材料科学
微波食品加热
介电损耗
吸收(声学)
多孔性
反射损耗
复合材料
电介质
光电子学
化学工程
复合数
计算机科学
电信
工程类
作者
Jiaqi Tao,Ruiyang Tan,Linling Xu,Jintang Zhou,Zhengjun Yao,Yiming Lei,Ping Chen,Li Zhong,Jian Zhen Ou
标识
DOI:10.1002/smtd.202200429
摘要
Abstract Hollow metal‐organic frameworks (MOFs) with careful phase engineering have been considered to be suitable candidates for high‐performance microwave absorbents. However, there has been a lack of direct methods tailored to MOFs in this area. Here, a facile and safe Ni 2+ ‐exchange strategy is proposed to synthesize graphite/CoNi alloy hollow porous composites from Ni 2+ concentration‐dependent etching of Zeolite imidazole frame‐67 (ZIF‐67) MOF and subsequent thermal field regulation. Such a special combination of hollow structure and carefully selected hybrid phase are with optimized impedance matching and electromagnetic attenuation. Especially, the suitable carrier transport model and the rich polarization site enhance the dielectric loss, while more significant hysteresis loss and more natural resonance increase the magnetic loss. As a result, excellent microwave absorbing (MA) performances of both broadband absorption (7.63 GHz) and high‐efficiency loss (‐63.79 dB) are obtained. Moreover, the applicability and practicability of the strategy are demonstrated. This work illustrates the unique advantages of ion‐exchange strategy in structure design, component optimization, and electromagnetic regulation, providing a new reference for the 5G cause and MA field.
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