Tofel Pavel, Částková Klára, Říha David, Sobola Dinara, Papež Nikola, Kaštyl Jaroslav, Ţălu Ştefan, Hadaš Zdeněk
Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic.
Central European Institute of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic.
Nanomaterials (Basel). 2022 Jan 22;12(3):349. doi: 10.3390/nano12030349.
Utilizing the triboelectric effect of the fibrous structure, a very low cost and straightforward sensor or an energy harvester can be obtained. A device of this kind can be flexible and, moreover, it can exhibit a better output performance than a device based on the piezoelectric effect. This study is concerned with comparing the properties of triboelectric devices prepared from polyvinylidene fluoride (PVDF) fibers, polyamide 6 (PA) fibers, and fibrous structures consisting of a combination of these two materials. Four types of fibrous structures were prepared, and then their potential for use in triboelectric devices was tested. Namely, individual fibrous mats of () PVDF and () PA fibers, and their combination-() PVDF and PA fibers intertwined together. Finally, the fourth kind was (), a stratified three-layer structure, where the middle layer from PVDF and PA intertwined fibers was covered by PVDF fibrous layer on one side and by PA fibrous layer on the opposite side. Dielectric properties were examined and the triboelectric response was investigated in a simple triboelectric nanogenerator (TENG) of individual or combined () fibrous structures. The highest triboelectric output voltage was observed for the stratified three-layer structure (the structure of type) consisting of PVDF and PA individual and intertwined fibrous layers. This TENG generated 3.5 V at peak of amplitude at 6 Hz of excitation frequency and was most sensitive at the excitation signal. The second highest triboelectric response was observed for the individual PVDF fibrous mat, generating 2.8 V at peak at the same excitation frequency. The uniqueness of this work lies in the dielectric and triboelectric evaluation of the fibrous structures, where the materials PA and PVDF were electrospun simultaneously with two needles and thus created a fibrous composite. The structures showed a more effective triboelectric response compared to the fibrous structure electrospun by one needle.
利用纤维结构的摩擦电效应，可以获得一种成本极低且结构简单的传感器或能量收集器。这种装置可以是柔性的，而且，它可以表现出比基于压电效应的装置更好的输出性能。本研究旨在比较由聚偏氟乙烯（PVDF）纤维、聚酰胺6（PA）纤维以及由这两种材料组合而成的纤维结构制备的摩擦电装置的性能。制备了四种类型的纤维结构，然后测试了它们在摩擦电装置中的应用潜力。具体来说，有（）PVDF和（）PA纤维的单独纤维垫，以及它们的组合——（）PVDF和PA纤维交织在一起。最后，第四种是（），一种分层的三层结构，其中由PVDF和PA交织纤维组成的中间层一侧被PVDF纤维层覆盖，另一侧被PA纤维层覆盖。研究了介电性能，并在由单独或组合的（）纤维结构组成的简单摩擦电纳米发电机（TENG）中研究了摩擦电响应。对于由PVDF和PA单独及交织纤维层组成的分层三层结构（类型结构），观察到最高的摩擦电输出电压。该TENG在6 Hz的激励频率下，峰值幅度为3.5 V，并且对激励信号最敏感。对于单独的PVDF纤维垫，观察到第二高的摩擦电响应，在相同激励频率下峰值为2.8 V。这项工作的独特之处在于对纤维结构的介电和摩擦电评估，其中材料PA和PVDF通过两根针同时进行电纺丝，从而形成了纤维复合材料。与通过一根针电纺丝的纤维结构相比，这些结构表现出更有效的摩擦电响应。
