Abstract The low piezoelectric response (piezoelectric coefficient d33 lower than 30 pC N−1) of PVDF-based polymers limits their practical applications. Here we report a mechanical structure which can enhance the effective piezoelectric response of P(VDF-TrFE) copolymer. The polymer films were fabricated into a circular arch structure or arrays of arch structures. When a plane force was applied to the arch films, the force is concentrated at the outer rim of the arch structure. The effective piezoelectric response can be enhanced by >70 times because of the stress concentration and the measured effective piezoelectric response can be as high as 1990 pC N−1. The arch films exhibit an enhanced energy harvesting performance when they are utilized as mechanical energy harvesting devices. The output power density was improved by >2700 times compared with that measured in the films without arch structure. An output power density of 9 mW cm−3 was achieved in the arch films under non-resonance frequency. These results indicate that the proposed polymer-based structure is promising for the practical applications in high-performance flexible piezoelectric devices.

中文翻译：

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用于有效能量收集器的结构调制 P(VDF-TrFE) 薄膜器件的有效压电响应增加

摘要 PVDF 基聚合物的低压电响应（压电系数 d33 低于 30 pC N-1）限制了它们的实际应用。在这里，我们报告了一种机械结构，可以增强 P(VDF-TrFE) 共聚物的有效压电响应。将聚合物薄膜制成圆形拱形结构或拱形结构阵列。当对拱膜施加平面力时，力集中在拱结构的外缘。由于应力集中，有效压电响应可提高 70 倍以上，测得的有效压电响应可高达 1990 pC N-1。拱形薄膜在用作机械能量收集装置时表现出增强的能量收集性能。输出功率密度提高了 > 2700 倍与在没有拱形结构的薄膜中测量的相比。在非共振频率下，拱形薄膜的输出功率密度达到了 9 mW cm-3。这些结果表明，所提出的聚合物基结构有望在高性能柔性压电器件中得到实际应用。