We report a facile synthesis of polypyrrole/silver-coated granular microsphere composite films through electropolymerization process in the presence of low- and high-density conductive granular microspheres. The resulting morphologies of composite films were implicitly influenced by the density of microspheres as revealed by scanning electron microscopy (SEM). Energy-dispersive X-ray (EDX) analysis confirmed the existence of elemental composition of the polypyrrole and conductive microspheres, while Fourier transform infrared (FTIR) spectroscopy verified the presence of molecular bonding associated with the dopant anion in all the synthesized films. Resistivity measurements demonstrated enhanced nonlinear conductivity and a strong dependence of current density in composite films with increasing application of electric field. Improvement in nonlinear conductivities is linked to the formation of more effective conductive pathways that boosted intermolecular and inter-particle charge carrier migration. Tensile tests reveal that the conductive granular microspheres have the general tendency to decrease internal forces in composite films.

Graphical Abstract

中文翻译：

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电聚合聚吡咯/银包覆颗粒微球复合膜的形貌，电导率和力学性能

我们报告了在低密度和高密度导电颗粒微球存在下，通过电聚合过程轻松合成聚吡咯/银包覆的颗粒微球复合膜。如通过扫描电子显微镜（SEM）所揭示的，复合膜的最终形貌隐含地受到微球密度的影响。能量色散X射线（EDX）分析证实了聚吡咯和导电微球的元素组成存在，而傅立叶变换红外（FTIR）光谱证实了在所有合成膜中均存在与掺杂剂阴离子相关的分子键。电阻率测量结果表明，随着电场的增加，复合膜中的非线性电导率增强，并且电流密度具有很强的依赖性。非线性电导率的提高与更有效的导电路径的形成有关，从而促进了分子间和粒子间电荷载流子的迁移。拉伸试验表明，导电颗粒微球具有降低复合膜内力的总体趋势。

图形概要