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

Abstract 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.