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Magnetic and high-dielectric-constant nanoparticle polymer tri-composites for sensor applications
Journal of Materials Science ( IF 4.5 ) Pub Date : 2020-08-28 , DOI: 10.1007/s10853-020-05165-6
A. Mooti , C. M. Costa , A. Maceiras , N. Pereira , C. R. Tubio , J. L. Vilas , S. Besbes-Hentati , S. Lanceros-Mendez

Multifunctional composites can be achieved by adding two different fillers with complementary properties to a polymer matrix. In this work, novel tri-composite multifunctional materials based on the incorporation of dielectric BaTiO3 (BT) and magnetic CoFe2O4 (CFO) nanoparticles into poly(vinylidene fluoride) (PVDF) have been developed with enhanced dielectric and magnetic responses for applications in areas such as energy harvesting, sensors and actuators. The microstructure, polymer phases as well as the thermal stability of the samples were investigated, showing the independence of the polymer crystallization phases, degree of crystallinity and melting temperature on filler type and contents. Further, independent of the type of the filler, its content improves the degradation temperature of the tri-composites. The magnetic properties and electrical conductivity of the tri-composites are correlated with the increase in the content of the CFO filler, while the dielectric response is mainly determined by the interfacial polarization. A high dielectric constant of 26 at 1 kHz and a magnetization of 5.7 emu * g−1 are obtained for a sample of 10 wt% CFO–10 wt% BT/PVDF, which was used for the demonstration of the suitability of the materials for magnetic deformation sensing. This work provides pathways for the development of tri-composites based on PVDF with high dielectric constant and magnetic properties for application in areas such as sensors and actuators.

中文翻译:

用于传感器应用的磁性和高介电常数纳米粒子聚合物三复合材料

多功能复合材料可以通过向聚合物基体中添加两种具有互补特性的不同填料来实现。在这项工作中,基于将介电 BaTiO3 (BT) 和磁性 CoFe2O4 (CFO) 纳米粒子结合到聚偏二氟乙烯 (PVDF) 中的新型三复合多功能材料已经开发出来,具有增强的介电和磁响应,可用于以下领域:作为能量收集、传感器和执行器。研究了样品的微观结构、聚合物相以及热稳定性,表明聚合物结晶相、结晶度和熔融温度对填料类型和含量的独立性。此外,与填料的类型无关,其含量提高了三元复合材料的降解温度。三元复合材料的磁性能和电导率与CFO填料含量的增加有关,而介电响应主要由界面极化决定。对于 10 wt% CFO–10 wt% BT/PVDF 样品,在 1 kHz 下获得了 26 的高介电常数和 5.7 emu * g-1 的磁化强度,该样品用于证明材料的适用性磁变形传感。这项工作为开发基于 PVDF 的具有高介电常数和磁性的三复合材料提供了途径,可用于传感器和执行器等领域。对于 10 wt% CFO–10 wt% BT/PVDF 样品,在 1 kHz 下获得了 26 的高介电常数和 5.7 emu * g-1 的磁化强度,该样品用于证明材料的适用性磁变形传感。这项工作为开发基于 PVDF 的具有高介电常数和磁性的三复合材料提供了途径,可用于传感器和执行器等领域。对于 10 wt% CFO–10 wt% BT/PVDF 样品,在 1 kHz 下获得了 26 的高介电常数和 5.7 emu * g-1 的磁化强度,该样品用于证明材料的适用性磁变形传感。这项工作为开发基于 PVDF 的具有高介电常数和磁性的三复合材料提供了途径,可用于传感器和执行器等领域。
更新日期:2020-08-28
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