Construction of high aspect ratio carbon nanotube networks decorated with MoS2 nanoflowers for superior microwave absorption properties

Abstract

Unique structural design and precise compositional adjustment are universally accepted as effective methods for the enhancement of microwave absorption capacity. However, a profound mechanism is still lacking. Recently, diverse structural construction of MoS₂ sheets has attracted considerable attention. This research utilizes flower-like structural construction and composition regulation strategies to enhance the efficiency of MoS₂-based microwave absorbing materials. It aims to thoroughly reveal the correlations between structures, components, dielectric properties and the impedance matching characteristics. The high aspect ratio of carbon nanotubes is utilized to construct a complex conductive network. The MoS₂ flowers facilitate multiple scattering and reflection, increasing the transmission path of microwaves. Moreover, the heterojunction interfaces between MoS₂ and carbon nanotubes enhanced the microwave attenuation mechanism. The results demonstrate that the samples exhibited a strong microwave response at 1.95 mm, with a maximum attenuation of −41.59 dB. Simultaneously, CST simulations verify the actual microwave absorption performance of the composite under far-field conditions. The vertical incident radar cross-section values, compared to PEC, were reduced by a maximum of 36.81 dBm². These findings clearly indicate that the composite possesses excellent impedance matching and high absorption efficiency. This study provides an in-depth analysis of the microwave loss mechanism in dielectric microwave absorption materials, offering reference for enhancing the performance of similar materials.