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In order to solve the problems such as singleness of the absorption mechanism, difficulty of dispersion and inability of broadband absorption, carbon nanotubes were successfully prepared on the surface of acid oxidized carbon fiber by chemical grafting method. The effect of oxidation treatment on the carbon nanotubes modified carbon fiber and their electromagnetic properties were investigated. The results showed that the graft amount and graft efficiency of CNT were improved by oxidation treatment, resulting in the enhancement of the dielectric constant and the electromagnetic wave loss performance. At the condition of the nitric acid concentration of 65% and the reaction time of 8h, the grafted CNTs on the surface of CF reached 15.3% without agglomeration, which showed a good electromagnetic wave absorption property. [ABSTRACT FROM AUTHOR]

Due to the capability of perfect absorption, metamaterial becomes a hot research topic of wave absorbing materials in recent years. However, conventional metamaterials absorber is passive absorption and has the disadvantage that the wave-absorbing property can't be changed once the molding performed. Therefore, tunable metamaterials absorber gradually becomes one of the main research directions. Base on the research developments of tunable metamaterials absorber both of the domestic and foreign, several tunable methods were introduced in classification. Matrix structure and tunable mechanism was chief expounded. Furthermore, the tendency of change of wave absorbing characteristics curve and relationship between wave absorbing characteristics and effect factor were concluded. Finally, full text was summarized. The development trend of tunable metamaterials prospected. The important faction of tunable metamaterials absorber was explained. [ABSTRACT FROM AUTHOR]