Preparation and dielectric properties of multilayer Ag@FeNi-MOF/PVDF composites

Ag@FeNi-MOF/PVDF multilayer polymer nanocomposites with high dielectric properties were designed and prepared in this paper, and their theoretical simulation was carried out through COMSOL Multiphysics 5.4, which verified the advantages of multilayer structure design. Ag@FeNi-MOF two-dimensional hybrid nanosheets were prepared by hydrothermal reaction in the experiment, which were doped into PVDF matrix as fillers to obtain monolayer films, and then combined with pure PVDF film by hot pressing to achieve multilayer structure. The results showed that the multilayer structure could effectively improve the energy storage density and breakdown field strength. When the number of film layers were 1, 3, 5 and 7, the energy storage density were 8.01, 8.482, 8.822 and 9.467 J/cm3, and the breakdown field strength were 2239, 2500, 2700 and 2850 kV/cm. Compared with layer 1, the energy storage density of layer 7 increased by 18.1%, and the breakdown field strength increased by 27.3%. This study proved that the multilayer structure design had positive significance in improving the dielectric properties of polymer nanocomposites.