$δ$ -基于PVDF的柔性纳米发电机
$δ$-PVDF Based Flexible Nanogenerator
摘要：
通过电喷雾技术，通过在环境温度和压力下施加0.1 MV/m的电场来制造包含聚偏二氟乙烯（PVDF）纳米颗粒的δ（$δ$）相，所述电场比$δ$相变所需的典型值低10 $^{3}$。X射线衍射（XRD）和选区电子衍射（SAED）图案清楚地表明$δ$相的形成。基于压电响应力显微镜（PFM）的扫描探针显微镜技术证实了$δ$ -PVDF纳米粒子的压电和铁电响应。垂直压电响应的d $_{33}$系数为$\sim$-11 pm/V。采用扭结传播模型对电喷雾系统中的$δ$相变进行了验证。在外部冲击和声信号下来自包含$δ$ -PVDF纳米颗粒的纳米发生器的电响应表明，负责压电响应的分子铁电偶极子在纳米颗粒形成期间原位极化，因此不需要进一步的电极化。
英文摘要：
Delta ($δ$) phase comprising polyvinylidene fluoride (PVDF) nanoparticles are fabricated through electrospray technique by applying 0.1 MV/m electric field at ambient temperature and pressure, which is 10$^{3}$ times lower than the typical value, required for $δ$-phase transformation. The X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns are clearly indicating the $δ$-phase formation. The piezo- and ferro- electric response of the $δ$-PVDF nanoparticles has been demonstrated through scanning probe microscopic technique based on piezoresponse force microscopy (PFM). The vertical piezoelectric response, indicated by d$_{33}$ coefficient, is found $\sim$-11 pm/V. Kink propagation model is adopted to justify the $δ$-phase conversion in electrospray system. The electrical response from $δ$-PVDF nanoparticle comprised nanogenerator under the external impacts and acoustic signal indicates that molecular ferroelectric dipoles responsible for piezoelectric responses, are poled in-situ during nanoparticle formation, thus further electrical poling is not necessary.
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