Double-layer electromagnetic wave absorber based on barium titanate/carbon nanotube nanocomposites
Double-layer electromagnetic wave absorber based on barium titanate/carbon nanotube nanocomposites
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DOI：
10.1016/j.ceramint.2015.04.065
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发表时间：
2015-09
影响因子：
5.2
通讯作者：
Q. Ni;G. Melvin;T. Natsuki
中科院分区：
文献类型：
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作者：
Q. Ni;G. Melvin;T. Natsuki
研究了双层钛酸钡/碳纳米管(BTO/CNT)纳米复合材料的吸波性能。用X射线衍射仪、X射线光电子能谱、透射电子显微镜和场发射扫描电子显微镜对BTO/CNT纳米材料进行了表征。反射损耗(R.L.)根据测量的复介电常数和磁导率计算了样品的介电常数。厚度为1.10 mm的单层BTO/CNT30%纳米复合材料在13.8 GHz处的最小R.L.达到~−30.3 GHz(大于99.9%的吸收)，反射损耗小于−10‘d B(大于90%的吸收)的带宽为1.5 GHz。由BTO/CNT30wt%(吸收层)和BTO30wt%(匹配层)组成的双层复合材料在13.7Ghz处的最小R.L.为~−63.7Gb(超过99.9999%的吸收)，反射损耗小于−10Gb的带宽为1.7Ghz。响应带宽更宽，>；1.7 GHz也可以通过不同设计的双层吸振器来实现。双层复合材料的R.L.显著提高，响应带宽更宽。这些样品能够调节吸收和带宽，以适应不同频段的不同应用，这表明这些纳米复合材料可能是一种优秀的电磁波吸收材料。
The electromagnetic wave absorption properties of double-layer barium titanate/carbon nanotube (BTO/CNT) nanocomposites were evaluated. The BTO/CNT nanomaterials were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The reflection loss (R.L.) of the samples was calculated based on the measured complex permittivity and permeability. The minimumR.L.of single-layer BTO/CNT 30 wt% nanocomposites sample with a thickness of 1.1 mm reached ~−30.3 dB (over 99.9% absorption) at 13.8 GHz, and the bandwidth of the reflection loss less than −10 dB (over 90% absorption) was 1.5 GHz. The double-layer composites consist of BTO/CNT 30 wt% (absorption layer) with thickness of 1.0 mm and BTO 30 wt% (matching layer) with thickness of 0.3 mm showed a minimumR.L.of ~−63.7 dB (over 99.9999% absorption) at 13.7 GHz, and the bandwidth of the reflection loss less than −10 dB was 1.7 GHz. Wider response bandwidth, >1.7 GHz also can be achieved with different designs of double-layer absorbers. TheR.L.significantly improved and wider response bandwidth can be obtained with double-layer composites. The capability to modulate the absorption and bandwidth of these samples to suit various applications in different frequency bands indicates that these nanocomposites could be an excellent electromagnetic wave absorber.