Terahertz (THz) absorption technology is promising in radar stealth, electromagnetic interference (EMI) shielding, and the upcoming 6G communication. However, the most popular metamaterial‐based THz absorbers suffer from complex fabrication process and/or narrowband characteristics. Here, a broadband, lightweight, and hydrophobic THz absorber is realized based on Ti₃C₂T_x MXene sponge foam (MSF) that is obtained by using a dip‐coating method. Due to the macroscopic impedance matching to free space and various microscopic morphologies of metallic Ti₃C₂T_x flakes inside porous architecture, the obtained MSF, with only 2 mm thickness, shows almost no THz reflection (minimum ≈ 0.00003%) and high THz absorption over 99.99% under the 100% qualified frequency bandwidth ranging from 0.3 to 1.65 THz. The new strategy of combining large‐pore‐size porous architecture with MXene‐like 2D metallic flakes paves a way to achieving high performance THz absorber with minimal thickness, which is of significance in electromagnetic stealth, shielding, and beyond.

中文翻译：

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Ti3C2Tx MXene海绵复合材料用作宽带太赫兹吸收剂

太赫兹（THz）吸收技术在雷达隐身，电磁干扰（EMI）屏蔽以及即将到来的6G通信中很有前途。但是，最流行的基于超材料的太赫兹吸收器受制于复杂的制造过程和/或窄带特性。在这里，基于Ti ₃ C ₂ T _x MXene海绵泡沫（MSF）实现了宽带，轻便和疏水的THz吸收剂，该材料是通过浸涂法获得的。由于与自由空间匹配的宏观阻抗以及金属Ti ₃ C ₂ T _x的各种微观形态在多孔结构的片状结构中，所获得的MSF厚度仅为2 mm，在0.3％至1.65 THz的100％合格频率带宽下，几乎没有THz反射（最小≈0.00003％）和99.99％的高THz吸收。将大孔径多孔结构与类似MXene的2D金属薄片相结合的新策略，为实现具有最小厚度的高性能THz吸收器铺平了道路，这在电磁隐身，屏蔽及其他方面具有重要意义。