导电聚苯胺/TiO_2复合纳米纤维的制备和表征

Synthesis and characterization of conductive polyaniline/TiO_2 composite nanofibers

在无模板条件下，利用苯胺在纳米TiO2微粒表面的原位化学氧化聚合，成功制备了一系列不同TiO2含量的导电聚苯胺／TiO3（PANI／TiO3）纳米复合材料．通过TEM，XRD，FT-IR，TG-DTA及电导率测量等技术手段对其进行了表征．结果表明：复合材料的形貌呈纤维状，直径约20～40nm，长度在390～420nm范围；其中TiO2的含量为23．8％且具有金红石矿结构，聚苯胺也有一定程度的晶化；在复合材料中，TiO2和聚苯胺分子链之间存在强的相互作用，并对复合材料的热稳定性起促进作用；TiO2的含量对复合材料导电性能有显著影响，当TiO3含量为11．1％时电导率达到极大值2．86 S／cm．

Fibrillar conductive polyaniline/TiO2 （PANI/TiO2） nanocomposites with different TiO2 amount are synthesized by template-free in-situ polymerization method, and they are characterized by TEM,XRD, FT-IR spectra and conductivity measurement. Morphology of the composite PANI/TiO2 （23.8%） is relatively uniform nanofibers with the diameters and lengths in the range of 20-40 nm and 390-420 nm, respectively. The TiO2 nanoparticles in the composite are rutile crystalline form and PANI have also some degree of crystallinity. The spectra analyses indicate that a strong interaction existes between PANI and TiO2 nanoparticles, and has a beneficial effect on the thermal stability of nanofibers in air. The conductivity of PANI/TiO2 composites increases with the increase of TiO2 amount, and has an optimum value 2.86 S/cm when the TiO2 content is about 11.1 0%.