Polypyrrole (PPy) was synthesized with different weight percentages of acetic acid (10 wt%, 30 wt%, and 50 wt%) through chemical oxidative polymerization. The structural, functional, optical, morphological, dielectric and electrical properties of PPy were investigated by XRD, FT-IR, UV–Vis, SEM, electrical conductivity and impedance analysis. The XRD and SEM analysis shows the formation of PPy and confirms the amorphous nature and the merely globular structure of the material. The FT-IR spectrum reveals the functional groups present in the samples. The absorption peak centered at 280 nm indicates π–π* transition in the heteroatom aromatic pyrrole ring through the recorded UV–Vis spectrum. The calculated bandgap value of the PPy samples is found to be 4.25, 3.85 and 3.50 eV. The room temperature impedance spectroscopy performs to analyze the dielectric and electrical properties of PPy with the frequency range 50 Hz–5 MHz. The AC conductivity remains constant up to 1 MHz and its value increases slowly and attains a maximum at a higher frequency which confirms the semiconducting behavior of samples.

中文翻译：

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物理化学研究乙酸掺杂的聚吡咯的各种重量百分比的化学氧化聚合

通过化学氧化聚合，以不同重量百分比的乙酸（10 wt％，30 wt％和50 wt％）合成聚吡咯（PPy）。通过XRD，FT-IR，UV-Vis，SEM，电导率和阻抗分析研究了PPy的结构，功能，光学，形态，介电和电学性质。XRD和SEM分析显示了PPy的形成，并证实了该材料的无定形性质和仅有的球状结构。FT-IR光谱揭示了样品中存在的官能团。中心在280 nm处的吸收峰表明，在已记录的UV-Vis光谱中，杂原子芳族吡咯环中存在π-π*跃迁。发现PPy样品的计算带隙值为4.25、3.85和3.50 eV。室温阻抗谱用于分析频率范围为50 Hz-5 MHz的PPy的介电和电性能。交流电导率在最高1 MHz时保持恒定，其值缓慢增加并在较高频率下达到最大值，这证实了样品的半导体特性。