Selective coding dielectric genes based on proton tailoring to improve microwave absorption of MOFs

作者：Jiaqi Tao, Linling Xu, Haoshan Jin, Yansong Gu, Jintang Zhou, Zhengjun Yao, Xuewei Tao, Pïng Chen, Dinghui Wang, Zhong Li, Hongjing Wu · 发表于：Advanced Powder Materials · 年份：2022 · DOI：10.1016/j.apmate.2022.100091 · 被引用次数：119 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies

Regulating dielectric genes of hollow metal-organic frameworks is a milestone project for microwave absorption (MA). However, there is still a bottleneck in deciphering the contribution of various dielectric genes, making it hard to expand the MA potential from selective encoding gene sequences. Herein, a custom-made proton tailoring strategy is used to build a controllable cavity, and meticulously designed thermodynamic regulation promotes the rearrangement of carbon atoms from disorder to order, thus enhancing the characteristics of charge transfer. Meanwhile, the defect-configuration transformation from heteroatom to vacancy and geometric configuration of hollow structure increase the polarization-related dielectric genes. Therefore, MA performance is enhanced towards broadband absorption (6.6 GHz, 1.78 mm) and high-efficiency loss (−62.5 dB), making samples suitable for complex open electromagnetic environments. This work realizes the tradeoff between dielectric gene sequences and provides a profound insight into the functions and sources of various microwave loss mechanisms.