Analysis of Microwave Characteristics of 2D-Material based Nanocomposites

Abstract

Microwave absorptive materials (MAMs) are gaining significant attention due to their demand in various fields such as aerospace, electronics, medical, and defense. These materials shield microwaves by absorbing or reflecting the radiation. In this study, we determine the electromagnetic parameters of materials which is based on the principle of the interaction between the electromagnetic field and the electromagnetic medium. For their microwave absorption behavior, two composite materials were designed and tested i.e., MoSe2/Alumina and MoSe2/MoS2. To analyze the effective permittivity of nanomaterial samples Maxwell Garnett effective medium theory was used. For extraction of S-Parameters in the X and Ku band range (8-18 GHz), models of these composite materials were generated. The Reflection Loss, total Shielding, and percentage absorption were calculated for these samples. In X-band range, 4mm thick sample of 0.4% MoSe2/Alumina composite showed the maximum reflection loss value of -57.12dB. The MoSe2/Alumina composite exhibited higher values of real part of effective permittivity. This can be the reason for enhanced microwave absorptive property of this composite. On the other hand, for MoSe2/MoS2 composite in X-band only a maximum RL value of -0.5dB was observed. Small thickness of the composite can be responsible for the low reflection loss. However, in Ku band, the MoSe2/MoS2 composite with a 3mm thickness demonstrated the highest value of reflection Loss, of -51.90dB. It was found that both MoSe2 and MoS2 use the reflection phenomenon for microwave shielding. The achieved microwave absorbing properties of the MoSe2/MoS2 nanocomposites suggest promising applications in high-performance microwave absorbers. By incorporating 2D transition metal dichalcogenides (TMDs) composites into our work, we can explore new applications which was not feasible or optimized with polymer-based nanocomposites such as electronics and defense industry. By utilizing TMDs composites, we can potentially enhance performance, increase efficiency, or enable entirely new functionalities in these application areas.