All fibrous electronic skin based on excellent flexibility and piezoelectric properties could be widely applied in monitoring and healthcare sensing. The accumulative moisture during application scenarios, just as violent sweat or a damp environment, can affect the stability and sensitivity of the piezoelectric signal. Here, a bilayer piezoelectric sensor was fabricated using a layer-by-layer electrospinning technique. The inner layer is composed of hydrophobic piezoelectric polyvinylidene fluoride (PVDF)-zinc oxide (ZnO) nanofibers, while the outer layer consists of hydrophilic piezoelectric polyacrylonitrile (PAN)-barium titanate (BTO) nanofibers. The unidirectional moisture-wicking performance based on the hydrophilic-hydrophobic gradient of PVDF/ZnO-PAN/BTO nanofiber membranes (PZ-PBNF) could conduct liquid within 1 s. Incorporating inorganic ZnO and BTO nanoparticles provides a practical approach to enhancing the piezoelectric output performance (277.5 mV). These fibrous PZ-PBNF membranes also exhibit excellent stretchability properties (breaking elongation of 110%) and air permeability (12.065 mm/s). This innovative electronic skin with directional water transport and sensing functions could ensure long-term wear comfort for practical application in emerging wearable technologies and all healthcare ranges.

中文翻译：

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单向吸湿排汗 PAN/BTO-PVDF/ZnO 全纤维双层透气电子皮肤，用于健康传感


全纤维电子皮肤基于优异的柔韧性和压电性能，可广泛应用于监测和医疗保健传感。应用场景中积聚的水分，就像猛烈的汗水或潮湿的环境一样，会影响压电信号的稳定性和灵敏度。在这里，使用逐层静电纺丝技术制造了双层压电传感器。内层由疏水性压电聚偏二氟乙烯 （PVDF）-氧化锌 （ZnO） 纳米纤维组成，而外层由亲水性压电聚丙烯腈 （PAN）-钛酸钡 （BTO） 纳米纤维组成。基于 PVDF/ZnO-PAN/BTO 纳米纤维膜 （PZ-PBNF） 亲水疏水梯度的单向吸湿性能可在 1 s 内导电。掺入无机 ZnO 和 BTO 纳米颗粒提供了一种提高压电输出性能 （277.5 mV） 的实用方法。这些纤维 PZ-PBNF 膜还表现出优异的拉伸性能（断裂伸长率为 110%）和透气性 （12.065 mm/s）。这种创新的电子皮肤具有定向输水和传感功能，可以确保长期佩戴舒适，适用于新兴可穿戴技术和所有医疗保健领域的实际应用。