Flexible piezoresistive strain sensors are smart materials used for sensing applications. In the present work, a flexible piezoresistive strain sensor was developed by infiltrating acidic ionic liquid (IL) [BMIM HSO₄] in poly (vinylidene fluoride) (PVDF) polymer using a solvent casting technique. The use of IL leads to the generation of pores of uniform shape at lower concentrations (~10 wt%), thus enhancing mechanical flexibility by allowing more space to stretch. Furthermore, the pores contained IL inside, providing extra ions for charge conduction, thus improving the sensitivity of the material. Maximum flexibility and gauge factor of 5.29 were obtained for ratio 5 to 10 wt% of IL. Maximum elasticity was obtained for ratio IL/PVDF (5:95) in comparison to pure PVDF. An increase in dielectric constant and conductivity was observed for samples containing IL. The most important part of IL can be reused and shows biocompatible behavior. The developed system showed a more flexible, durable, and repeatable performance for strain sensing applications for human and structural health monitoring.

柔性压阻应变传感器是用于传感应用的智能材料。在目前的工作中，通过渗透酸性离子液体（IL）[BMIM HSO ₄使用溶剂浇铸技术在聚偏二氟乙烯（PVDF）聚合物中合成]。IL的使用导致在较低浓度（〜10 wt％）时产生均匀形状的孔，从而通过允许更大的拉伸空间来增强机械柔韧性。此外，孔内部含有IL，为电荷传导提供了额外的离子，从而提高了材料的灵敏度。对于5-10wt％的IL，获得最大的柔韧性和5.29的规格系数。与纯PVDF相比，IL / PVDF（5:95）比可获得最大弹性。对于包含IL的样品，观察到介电常数和电导率增加。IL的最重要部分可以重复使用并显示出生物相容性行为。开发的系统显示出更加灵活，耐用，