Building of lightweight Nb2CTx MXene@Co nitrogen-doped carbon nanosheet arrays@carbon fiber aerogels for high-efficiency electromagnetic wave absorption in X and Ku bands inspired by sea cucumber
Jiatong Yan, Ce Cui, Wenhao Bai, Hong Tang, Ronghui Guo
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引用次数: 0
Abstract
The problems of electromagnetic wave (EMW) pollution in X and Ku bands (8–18 GHz) are becoming more and more serious. Therefore, it is urgent to design EMW absorbing materials with high-efficiency such as thin thickness, lightweight, wide bandwidth and strong EMW absorption. Inspired by the biomorph of sea cucumber, Nb2CTx MXene@Co nitrogen-doped carbon nanosheet arrays@carbon fiber aerogels (Nb2CTx@Co-NC@CFA, Nb2CTx = niobium carbide) were constructed by self-assembly, in-situ chemical deposition and subsequent pyrolysis. The carbon fiber aerogel, as the basic skeleton of sea cucumber, forms lightweight three-dimensional interconnected conductive network, enhances the dielectric loss and extends the multiple reflection and absorption paths of EMW. As the tentacles of sea cucumber surface, Nb2CTx MXene and Co nitrogen-doped carbon nanosheet arrays exist rich heterogeneous interfaces, which play an important role in improving EMW polarization loss and optimizing impedance matching. The minimum reflection loss (RLmin) of Nb2CTx@Co-NC@CFA reaches −54.7 dB at 9.84 GHz (2.36 mm) with a low filling ratio of 10 wt.% and the effective absorption bandwidth (EAB) of Nb2CTx@Co-NC@CFA reaches 2.96 GHz (8.48–11.44 GHz) with 2.36 mm and 5.2 GHz (12.8–18 GHz) with 1.6 mm, covering most of X and Ku bands by adjusting thickness. The radar cross section (RCS) value of Nb2CTx@Co-NC@CFA is 26.64 dB·m2, which is lower than that of the perfect electrical conductor (PEC), indicating that Nb2CTx@Co-NC@CFA can effectively decrease the probability of the target being detected by the radar detector. This work provides ideas for design and development of EMW absorbing materials with high-efficiency EMW absorption in X and Ku bands.
受海参启发,构建用于 X 和 Ku 波段高效电磁波吸收的轻质 Nb2CTx MXene@Co 氮掺杂碳纳米片阵列@碳纤维气凝胶
X 和 Ku 波段(8-18 GHz)的电磁波(EMW)污染问题日益严重。因此,设计厚度薄、重量轻、带宽宽、电磁波吸收能力强的高效电磁波吸收材料迫在眉睫。受海参生物形态的启发,研究人员通过自组装、原位化学沉积和热解的方法,构建了 Nb2CTx MXene@Co 氮掺杂碳纳米片阵列@碳纤维气凝胶(Nb2CTx@Co-NCo@CFA,Nb2CTx = 碳化铌)。碳纤维气凝胶作为海参的基本骨架,形成了轻质的三维互连导电网络,增强了介质损耗,并扩展了电磁波的多重反射和吸收路径。作为海参表面的触角,Nb2CTx MXene 和 Co 氮掺杂碳纳米片阵列存在丰富的异质界面,在改善电磁波极化损耗和优化阻抗匹配方面发挥了重要作用。通过调整厚度,Nb2CTx@Co-NC@CFA 的有效吸收带宽(EAB)在 2.36 mm 时达到 2.96 GHz(8.48-11.44 GHz),在 1.6 mm 时达到 5.2 GHz(12.8-18 GHz),覆盖了大部分 X 和 Ku 波段。Nb2CTx@Co-NC@CFA的雷达截面(RCS)值为26.64 dB-m2,低于完美电导体(PEC),表明Nb2CTx@Co-NC@CFA能有效降低雷达探测器探测到目标的概率。这项研究为设计和开发在 X 和 Ku 波段具有高效电磁波吸收能力的电磁波吸收材料提供了思路。
期刊介绍:
Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.