Ultrabroad band microwave absorption from hierarchical MoO3/TiO2/Mo2TiC2T x hybrids via annealing treatment

Abstract

Abstract 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, MoO3/TiO2/Mo2TiC2T x hybrids were prepared by the annealing-treated Mo2TiC2T x MXene and uniform MoO3 and TiO2 oxides in-situ grew on Mo2TiC2T x layers. At the annealing temperature of 300 °C, the minimum reflection loss (RLmin) value of MoO3/TiO2/Mo2TiC2T 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 Mo2TiC2T x . Considering the excellent overall performance, the MoO3/TiO2/Mo2TiC2T x hybrids can be a promising candidate for EMA.

Keywords

• MoO3/TiO2/Mo2TiC2T x composites
• Mo2TiC2T x MXene
• electromagnetic wave absorption (EMA)
• impedance matching
• interfacial polarization
• dielectric loss