Regulatable Phase Manipulation-Enhanced Polarization and Conductance Loss Enabling Hierarchical 3D Microsphere-like...

Molybdenum disulfide (MoS₂) 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 MoS₂ has been limited by its inherently low conductance losses and imperfect impedance matching. This study employs ammonium ion (NH₄⁺) intercalation as a phase manipulation strategy to enhance dielectric loss and form heterogeneous structures by incorporating highly conductive 1T phase into the 2H-MoS₂ 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 MoS₂ can be effectively regulated by controlling the 1T phase content and morphological structure design. It is worth noting that A-MoS₂-2 possesses excellent multifrequency absorption capability. A-MoS₂-2 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 MoS₂ by introducing metallic phases and unique structural design, which opens up new ideas for the development of MA materials.