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Core‐shell structured iron‐containing ceramic nanoparticles: Facile fabrication and excellent electromagnetic absorption properties
Author(s) -
Gu Chong,
Guo Changqing,
Dong Xichao,
Hu Zhiming,
Wu Pengfei,
Su Zhiming,
Lu Yingxi,
Xu Binbin,
Yu Zhaoju,
Liu Anhua
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16619
Subject(s) - materials science , ceramic , nanoparticle , microstructure , composite material , scanning electron microscope , dielectric , fabrication , reflection loss , transmission electron microscopy , paraffin wax , carbonyl iron , composite number , nanotechnology , optoelectronics , wax , medicine , alternative medicine , pathology
In this work, novel core‐shell structured Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles were fabricated via a polymer‐derived ceramic approach, starting from sol‐like polycarbosilane‐encapsulated polynuclear carbonyl iron nanoparticles and with pitch as an isolator to avoid aggregation during polymer‐to‐ceramic transformation. Elemental analysis, X‐ray photoelectron spectroscopy, X‐ray diffraction, transmission electron microscope, vibrating sample magnetometer and vector network analyzer were employed to investigate the composition, nano/microstructure, morphology, and dielectric/magnetic properties. The results show that the size of obtained Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles is in the range of 2‐200 nm. And the unique core‐shell structure with the hetero‐interface combined with simultaneous dielectric and magnetic loss endow Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles outstanding electromagnetic (EM) wave absorbing performance. With a sample thickness of 4.5 mm, the minimum reflection coefficient (RC) of the composites Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 mixed with paraffin wax reaches −44.7 dB, indicating that more than 99.99% EM waves can be attenuated by the composites. By adjusting the sample thicknesses, the effective bandwidth (the bandwidth of RC values lower than −10 dB) amounts 9.5 GHz (from 2.5 to 12.0 GHz), covering the whole C and X bands.