Lang Chenhong, Fang Jian, Shao Hao, Ding Xin, Lin Tong
College of Textiles, Donghua University, Shanghai 201620, China.
Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia.
Nat Commun. 2016 Mar 23;7:11108. doi: 10.1038/ncomms11108.
Considerable interest has been devoted to converting mechanical energy into electricity using polymer nanofibres. In particular, piezoelectric nanofibres produced by electrospinning have shown remarkable mechanical energy-to-electricity conversion ability. However, there is little data for the acoustic-to-electric conversion of electrospun nanofibres. Here we show that electrospun piezoelectric nanofibre webs have a strong acoustic-to-electric conversion ability. Using poly(vinylidene fluoride) as a model polymer and a sensor device that transfers sound directly to the nanofibre layer, we show that the sensor devices can detect low-frequency sound with a sensitivity as high as 266 mV Pa(-1). They can precisely distinguish sound waves in low to middle frequency region. These features make them especially suitable for noise detection. Our nanofibre device has more than five times higher sensitivity than a commercial piezoelectric poly(vinylidene fluoride) film device. Electrospun piezoelectric nanofibres may be useful for developing high-performance acoustic sensors.
利用聚合物纳米纤维将机械能转化为电能已引起了广泛关注。特别是，通过静电纺丝制备的压电纳米纤维展现出了卓越的机械能到电能的转换能力。然而，关于静电纺纳米纤维声电转换的数据却很少。在此，我们表明静电纺压电纳米纤维网具有很强的声电转换能力。以聚偏氟乙烯作为模型聚合物，并使用一种将声音直接传递到纳米纤维层的传感器装置，我们证明该传感器装置能够检测低频声音，灵敏度高达266 mV Pa⁻¹。它们能够精确区分低至中频区域的声波。这些特性使其特别适用于噪声检测。我们的纳米纤维装置的灵敏度比商用压电聚偏氟乙烯薄膜装置高出五倍以上。静电纺压电纳米纤维可能有助于开发高性能声学传感器。
