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Carbon nanotube-carbon black/CaCu3Ti4O12 ternary metacomposites with tunable negative permittivity and thermal conductivity fabricated by spark plasma sintering

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Abstract

Metacomposites with negative permittivity usually possess huge dielectric loss, showing potential for micro-wave attenuation devices where huge heat would generate. Herein, carbon nanotube-carbon black/CaCu3Ti4O12 (CNT-CB/CCTO) ternary metacomposites were fabricated by spark plasma sintering. The CNT-CB dual-phase filler was pre-pared through electrostatic self-assembly process in order to construct an effective 3-dimensional (3D) carbon network in CCTO matrix. The percolation threshold of CNT-CB/CCTO composites was identified at filler content of 12.52 wt% which accompanied with an essential change of conduction mechanism. The negative permittivity was derived from low-frequency plasmonic state of the 3D carbon network, described by Drude model. The problem of heat transport, generally occurring in negative permittivity materials, has been solved and optimized in obtained ternary metacomposites benefitting from the substantially high thermal conductivity (9.49–2.00 W·m−1·K−1) and diffusivity (2.74–1.22 mm2·s−1). This work could spark significant development of practical application of metacomposites on novel electronic devices and electromagnetic apparatus.

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摘要

具有负介电常数的超复合材料通常具有巨大的介电损耗, 在微波衰减等应用中将产生巨大的热量。本文采用放电等离子烧结法制备了碳纳米管-炭黑/钛酸铜钙 (CNT-CB/CCTO) 三元超复合材料。通过静电自组装工艺制备CNT-CB双相填料, 从而在CCTO基体中构建有效的三维 (3D) 碳网络。CNT-CB/CCTO复合材料的逾渗阈值为12.52 wt%, 伴随着电导机制由跳跃电导到类金属电导的本质变化。负介电常数频谱可由Drude模型描述, 来源于三维碳网络的低频等离振荡。受益于高的热导率 (约9.49–2 W m−1 K−1) 和扩散率 (约2.74–1.22 mm2 s−1), 通常出现在负介电常数材料中的热传输问题可以得到解决和优化。这项工作将推动超复合材料在新型电子器件和电磁设备上的实际应用。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 52101176, 11604060, 22005071 and 52101010), the China Postdoctoral Science Foundation (No. 2020M671992), Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515110883), Guizhou Provincial Science and Technology Projects (No. ZK [2022] General 044) and the Cultivation Programs Research Foundation of Guizhou University (No. 2019-64). The author Yunpeng Qu greatly thanks the support of the Fund of Natural Science Special (Special Post) Research Foundation of Guizhou University [Grant No. 2023-032].

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

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

  2. Department of Chemistry, City University of Hong Kong, Hong Kong, 999077, China

    Hai-Kun Wu

  3. College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, China

    Pei-Tao Xie

  4. Foshan (Southern China) Institute for New Materials, Foshan, 528200, China

    Pei-Tao Xie

  5. Faculty of Science and Engineering, Department of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Ni Zeng

  6. Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen, 361005, China

    Yu Xie

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Qu, YP., Wu, HK., Xie, PT. et al. Carbon nanotube-carbon black/CaCu3Ti4O12 ternary metacomposites with tunable negative permittivity and thermal conductivity fabricated by spark plasma sintering. Rare Met. 42, 4201–4211 (2023). https://doi.org/10.1007/s12598-023-02346-5

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