Design of core-shell nickel oxide/silicon carbide whiskers towards excellent microwave absorption property  

作　　者：Jingpeng Chen Ge Song Zhuo Liu Lijing Xie Shoushun Zhang Chengmeng Chen 

机构地区：[1]CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Journal of Chemical Engineering》2021年第9期208-216,共9页中国化学工程学报（英文版）

基　　金：supported by the National Science Foundation for Excellent Young Scholars of China(21922815);National Natural Science Foundation of China(21975275);Scientific Research Foundation for Young Scientists of Shanxi Province(201801D221156);Research Project Supported by Department of Resource and Social Security of Shanxi Province。

摘　　要：Toward the increasingly serious problem of electromagnetic wave pollution,the development of absorbing material with the properties of the light,thin,wide,strong,and multiple applications scenarios is still a huge challenge.Herein,the core-shell nickel oxide/silicon carbide whiskers(NiO/SiCw)with variational NiO morphologies(tulle-,flower,and rod-like)were designed and fabricated via a facile prehydrothermal method and post-annealing process.For the NiO shell morphology,it can effectively be controlled by the proportion of Ni(NO_(3))_(2)·6H_(2)O,NH_(4)Cl,and CO(NH_(2))_(2).The structure of NiO/SiCw samples was investigated by XRD,SEM,XPS,TEM,and N2 absorption-desorption.Compared to other morphologies of NiO,the flower-like NiO/SiCw possess a porous structure and large surface area that can benefit from the multiple reflections and attenuation of the microwave.As an absorber,the composite with the flower-like NiO/SiCw filler loading of 50%manifests a superior microwave attenuation capability due to its special porous structure,good impedance matching,and large dielectric loss induced from heterojunction interfacial polarization.The minimum reflection loss of flower-like NiO/SiCw is up to-56.8 dB with a thickness of 1.9 mm,and the maximum effective absorption bandwidth(EAB)reaches 5.17 GHz.The as-prepared flower-like NiO/SiCw with strong absorption,thin thickness,and width EAB can meet the potential requirements for microwave absorption materials under oxidation environments.

关 键 词：Flower-like NiO/SiCw Dielectric loss Interfacial polarization Microwave absorption 

分 类 号：TB34[一般工业技术—材料科学与工程]