Temperature-dependent far-infrared absorption of silver smoke

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Abstract
We report measurements of the temperature dependence of the far-infrared absorption of Ag smoke in a Teflon host. By extending the measuring temperature from 298 K down to 4.4 K, we found that the absorption coefficient at 4.4 K is smaller than that at room temperature by only 10%. This slight difference in the absorption coefficient between 4.4 and 298 K proves that the measuring temperature itself is not responsible for the previously observed anomalous enhancement of the far-infrared absorption for these metal-insulator composites. We further suggest an explanation for the temperature dependence of our Ag-Teflon composites based on the electron-impurity scattering mechanism within the Ag particles.