Show Author's information Hide Author's Information Huanhuan Niua,Xuewen Jianga,Yongde Xiab,Hailong Wanga,Rui Zhanga,c,Hongxia Lid,Bingbing Fana( 
),Yanchun Zhoua( )
School of Material Science & Engineering, Zhengzhou University, Zhengzhou 450001, China
Department of Engineering, University of Exeter, Exeter EX4 4SB, UK
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
Abstract
Ti3C2Tx 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 SiO2@Ti3C2Tx@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 Ti3C2Tx MXene nanosheets wrapping on the core of modified SiO2, engendering both hom*ogenous and heterogeneous interfaces. Such trilayer SiO2@Ti3C2Tx@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 SiO2@Ti3C2Tx@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.
Keywords: interfacial polarization, spherical capacitor, impedance match, SiO2@Ti3C2Tx@CoNi, hydrangea-like core–shell structure, high-performance microwave absorption (MA)
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