Abstract
The conventional selective template etching method to fabricate yolk-shell microwave absorbers is in-convenient and inefficient,so the thermally-driven contraction strategy was used to prepare asymmet-ric yolk-shell MnSe@C microsphere microwave absorbers via self-template directed transformation.The self-templated oriented transformation enables compositional customization and enhances the template utilization.The confinement effect of the carbon shell is crucial for realizing the thermally-driven con-traction strategy and contributes to the strong conduction loss to MnSe@C.On the other hand,the en-hanced polarization loss benefits from the abundant heterogeneous interfaces and defects in the asym-metric yolk-shell MnSe@C microspheres.The rich cavities in the yolk-shell structure not only facilitate optimal impedance matching,but also promote the enhancement of multiple reflection loss(RL).As a result,the asymmetric yolk-shell MnSe@C microspheres obtain excellent microwave absorption perfor-mance,the minimum RL(RLmin)and the maximum effective absorption bandwidth(EAB)reaching-54.4 dB and 5.1 GHz,respectively,at a thickness of 1.9 mm.The successful obtainment of the asymmetric yolk-shell MnSe@C microspheres paves the way for the convenient synthesis of the yolk-shell transition-metal selenides(TMSs)microwave absorbers.
基金项目
National Natural Science Foundation of China(52071053)
National Natural Science Foundation of China(U1704253)
National Natural Science Foundation of China(52103334)
Fundamental Research Funds for the Central Universities(DUT20GF111)
Fundamental Research Funds of Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices(AFMD-KFJJ-21102)
NETL
NSTL
万方数据