Ti₃C₂T_x MXene‐Based Superhydrophobic Broadband Terahertz Absorber with Large Pore‐Size Foam Architecture

Abstract

Porous polymer‐based Terahertz (THz) absorbers possess strong absorption with broadband, lightweight, and flexible features. Thus these are widely desired in THz electromagnetic shielding, radar‐cross‐section reduction, radiometer calibration, etc. However, the harsh environment of humidity, corrosiveness, and dustiness undermines the performance and service lifetime of the porous absorbers. Here, based on Ti3C2Tx MXene sponge composite foam (MSF), a superhydrophobic broadband THz absorber on a large pore‐size porous architecture by a joint hydrophobic strategy is realized. Results show that the apparent contact angles and roll‐off angles of the modified MSF reached 159.0° and 7.6°, while maintaining an ultra‐high absorption rate of 99.6% in the frequency range of 0.3–1.2 THz. Furthermore, the special Micro‐Nano hierarchical structures render the absorber a strong bounce‐off ability to the droplets of an aqueous solution. These water‐repellent properties endow the absorber the versatility of self‐cleaning and anti‐corrosion, thus can be widely applied in many scenarios including THz remote sensing, communication, and security screening as well.

In Situ Laser-Induced 3D Porous Graphene within Transparent Polymers for Encapsulation-Free and Tunable Ultrabroadband Terahertz Absorption

“…In a comparative analysis of broadband terahertz absorbers utilizing diverse fabrication techniques and substrate materials (Table S2), the flexible broadband terahertz-perfect absorber developed in this study exhibits superior absorption bandwidth, outclassing alternatives such as 3D graphene foam, metal-dielectric composites, , multilayer graphene sheets, metallic bar structures, p-type silicon wafers, hybrid graphene-gold metasurfaces, Ti 3 C 2 T x MXene sponge composite foams, , and conducting polymer-cellulose aerogels, as well as other LIG-based broadband absorbers (Figure h) . The presented device not only offers enhanced terahertz absorption and mechanical robustness but also maintains a remarkably broad absorption bandwidth.…”

“…However, aerogel fabrication commonly involves expensive and time-consuming low-temperature processes, limiting their scalability and widespread industrial deployment in sectors such as aerospace and portable electronics. Moreover, postsynthesis treatments are essential to confer hydrophobicity , and antioxidation , properties, reducing the corrosion and oxidation of functional structures in response to external environmental factors. However, this approach is associated with increased complexity and production costs.…”