In this study, a PVDF - AlN - Yttrium (Y3+) tri-composite nanofibrous system was developed through sol - gel-assisted electrospinning to enhance beta-phase nucleation and piezoelectric energy conversion. The novelty of the work lies in the complementary use of 10 wt% AlN nanoparticles and 5 wt% Y3 + species within the PVDF matrix, where AlN promotes heterogeneous nucleation and interfacial polarization, while Y3 + induces ion - dipole interactions with - CF2 dipoles. Annealing at 140 degrees C followed by corona poling at 26 kV and 80 degrees C further stabilized the electroactive beta-phase. FTIR and XRD analyses confirmed 84.13% beta-phase fraction and 72% crystallinity for the optimized PA10%Y5% composition. FESEM observations revealed dense, bead-free, and uniform nanofiber morphology with improved filler dispersion. The optimized nanocomposite exhibited a d(33) value of 28 pC/N, dielectric constant of 17, open-circuit AC voltage of 17.6 V, and short-circuit current of similar to 140 & micro;A, corresponding to a maximum AC power output of similar to 595 & micro;W. After rectification, the device delivered similar to 11.77 V DC and similar to 286 & micro;W maximum DC power. The silicone-encapsulated PVDF - AlN - Y3 + nanocomposite demonstrates potential for flexible low-frequency biomedical energy-harvesting applications.
