| The frequency properties of Au nanoparticles in polyurethane have been investigated. The Au nanoparticles prepared by phase transfer method were added to polyurethane resin and hardened with polyisocyanate. The permittivity, permeability, and frequency reflective loss of the resultant nanocomposites were measured and calculated. From the experimental results, the frequency responses of the hydride resin have demonstrated to be affected with the little addition of Au nanoparticles. The electric permittivities and magnetic permeabilities of Au-nanoparticle-imbedded resin arise from the cut-off frequencies of about 9.0⋅108 Hz. However, the magnitudes of those permitivities are not proportional to the amount of Au nanoparticles in the resin. The fluctuation of frequency response might come from the coupling effect from the polarization of nanoparticles under electromagnetic field and shield their own on the high concentration of addition. As a result, the reflective energy loss takes place with the addition of Au nanoparticles. |
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