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Conductance Reinforced Relaxation Attenuation with Strong Metal-N Coordination in Multivariate π-Conjugated MOFs for
Yongheng Jin1,2, Junye Cheng1, Shan Jiang1
1Department of Materials Science, Shenzhen MSU-BIT University, Shenzhen, 517182, China.
Abstract:
π-conjugated metal-organic frameworks (MOFs) have emerged as promising candidates for electromagnetic wave (EMW) absorption, owning to their high conductivity and versatile structural tunability. Nevertheless, the effective control over their dielectric properties is a challenge. Herein, the charge carrier migration in π-conjugated MOFs is harnessed to significantly amplify the electromagnetic response, where the strengthened atom coordination can activate a distinctive conductance-reinforced attenuation mechanism. This results in finely calibrated EMW absorption characteristics, including a wide effective absorption bandwidth of 6.0 GHz at mere 2 mm, a minimum reflection loss of -46.7 dB at 3.5 mm, and a substantial reduction in radar cross-section (RCS) up to -23.3 dBm2. Furthermore, the seamless integration of the π-conjugated MOF hybrids within ultraviolet (UV)-curable 3D printing technology has enabled the fabrication of a stealth-enabled drone propeller prototype, which exhibits a remarkably low infrared emissivity of 0.205. Additionally, when the propeller device is subjected to a 100 °C heating platform for 30 min, its surface temperature remains below 50 °C, demonstrating exceptional thermal management and stability under elevated temperature conditions. This work underscores the immense potential of these cutting-edge absorbers to shape the future of advanced military stealth technologies.
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