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Building of lightweight Nb_(2)CT_(x) 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

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Nano Research 2024年第11期17卷 9261-9274页

作者： Jiatong Yan Ce Cui Wenhao Bai Hong Tang Ronghui Guo College of Biomass Science and Engineering Sichuan University Chengdu 610065 China Yibin Industrial Technology Research Institute Sichuan University Yibin 644005 China High-Tech Organic fibers Key Laboratory of Sichuan Province Chengdu 610041 China Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control China Special Vehicle Research Institute Jingmen 448035 China Graduate School of Energy Science Kyoto University Kyoto City 606-8501 Japan

The problems of electromagnetic wave(EMW)pollution in X and Ku bands(8–18 GHz)are becoming more and more ***,it is urgent to design EMW absorbing materials with high-efficiency such as thin thickness,lightweight,wide bandwidth and strong EMW *** by the biomorph of sea cucumber,Nb_(2)CT_(x) MXene@Co nitrogen-doped carbon nanosheet arrays@carbon fiber aerogels(Nb_(2)CT_(x)@Co-NC@CFA,Nb_(2)CT_(x)=niobium carbide)were constructed by self-assembly,in-situ chemical deposition and subsequent *** 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 *** the tentacles of sea cucumber surface,Nb_(2)CT_(x) 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 *** minimum reflection loss(RLmin)of Nb_(2)CT_(x)@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 Nb_(2)CT_(x)@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 *** radar cross section(RCS)value of Nb_(2)CT_(x)@Co-NC@CFA is 26.64 dB·m^(2),which is lower than that of the perfect electrical conductor(PEC),indicating that Nb_(2)CT_(x)@Co-NC@CFA can effectively decrease the probability of the target being detected by the radar *** work provides ideas for design and development of EMW absorbing materials with high-efficiency EMW absorption in X and Ku bands.

关键词： bionic sea cucumber Nb_(2)CT_(x)MXene Co nitrogen-doped carbon nanosheet arrays carbon fiber aerogel lightweight electromagnetic wave absorption

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