Ding Xuefeng, Han Dongxue, Wang Zhijuan, Xu Xiaoyu, Niu Li, Zhang Qiang
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
J Colloid Interface Sci. 2008 Apr 1;320(1):341-5. doi: 10.1016/j.jcis.2008.01.004. Epub 2008 Jan 10.
Polyaniline/magnetite nanocomposites consisting of polyaniline (PANI) nanorods surrounded by magnetite nanoparticles were prepared via an in situ self-assembly process in the presence of PANI nanorods. The synthesis is based on the well-known chemical oxidative polymerization of aniline in an acidic environment, with ammonium persulfate (APS) as the oxidant. An organic acid (dodecylbenzenesulfonic acid, DBSA) was used to replace the conventional strong acidic (1 M HCl) environment. Here, dodecylbenzenesulfonic acid is used not only as dopant, but also as surfactant in our reaction system. So, DBSA can excellently control the morphology and size of PANI nanorods and magnetite particles. Magnetite particles were formed simultaneously during sedimentation, and the formed nanorods were also decorated by the particles. The resulting PANI/magnetite composites were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It is found that PANI/magnetite nanorod composites have uniform size, superparamagnetism and a small mass fraction of magnetite, thermal stabilization even at a higher temperature.
由被磁铁矿纳米颗粒包围的聚苯胺（PANI）纳米棒组成的聚苯胺/磁铁矿纳米复合材料是在聚苯胺纳米棒存在的情况下通过原位自组装过程制备的。该合成基于在酸性环境中以过硫酸铵（APS）为氧化剂的苯胺的著名化学氧化聚合反应。使用有机酸（十二烷基苯磺酸，DBSA）来替代传统的强酸性（1 M HCl）环境。在这里，十二烷基苯磺酸不仅用作掺杂剂，还用作我们反应体系中的表面活性剂。因此，DBSA能够出色地控制聚苯胺纳米棒和磁铁矿颗粒的形态和尺寸。磁铁矿颗粒在沉淀过程中同时形成，并且形成的纳米棒也被这些颗粒修饰。使用扫描电子显微镜（SEM）、X射线衍射（XRD）和热重分析（TGA）对所得的聚苯胺/磁铁矿复合材料进行了表征。发现聚苯胺/磁铁矿纳米棒复合材料具有均匀的尺寸、超顺磁性以及少量的磁铁矿质量分数，甚至在较高温度下也具有热稳定性。
