High‐performance flexible loudspeakers have the potential to revolutionize the future of flexible/wearable electronics by providing this long‐sought function. Here, a novel method is developed to produce large‐area, flexible, and transparent piezoelectric loudspeakers, where both piezoelectric lead zirconate titanate (PZT) nanoparticles and graphene nanoplatelets (GNPs) are simultaneously aligned in the thickness direction forming dense “nanocolumn forests.” The preferential alignment of the particles not only reduces filler concentration and improves the piezoelectric performance, but also provides transparency to the film by enabling light to travel with little scattering or absorption in the thickness direction. Its potential applications, such as wearable and portable personal audio systems, along with a 9‐ft‐tall immersive walk‐through soundscape structure, are also demonstrated. The performance and the directivity of each loudspeaker are characterized through sound pressure level (SPL) versus frequency measurements over human audio spectrum (20 Hz–20 kHz) in an anechoic chamber. Furthermore, scalability of this unique roll‐to‐roll process is demonstrated on a 44‐ft‐long custom designed roll‐to‐roll (R2R) manufacturing line that can produce these six‐inch‐wide multifunctional films continuously.

中文翻译：

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卷到卷的新型大面积压电薄膜，用于透明，柔性和可穿戴的织物扬声器

高性能的柔性扬声器通过提供这种长期需求的功能，有可能改变柔性/可穿戴电子设备的未来。在这里，开发了一种新颖的方法来生产大面积，灵活且透明的压电扬声器，其中压电锆钛酸钛酸铅（PZT）纳米颗粒和石墨烯纳米片（GNP）在厚度方向上同时对齐，从而形成密集的“纳米柱林”。颗粒的优先排列不仅降低了填料浓度并改善了压电性能，而且还通过使光在厚度方向上几乎没有散射或吸收地传播而为膜提供了透明性。它的潜在应用，例如可穿戴和便携式个人音频系统，还展示了9英尺高的沉浸式步入式声景结构。每个扬声器的性能和指向性通过消声室内声压级（SPL）与人类音频频谱（20 Hz–20 kHz）上的频率测量值来表征。此外，这种独特的卷对卷工艺的可扩展性在一条44英尺长​​的定制卷对卷（R2R）生产线上得到了证明，该生产线可以连续生产这些6英寸宽的多功能薄膜。