In-situ anchoring of Fe3O4/ZIF-67 dodecahedrons in highly compressible wood aerogel with excellent microwave absorption properties

作者：Lulu Xu, Ye Xiong, Baokang Dang, Zhangning Ye, Chunde Jin, Qingfeng Sun, Xiaohong Yu · 发表于：Materials & Design · 年份：2019 · DOI：10.1016/j.matdes.2019.108006 · 被引用次数：165 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies、Metamaterials and Metasurfaces Applications

Lightweight aerogels with superior cavities have attracted great interest in the field of electromagnetic wave absorbing materials. In this work, a hierarchical porous wood aerogel modified with Fe3O4/ZIF-67 (Fe3O4/[email protected]) with high compressibility and low-density was fabricated by in-situ anchoring of magnetic Fe3O4/ZIF-67 rhombohedral dodecahedron in naturally delignified wood aerogel. Combining the advantages of both aerogels and magnetic Fe3O4/ZIF-67 particles, Fe3O4/[email protected] reveals excellent compression-resilience and efficient microwave absorption performance. It possesses a maximum reflection loss (RL) of about −23.4 dB at a low thickness of 1.5 mm and a specific electromagnetic shielding effectiveness of up to ~156.3 dB cm3 g−1. Moreover, the composites exhibit a broad absorption bandwidth under an ultrahigh frequency of 13.5–18.0 GHz. In view of those excellent absorbing effects, the prepared green magnetic Fe3O4/[email protected] is likely to be used as a lightweight shielding material against electromagnetic radiation, especially for smart building and miniaturized device applications.