Abstract:

Defect regulation is a key to developing new types of absorbing materials. How to precisely control the concentration and quantity of defects to optimize the loss mechanism of materials remains a major challenge. The absorption frequency of traditional absorbing materials does not match the resonance frequency, which limits their absorption performance. To address these issues, this paper successfully regulated the dipole and carrier density of CoMn nanosheets through the synergistic effect of phosphorus doping and sulfur vacancy defects, significantly improving the electromagnetic wave absorption performance of the material. Experimental results show that the optimized composite material achieves a minimum reflection loss (RL_min) of −52.19 dB and a maximum effective absorption bandwidth (EAB_max) of 5.52 GHz at matching thicknesses of 2.0 mm and 2.2 mm, respectively. The introduction of phosphorus doping and sulfur vacancy defects not only increases the active sites but also enriches the loss mechanism through the formation of heterointerfaces and lattice distortions. This study not only provides a simple method for the preparation of new electromagnetic wave absorbing materials but also offers a new strategy for defect regulation of transition metal dichalcogenides.

Key words: Electromagnetic wave absorption, Sulfur vacancies, Phosphorus doping