Nanocomposite Absorbers .cnts / Ni-fe Preparation And Microwave Absorption Properties

In this paper, carbon nanotubes is used as an experimental substrate to prepared CNTs/Ni and CNTs/Ni-Fe composite particles with the method of electroless plating. Characterized by FTIR,TEM,EDS,VSM and so on. Investigate the effect of the mixed acidratio,the temperature of gas processing,surfactant type and concentration of different reaction conditions to the process of integrated oxidation of CNTs. We also studied the effect of the reaction temperature,pH value,reaction time,heat treatment to the morphology of the coating in the process of electroless plating, and ensure the optimal reaction conditions. The experimental result shows that the process of electroless plating should not be too fast, the coating has a better morphology of density with the condition of low alkaline bath and the heat treatment can improve the continuity and density of the coating.In addition, we observe the capability of the three materials in absorbing microwave with the equipment of HP8722ES and comparison the strength of the absorption and loss of microwave of the three materials. The experimental result shows that the CNTs/Ni and CNTs/Ni-Fe have a little change for the power loss. Compared with CNTs, the CNTs/Ni has a higher magnetic loss in the high frequency and the CNTs/Ni-Fe has a significantly improved of magnetic loss in almost the full-band. the CNTs/Ni has a lower peak but wider frequency band to CNTs. The reflection loss of CNTs/Ni-Fe is under-10DB in the most part of 2-18GHz, and has a high peak. In most part of the band of 2-18GHz, it has a higher reflection loss to the CNTs. All of the intensity and width have a obvious improve.