材料科学
反射损耗
电介质
介电损耗
吸收(声学)
介电常数
微波食品加热
X射线晶体学
光电子学
纳米技术
复合材料
光学
衍射
物理
复合数
量子力学
作者
Huanhuan Niu,Xuewen Jiang,Yongde Xia,Hailong Wang,Rui Zhang,Hongxia Li,Bingbing Fan,Yanchun Zhou
标识
DOI:10.26599/jac.2023.9220714
摘要
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 homogenous 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.
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