Abstract

In the present research work, the pristine polyaniline and iron chloride-embedded polyaniline nanocomposites were synthesized by adopting the chemical oxidative polymerization route. The AC conductivity and dielectric properties of the titled samples were measured in temperature and frequency range of 173–373 K and 100 mHz to 1 MHz, respectively. The result reveals that the dielectric constant of synthesized samples increases as temperature increases whereas it decreases with an increase in applied frequency. The dielectric constant of pristine polyaniline found to be ∼ 497 which attains value ∼ 875 on the addition of 25 wt% iron chloride, which indicates that dielectric properties are strongly affected by the doping of iron chloride. In addition to that various theoretical models such as Arrhenius model, Jonscher power law, etc. were employed to analyze the charge transport mechanism. The low value of AC conductivity signifies its strong dependency on both frequency and temperature. AC conductivity increases with the increase in operating temperature as well as applied frequency, which may be attributed to the increase in the concentration of iron chloride trapped charge carriers.

Graphical abstract

中文翻译：

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氯化铁嵌入聚苯胺纳米复合材料介电性能的深入研究

摘要

在目前的研究工作中，采用化学氧化聚合路线合成了原始聚苯胺和氯化铁包埋的聚苯胺纳米复合材料。标题样品的交流电导率和介电性能分别在 173–373 K 和 100 mHz 至 1 MHz 的温度和频率范围内测量。结果表明，合成样品的介电常数随着温度的升高而增加，而随着施加频率的增加而降低。原始聚苯胺的介电常数为约 497，添加 25 wt% 氯化铁后介电常数达到约 875，这表明介电性能受到氯化铁掺杂的强烈影响。此外还采用阿伦尼乌斯模型、琼舍尔幂律等多种理论模型来分析电荷传输机制。交流电导率的低值表明其对频率和温度的强烈依赖性。交流电导率随着工作温度和应用频率的增加而增加，这可能归因于氯化铁捕获的电荷载流子浓度的增加。

图形概要