Silica decorated with Ti3C2Tx nanosheets for reinforcing epoxy resin dielectric properties and energy density

Advances in electronic technology and power devices have placed increased demands on the performance of polymer dielectrics . The preparation of dielectric polymer composites with high dielectric constant and breakdown strength remains a critical challenge. Herein, SiO 2 @Ti 3 C 2 T x hybrids were prepared by decorating few-layer Ti 3 C 2 T x nanosheets on the surface of modified silica nanospheres by electrostatic self-assembly method. A series of EP/SiO 2 @Ti 3 C 2 T x composites were prepared by using the heterohybrids as fillers, and the composites demonstrated the enhanced dielectric constant and breakdown strength. After filling with 7 wt% of SiO 2 @Ti 3 C 2 T x , the dielectric constant of the composite was 4.25. At this point, the breakdown strength of the composite is 41.6 kV/mm, and the dielectric loss at 1 kHz is 0.005. The improved performance of epoxy resin-based composites can be attributed to the fact that Ti 3 C 2 T x nanosheets contain surface hydroxyl groups capable of improving the dispersion of fillers in epoxy resin, while the addition of Ti 3 C 2 T x nanosheets improves the interfacial polarization behavior. The reasonably designed nano-hybrid filler has broadened the application of polymer dielectric in energy storage, power equipment and other engineering fields.