High-efficient production of SiC/SiO2 core-shell nanowires for effective microwave absorption
High-efficient production of SiC/SiO2 core-shell nanowires for effective microwave absorption
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DOI：
10.1016/j.matdes.2017.02.058
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发表时间：
2017-05
影响因子：
8.4
通讯作者：
B. Zhong;T. Sai;L. Xia;Yuanlie Yu;G. Wen
中科院分区：
文献类型：
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作者：
B. Zhong;T. Sai;L. Xia;Yuanlie Yu;G. Wen
在目前的报告中，我们已经证明，高效率的生产SiC/SiO2核壳纳米线可以实现通过在化学气相沉积过程中引入微量的水蒸气。水蒸气的引入显著提高了SiC/SiO2核壳纳米线的产率。SiC/SiO2核壳纳米线在2.0-18.0 GHz频率范围内表现出优异的微波吸收性能，其质量分数仅为0.50 wt.%在吸收器中。当吸收体厚度为3.0 mm时，在13.84 GHz处观察到的最小反射损耗值为− 32.72 dB（> 99.99%衰减）。此外，SiC/SiO2核壳纳米线基吸收体可以达到5.32 GHz的有效吸收带宽（<-10 dB），吸收体厚度为3.5 mm。此外，还详细分析了SiC/SiO2核壳纳米线的介电损耗和磁损耗对微波有效衰减的可能吸收机制。
In the current report, we have demonstrated that the high-efficient production of SiC/SiO2core-shell nanowires can be achieved through the introduction of trace of water vapor during the chemical vapor deposition process. The yield of the SiC/SiO2core-shell nanowires is dramatically improved due to the introduction of water vapor. The SiC/SiO2core-shell nanowires exhibit an excellent microwave absorption property in the frequency range of 2.0–18.0 GHz with a very low weight percentage of 0.50 wt.% in the absorbers. A minimum reflection loss value of − 32.72 dB (> 99.99% attenuation) at 13.84 GHz has been observed with the absorber thickness of 3.0 mm. Moreover, the SiC/SiO2core-shell nanowires based absorber can reach an effective absorption bandwidth (<− 10 dB) of 5.32 GHz with the absorber thickness of 3.5 mm. 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/SiO2core-shell nanowires.