<i>In‐situ</i> fabrication of barium titanate@polyvinyl pyrrolidone in polyvinylidene fluoride polymer nanocomposites for dielectric capacitor applications
Prateek Prateek, Ritamay Bhunia, Shashikant Gupta, Ashish Garg, Raju Kumar Gupta
Abstract
Abstract We have demonstrated an in situ route to design barium titanate (BT)@polyvinyl pyrrolidone (PVP) nanoparticles (NPs) in PVP/polyvinylidene fluoride (PVDF) blends. Thus, the PVP simultaneously acted as a linker and a part of the polymer matrix. We have hydrothermally synthesized the tetragonal phase of BT NPs (~150 nm). The BT NPs content was varied from 0 to 15 vol%. The resulting polymer nanocomposites generated enormous interfaces because of homogeneously dispersed BT@PVP NPs. Furthermore, the PVP simultaneously tailored the interfacial properties surrounding the BT NPs and bulk of the polymer matrix. Therefore, we achieved an enhanced maximum polarization ( P max ) and energy density ( U d ) of 27.9 μC cm −2 and 13.4 J cm −3 (2261 kV cm −1 ), respectively, at 7.5 vol% BT NPs loadings. At the same time, PVP/PVDF blends showed P max and U d of only 3.9 μC cm −2 and 4.6 J cm −3 (3369 kV cm −1 ), respectively. This simple approach of in situ nanomaterials modification will lead to development of low‐cost and time‐efficient dielectric capacitors.