Ultralight Ti3C2Tx MXene foam with superior microwave absorption performance

Light weight is one significant pursuit for microwave absorption (MA) materials. Generally, constructing foams with porous structure and low density as the absorber efficient way to reduce content quality of MA materials since can effectively cause multiple reflections electromagnetic waves enhance performance. Herein, we report a new simple method fabricating ultralight Ti3C2Tx by hydrochloric acid induced self-assembly freeze-drying, which pore performance be regulated pre-freezing temperature. The decrease temperature from −20 °C −196 results in reduced size, more homogenous structure, decreased electrical conductivity, dielectric constant significantly enhanced 3.3 wt% was immersed into molten paraffin prepare composites tests. Due synergy reflection, conductive loss polarization relaxation, pre-frozen at shows most superb impressive performance, minimum reflection (RL) −50.6 dB thickness 1.8 mm an effective bandwidth (EAB) 4.2 GHz (13.8–17.6 GHz) 1.4 mm, EAB could adjusted range 11.9 (6.1–18 increasing 1 3 mm. This lightweight excellent our knowledge, perfectly meet combined light weight, thin thickness, broad strong absorption. work offers strategy 3D Ti3C2Tx-based facing application such MA, shielding, environmental governance, energy storage sensors.