Microwave absorption enhancement of 2-dimensional CoZn/C@MoS@PPy composites derived from metal-organic framework.

Metal-organic framework (MOF) materials have caused widespread concerns in the field of microwave absorption, due to the unique microstructure and electronic state. Herein, the CoZn/C@MoS@polypyrrole (PPy) composites were prepared through MOF self-template method. The MoS sheets and PPy shell incorporated for optimizing impedance matching of two-dimensional (2D) CoZn/C composites. The introduction of MoS sheets and PPy shell endowed the composites with enhanced microwave absorption. The as-prepared CoZn/C@MoS@PPy composites showed a minimum reflection loss (RL) of -49.18 dB with the thickness of 1.5 mm. In addition, the effective absorption bandwidth (EAB, RL values exceeding -10 dB) covered 4.56 GHz, which showed greater performances than CoZn/C composites under a lower thickness (<2 mm). This work not only provides a facile route for fabricating MOF-derived carbon-based composites as microwave absorbers, but also broadens the application of MOF materials.