High dielectric constant acrylic resin based percolative composite with acidified carbon nanotubes intercalation of MXene

It is critical for electromechanical polymer film to have excellent dielectric properties. In this research, two-dimensional MXene (Ti3C2Tx) nanosheets decorated with acidified carbon nanotubes (referred to here as CNT-COOH@Ti3C2Tx) were used as conductive fillers to prepare high dielectric constant acrylic resin elastomer (AE)-based percolative composite films. Physical blends of Ti3C2Tx and AE (Ti3C2Tx/AE) and CNT-COOH@Ti3C2Tx/AE composite films with different volume fraction fillers were prepared by solution casting method, and their percolation thresholds (fc) were 1.38 vol% and 1.51 vol%, respectively. At 102 Hz, the dielectric constant of 1.42 vol% CNT-COOH@Ti3C2Tx/AE is 120, which is 1.29 times that of 1.26 vol% Ti3C2Tx/AE and 30 times that of AE. At the same time, the dielectric loss of 1.42 vol% CNT-COOH@Ti3C2Tx/AE remains at a relatively low level (0.15 at 102 Hz). The significant increase in the dielectric constant of the composite is closely related to the miniature capacitor effect and interfacial polarization effect.