Construction of the SiC nanowires network structure decorated by MoS2 nanoflowers in porous Si3N4 ceramics for electromagnetic wave absorption

被引:28
作者
Bai, Jialin [1 ,2 ]
Huang, Shijie [1 ,2 ]
Yao, Xiumin [1 ]
Liu, Xuejian [1 ]
Huang, Zhengren [1 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai 200050, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Flower-branched" structure; MoS2; SiCnw; Porous ceramic; Microwave absorption; HIGH-PERFORMANCE; BAND; HYBRIDS; FOAM;
D O I
10.1016/j.cej.2023.143809
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
SiC nanowires (SiCnw) are widely combined with ceramic matrix for electromagnetic wave (EMW) absorption due to their good conductive network structure. However, the single loss mechanism limits its further application in the field of EMW absorption. Herein, a novel three-dimensional network of SiCnw decorated by MoS2 nanoflowers with a "flower-branched" structure was synthesized in the pores of porous Si3N4 ceramics (MoS2/SiCnw/ Si3N4) by precursor infiltration and pyrolysis combined with hydrothermal reaction. The morphology, pore structure, and dielectric properties of porous MoS2/SiCnw/Si3N4 ceramics were investigated. The interleaved SiCnw within the pore structure provide a large number of growth sites for the MoS2 nanoflowers, ensuring a uniform distribution of MoS2 nanoflowers without agglomeration. Compared with porous SiCnw/Si3N4 ceramics, porous MoS2/SiCnw/Si3N4 ceramics achieve improved microwave absorption performance with an effective absorption bandwidth of 3.50 GHz at a thickness of 2.38 mm and a minimum reflection loss of -70.48 dB at a thickness of 2.10 mm. The excellent EMW absorption performance is attributed to the interfacial polarization loss caused by the MoS2-SiCnw heterogeneous interface, the conduction loss from the SiCnw conductive network, and the defect-induced dipole polarization loss. This work provides new insight into the development of high performance ceramic-based wave absorbing materials.
引用
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页数:10
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