Construction of hydrangea-like core-shell SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres for tunable electromagnetic wave absorbers  

作　　者：Huanhuan Niu Xuewen Jiang Yongde Xia Hailong Wang Rui Zhang Hongxia Li Bingbing Fan Yanchun Zhoua 

机构地区：[1]School of Material Science&Engineering,Zhengzhou University,Zhengzhou 450001,China [2]Department of Engineering,University of Exeter,Exeter EX44SB,UK [3]School of Materials Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China [4]Sinostel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,China

出　　处：《Journal of Advanced Ceramics》2023年第4期711-723,共13页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(U2004177);the Outstanding Youth Fund of Henan Province(212300410081);the Support Plan for Scientific and Technological Innovation Talents in Colleges and Universities of Henan Province(22HASTIT001)。

摘　　要：Ti_(3)C_(2)T_(x)MXene shows great potential in the application as microwave absorbers due to its high attenuation ability.However,excessively high permittivity and self-stacking are the main obstacles that constrain its wide range of applications.To tackle these problems,herein,the microspheres of SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi with the hydrangea-like core-shell structure were designed and prepared by a combinatorial electrostatic assembly and hydrothermal reaction method.These microspheres are constructed by an outside layer of CoNi nanosheets and intermediate Ti_(3)C_(2)T_(x)MXene nanosheets wrapping on the core of modified SiO_(2),engendering both homogenous and heterogeneous interfaces.Such trilayer SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres are“magnetic microsize supercapacitors”that can not only induce dielectric loss and magnetic loss but also provide multilayer interfaces to enhance the interfacial polarization.The optimized impedance matching and core-shell structure could boost the reflection loss(RL)by electromagnetic synergy.The synthesized SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres demonstrate outstanding microwave absorption(MA)performance benefited from these advantages.The obtained RL value was-63.95 dB at an ultra-thin thickness of 1.2 mm,corresponding to an effective absorption bandwidth(EAB)of 4.56 GHz.This work demonstrates that the trilayer core-shell structure designing strategy is highly efficient for tuning the MA performance of MXene-based microspheres.

关 键 词：SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi hydrangea-like core-shell structure spherical capacitor high-performance microwave absorption(MA) interfacial polarization impedance match 

分 类 号：TB332[一般工业技术—材料科学与工程]