Microwave absorption properties of one-step formed CNTs/Fe3O4-carbonyl iron superflexible buckypaper by directional pressure filtration

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-05 DOI:10.1016/j.ceramint.2024.10.025

Yanzhi Cai , Haiming Yu , Laifei Cheng , Yibing Yuan , Siyu Guo , Zhongyi Hu , Yuhan Wang , Dengpeng Chen , Jianing Liu , Hudie Yuan

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引用次数: 0

Abstract

In order to realize the integration of structure and function of microwave-absorbing materials, carbon nanotubes/magnetic nanoparticle buckypaper (CNT/MNP BP) self-supporting, ultra-flexible, ultra-thin and ultra-light composites were prepared by composing CNTs with MNPs through directional pressure filtration technology. The BP composite, with a bulk density of 0.62 g/cm³ and a thickness of 0.21 mm, can be uninterruptedly tightly wound around a 4 mm diameter glass rod many times without structural damage. The microwave-absorbing properties and magnetic properties of the CNT/MNP composites with different compositions and contents were systematically analyzed. The CNT-Fe₃O₄ Buckypaper with 33.3 wt% Fe₃O₄ content (CF_33.3 %) has the best electromagnetic wave absorption capability, with a minimum reflection loss value of −52.01 dB and an effective absorption bandwidth of 4.08 GHz. The VSM test shows that the saturation magnetization strength of CF_33.3 % is 38.4 emu/g. The excellent electromagnetic wave absorption performance is attributed to the polarization and conduction losses of CNTs, natural resonance, exchange resonance and eddy current losses of MNPs, and multiple scattering and reflection within the porous network structure of the composites. The CNTs and MNPs has good dispersion in the buckypaper, where CNTs construct a superflexible skeleton besides an excellent conductive network. The self-supporting superflexible CNT/MNP BP composites have a good application prospect in the field of wearable electronic devices in the future.

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通过定向压力过滤一步成型的 CNT/Fe3O4-羰基铁超柔性降压纸的微波吸收特性

为了实现微波吸收材料结构与功能的一体化，通过定向压力过滤技术将 CNT 与 MNP 复合，制备了碳纳米管/磁性纳米粒子降压纸（CNT/MNP BP）自支撑、超柔、超薄、超轻复合材料。这种 BP 复合材料的体积密度为 0.62 g/cm3，厚度为 0.21 mm，可以不间断地紧紧缠绕在直径为 4 mm 的玻璃棒上很多次而不会造成结构损坏。系统分析了不同成分和含量的 CNT/MNP 复合材料的微波吸收性能和磁性能。Fe3O4 含量为 33.3 wt% 的 CNT-Fe3O4 Buckypaper（CF33.3 %）具有最佳的电磁波吸收能力，其最小反射损耗值为 -52.01 dB，有效吸收带宽为 4.08 GHz。VSM 测试表明，CF33.3 % 的饱和磁化强度为 38.4 emu/g。优异的电磁波吸收性能归功于 CNTs 的极化和传导损耗，MNPs 的自然共振、交换共振和涡流损耗，以及复合材料多孔网络结构中的多重散射和反射。CNTs 和 MNPs 在降压纸中具有良好的分散性，其中 CNTs 除了构建出色的导电网络外，还构建了超柔性骨架。自支撑超柔性 CNT/MNP BP 复合材料在未来的可穿戴电子设备领域具有良好的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.