具有定制压电性能的聚偏氟乙烯中空纤维的模拟引导同轴静电纺丝,Small

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具有定制压电性能的聚偏氟乙烯中空纤维的模拟引导同轴静电纺丝
Small ( IF 13.0 ) Pub Date : 2023-05-17 , DOI: 10.1002/smll.202303285
Zhuzhu Shao ₁ , Xuan Zhang ₁ , Zihan Song ₁ , Jingfeng Liu ₁ , Xingang Liu ₁ , Chuhong Zhang ₁

Affiliation

静电纺聚偏二氟乙烯（PVDF）压电纤维由于其高机电耦合能力，在机械能收集和自供电传感方面具有很高的潜在适用性。定制纤维形态的策略一直是实现增强压电输出的主要焦点。然而，压电性能与纤维结构之间的关系仍不清楚。本研究通过同轴静电纺丝制造PVDF中空纤维，其壁厚可以通过改变内部溶液浓度来调节。仿真分析表明，随着内径的增大，中空纤维的有效变形增加，从而导致压电输出增强，这与实验结果非常吻合。该研究首次从模拟和实验两个方面揭示了PVDF中空纤维形貌调控对其压电性能的影响机制。最佳的 PVDF 中空纤维压电能量收集器 (PEH) 可提供 32.6 V 的压电输出电压，约是实心 PVDF 纤维 PEH 的 3 倍。此外，中空纤维PEH的电输出可以稳定地存储在二次储能系统中，为微电子设备提供动力。这项研究强调了一种有效的方法来协调模拟和定制光纤 PEH 形态，以增强未来自供电系统的性能。

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Simulation Guided Coaxial Electrospinning of Polyvinylidene Fluoride Hollow Fibers with Tailored Piezoelectric Performance

Electrospun polyvinylidene fluoride (PVDF) piezoelectric fibers have high potential applicability in mechanical energy harvesting and self-powered sensing owing to their high electromechanical coupling capabilities. Strategies for tailoring fiber morphology have been the primary focus for realizing enhanced piezoelectric output. However, the relationship between piezoelectric performance and fiber structure remains unclear. This study fabricates PVDF hollow fibers through coaxial electrospinning, whose wall thickness can be tuned by changing the internal solution concentration. Simulation analysis demonstrates an increased effective deformation of the hollow fiber as enlarging inner diameter, resulting in enhanced piezoelectric output, which is in excellent agreement with the experimental results. This study is the first to unravel the influence mechanism of morphology regulation of a PVDF hollow fiber on its piezoelectric performance from both simulation and experimental aspects. The optimal PVDF hollow fiber piezoelectric energy harvester (PEH) delivers a piezoelectric output voltage of 32.6 V, ≈3 times that of the solid PVDF fiber PEH. Furthermore, the electrical output of hollow fiber PEH can be stably stored in secondary energy storage systems to power microelectronics. This study highlights an efficient approach for reconciling the simulation and tailoring the fiber PEH morphology for enhanced performances for future self-powered systems.

更新日期：2023-05-17

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