Carbon nanotube-carbon black/CaCu_(3)Ti_(4)O_(12) ternary metacomposites with tunable negative permittivity and thermal conductivity fabricated by spark plasma sintering  

作　　者：Yun-Peng Qu Hai-Kun Wu Pei-Tao Xie Ni Zeng Yan-Li Chen Xiu Gong Jing-Liang Yang Qiong Peng Yu Xie Xiao-Si Qi 

机构地区：[1]College of Physics,Guizhou University,Guiyang 550025,China [2]Department of Chemistry,City University of Hong Kong,Hong Kong 999077,China [3]College of Materials Science and Engineering,Qingdao University,Qingdao 266071,China [4]Foshan(Southern China)Institute for New Materials,Foshan 528200,China [5]Faculty of Science and Engineering,Department of Materials,The University of Manchester,Manchester M139PL,UK [6]Department of Mechanical and Electrical Engineering,Xiamen University,Xiamen 361005,China

出　　处：《Rare Metals》2023年第12期4201-4211,共11页稀有金属（英文版）

基　　金：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]General044);the Cultivation Programs Research Foundation of Guizhou University (No.2019-64);support of the Fund of Natural Science Special (Special Post)Research Foundation of Guizhou University[Grant No.2023-032]。

摘　　要：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/CaCu_(3-)Ti_(4)O_(12)(CNT-CB/CCTO)ternary metacomposites were fabricated by spark plasma sintering.The CNT-CB dualphase filler was pre-pared through electrostatic selfassembly 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 beneftting from the substantially high thermal conductivity(9.49-2.00 W·m^(-1)·K^(-1))and diffusivity(2.74-1.22mm^(2)·s^(-1)).This work could spark significant development of practical application of metacomposites on novel electronic devices and electromagnetic apparatus.

关 键 词：Metacomposites Ceramic matrix composites Negative permittivity Thermal conductivity 

分 类 号：TB33[一般工业技术—材料科学与工程]