PDMS sponge-based strain sensor and preparation method thereof

The invention belongs to the field of flexible electronic materials, and particularly relates to a PDMS sponge-based strain sensor and a preparation method thereof.The preparation process comprises the steps that taking cube sugar as a sacrificial template to prepare PDMS sponge, subjecting the surface of PDMS to plasma treatment modification, then soaking the PDMS sponge in a polyvinyl alcohol-acid water solution, squeezing to remove the excess solution for drying, then curing; and drying to obtain a conductive modified PDMS sponge strain sensor material, and clamping the conductive modified PDMS sponge strain sensor material between two flexible electrodes to prepare the strain sensor. According to the strain sensor, the resistance can be obviously changed in tiny compression strain, meanwhile, the strain sensor has good cyclic compression release stability, tiny deformation generated by pulses can be responded, the preparation process is simple and easy to operate, and the strain sensor has wide applicatio