研究了阵列式碳纳米管的雷达波吸收性能.采用化学气相沉积(CVD)工艺制备阵列式碳纳米管薄膜,并采用SEM 和TEM 对其进行观测.观测显示:阵列式碳纳米管薄膜中碳纳米管排列规则,有很好的定向性,直径30～50 nm.阵列式碳纳米管薄膜平铺在铝板上并用环氧树脂固定制成试样,采用反射率扫频测量系统HP8757E矢量网络分析仪检测阵列式碳纳米管吸波性能.结果表明:阵列式碳纳米管在2～18 GHz频段的较高频段表现出良好的吸波性能.吸波性能随薄膜厚度不同而改变.阵列式碳纳米管薄膜厚度为0.2 mm 时,雷达波吸收性能最佳,峰值R为-15.87 dB,波峰出现在17.83 GHz,带宽分别为4.25 GHz(R<-10 dB)和6.40 GHz(R<-5 dB).
The radar wave absorbing properties of aligned carbon nanotubes (ACNTs) were investigated. Aligned carbon nanotubes were grown by chemical vapor deposition (CVD) process. Then the films of ACNTs were put on the surface of an aluminium plate and were fixed by epoxy resin to prepare the samples. Aligned carbon nanotubes were characterized through TEM and SEM. The photos of SEM and TEM show the carbon nanotues in the films were well arranged with same orientation and have a diameter of 30-50 nm . The radar wave absorbing properties were obtained through radar absorbing materials (RAM) measuring system of arch method reflectivity. The results indicated aligned carbon nanotubes have excellent radar waves absorbing properties in the higher band of 2-18 GHz. The radar waves absorbing properties changed with the film thickness. The best parameters of RAM are obtained at 0.2 mm film thickness of ACNTs. The highest absorbing peak reaches -15.87 dB at 17.83 GHz and has a bandwidth of 4.25 GHz(R<-10 dB)and 6.40 GHz (R<-5 dB)respectively.
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