材料科学
静电纺丝
聚偏氟乙烯
制作
钛酸钡
压电
压力传感器
膜
电压
复合材料
纳米纤维
纳米技术
光电子学
聚合物
陶瓷
机械工程
电气工程
医学
替代医学
病理
工程类
生物
遗传学
作者
Haoyu Kong,Yuan Jin,Guangyong Li,Minghua Zhang,Jianke Du
标识
DOI:10.1002/adem.202201660
摘要
Herein, a simple and low‐cost fabrication method for flexible piezoelectric pressure sensors with hierarchical structures over large areas is presented. First, polyvinylidene fluoride (PVDF) and barium titanate (BaTiO 3 , BTO) composite membranes are fabricated through near‐field electrospinning, and the hierarchical structured membrane (HSM) is obtained by spreading the flat membrane on the designed mold and drying. Then, the effect of encapsulation schemes on the piezoelectric properties of the sensor is investigated by combining different membranes with different PDMS substrates. The output voltage under periodic loads shows that the encapsulation scheme of “the hierarchical structured membrane with a hierarchical structured substrate” (HHS) can provide the highest peak voltage attributed to its largest contact area, which increases the active area (deformation area) for piezoelectricity generation. Also, the HHS with a bulge of 2 mm can produce a maximum output voltage of 2.32 V under a periodic load of 2 N, 2.5 Hz. Finally, the HHS pressure sensors are used for monitoring human motions, including joint bending, walking, and jumping, and the results show that the presented hierarchically microstructured flexible piezoelectric pressure sensor has great potential for applications of for human‐activity monitoring and wearable bioelectronic devices.
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