Electrospun poly(vinylidene fluoride) (PVDF) nanofiber web has been widely utilized as a functional material in various flexible sensors and generators due to its high piezoelectricity, ease processability, and low cost. Among all the crystalline phases of PVDF, β-phase is a key property for PVDF nanofiber web, because the content of β-phase is directly proportional to piezoelectric performance of PVDF nanofiber web. Herein, the impact of graphene content (GC), tip-to-collector distance (TCD), and rotational speed of collector (RSC), as well as their interactions on the β-phase formation of PVDF nanofiber web is systematically investigated via design of experimental method. The fraction of each crystalline phase of PVDF nanofiber web is calculated by FTIR spectra, and the crystallinity is determined by XRD patterns. The influences of GC, TCD, and RSC on both β-phase fraction and crystallinity of PVDF nanofiber are analyzed using Minitab program. The results show that GC, TCD, and RSC all have significant effect on the β-phase content of PVDF nanofiber web, and GC is the most significant one. In addition, an optimal electrospinning condition (GC = 1 wt%, TCD = 4 cm, and RSC = 2000 r-min⁻¹) to fabricate high β-phase crystallinity of PVDF nanofiber web is drawn, under which the crystallinity can reach 41.7%. The contributions in this study could provide guidance for future research on fabricating high performance PVDF nanofiber web based sensors or generators.

电纺聚偏二氟乙烯（PVDF）纳米纤维网由于其高压电性，易加工性和低成本而被广泛用作各种柔性传感器和发生器中的功能材料。在PVDF的所有结晶相中，β相是PVDF纳米纤维网的关键特性，因为β相的含量与PVDF纳米纤维网的压电性能成正比。在此，系统地研究了石墨烯含量（GC），尖端到收集器的距离（TCD）和收集器的旋转速度（RSC）以及它们的相互作用对PVDF纳米纤维网的β相形成的影响。实验方法的设计。通过FTIR光谱计算PVDF纳米纤维网的每个结晶相的分数，并通过XRD图谱确定结晶度。使用Minitab程序分析了GC，TCD和RSC对PVDF纳米纤维的β相分数和结晶度的影响。结果表明，GC，TCD和RSC均对PVDF纳米纤维网的β相含量有显着影响，其中GC最显着。另外，最佳的静电纺丝条件（GC = 1 wt％，TCD = 4 cm，RSC = 2000 r-min ^-1）可制造高β绘制了PVDF纳米纤维网的相结晶度，在此下结晶度可达到41.7％。这项研究的贡献可以为未来基于高性能PVDF纳米纤维网的传感器或发生器的研究提供指导。