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Fabrication and Characterization of Aligned Flexible Lead-Free Piezoelectric Nanofibers for Wearable Device Applications

机译:用于穿戴设备的定向柔性无铅压电纳米纤维的制备与表征

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摘要

Flexible lead-free piezoelectric nanofibers, based on BNT-ST (0.78Bi0.5Na0.5TiO3-0.22SrTiO3) ceramic and poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) copolymers, were fabricated by an electrospinning method and the effects of the degree of alignment in the nanofibers on the piezoelectric characteristics were investigated. The microstructure of the lead-free piezoelectric nanofibers was observed by field emission scanning electron microscope (FE-SEM) and the orientation was analyzed by fast Fourier transform (FFT) images. X-ray diffraction (XRD) analysis confirmed that the phase was not changed by the electrospinning process and maintained a perovskite phase. Polarization-electric field (P-E) loops and piezoresponse force microscopy (PFM) were used to investigate the piezoelectric properties of the piezoelectric nanofibers, according to the degree of alignment—the well aligned piezoelectric nanofibers had higher piezoelectric properties. Furthermore, the output voltage of the aligned lead-free piezoelectric nanofibers was measured according to the vibration frequency and the bending motion and the aligned piezoelectric nanofibers with a collector rotation speed of 1500 rpm performed the best.
机译:通过电纺丝方法制备了基于BNT-ST(0.78Bi0.5Na0.5TiO3-0.22SrTiO3)陶瓷和聚偏二氟乙烯-三氟乙烯(PVDF-TrFE)共聚物的柔性无铅压电纳米纤维,研究了纳米纤维的取向度对压电特性的影响。通过场发射扫描电子显微镜(FE-SEM)观察了无铅压电纳米纤维的微观结构,并通过快速傅立叶变换(FFT)图像分析了取向。 X射线衍射(XRD)分析证实该相不会因电纺丝过程而改变,并保持钙钛矿相。根据取向程度,使用极化电场(P-E)回路和压电响应力显微镜(PFM)研究了压电纳米纤维的压电性能-排列良好的压电纳米纤维具有较高的压电性能。此外,根据振动频率和弯曲运动测量取向的无铅压电纳米纤维的输出电压,并且集电体转速为1500rpm的取向的压电纳米纤维表现最佳。

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