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Universal paradigm of ternary metacomposites with tunable epsilon-negative and epsilon-near-zero response for perfect electromagnetic shielding

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Abstract

CaCu3Ti4O12 (CCTO) ceramic nanocomposites incorporating graphene–carbon black (GRCB) fillers were fabricated by spark plasma sintering process. The percolative effects of conductive GRCB fillers on dielectric response of GRCB/CCTO ternary metacomposites were systematically investigated. The weakly real permittivity (ε′)-negative response (ε′ ~ − 1 × 102) was achieved which originated from weakly low-frequency plasmonic state of free carriers within constructed GRCB networks. With enhancing three-dimensional GRCB network, the plasma frequency of metacomposites increased while the damping factor decreased. Herein, the ε′-negative values of metacomposites were tuned from − 102 to − 104 orders of magnitude and ε′-near-zero (ENZ) frequencies from ~ 142 to ~ 340 MHz which substantially benefited from the moderate carrier concentration of GRCB dual fillers. The Drude model and equivalent circuit models were adopted to demonstrate dielectric and electrical characteristics. The obtained metacomposites show strong EM shielding effect along with enhanced plasmonic oscillation and even better achieving perfect EM shielding effect in ENZ media. This work achieves the tunable ε′-negative and ε′-near-zero response and more importantly clarifies its regulation mechanism in ceramic-based ternary metacomposites, which opens up the possibility of designing high-performance EM shielding materials based on metacomposites.

Graphical abstract

摘要

采用放电等离子烧结工艺制备了石墨烯炭黑（GRCB）二元复合功能相填充的钛酸铜钙（CCTO）基陶瓷纳米复合材料。系统研究了导电GRCB功能相对GRCB/CCTO三元超复合材料介电响应的逾渗效应。在所构建的三维GRCB网络中，自由载流子的弱低频等离振荡行为产生了极弱的负介电响应。随着三维GRCB网络的增强，超复合材料的等离振荡频率增加，阻尼因子降低。超复合材料的负介电常数可以在从-102到-104数量级之间调控，介电近零频率在~142到~340 MHz间调控，这得益于GRCB二元功能相的适中的载流子浓度。本文进一步采用Drude模型和等效电路模型来解释超复合材料的介电和电学特性。所获得的超复合材料在增强等离振荡的同时表现出较强的电磁屏蔽效应，甚至在介电近零介质中实现了完美级的电磁屏蔽效果。这项工作实现了可调的负介电常数和介电近零响应，更重要的是阐明了其在陶瓷基三元超复合材料中的调控机制，为设计基于超复合材料的高性能电磁屏蔽材料开辟了新的可能性。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52205593), the Fund of Natural Science Special (Special Post) Research Foundation of Guizhou University (No. 2023-032) and the Platform of Science and Technology and Talent Team Plan of Guizhou Province (No. GCC[2023]007).

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  1. College of Physics, Guizhou University, Guiyang, 550025, China

    Yun-Peng Qu, Jun-Fei Ding, Yan-Li Chen, Xiu Gong, Jing-Liang Yang, Qiong Peng & Xiao-Si Qi

  2. Hangzhou Institute of Technology, Xidian University, Hangzhou, 311231, China

    Yun-Lei Zhou

  3. Department of Materials, ETH Zurich, 8093, Zurich, Switzerland

    Yang Luo

  4. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China

    Yao Liu

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Qu, YP., Zhou, YL., Luo, Y. et al. Universal paradigm of ternary metacomposites with tunable epsilon-negative and epsilon-near-zero response for perfect electromagnetic shielding. Rare Met. 43, 796–809 (2024). https://doi.org/10.1007/s12598-023-02510-x

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  • DOI: https://doi.org/10.1007/s12598-023-02510-x

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