Interphase-assisted suppression of electrode polarization in nanoparticulate-elastomeric composites
Interphase-assisted suppression of electrode polarization in nanoparticulate-elastomeric composites
复制标题
DOI：
10.1063/5.0141243
复制
发表时间：
2023-04
影响因子：
3.2
通讯作者：
A. Barhoumi Meddeb;Z. Ounaies
中科院分区：
文献类型：
--
作者：
A. Barhoumi Meddeb;Z. Ounaies
聚合物纳米复合材料的电性能取决于内部电荷的行为。特别是，纳米颗粒周围的界面强烈影响纳米复合材料中电荷载流子的分布和迁移率，这反过来又影响这些材料的性能。在这项工作中，我们探测的内部电荷行为的纳米粒子的存在下，专注于低频政权使用一套技术。通过研究去极化电流和介电性能对频率和温度的依赖关系，我们证明了相间重新分配空间电荷，增加它们的陷阱深度，并抑制电极极化的弹性体纳米复合材料。此外，我们研究了纳米粒子含量对介电行为的影响，通过比较1，2，和4体积%的纳米复合材料的内部电荷行为。在只有4体积%的负载，载流子的迁移率是有效地限制，导致较低的直流电导率相比，未填充的弹性体，和1和2体积%的纳米复合材料。这些发现是基于本研究中使用的模型材料，TiO2纳米颗粒和聚二甲基硅氧烷，并可以扩展到其他纳米颗粒填充的弹性体复合材料，以设计具有改进功能的轻量化传感器，执行器和传感器。在聚合物纳米复合材料界面现象的明智的操纵，特别是那些与稀释含量的纳米粒子，提供了一个有前途的道路前进的设计材料具有特殊的电气和其他物理性能。
The electrical properties of polymer nanocomposites are governed by the behavior of the internal charges. In particular, the interphase around the nanoparticles strongly influences the distribution and mobility of charge carriers within the nanocomposites, which, in turn, impacts the performance of these materials. In this work, we probe the internal charge behavior in the presence of nanoparticles with a focus on the low-frequency regime using a suite of techniques. By investigating the depolarizing currents and the dependence of the dielectric properties on the frequency and temperature, we demonstrate that the interphases redistribute the space charges, increase their trap depth, and suppress the electrode polarization in an elastomeric nanocomposite. Additionally, we study the effect of the nanoparticle content on the dielectric behavior by comparing the internal charge behavior of 1, 2, and 4 vol. % nanocomposites. At only 4 vol. % loading, the mobility of charge carriers is effectively limited, leading to lower dc conductivity compared to the unfilled elastomer, and 1 and 2 vol. % nanocomposites. These findings are based on the model materials used in this study, TiO2 nanoparticles and polydimethylsiloxane, and can be extended to other nanoparticulate-filled elastomer composites to design lightweight dielectrics, actuators, and sensors with improved capabilities. Judicious manipulation of interfacial phenomena in polymer nanocomposites—especially those with a dilute content of nanoparticles—provides a promising path forward for the design of materials with exceptional electrical and other physical properties.