar as by the oxidative polymerization of aniline with H 2O 2 in 1M HCl solution, and the surfaces of BaTiO 3 nanoparticles which are 5～10nm in diameter are completely coated by polyaniline, while the average diameter of the particles is less than 2～3μm PAn BaTiO 3 nanocomposites (when the ratio of BaTiO 3 to PAn is 0 91) have a thermally stable temperature of more than 540℃, well above 60℃ higher than PAn particles The conductivity of PAn BaTiO 3 nanocomposite particles is transformable from 10 0 to 10 -11 S/cm by dedoping(or doping) them with various concentrated NaOH, ammonia water or HCl solutions using an equilibrium method