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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Conductivity mechanism of polyaniline organic films: the effects of solvent type and casting temperature
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Conductivity mechanism of polyaniline organic films: the effects of solvent type and casting temperature

机译：聚苯胺有机薄膜的电导机理：溶剂类型和流延温度的影响

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摘要

In this work, we report a study of the effect of the solvent type and the casting temperature on the electrical properties of pure fully doped conducting polymer films (polyaniline, PANI).PANI was dispersed in two different solvents (dichloroacetic acid (DCAA), and a mixtureof dichloro-acetic acid and formic acid (DCAA–FA)). Previous work showed that at around318 K, a second order liquid–liquid structural transition occurs in the dispersions.Consequently, we have chosen three different casting temperatures (298 'room temperature',318 and 353 K). The electrical properties of the cast films were investigated in the frequencyrange 100 Hz-1 MHz. The temperature was varied between 20 and 300 K. We found that thedc conductivity is governed by Mott's three-dimensional variable range hopping modelfor the PANI/DCAA films and by a fluctuation induced tunnelling model (FIT) for thePANI/DCAA–FA films. The different Mott and FIT parameters have been evaluated. Thedependence of such values on the processing parameters is discussed. The x-ray diffractiontechnique was also used. A reasonable correlation between microstructure and electricalproperties was found. Furthermore, the films cast at the structural transition temperature hadthe lowest conductivity.
机译：在这项工作中，我们报告了溶剂类型和流延温度对纯全掺杂导电聚合物薄膜（聚苯胺，PANI）的电性能的影响的研究.PANI分散在两种不同的溶剂（二氯乙酸（DCAA），以及二氯乙酸和甲酸的混合物（DCAA–FA）。先前的工作表明，在分散体中会在318 K附近发生二阶液-液结构转变。因此，我们选择了三种不同的浇铸温度（298'室温'，318和353 K）。在100 Hz-1 MHz的频率范围内研究了流延薄膜的电性能。温度在20到300 K之间变化。我们发现直流电导率受PANI / DCAA膜的Mott三维可变范围跳变模型和PANI / DCAA-FA膜的波动诱导隧穿模型（FIT）的控制。已评估了不同的Mott和FIT参数。讨论了这些值对处理参数的依赖性。还使用了X射线衍射技术。发现微观结构和电性能之间的合理关联。此外，在结构转变温度下流延的膜具有最低的电导率。

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