Materials that can efficiently absorb electromagnetic waves(EMWs)are required to deal with electro-magnetic pollution.Structure design appears to be an efficient way to improve the EMW-absorption per-formance of such materials,particularly when adjustment of the constitution or mixing ratio is limited.In this study,bowl-like and honeycomb titanium dioxide/carbon nanotube(TiO2/CNT)composites with different CNT contents were fabricated using the methods of hierarchical and mixing vacuum-assisted filtration,respectively.Compared to the honeycomb structure,the bowl-like structure simultaneously fa-cilitated greater interfacial polarization and conduction loss in favor of dielectric polarization,and aug-mented multiple reflections.The high porosity of the honeycomb structure was conducive to optimiz-ing the impedance matching characteristics.The bowl-like TiO2/CNT composite exhibited a minimum reflection loss(RLmin)of-38.6 dB(1.5 mm)with a wide effective absorption band(EAB;＜-10 dB)of 4.2 GHz,while the honeycomb TiO2/CNT composite showed an RLmin of-34.8 dB(2.1 mm)with an EAB of 4.3 GHz.The required mixing ratio in the matrix was only 15 wt％,outperforming that of the most closely related composites.Thus,both the bowl-like and honeycomb TiO2/CNT composites are ideal can-didates for light-weight and highly efficient EMW-absorbing materials.

Hua Jian;Qinrui Du;Qiaoqiao Men;Li Guan;Ruosong Li;Bingbing Fan;Xin Zhang;Xiaoqin Guo;Biao Zhao;Rui Zhang

Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Chemical Engineering,Northwest University,Xi'an 710069,China;Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou Research Institute for Abrasives & Grinding Co.,Ltd.,Zhengzhou 450001,China;School of Material Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China

材料科学技术（英文版）

[1]Hua Jian;Qinrui Du;Qiaoqiao Men;Li Guan;Ruosong Li;Bingbing Fan;Xin Zhang;Xiaoqin Guo;Biao Zhao;Rui Zhang-.Structure-dependent electromagnetic wave absorbing properties of bowl-like and honeycomb TiO2/CNT composites)[J].材料科学技术（英文版）,2022(14):105-113

EMWs,cilitated

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