Modulation of MoSe₂ & MnFe₂O₄@MnO₂ nano-architectures for microwave absorption properties via single- and bilayer method

The electromagnetic pollution problem, particularly at microwave frequencies, poses a threat to not only sensitive technological gadgets but also to the health of humans. Therefore, there is a great need for lightweight and highly effective microwave-absorbing materials (MAMs). Here, we fabricated a hierarchical flower-like MoSe₂ structure and a rod-like MnFe₂O₄@MnO₂ architecture via a solvothermal method. Single-layer and bilayer samples were fabricated to study the microwave absorption feature. In single-layer samples, the flower-like MoSe₂ structure has better microwave absorption properties than the rod-like MnFe₂O₄@MnO₂ architecture. And in bilayer absorbing samples, a sample with a flower-like MoSe₂ structure as the top layer shows high absorption performance. Moreover, in bilayer samples, changes were made to the thickness of both layers to find the best parameters. An optimal bilayer sample has been achieved with a flower-like dielectric MoSe₂ structure as a top layer having a 1 mm thickness and magnetic MnFe₂O₄@MnO₂ as a bottom layer also with a 1 mm thickness; indicating that a strong absorption can only be attained by balancing dielectric loss and magnetic loss. Moreover, the optimal sample shows decent absorption with an effective absorption bandwidth (EAB) of 5.4 GHz (14.7–9.3 GHz) with a 1 mm thickness of each layer. The simulated results of the optimal sample have also been compared with experimental results. These results suggest a different approach for developing MAMs in the future.