Black tea leaf extract derived Ag nanoparticle-PVA composite film: Structural and dielectric properties

► Black tea leaf extracts-PVA/silver nanocomposite (EPSNP) films have been prepared by biogenic synthesis approach. ► The results demonstrated a remarkable enhancement of dielectric permittivity (∼900) with low loss (∼0.14). ► Electrical conductivity as high as 5.98 × 10−5 S/m for15 EPSNP composite film at 1 kHz and room temperature. ► Such nanocomposite film might be important for technological applications.