循环伏安法制备十二烷基苯磺酸掺杂聚苯胺纳米纤维的聚合过程

Electrochemical Polymerization of Polyaniline Nanofiber Doped with Neopelex by Cyclic Voltammetry

采用循环伏安法在镀金聚对苯二甲酸乙二酯(PET)膜上聚合了十二烷基苯磺酸(DBSA)掺杂的聚苯胺(PANI)膜,对比研究了PANI聚合过程中不同时刻的循环伏安特性、微观形貌和交流阻抗特性。结果表明,在DBSA溶液中,PANI循环伏安法聚合过程可以分为工作电极表面异相成核、晶核径向生长和纤维横向生长3个阶段。在聚合初期,异相成核需要在一个较高的电位下进行,一旦成核,聚合可以通过晶核引发自催化成膜反应在较低的电位下迅速进行。为了获得性能较好的PANI膜,循环伏安法电位上限应大于0.8V。

Polyaline（PANI） film doped with dodecyl benzene sulfonic acid （DBSA） was synthesized by cyclic voltammetry on a gold-plated polyethylene terephthalate （PET） substrate. The cyclic voltammetry curves, micro characteristics and electrochemical impedance spectra of PANI polymerized at several certain times were analyzed. The results show that the polymerization process of PANI can be described as three stages, that is, heterogeneous nucleation on working electrode, radial growth of nucleation and lateral growth of fibers in DBSA solution. In the initial stage of polymerization, a higher electric potential is required to nucleate on a working electrode, after which, polymerization could proceed quickly in a lower electric potential by nucleation initiation autocatalytic film-forming reactions. To achieve a high performance PANI film, the upper limit of cyclic voltammetry potential should be above 0.8 V. With the polymerization time increasing, PANI film grows thicker and denser, which leads to a larger ion steric hindrance and poorer cyclic voltammetry performance.