High-efficient production of SiC/SiO2 core-shell nanowires for effective microwave absorption

• Published in: Materials & design Vol. 121; pp. 185 - 193
• Main Authors: Zhong, Bo, Sai, Tianqi, Xia, Long, Yu, Yuanlie, Wen, Guangwu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 05.05.2017
• Subjects: Chemical vapor deposition; High efficient production; Low weight percentage; Microwave absorption; Polarization; SiC/SiO2 core-shell nanowires; Polarization; Low weight percentage; Microwave absorption; SiC/SiO2 core-shell nanowires; Chemical vapor deposition; High efficient production
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2017.02.058

In the current report, we have demonstrated that the high-efficient production of SiC/SiO2 core-shell nanowires can be achieved through the introduction of trace of water vapor during the chemical vapor deposition process. The yield of the SiC/SiO2 core-shell nanowires is dramatically improved due to the introduction of water vapor. The SiC/SiO2 core-shell nanowires exhibit an excellent microwave absorption property in the frequency range of 2.0–18.0GHz with a very low weight percentage of 0.50wt.% in the absorbers. A minimum reflection loss value of −32.72dB (>99.99% attenuation) at 13.84GHz has been observed with the absorber thickness of 3.0mm. Moreover, the SiC/SiO2 core-shell nanowires based absorber can reach an effective absorption bandwidth (<−10dB) of 5.32GHz with the absorber thickness of 3.5mm. Furthermore, a possible absorption mechanism is also proposed in detail for such effective attenuation of microwave which can be attributed to the dielectric loss and magnetic loss of SiC/SiO2 core-shell nanowires. [Display omitted] •SiC/SiO2 core-shell nanowires can be prepared via a facile catalyst-free chemical vapor deposition process.•The yield of the nanowires is effectively improved by introducing trace of water vapor during the preparation process.•The SiC/SiO2 core-shell nanowires show excellent microwave absorption properties.