一种定制电磁吸收光谱的高熵策略：从GHz到THz的宽频吸波材料

doi:10.1016/j.actphy.2026.100434

Abstract

Abstract: The rapid advancement of 5G communications, radar, and terahertz (THz) technologies has spurred an urgent demand for electromagnetic (EM) wave absorbing materials with high absorption efficiency and superior stability. MXenes have attracted significant attention due to their excellent conductivity and tunable dielectric properties. However, conventional MXenes are limited to single or dual transition metal compositions, restricting their functional diversity. Herein, we reported two kinds of quaternary high-entropy MXenes (TiVCrMoC₃T_x and TiVNbMoC₃T_x) along with their corresponding MAX phase precursors. Monolayer high-entropy MXene nanosheets were successfully synthesized via combined acid etching and intercalation exfoliation, and their EM absorption performance was systematically investigated across GHz-THz bands. Theoretical calculation coupled with terahertz spectroscopy reveal that strategic Cr/Nb alloying selectively reconstructs electronic states at the Fermi level, achieving tunable EM absorption characteristics. Remarkably, TiVCrMoC₃T_x achieved remarkable reflection loss (RL) of -60.2 dB at 1.50 mm thickness with an effective absorption bandwidth (EAB) of 4.00 GHz due to enhanced dielectric loss, while TiVNbMoC₃C₃T_x exhibits an RL of -44.26 dB at 2.50 mm and an EAB of 5.61 GHz at 2.00 mm. Both materials demonstrate near-ideal THz-band absorption and low reflectivity. This study not only expands the frontiers of high-entropy materials for EM absorption but also establishes fundamental principles for EM shielding, interference suppression, and stealth applications.

Key words: Electromagnetic wave absorbing, Terahertz technology, High-entropy MXenes, Dielectric loss

Yu Wang, Wenxuan Wang, Lin Chu, Mo Chen, Yaru Qiu, Yaqian Zhang, Dejun Liu, Di Lan, Dong Liu, Baoguo Zhang. A high-entropy strategy for customizing electromagnetic absorption spectra: from GHz to THz broadband absorbers[J]. Acta Phys. -Chim. Sin. 2026, (), 100434. doi: 10.1016/j.actphy.2026.100434

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A high-entropy strategy for customizing electromagnetic absorption spectra: from GHz to THz broadband absorbers

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