Terahertz Time Domain Spectroscopy of Graphene and MXene Polymer Composites

The rising demand for faster and more efficient electronic devices forces electronics industry to shift toward terahertz frequencies. Therefore there is a growing need for efficient, lightweight, and easy to produce absorbing materials in the terahertz range for electromagnetic interference (EMI) shielding and related applications. This study presents a study on basic optical properties of two types polymer-based composites loaded with two-dimensional structures-graphene and MXene phases (Ti2C). In said range, total EMI shielding efficiency (SE) and its components, the absorption coefficient (alpha), refractive index, and complex dielectric function are investigated. The ratio of SE absorption component to reflection component (SEABS:SER) of fabricated composites is equal or higher than 30:1 in over 80% of studied range. The fabricated composites exhibit low (<0.1) loss tangent in studied range. The addition of 1 wt% of graphene increases the composite alpha over 10-fold in respect to pure polymer-up to60 cm(-1)for frequency higher than 2 THz.