Simulation and comprehensive performance test results of micro-structured m-BNNS/PDMS composite films. (a) The output piezoelectric simulation results of the composite film before and after the micro-structure (structure: side length 50 μm, height 50 μm); (b) the piezoelectric response signals of FR_BNNS, FA_BNNS, SR_BNNS, and SA_BNNS were compared in the range of 0.5%‒2% BNNS mass fraction; (c) the linear relationship between the load and the piezoelectric response of the SA_BNNS composite film with BNNS mass fraction of 1.5 %;(d) frequency response test and (e) durability and stability test of SABNNS composite films.