Regulation mechanism for the formation and microwave absorbing performance of CNT/CoFe-MOF derived hierarchical composite

International Journal of Smart and Nano Materials

Jun Yang¹  Jinxiao Wang²  Jianfeng Yang² 

[1] School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, P. R, China;State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, P. R, China;

关键词: Regulation mechanism;    heat treatment process;    homogeneous distribution;    bonding modes;   

DOI  :  10.1080/19475411.2022.2070681

来源: DOAJ

【 摘 要 】

The structure design, performance analysis, and process optimization of CNT/MOF-derived hierarchical composite play an important role in the development of high-performance microwave absorbing materials. Herein, the preparation, morphology evolution, and electromagnetic wave absorption mechanism of CNT/MOF-derived hierarchical composite were systematically investigated. The regulation mechanism was revealed by studying the changes in the morphological characteristics, electromagnetic properties, and microwave absorbing performance of CNT/MOF-derived hierarchical composite under different process parameters. The results show that the morphological characteristics and interface bonding between CNT and MOF have a great impact on the absorptive capacity. The composite with composition of 0.28Co/0.26Fe has a maximum absorption of −46 dB at 8.6 GHz and a thickness of 4 mm. In addition, the absorption band with reflection loss values of less than −20 dB can be operated with this thickness between 7.15 and 10.18 GHz, showing excellent absorbing ability and electromagnetic wave bandwidth. The regulation mechanism of CNT/MOF-derived hierarchical composite mainly depends on the effect of Lorentz force, the ion disorder of CoO-Fe2O3 heterojunction, and the spin polarization mechanism of free electrons. This study further improves the corresponding theoretical basis and new design principles, which provides technical support for the development of high-performance absorbing materials.

【 授权许可】

Unknown