Novel designed core–shell nanofibers constituted by single element-doped BaTiO3 for high-energy–density polymer nanocomposites

Core–shell nanofillers designed for dielectric nanocomposites are expected to integrate high relative permittivity (εr) and breakdown strength (Eb). However, conventional core–shell nanofillers exhibit two major drawbacks: (i) the low-εr shell greatly limits the εr of the entire nanofiller, and (ii) the differences of calcination performance and lattice constant between the core and shell materials induce extra imperfections, which can cause...