Abstract

In this work, composites based on polyaniline (PAni) grafted with reduced graphene oxide (rGO) were obtained by the in situ chemical polymerization of aniline with rGO (mass ratio of 1 and 2.5%) dispersed into the monomer solutions. PAni and its PAni-rGO composites were used to prepare self-assembled (SA) films by depositing them onto indium tin oxide (ITO) substrates with alternating layers of polystyrene sulfonate (PSS). The structure and morphology of the materials were characterized by Fourier-transform infrared spectroscopy (FT-IR), RAMAN spectroscopy, and scanning electron microscopy (SEM). The oxidation states of PAni and its PAni-rGO composites were characterized by cyclic voltammetry (CV) and UV-Vis spectroscopy during the SA procedure. The electrochemical behavior of the obtained SA films was also characterized by electrochemical impedance spectroscopy (EIS). The EIS results showed a significant decrease in the polarization resistance (R_p), from 1020 to 302 Ω, for the film with 1% of rGO (PAni-1%rGO/PSS) when compared with its unmodified counterpart (PAni/PSS). The synergic effects observed for the PAni-1%rGO/PSS film showed that controlling the rGO mass ratio plays an important role in the improvement of the charge transfer processes, and that this electrode has potential for electrochemical applications, such as sensors and charge storage devices.

中文翻译：

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基于聚苯胺的还原氧化石墨烯和聚苯乙烯磺酸盐接枝的自组装电极

摘要

在这项工作中，通过苯胺的原位化学聚合，将rGO（质量比为1和2.5％）分散在单体溶液中，得到了以还原的氧化石墨烯（rGO）接枝的基于聚苯胺（PAni）的复合材料。通过将PAni及其PAni-rGO复合材料沉积到具有交替的聚苯乙烯磺酸盐（PSS）层的铟锡氧化物（ITO）基材上，可以制备自组装（SA）膜。通过傅里叶变换红外光谱（FT-IR），拉曼光谱和扫描电子显微镜（SEM）对材料的结构和形貌进行了表征。在SA程序中，通过循环伏安法（CV）和UV-Vis光谱对PAni及其PAni-rGO复合材料的氧化态进行了表征。所获得的SA膜的电化学行为也通过电化学阻抗谱（EIS）表征。EIS结果显示极化电阻显着降低（与未经修饰的对应薄膜（PAni / PSS）相比，具有1％rGO的薄膜（PAni-1％rGO / PSS）的R _p）为1020至302Ω。对PAni-1％rGO / PSS膜观察到的协同效应表明，控制rGO的质量比在改善电荷转移过程中起着重要作用，并且该电极具有电化学应用的潜力，例如传感器和电荷存储设备。