An Ag Decorated P(VDF-CTFE)/BT@HBP@PDA Nanocomposites with Double-Shell Core Structure for High Dielectric Performance

A core-shell inorganic/polymer materials with abundant compositions and multiple shapes have attracted many attentions recently for their harmonious interfacial compatibility, high dielectric performance, and thereby the prospect of applications in energy storage devices. In this work, for improving the interfacial compatibility of in organiclpolymer nanocomposites, the BaTiO₃ (BT) nano-powders are coated successively by using double shell polyamide (HBP) and dopamine (PDA) that is decorated with nanoscale Ag particles. In addition, a P(VDF-CTFE) with high breakdown electric field and proper dielectric permittivity are selected as the polymer matrix, and the flexible 0-3 nanocomposite of Ag decorated P(VDF-CTFE)/BT@HBP@PDA films with 20μm in thickness are obtained through spin-casting method. The morphologies from FESEM show that the interface between BaTiO₃ and P(VDF-CTFE) has been improved significantly and BaTiO₃ is homogeneous dispersion in the polymer matrix. Consequently, the multicomponent nanocomposites possess the large dielectric permittivity (ϵ_r40) and a low dielectric loss tangent (0.1 Hz) since the ionic polarization of BaTiO₃ and the penetration effect of electrons. The result provides an effective way of interfacial improving that through various mutual promoting mediums to achieve high dielectric performance composite materials for their potential applications in energy storage areas.