Ultrabroad band microwave absorption from hierarchical MoO3/TiO2/Mo2TiC2Tx hybrids via annealing treatment

Two-dimensional (2D) transition metal carbide MXene-based materials hold great potentials applied for new electromagnetic wave (EMW) absorbers. However, the application of MXenes in the field of electromagnetic wave absorption (EMA) is limited by the disadvantages of poor impedance matching, single loss mechanism, and easy oxidation. In this work, MoO 3 /TiO 2 /Mo 2 TiC 2 T x hybrids were prepared by the annealing-treated Mo 2 TiC 2 T x MXene and uniform MoO 3 and TiO 2 oxides in-situ grew on Mo 2 TiC 2 T x layers. At the annealing temperature of 300 °C, the minimum reflection loss (RL min ) value of MoO 3 /TiO 2 /Mo 2 TiC 2 T x reaches −30.76 dB (2.3 mm) at 10.18 GHz with a significantly broadening effective absorption bandwidth (EAB) of 8.6 GHz (1.8 mm). The in-situ generated oxides creating numerous defects and heterogeneous interfaces enhance dipolar and interfacial polarizations and optimize the impedance matching of Mo 2 TiC 2 T x . Considering the excellent overall performance, the MoO 3 /TiO 2 /Mo 2 TiC 2 T x hybrids can be a promising candidate for EMA.