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Fabrication of novel silicon carbide‐based nanomaterials with unique hydrophobicity and microwave absorption property
Author(s) -
Zhong Bo,
Zhang Jinze,
Wang Hanqun,
Xia Long,
Wang Chunyu,
Zhang Xiaodong,
Huang Xiaoxiao,
Wen Guangwu
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13583
Subject(s) - materials science , reflection loss , nanomaterials , microwave , nanocomposite , nanowire , nanoparticle , nanotechnology , fabrication , chemical vapor deposition , absorption (acoustics) , doping , chemical engineering , composite material , optoelectronics , composite number , medicine , physics , alternative medicine , pathology , quantum mechanics , engineering
Novel SiC‐based nanomaterials, namely the nitrogen and aluminum co‐doped SiC@SiO 2 core‐shell nanowires and nitrogen‐doped SiO 2 /Al 2 O 3 nanoparticles, have been fabricated through a facile thermal treatment process based on the chemical vapor deposition and vapor‐liquid reaction. These nanomaterials show remarkable hydrophobicity with a water contact angle (CA) over 140°, which are aroused by the surface zigzag morphology of the nanostructures and the hydrocarbyl groups generated during the preparation process. Moreover the nanocomposites also exhibit relatively prominent microwave absorption (MA) properties in the frequency range of 2.0‐18.0 GHz. The minimum reflection loss (RL) value as low as −23.68 dB can be observed at 14.16 GHz when the absorber thickness is 2.6 mm with a loading rate of 16.7 wt%. And the nanocomposites‐based absorbent can achieve an effective absorption bandwidth (RL < −10 dB) of 4.48 GHz with the absorbent thickness of 2.5 mm. This enhanced microwave attenuation performance can be attributed to multiple polarizations and perfect impedance matching conditions, as well as multiple internal reflections. These marvelous properties make these N and Al co‐doped SiC@SiO 2 core‐shell nanowires and N‐doped SiO 2 /Al 2 O 3 nanoparticles display extensive application potential as MA materials in harsh environment.