Citation:
Qiang Wang, Jifan Yang, Xiaolei Su, Yi Liu. La2O3 decorated Ti3C2Tx MXene: temperature regulation and frequency selective surface synergy for enhanced X-Band microwave absorption[J]. Acta Physico-Chimica Sinica,
;2026, 42(8): 100308.
doi:
10.1016/j.actphy.2026.100308
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MXene possesses high dielectric loss and a distinctive layered structure, yet its single-component characteristic gives rise to intense electromagnetic wave reflection, which severely restricts its microwave absorption efficiency. In this study, La2O3@Ti3C2Tx nanocomposites were fabricated by immobilizing La2O3 nanoparticles onto exfoliated Ti3C2Tx nanosheets via amino-bond linkage, with temperature adopted as a pivotal parameter to modulate the absorption performance. Ti3C2Tx was derived from the Ti3AlC2 precursor through LiF-assisted wet etching, ultrasonication and centrifugation. The phase composition and microstructure of the composites were characterized by XRD, SEM and TEM, while their electromagnetic parameters in the X-band were measured using a vector network analyzer. The optimal absorption performance was attained at a temperature of 60 ℃. At a thickness of 3.8 mm, the minimum reflection loss reaches -50.5 dB at 9.2 GHz, and the effective absorption bandwidth fully covers the X-band (8.2–12.4 GHz). Furthermore, the microwave absorption performance is further optimized by simulating the loaded frequency selective surface, with the reflection loss in the X-band all below -10 dB at a thickness of 3.2 mm. Mechanistic analysis based on electromagnetic field simulation confirms that the exceptional absorption behavior originates from LC resonance. This work provides a novel and feasible strategy for designing and fabricating high-performance Ti3C2Tx-based microwave absorbing materials, which shows promising application prospects in the field of electromagnetic protection.
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