Coral-like carbon-based composite derived from layered structure Co-MOF-71 with outstanding impedance matching and tunable microwave absorption performance  

作　　者：Panpan Zhou Meng Wang Zhi Song Yongkang Guan Lixi Wang Qitu Zhang 

机构地区：[1]College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China [2]Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,China

出　　处：《Journal of Materials Science & Technology》2022年第13期10-17,共8页材料科学技术（英文版）

基　　金：the financial support from the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：Metal-organic frameworks(MOFs)are considered as a novel type of microwave absorption(MA)material owing to the sufficient pore structure,diverse configurations,and easy-to-control magnetic properties.However,their evolution is limited by the imperfect impedance matching conditions caused by the undesirable microstructure.Herein,two types of novel porous coral-like carbon/Co_(3)O_(4)and carbon/Co composites have been effectively fabricated for the first time by a facile heat treatment process of precursor Co-MOF-71.The graphitization degree,magnetic property and MA ability of the product can be effortlessly tuned by altering the heat treatment temperature of Co-MOF-71.Remarkably,S500(Co-MOF-71 calcined at 500℃)composite displays strong and multi-frequency absorption performance,whose minimum reflection loss(RL)value achieves-36.4 d B with an absorbing thickness of 3.0 mm and attains an effective absorbing bandwidth(RL≤-10 dB)of 5.76 GHz(almost covers whole Ku band)at a thinner coating thickness of 2.5 mm.Such superb MA ability has roots in the coral-like structure derived from the layer Co-MOF-71,sufficient electromagnetic loss.This work ameliorates the MA ability of MOFs through a special nanostructural design,which provides a fresh way for the preparation of novel MA materials.

关 键 词：Co-MOF-71 Coral-like structure Ku band Magnetoelectric synergy Electromagnetic absorption 

分 类 号：TB34[一般工业技术—材料科学与工程]