由掺杂镍钴合金的互连碳纳米管构建的纳米封闭磁网络可增强电磁波吸收性能

IF 5.5 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xueqing Xu*, Deshun Li, Qiyun Mu, Xiaorong Yang, Rui Su, Qian Yang, Ziqiang Lei and Zhiwang Yang*, 
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引用次数: 0

摘要

金属有机框架(MOF)衍生的磁性金属/碳纳米复合材料因其可定制的介电-磁特性,已发展成为有望应用于电磁波(EMW)吸收领域的功能材料。然而,如何调节 MOF 衍生纳米材料的微观结构以获得优异的电磁波吸收性能仍是一项重大挑战。本文以一维(1D)NiCo-MOF 纳米带为前驱体,通过一步三聚氰胺辅助热解工艺制备了镍钴合金和掺杂氮的竹状碳纳米管网络(NiCo@CNTs/NC)磁介电复合材料。相互连接的碳纳米管网络结构提供了多种电子迁移和跳跃路径,并有效地促进了导电损耗。一维 MOF 中的可调镍/钴节点被有效地转化为镍钴合金纳米颗粒,并被限制在原位生成的互连碳纳米管网络的尖端。这种良好分散和纳米约束的磁性镍钴纳米颗粒生成了纳米级的磁耦合网络,并提供了高密度的极化位点,增强了磁介质耦合能力并引发了界面极化。因此,优化的 NiCo@CNTs/NC-20/1 复合材料实现了出色的电磁波吸收,当填充分数为 20 wt % 时,厚度仅为 1.4 mm 时的强反射损耗(RLmax)为 -30.31 dB,厚度为 1.6 mm 时的有效吸收带宽宽达 4.5 GHz。考虑到其优异的电磁波吸收特性,我们相信这项工作将为磁性金属/碳纳米复合材料的设计提供新的见解,通过在纳米受限空间中合理构建磁性纳米粒子的低维互连磁介质网络来增强电磁波吸收特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanoconfined Magnetic Network Constructed by a NiCo Alloy Doped Interconnected Carbon Nanotube toward Enhanced Electromagnetic Wave Absorption Performance

Nanoconfined Magnetic Network Constructed by a NiCo Alloy Doped Interconnected Carbon Nanotube toward Enhanced Electromagnetic Wave Absorption Performance

Nanoconfined Magnetic Network Constructed by a NiCo Alloy Doped Interconnected Carbon Nanotube toward Enhanced Electromagnetic Wave Absorption Performance

Metal–organic framework (MOF)-derived magnetic metal/carbon nanocomposites have evolved as prospective functional materials with application in the electromagnetic wave (EMW) absorption field due to their tailorable dielectric–magnetic characteristic. Nonetheless, a significant challenge remains in regulating the microstructure of MOF-derived nanomaterials to acquire excellent EMW absorption. Herein, NiCo alloy and N-doped bamboo-like carbon nanotube network (NiCo@CNTs/NC) magnetic–dielectric composites were fabricated using a one-dimensional (1D) NiCo-MOF nanobelt as precursor through a one-step melamine-assisted pyrolyzing process. The interconnected carbon nanotube network structure offers multiple electronic migration and hop paths and effectively facilitates conductive loss. The adjustable Ni/Co nodes in the 1D MOFs were effectively transformed into NiCo alloy nanoparticles and confined within the tips of the in situ-generated interconnected CNT networks. Such well-dispersed and nanoconfined magnetic NiCo nanoparticles generate a nanoscale magnetic coupling network and provide a high density of polarized sites, reinforcing the magnetic–dielectric coupling ability as well as triggering interfacial polarization. Consequently, the optimized NiCo@CNTs/NC-20/1 composite achieves glorious EMW absorption with a strong reflection loss (RLmax) of −30.31 dB at only 1.4 mm thickness and an effective absorption bandwidth as wide as 4.5 GHz at 1.6 mm thickness when the filling fraction is 20 wt %. Considering the excellent EMW absorption properties, we believe that this work will provide new insights into the design of magnetic metal/carbon nanocomposites that enhance EMW absorption properties through the reasonable construction of low-dimensional interconnected magnetic–dielectric networks with magnetic nanoparticles in nanoconfined spaces.

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来源期刊
CiteScore
8.30
自引率
3.40%
发文量
1601
期刊介绍: ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.
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