Polymer composites with Au@Ag/BaTiO3 nanofibers towards synergistic enhancement of dielectric constant and breakdown strength

The development of advanced electronic equipment provides new opportunities for the application of polymer films. However, polymer films are constrained by their relatively low energy storage density. To overcome this challenge, Au@Ag/BaTiO 3 nanofibers with different sputtering time are designed and prepared by the electrospinning and sputtering method. Experimental results show that the metal nanoparticles improve the charge storage capacity of the polymer and greatly elevate the dielectric constant. The limitation of charge carriers by the minuscule metal nanoparticles considerably increases the breakdown strength. Au@Ag/BaTiO 3 /P(VDF-HFP) composite film achieved the maximum discharge energy density of 13.93 J cm −3 at 655 kV mm −1 , which represents a 124% increase compared to P(VDF-HFP). This contribution provides a new and feasible direction for ceramic nanofibers to optimize the energy storage capacity of composite films in dielectric capacitors.