Morphological, structural, electrical impedance, and equivalent circuit analysis of polypyrrole/barium substituted lanthanum manganite (La0.7Ba0.3MnO3) perovskite nanocomposites

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE International Journal of Polymer Analysis and Characterization Pub Date : 2023-04-01 DOI:10.1080/1023666X.2023.2201083

Smitha M. G. , Sandeep Kumar H. L. , Shwetha

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Abstract

The article presents the impedance analysis of polypyrrole (PPy)/La_0.7Ba_0.3MnO₃ (LBM) nanocomposites synthesized by in situ chemical oxidation method. The morphology and crystal structure were analyzed by Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. Vibration modes were analyzed using Fourier Transform Infrared spectroscopy (FTIR). The impedance behavior of the compounds was studied using an impedance analyzer in the frequency (100 Hz − 5 MHz) and temperature (30 °C − 90 °C) variation mode. Results of SEM and TEM for PPy, LBM, and PPy-LBM nanocomposites show spherical, rhombic and granular structures respectively. FTIR shows the presence of respective elements to be present for the formation of PPy, LBM, and PPy-LBM compounds. XRD patterns of PPy, LBM, and PPy-LBM nanocomposites show amorphous, orthorhombic, and semicrystalline phases respectively. The Real part of impedance shows decreasing value with frequency and the imaginary part of impedance shows the relaxing nature of the compounds. Cole − Cole analysis reveals the resistance contribution from grains and grain boundary. The equivalent circuit elucidated gives the combination of resistor and capacitor being parallel along with constant phase element and Warburg effects. The study helps us to understand the electric behavior of the samples whether capacitive or resistive type for which further studies can be conducted for sensor, anticorrosion coating, and spintronic applications.

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聚吡啶/钡取代锰酸镧(La0.7Ba0.3MnO3)钙钛矿纳米复合材料的形态、结构、电阻抗和等效电路分析

本文介绍了原位化学氧化法制备聚吡啶(PPy)/La0.7Ba0.3MnO3 (LBM)纳米复合材料的阻抗分析。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和x射线衍射(XRD)技术对其形貌和晶体结构进行了分析。利用傅里叶变换红外光谱(FTIR)分析了振动模式。利用阻抗分析仪研究了化合物在频率(100 Hz ~ 5 MHz)和温度(30℃~ 90℃)变化模式下的阻抗行为。PPy、LBM和PPy-LBM纳米复合材料的SEM和TEM结果分别为球形、菱形和粒状结构。FTIR显示了形成PPy、LBM和py -LBM化合物的相应元素的存在。PPy、LBM和py -LBM纳米复合材料的XRD谱图分别表现为非晶相、正交相和半晶相。阻抗实部随频率的增加而减小，而阻抗虚部随频率的增加而减小。Cole−Cole分析揭示了晶粒和晶界对电阻的贡献。所阐述的等效电路是电阻和电容并联组合，并具有恒相元和沃伯格效应。该研究有助于我们了解样品的电行为，无论是电容型还是电阻型，进一步的研究可以用于传感器，防腐涂层和自旋电子应用。

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来源期刊

International Journal of Polymer Analysis and Characterization 化学-高分子科学

CiteScore

3.50

自引率

5.30%

发文量

审稿时长

1.6 months

期刊介绍： The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.