Preparation of nickel/iron/cobalt-coated graphene and infrared interference performance

Graphene, as a new two-dimensional nano carbon material, has a high potential application value in the military field. At present, exploratory research has been carried out on graphene materials in infrared interference, and it has shown good near-infrared interference performance. However, its far-infrared interference performance needs to be improved, and the poor dispersion caused by its easy agglomeration also needs to be solved urgently. In this paper, Reduced Graphene Oxide (RGO) was prepared by oxidation-reduction method, and then RGO/Ni/Fe/Co composite was prepared by chemical plating method. The RGO and RGO/Ni//Fe/Co samples were characterized by SEM, TEM, XPS, EDS, XRD, etc. The complex refractive index of the samples in 2~14μm infrared wavebands was measured by ellipsometry method, and the infrared absorption characteristic was calculated by DDA method. Then, the infrared interference performance was tested by the method of Fourier transform spectrometer connected with smaller smoke box, and the dispersity was also comprehensively evaluated by Carr index method. It is found that electroless nickel-iron-cobalt plating not only can ease the secondary agglomeration between the RGO layers, improve its dispersity, but also can change the electromagnetic properties of graphene surface and significantly improve its infrared absorption. As shown in results, the average mass extinction coefficient of RGO smoke for 3~5 μm infrared was increased from 2.56m² /g to 2.75m² /g, and the average mass extinction coefficient for 8~14 μm infrared was increased from 1.8m² /g to 2.16m² /g. In particular, the far-infrared extinction performance has been obviously improved. It further indicates that the surface modification of electroless nickel-iron-cobalt plating can effectively improve the infrared interference performance of RGO smoke.