Curvilinear Slit Electrodes and Orientated PAN‐PVDF Nanofibers: Synergistic Broadband and Acoustoelectric Enhancement for Multi‐Mode Power Generation, Speech Recognition, and Voice Recording

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Acoustoelectric nanofibers hold great promise for advancing human‐machine interaction in fields such as AI, healthcare, and IoT, but their narrow frequency response limits their broader application. Inspired by a scorpion's slit sensillum, a novel curvilinear slit‐structured device is developed using electrospun PAN (polyacrylonitrile)‐PVDF (polyvinylidene fluoride) nanofibers as the active layer and gold‐coated film electrodes with sinusoidal slits. The 4 × 3 cm 2 device responds to sounds from 100 to 1300 Hz and achieves a peak output of 87.85 V and 15.64 µA current, and 384 mW m −2 power density, 4–5 times higher than single‐component PAN or PVDF devices. It also demonstrates superior audio recording performance (66.8 dB signal‐to‐noise ratio) and gives a machine learning‐based speech recognition system 96% accuracy. It can also directly power consumer electronics. This work expands the frequency range of nanofiber acoustoelectric systems and paves the way for practical applications in next‐generation interactive technologies.