Influence of inter structure of BaTiO3-carbon nanotube hybrid particles on the dielectric properties of PDMS nanocomposites

In this study, two kinds of hybrid particles named as BT@CNT and CNT@BT were prepared by chemical bonding between barium titanates and two types of carboxyl-functionalized multi-walled carbon nanotubes with different structural parameters in the presence of silane as a coupling agent. The effects of structures of hybrid particles on microstructure and dielectric performance of the obtained composites were studied. Herein, the BT@CNT hybrid filler aids in improving the dielectric permittivity and the CNT@BT hybrid filler has a main advantage in suppressing the dielectric loss (Dielectric permittivity 300–573 and loss 39.5–6.9 for BT@CNT/PDMS, Dielectric permittivity 65–120 and loss 1.5–0.75 for CNT@BT/PDMS at 100 Hz). Additionally, the dielectric performances of the composites can be manipulated by controlling the hybrid fillers structure and the hybrid ratio. In sum, this work looks promising for the fabrication of property-tailored materials for wide applications in electrostatic capacitors, embedded devices and charge storage device in future.