High permittivity polymer embedded with Co∕ZnO core/shell nanoparticles modified by organophosphorus acid

The Co∕ZnO core/shell nanoparticles-filled polymer poly(vinylidene fluoride) (PVDF)-based composites (0-3 connectivity) are fabricated, in which the core/shell structure for preventing Co particles from agglomeration is prepared by a simple wet chemistry procedure. At the same time, the N,N-di(phosphonomethyl)iminoacetic acid (DPMIAA) is used to modify the core/shell surface. High dielectric permittivity and low leakage current are achieved for the DPMIAA-modified Co∕ZnO core/shell nanoparticle-PVDF composite, which shows good homogeneity, no cracks, and fine mechanical flexibility.