<p>➀ This study explores a novel method to enhance the β-phase content in polyvinylidene fluoride (PVDF) composites by in situ growth of silver(I) fluoride (AgF) and silver oxide (Ag2O) nanoparticles.;</p><p>➁ The goal is to improve the electrical performance of composite films for piezoelectric nanogenerators in energy-harvesting applications.</p><p>➂ The method significantly increases β-phase content and improves dielectric and piezoelectric properties.</p>