| Polyaniline as a conducting polymer is the most commonly material used in microwave absorption. Graphene, as a two-dimension material, has many excellent properties. The composite of two materials has a good performance in microwave absorption. In this paper, the properties of graphene and polyaniline nanocomposite with metal nanomaterials are studied.The spherical Fe3I4particles are prepared by hydro-thermal reaction. With different reaction time, the particles have different morphology. Graphene/polyaniline composite with Fe3O4particles was synthesized by physical mixing. The different mixing proportion of Fe3O4can effect the electromagnetic parameters of materials. The mass ratio of Fe3O4particles are0%,2%,4%,6%respectively. When the mass ratio is2%, the reflection loss can achieve-35.79dB in the frequency of6.1GHz for a4.5mm-thick layer. Mainly because of the doping of Fe3O4particles can improve the dielectric constants of materials.Graphene-oxide/polyaniline nanocomposite with gold nanoparticles is synthesized through three different methods, gold nanoparticles are adsorbed on the surface of graphene, which prevents their particles from being agglomerated, the permeability of the composite has a great increase by the addition of gold nanoparticles, which can effectively improve the microwave absorption property of nanocomposite. The minimum of Reflection loss is-24.61dB and the bandwidth corresponding to RL at-dB can reach4.08GHz.Finally, graphene combined with large area NiO nanosheet is synthesized by a facile hydrothermal route. Compared with pure RGO, the RGO/NiO have a higher reflection loss. After doping the NiO, the maximum absorption frequency of composite changes from16.13GHz to6.1GHz. Figure28, table8, references56. |
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