片状和棒状γ-AlOOH/MWCNTs复合材料的制备及微波吸收性能研究

Preparation and Absorption Properties of Flake and Rod-shaped γ-AlOOH/MWCNTs Composites

以Al(NO_(3))(3)·9H_(2)O、柠檬酸钠和多壁碳纳米管(MWCNTs,Multi Walled Carbon Nanotubes)为原料,采用水热法制备了片状和棒状γ-AlOOH/MWCNTs复合材料。研究了γ-AlOOH/MWCNTs复合材料形貌结构和水热时间对材料电磁参数及微波吸收性能的影响。结果表明:片状复合材料的介电常数高于棒状复合材料,棒状复合材料具有更好的吸波性能。片状γ-AlOOH/MWCNTs复合材料在10.32GHz处的最小反射损耗(RL,Reflection Loss)为-29.86 dB,有效吸收带宽达到3.76 GHz。棒状γ-AlOOH/MWCNTs复合材料在7.92 GHz处的最小反射损耗RL值达到-61.05 dB,同时低于-10 dB的有效吸收带宽为3.44 GHz。

Flake and rod-shaped γ-AlOOH/MWCNTs composites were prepared by hydrothermal method using Al(NO_(3))_(3)·9H_(2)O, sodium citrate and acidified Multi Walled Carbon Nanotubes(MWCNTs) as raw materials. The effects of morphology structure and hydrothermal time of γ-AlOOH/MWCNTs composites on electromagnetic parameters and microwave absorption properties were studied. The results show that the dielectric constant of the lamellar composite is higher than that of the rod composite, and the rod composite has better absorbing property. The minimum reflection loss of the laminar γ-AlOOH/MWCNTs composites at 10.32 GHz is-29.86 dB, and the effective absorption bandwidth reaches 3.76 GHz. The minimum reflection loss RL of the rod-shaped γ-AlOOH/MWCNTs composites at 7.92 GHz is-61.05 dB, while the effective absorption bandwidth is 3.44 GHz, which is lower than-10 dB.