Energy scavenging has been attracting the consideration of researchers in recent years. In this study, the fabrication and characterization of electrospun randomly oriented and aligned grooved polyvinylidene fluoride (PVDF) and poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) fiber webs are studied. The fibers are generated with comparable diameters and the webs which are used as an active layer to directly make a piezoelectric nanogenerator are fabricated with the same thickness for accurate comparison. The results show that PVDF-TrFE fiber webs have better mechanical properties, crystallinity, and piezoelectric properties than PVDF fiber webs. Furthermore, the piezoelectric nanogenerator based on PVDF-TrFE fiber webs has higher electrical outputs than piezoelectric nanogenerator based on PVDF fiber webs owing to its high β phase content (F(β)). Moreover, the electrical outputs of the piezoelectric nanogenerator based on aligned fiber webs are higher than those based on randomly oriented fiber webs due to the increase in the friction area. We believe that our work can be served as a good reference for the comparison between the mechanical, physicochemical, and piezoelectric properties of PVDF and PVDF-TrFE fiber webs generated via electrospinning.

中文翻译：

---

静电纺聚偏二氟乙烯和聚（偏二氟乙烯-三氟乙烯）纤维网的比较研究：机械性能、结晶度和压电性能

近年来，能量清除一直吸引着研究人员的考虑。在这项研究中，研究了电纺随机取向和排列的带槽聚偏二氟乙烯 (PVDF) 和聚（偏二氟乙烯-三氟乙烯）（PVDF-TrFE）纤维网的制造和表征。生成的纤维具有可比的直径，并且用作活性层以直接制造压电纳米发电机的纤维网被制造为具有相同的厚度以进行精确比较。结果表明，PVDF-TrFE纤维网比PVDF纤维网具有更好的机械性能、结晶度和压电性能。此外，由于其高β相含量（F（β）），基于PVDF-TrFE纤维网的压电纳米发电机比基于PVDF纤维网的压电纳米发电机具有更高的电输出。此外，由于摩擦面积的增加，基于排列纤维网的压电纳米发电机的电输出高于基于随机取向纤维网的压电纳米发电机。我们相信我们的工作可以作为比较通过静电纺丝产生的 PVDF 和 PVDF-TrFE 纤维网的机械、物理化学和压电性能的良好参考。