High-Performance Triboelectric Nanogenerators Based on Electrospun Polyvinylidene Fluoride-Silver Nanowire Composite Nanofibers
High-Performance Triboelectric Nanogenerators Based on Electrospun Polyvinylidene Fluoride-Silver Nanowire Composite Nanofibers
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DOI：
10.1002/adfm.201703778
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发表时间：
2018-01-10
影响因子：
19
通讯作者：
Cho, Jeong Ho
中科院分区：
文献类型：
--
作者：
Cheon, Siuk;Kang, Hyungseok;Cho, Jeong Ho
描述了用于高性能摩擦电纳米发电机（TENGs）的铁电聚合物-金属纳米线复合摩擦电层的制备。电纺聚偏二氟乙烯（PVDF）-银纳米线（AgNW）复合材料和尼龙纳米纤维分别用作TENG的顶部和底部摩擦电层。静电纺丝过程促进聚合物链的单轴拉伸，这增强了形成PVDF的最极性结晶相的高度取向的结晶β相的形成。AgNW的加入通过在纳米线的表面电荷和PVDF链的偶极子之间引入静电相互作用来进一步促进β相晶体的形成。使用X射线衍射（XRD）和开尔文探针力显微镜技术系统地分析了β相形成的程度以及添加纳米线后表面电荷电位的变化。捕获诱导的摩擦电荷的能力增加后，添加纳米线的PVDF矩阵。PVDF-AgNW复合纳米纤维的增强的表面电荷电势和电荷捕获能力显著增强了TENG输出性能。最后，通过在PVDF的熔融温度附近施加热焊接，电纺纳米纤维的机械稳定性显著增强，同时保持TENG性能。
The preparation of ferroelectric polymer-metallic nanowire composite nanofiber triboelectric layers is described for use in high-performance triboelectric nanogenerators (TENGs). The electrospun polyvinylidene fluoride (PVDF)-silver nanowire (AgNW) composite and nylon nanofibers are utilized in the TENGs as the top and bottom triboelectric layers, respectively. The electrospinning process facilitates uniaxial stretching of the polymer chains, which enhances the formation of the highly oriented crystalline beta-phase that forms the most polar crystalline phase of PVDF. The addition of AgNWs further promotes the beta-phase crystal formation by introducing electrostatic interactions between the surface charges of the nanowires and the dipoles of the PVDF chains. The extent of beta-phase formation and the resulting variations in the surface charge potential upon the addition of nanowires are systematically analyzed using X-ray diffraction (XRD) and Kelvin probe force microscopy techniques. The ability of trapping the induced tribocharges increases upon the addition of nanowires to the PVDF matrix. The enhanced surface charge potential and the charge trapping capabilities of the PVDF-AgNW composite nanofibers significantly enhance the TENG output performances. Finally, the mechanical stability of the electrospun nanofibers is dramatically enhanced while maintaining the TENG performances by applying thermal welding near the melting temperature of PVDF.