Improving dielectric constant and breakdown strength of CaCu3Ti4O12/millable polyurethane composite films with Ti3C2Tx MXene

Flexible dielectrics with exceptional dielectric properties are highly desirable for various electronic applications. In this study, we successfully fabricated CaCu 3 Ti 4 O 12 (CCTO)/Ti 3 C 2 T x MXene/millable polyurethane (MPU) ternary composite films via a combination of mixing and hot compression techniques. The incorporation of 2D Ti 3 C 2 T x MXene nanosheets at a mass fraction of 4 % significantly enhanced the dielectric properties of the composite films. Specifically, the dielectric constant at 100 Hz increased to 41.1, representing a 14.48 % improvement over the initial CCTO/MPU composite. Meanwhile, the dielectric loss remained low at 0.050, with only a marginal increase of 2.04 %. Additionally, the breakdown strength of the composite films was notably boosted to 19.15 kV/mm, demonstrating a 15.3 % enhancement. These findings highlight the substantial improvement in the dielectric performance of the CCTO/Ti 3 C 2 T x /MPU ternary composite films, showcasing their potential for high-performance electronic applications.