Impact of morphology and dielectric property on the microwave absorbing performance of MoS2-based materials

Molybdenum disulfide (MoS2), as a significant microwave absorption materials, has been widely reported. However, it is unclear and insufficient about its microwave absorption mechanism. In this work, a series of MoS2-based materials with different morphology, including MoS2 nanosheets (MoS2-NS), hierarchical MoS2 (H-MoS2) microspheres, hollow hierarchical MoS2 (HH-MoS2) microspheres and hydrangea-like MoS2/C (MoS2/C) microspheres, were synthesized via hydrothermal reaction. More importantly, the microwave absorption mechanism and the dielectric properties as well as microwave absorption performance (MAP) were systemically studied. The results indicated that MoS2/C exhibited eminent dielectric properties and MAP, which resulted from the unique structure and component. The minimum reflection loss (RL) value of MoS2/C microspheres/wax with 30 wt% loading is -44.67 dB at the thickness of 1.4 mm, and the corresponding bandwidth with effective attenuation (RL < -10 dB) is up to 3.32 GHz (11.7-15.02 GHz). (C) 2018 Elsevier B.V. All rights reserved.