Molybdenum Disulfide Modified Silicon Carbide Ceramic Nanofiber: Phase Engineering for Tuning Microwave Absorption Properties of Absorbers

Abstract

Molybdenum disulfide (MoS2) is an important two-dimension multifunction material, which is widely used in semiconductor devices due to its special electrical properties. However, the electromagnetic wave absorption performance of MoS2 is severely limited as a result of the impedance mismatch between the material and free space. To address this issue, effective strategies of phase engineering and in situ growth techniques are employed to synthesize 2H MoS2, 1T/2H MoS2, SiC@2H MoS2, and SiC@1T/2H MoS2 composites. The electromagnetic absorbing property data reveal that the minimum reflection loss can reach ‒58.04 dB at 11.16 GHz in a 2.5 mm thick SiC@1T/2H MoS2 nanofiber coating; the effective absorbing bandwidth is up to 5.04 GHz (9.16-14.2 GHz). From the detailed analysis, it can be seen that the dielectric loss strength and the degree of impedance matching are the critical factors impacting the microwave absorption properties. The attenuation mechanisms underlying the excellent microwave absorption performance and related phenomena are explored, opening new directions for synthesizing MoS2-based electromagnetic wave absorbing materials with efficient and broadband.

Keywords: phase engineering, MoS2, SiC@1T/2H MoS2 nanofiber, dielectric loss, microwave absorption