LAUSR

Adding metal particles into the material is an effective method to improve the physical and chemical properties of nonpolar materials. However, the concentration of metal particles inside material cannot be adequately measured through conventional methods, such as scanning electron microscope or optical microscope. In this article, based on terahertz time-domain spectroscopy (THz-TDS) system, we propose a “Terahertz Linear Scatter” method to realize the quantitative analysis of metal particles concentration in nonpolar materials. Taking the composite graphene-nanosilver film as an example, THz wave can penetrate graphene with high transmittance, while it will be effectively scattered by nanosilver particles. Importantly, the small volume of the metal particles makes the attenuation of received signals change in a linear fashion. Based on this principle, the concentration of metal particles in nonpolar materials can be identified rapidly and accurately. The corresponding determination coefficient R2 can be as high as 0.9669. These results are of great significance for the analysis of various materials containing metal particles.