A flexible, accurate and highly sensitive sound detection and recognition sensor was fabricated in this study; this was achieved by employing a polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) film and in-situ polarization. The PVDF-TrFE film was polarized using our polarization system within 5 min without heating; further, this system has the advantages of high production efficiency, excellent piezoelectric performances, and good uniformity compared to traditional poling approaches. The sound detection and recognition sensor responded to various types of sound waves in a wide range of frequencies with an error of less than 1% by producing corresponding voltage signal; these can be used to accurately identify complex sound signals with different frequencies and different intensities. Furthermore, the sensor was flexible and self-powered. All the above features render it hold great potential in various applications, such as microphones, biometrics, environmental protection and artificial intelligence.

本研究制造了一种灵活，准确和高度灵敏的声音检测和识别传感器。这是通过使用聚偏二氟乙烯-三氟乙烯（PVDF-TrFE）薄膜并就地完成的极化。使用我们的偏振系统在5分钟内不加热就将PVDF-TrFE膜偏振了；此外，与传统的极化方法相比，该系统具有生产效率高，压电性能优异和均匀性好的优点。声音检测和识别传感器通过产生相应的电压信号，在很宽的频率范围内响应各种类型的声波，误差小于1％。这些可用于精确识别具有不同频率和强度的复杂声音信号。此外，该传感器具有灵活性和自供电能力。上述所有功能使其在各种应用中具有巨大的潜力，例如麦克风，生物识别技术，环境保护和人工智能。