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

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Smart and Nano Materials Pub Date : 2022-04-03 DOI:10.1080/19475411.2022.2070681

Jinxiao Wang, Jianfeng Yang, Jun Yang

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引用次数: 3

Abstract

ABSTRACT 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. Graphical abstarct

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CNT/CoFe-MOF分级复合材料的形成及其微波吸收性能的调控机制

CNT/ mof层叠复合材料的结构设计、性能分析和工艺优化对高性能吸波材料的开发具有重要意义。本文系统地研究了CNT/ mof层次化复合材料的制备、形貌演变及电磁波吸收机理。通过研究不同工艺参数下CNT/ mof衍生层叠复合材料的形态特征、电磁性能和微波吸收性能的变化，揭示了其调控机理。结果表明，碳纳米管与MOF之间的形态特征和界面键合对吸收能力有很大影响。0.28Co/0.26Fe的复合材料在8.6 GHz处的最大吸收为- 46 dB，厚度为4 mm。此外，在7.15 ~ 10.18 GHz的厚度范围内，可以工作在反射损耗值小于- 20 dB的吸收带，具有良好的吸收能力和电磁波带宽。CNT/ mof衍生层叠复合材料的调控机制主要取决于洛伦兹力的作用、co - fe2o3异质结的离子无序性以及自由电子的自旋极化机制。本研究进一步完善了相应的理论基础和新的设计原理，为高性能吸波材料的开发提供了技术支持。图形abstarct

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来源期刊

International Journal of Smart and Nano Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.30

自引率

5.10%

发文量

审稿时长

11 weeks

期刊介绍： The central aim of International Journal of Smart and Nano Materials is to publish original results, critical reviews, technical discussion, and book reviews related to this compelling research field: smart and nano materials, and their applications. The papers published in this journal will provide cutting edge information and instructive research guidance, encouraging more scientists to make their contribution to this dynamic research field.