With the rapid development of internet of things and wearable electronics, how to conveniently power uncountable sensors remains a huge challenge. Energy harvesting strategy is suggested to collect and convert environmental energies into electrical energy. Thereinto, piezoelectric polymers are utilized as flexible harvesters to convert mechanical energy. The latter widely distributes in both our daily life and industrial environment. Intrinsic piezoelectric property further drives piezoelectric polymers to construct flexible self-powered strain sensors. However, relatively low piezoelectric performance restricts their application in detection and conversion of weak mechanical excitations. Herein, wave-shaped 3D piezoelectric device was fabricated by embossing electrospun polyvinylidene fluoride nanofibers. This 3D structured device presents better longitudinal and transverse piezoelectric performance than usual flat-type one. This wave-shaped piezoelectric device was developed for acoustic detection and recognition with a frequency resolution better than 0.1 Hz. This wave-shaped device was capable of frequency spectrum analyses of various sound sources from human and animals and well presents its potential for future wearable acoustic sensors and transducers.

随着物联网和可穿戴电子产品的快速发展，如何方便地为无数传感器供电仍然是一个巨大的挑战。建议采用能量收集策略来收集环境能量并将其转换为电能。其中，压电聚合物被用作柔性收集器来转换机械能。后者广泛分布在我们的日常生活和工业环境中。固有压电特性进一步驱动压电聚合物构建灵活的自供电应变传感器。然而，相对较低的压电性能限制了它们在弱机械激发检测和转换中的应用。在此，通过对电纺聚偏二氟乙烯纳米纤维进行压花来制造波浪形 3D 压电器件。这种 3D 结构器件比通常的平面型器件具有更好的纵向和横向压电性能。这种波形压电器件是为声学检测和识别而开发的，频率分辨率优于 0.1 Hz。这种波形设备能够对来自人类和动物的各种声源进行频谱分析，并很好地展示了其未来可穿戴声学传感器和换能器的潜力。