In Situ Grown 1D/2D Structure of Dy3Si2C2 on SiCw for Enhanced Electromagnetic Wave Absorption

Author:

Qin Gang12,Li Yang3,Zhou Wei4ORCID,Xu Huidong2,Hu Fang1,Zhou Xiaobing12

Affiliation:

1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China

2. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

3. National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China

4. Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, China

Abstract

To improve electromagnetic wave (EMW) absorption performance, a novel nano-laminated Dy3Si2C2 coating was successfully in situ coated on the surface of SiC whisker (SiCw/Dy3Si2C2) using a molten salt approach. A labyrinthine three-dimensional (3D) net was constructed by the one-dimensional (1D) SiCw coated with the two-dimensional (2D) Dy3Si2C2 layer with a thickness of ~100 nm, which significantly improved the EMW absorption properties of SiCw. Compared to pure SiCw with the minimum reflection loss (RLmin) value of −10.64 dB and the effective absorption bandwidth (EAB) of 1.04 GHz for the sample with a thickness of 4.5 mm, SiCw/Dy3Si2C2 showed a significantly better EMW absorption performance with RLmin of −32.09 dB and wider EAB of 3.76 GHz for thinner samples with a thickness of 1.76 mm. The enhancement of the EMW absorption performance could be ascribed to the improvement of impedance matching, enhanced conductance loss, interfacial polarization as well as multiple scattering. The SiCw/Dy3Si2C2 can be a candidate for EMW absorber applications due to its excellent EMW absorption performance and wide EAB for relatively thin samples, light weight, as well as potential oxidation and corrosion resistance at high temperatures.

Funder

National Natural Science Foundation of China

the Natural Science Foundation of Ningbo city

Ningbo 3315 Innovative Teams Program, China

Advanced Energy Science and Technology Guangdong Laboratory

Publisher

MDPI AG

Subject

General Materials Science

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