Abstract Polyaniline (PANI)/Cerium oxide (CeO2) hybrid composites with different concentrations of CeO2 were synthesized by in-situ polymerization of aniline. The resulting composites were characterized by various techniques, such as X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared spectroscopy (FT-IR). It was observed that the increase in concentration of CeO2 to PANI decreases the DC and AC conductivity of the composite. The CeO2 in PANI may block the charge carriers or reduces the delocalization length because of which reduction in conductivity was observed. The reduction in the quantum mechanical tunneling of charge carriers also could be the reason for the observed reduction in conductivity. The relaxation time (τ) increases from 0.4 μs for PANI to 154.5 μs for 20 wt% CeO2 sample also supports the electrical results. It is worth to mention that the precise modification in the relaxation is possible with varying CeO2 concentration, which can be helpful to get tailor-made properties. Hence this paper highlights the effect of CeO2 on AC and DC conducting properties of PANI/CeO2 composites. AC and DC conducting properties conclude that the synthesized composites can be used in energy storage, electronic devices, and biosensor applications.

中文翻译：

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聚苯胺-氧化铈复合材料的合成及电学性能

摘要 通过苯胺的原位聚合合成了不同浓度CeO2 的聚苯胺(PANI)/氧化铈(CeO2) 杂化复合材料。所得复合材料通过各种技术进行表征，例如 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、傅里叶变换红外光谱 (FT-IR)。据观察，CeO2 与 PANI 浓度的增加降低了复合材料的 DC 和 AC 电导率。PANI 中的 CeO2 可能会阻挡电荷载流子或减少离域长度，因为观察到电导率降低。电荷载流子量子力学隧穿的减少也可能是观察到的电导率降低的原因。弛豫时间 (τ) 从 PANI 的 0.4 μs 增加到 154。20 wt% CeO2 样品的 5 μs 也支持电学结果。值得一提的是，随着 CeO2 浓度的变化，可以对弛豫进行精确修改，这有助于获得量身定制的特性。因此，本文重点介绍了 CeO2 对 PANI/CeO2 复合材料的 AC 和 DC 导电性能的影响。交流和直流导电性能得出结论，合成的复合材料可用于储能、电子设备和生物传感器应用。