Abstract

Polymer nanocomposites (PNCs) are state-of-the-art composites consisting of nanofiller-materials included in polymer matrices and bearing the integrated, promising properties of both the polymer and the nanofiller. They are now renowned as advanced materials for the development of polymer nanotechnology-based flexible and stretchable-type multifunctional organoelectronic devices as well as improved daily use products. Characterization of their dielectric properties permits some of these PNCs to be used as polymer nanodielectrics (PNDs), resulting in confirming the suitability and performance improvement of the electronic devices. This work deals with the dielectric behavior of wide band gap semiconducting zinc oxide (ZnO) and titanium dioxide (TiO₂) nanoparticles dispersed biodegradable poly(vinyl pyrrolidone) (PVP) matrix-based PNC films. The results confirmed the tunable and considerably increased dielectric permittivity with increasing nanofillers content in the range 1–5 wt% for these PNC films. The influence of the ZnO and TiO₂ nanoparticles sizes and their dielectric permittivities, and also of the polymer–nanoparticle interactions and interfaces, on the dielectric polarization and charge conduction mechanisms of the PNC films with increasing frequency from 2 × 10¹ to 10⁶ Hz were identified, and the suitability of these materials as biodegradable PNDs is discussed. Further, the appreciable homogeneous distribution of these crystalline nanoinclusions in the amorphous PVP matrix and the successful formation of hybrid nanocomposites were ascertained from our XRD results.

摘要

聚合物纳米复合材料（PNC）是由聚合物基质中包含的纳米填料材料组成的先进复合材料，具有聚合物和纳米填料的综合，有希望的性能。它们现在作为开发基于聚合物纳米技术的柔性和可拉伸型多功能有机电子器件以及改进的日用产品的先进材料而闻名。其介电特性的表征允许将其中一些PNC用作聚合物纳米电介质（PND），从而证实了电子设备的适用性和性能的提高。这项工作处理宽带隙半导体氧化锌（ZnO）和二氧化钛（TiO ₂）纳米颗粒分散了可生物降解的聚乙烯基吡咯烷酮（PVP）基质基PNC膜。结果证实，这些PNC薄膜的纳米填料含量在1-5 wt％范围内时，介电常数可调且显着提高。ZnO和TiO ₂纳米粒子的尺寸及其介电常数以及聚合物-纳米粒子的相互作用和界面对PNC薄膜的介电极化和电荷传导机制的影响，其频率从2×10 ¹增加到10 ⁶ 确定了Hz，并讨论了这些材料作为可生物降解PND的适用性。此外，从我们的X射线衍射结果可以确定这些晶体纳米夹杂物在无定形PVP基质中的明显均匀分布以及杂化纳米复合物的成功形成。