Single-source-precursor derived multicomponent CNTs/Fe3Si/Fe/SiOCN ceramic nanocomposites: microstructural evolution and excellent electromagnetic wave absorbing properties

被引：20
作者：
Yu, Zhaoju [1 ,2 ,3 ]
Zhu, Qikun [1 ]
Li, Fen [1 ]
Chen, Ting [1 ]
Du, Hanzi [1 ]
机构：
[1] Xiamen Univ, Coll Mat, Minist Educ, Key Lab High Performance Ceram Fibers, Xiamen 361005, Peoples R China
[2] Xiamen Univ, Coll Mat, Fujian Key Lab Adv Mat, Xiamen 361005, Peoples R China
[3] Xiamen Univ, Coll Mat, Xiamen Key Lab Elect Ceram Mat & Devices, Xiamen 361005, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2022年 / 10卷 / 16期
基金：
中国国家自然科学基金;
关键词：
MICROWAVE-ABSORPTION PROPERTIES; CARBON NANOTUBES; SIBCN; CRYSTALLIZATION; CONSTRUCTION; COMPOSITES; INTERFACE; ULTRATHIN;
D O I：
10.1039/d1tc05916e
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work, novel single-source-precursors for CNTs/Fe3Si/Fe/SiOCN ceramic nanocomposites were synthesized by the reaction of poly(methylvinyl) silazane (HTT 1800) with ferric acetylacetonate [Fe(acac)(3)] and carboxylic functionalized carbon nanotubes (CNTs-COOH), which were characterized by means of Fourier transform infrared spectra. The microstructure, phase evolution, electromagnetic properties and electromagnetic microwave absorbing (EMA) performance of the as-prepared ceramics were investigated in detail. The results reveal that the introduced CNTs and the in situ formed nanocrystallites, including alpha-Fe, Fe3Si, alpha-Si3N4, beta-Si3N4, Si2N2O, and SiC, are dispersed in an amorphous SiOCN matrix after annealing at 900-1500 degrees C. The obtained ceramic powders mixed with paraffin wax possess a very low minimum reflection coefficient of -65.3 dB and a broad effective absorption bandwidth of 6 GHz (12-18 GHz) with a thickness of 1.6 mm, indicating outstanding EMA performance. This is due to (i) the increase in interfacial polarization caused by the formation of multiple hetero-interfaces and (ii) the synergistic effect of magnetic and dielectric losses. Therefore, the multicomponent CNTs/Fe3Si/Fe/SiOCN ceramic nanocomposites have promising potential for thin and high-performance EMA materials applied in a harsh environment.
引用
收藏
页码：6252 / 6262
页数：11
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