研究目的
The aim of the study is to understand frequency dependence of electric conductivity and the effect of grain and grain boundaries on the transport and complex modulus property of the PPy/LCM nano-composite.
研究成果
The PPy/LCM composites exhibit frequency-dependent electrical conductivity and dielectric properties, with relaxation mechanisms being non-Debye type. The composites show potential as organic dielectric materials for electric storage devices and as electrical tunable materials based on the percentage of LCM in the PPy chain.
研究不足
The study is limited to the frequency range of 100 Hz–5 MHz and room temperature conditions. The effects of higher frequencies and temperatures on the properties of the composites were not explored.
1：Experimental Design and Method Selection:
The study involves the synthesis of polypyrrole/La0.7Ca0.3MnO3 perovskite magnetic nano-composites by in situ chemical oxidation method using ammonium persulfate as oxidant. The morphology and crystal phase were analyzed using SEM, TEM, and XRD. Electrical properties were studied using AC impedance analyzer.
2：7Ca3MnO3 perovskite magnetic nano-composites by in situ chemical oxidation method using ammonium persulfate as oxidant. The morphology and crystal phase were analyzed using SEM, TEM, and XRD. Electrical properties were studied using AC impedance analyzer.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: High-purity chemicals from Aldrich were used for the synthesis of La0.7Ca0.3MnO3 (LCM) by sol-gel method. Polypyrrole (PPy) was synthesized by in situ chemical oxidation method using pyrrole and ammonium persulfate.
3：7Ca3MnO3 (LCM) by sol-gel method. Polypyrrole (PPy) was synthesized by in situ chemical oxidation method using pyrrole and ammonium persulfate.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: SEM (Vega3 TESCAN), TEM (JEM 2100), X-ray diffractometer (X’Pert3 Power), AC impedance analyzer (WAYNE KERR ELECTRONICS), hydraulic press (Shimadzu, Japan).
4：Experimental Procedures and Operational Workflow:
The synthesis involved the preparation of LCM nanoparticles, PPy, and PPy/LCM composites. The composites were characterized for their electrical properties in the frequency range of 100 Hz–5 MHz at room temperature.
5：Data Analysis Methods:
Electrical conductivity, dielectric constant, dielectric loss, and complex modulus were calculated using specific equations to understand the transport properties and relaxation mechanisms.
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