Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance  

作　　者：Fushan Li Qiuyu Li Hideo Kimura Xiubo Xie Xiaoyu Zhang Nannan Wu Xueqin Sun Ben Bin Xu Hassan Algadi Rami Adel Pashameah Abdullah K.Alanazi Eman Alzahrani Handong Li Wei Du Zhanhu Guo Chuanxin Hou 

机构地区：[1]School of Environmental and Material Engineering,Yantai University,Yantai 264005,China [2]Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 264005,China [3]School of Material Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [4]Mechanical and Construction Engineering,Faculty of Engineering and Environment,Northumbria University,Newcastle Upon Tyne NE18ST,UK [5]College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China [6]Department of Electrical Engineering,Faculty of Engineering,Najran University,Najran 11001,Saudi Arabia [7]Department of Chemistry,Faculty of Applied Science,Umm Al-Qura University,Makkah 24230,Saudi Arabia [8]Department of Chemistry,College of Science,Taif University,P.O.Box 11099,Taif 21944,Saudi Arabia [9]Integrated Composites Laboratory(ICL),Mechanical and Construction Engineering,Northumbria University,Newcastle Upon Tyne NE18ST,UK [10]Department of Chemical and Bimolecular Engineering,University of Tennessee,Knoxville,TN 37996,United States

出　　处：《Journal of Materials Science & Technology》2023年第17期250-259,共10页材料科学技术（英文版）

基　　金：financially supported by the National Natu-ral Science Foundation of China(No.52207249);the Natural Sci-ence Foundation of Shandong Province(No.ZR2022ME089);the research program of Top Talent Project of Yantai University(No.1115/2220001);the Yantai Basic Research Project(No.2022JCYJ04);the Science Fund of Shandong Laboratory of Advanced Ma-terials and Green Manufacturing(No.AMGM2021F11).The au-thors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code:22UQU4320141DSR72.

摘　　要：The microscopic morphology of electromagnetic wave absorbers influences the multiple reflections of electromagnetic waves and impedance matching,determining the absorption properties.Herein,the urchin-shaped bimetallic nickel-cobalt oxide/carbon(NiCo_(2)O_(4)/C)composites are prepared via a hy-drothermal route,whose absorption properties are investigated by different morphologies regulated by changing calcination temperature.A minimum reflection loss(RL_(min))of-75.26 dB is achieved at a match-ing thickness of 1.5 mm,and the effective absorption bandwidth(EAB)of 8.96 GHz is achieved at 2 mm.Multi-advantages of the synthesized NiCo_(2)O_(4)/C composites contribute to satisfactory absorption proper-ties.First,the interweaving of the needle-like structures increases the opportunities for scattering and multiple reflections of incident electromagnetic waves,and builds up a conductive network to facilitate the enhancement of conductive losses.Second,the carbon component in the NiCo_(2)O_(4)/C composites en-hances the interfacial polarization and reduces the density of the absorber.Besides,generous oxygen va-cancy defects are introduced into the NiCo_(2)O_(4)/C composites,which induces defect polarization and dipole polarization.In summary,the ternary coordination of components,defects and morphology led to out-standing electromagnetic wave absorption,which lightened the path for improving the electromagnetic wave absorption property and enriching the family of NiCo_(2)O_(4) absorbers with excellent performance.

关 键 词：NiCo_(2)O_(4)/C Oxygen vacancies Interfacial polarization Electromagnetic wave absorber 

分 类 号：TB332[一般工业技术—材料科学与工程]