Regulatable Phase Manipulation-Enhanced Polarization and Conductance Loss Enabling Hierarchical 3D Microsphere-like MoS₂ with Efficient Microwave Absorption

Molybdenum disulfide (MoS 2 ) has become a new type of microwave absorption (MA) material due to the abundant functional groups and defects, high polarization effect, and controllable structural design. However, the development of MoS 2 has been limited by its inherently low conductance losses and imperfect impedance matching. This study employs ammonium ion (NH 4 + ) intercalation as a phase manipulation strategy to enhance dielectric loss and form heterogeneous structures by incorporating highly conductive 1T phase into the 2H-MoS 2 crystal phase. Additionally, the implementation of CTAB as a soft template agent for constructing layered three-dimensional microsphere structures improves impedance matching. The experimental findings demonstrate that the MA performance of MoS 2 can be effectively regulated by controlling the 1T phase content and morphological structure design. It is worth noting that A-MoS 2 -2 possesses excellent multifrequency absorption capability. A-MoS 2 -2 has a minimum reflection loss (RL) of −53 dB at a coating thickness of 1.99 mm and an effective absorption bandwidth (EAB) of 5.6 GHz at a thinner coating thickness of 1.77 mm. This work improves the MA properties of MoS 2 by introducing metallic phases and unique structural design, which opens up new ideas for the development of MA materials.