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以对甲苯磺酸(PTSA)为掺杂剂、碳纳米管(CNTs)为增强相通过电化学恒电位法在不锈钢电极表面合成聚吡咯/碳纳米管(PPy/CNTs)复合膜。采用扫描电镜(SEM)和四探针测试仪对PPy/CNTs膜的微观形貌和电导率进行表征。通过交流阻抗谱(EIS)、循环伏安法(CV)研究了PPy/CNTs膜的电化学行为。系统研究了聚合电位、聚合时间、PTSA浓度、CNTs浓度以及吡咯(Py)浓度对PPy/CNTs膜的形貌、厚度以及电导率的影响。结果表明:在0.60～0.90V聚合电位之间PPy/CNTs膜成膜性好且容易从不锈钢电极表面剥离。聚合电位、聚合时间对PPy/CNTs膜的厚度、形貌和电导率均有较大影响,当Py∶PTSA∶CNTs为1.57∶1.97∶1.41,聚合电位为0.75V,聚合时间为1000s时,合成的PPy/CNTs膜电导率最高为33.14S.cm-1。
The polypyrrole / carbon nanotubes (PPy / CNTs) composite films were synthesized on the surface of stainless steel by electrochemical potentiostatic method using p-toluenesulfonic acid (PTSA) as dopant and carbon nanotubes (CNTs) as reinforcing phases. The morphology and electrical conductivity of PPy / CNTs films were characterized by scanning electron microscopy (SEM) and four-probe tester. The electrochemical behavior of PPy / CNTs films was investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The effects of polymerization potential, polymerization time, PTSA concentration, CNTs concentration and pyrrole concentration on the morphology, thickness and conductivity of PPy / CNTs films were systematically investigated. The results show that PPy / CNTs films have good film-forming property and easily peel off from the stainless steel electrode surface at the polymerization potential of 0.60 ~ 0.90V. Polymerization potential and polymerization time have great influence on the thickness, morphology and conductivity of PPy / CNTs films. When the ratio of Py:PTSA:CNTs is 1.57:1.97:1.41, the polymerization potential is 0.75V and the polymerization time is 1000s, PPy / CNTs membrane conductivity of the highest 33.14S.cm-1.