Highly Efficient Microwave Absorption of Ga2O3/C@PPy Composites: The Role of Pyrrole Polymerization on MIL-96(Ga) derived Ga2O3/C

In this work, MIL-96 (Ga) was successfully synthesized by a microwave-assisted method and pyrolyzed at 700 o C to obtain Ga 2 O 3 /C (G-700) composites. After carbonization, Ga 2 O 3 nanoparticles were uniformly embedded in a porous carbon skeleton. The surface of MIL-96(Ga)-derived Ga 2 O 3 /C was used as a template for directional pyrrole polymerization. G-700@PPy composite materials were obtained by in-situ polymerization of pyrrole on the surface of G-700. A hierarchical interfacial structure was created with regulated dielectric properties. The effect of pyrrole doping content on the electromagnetic waves (EMWs) absorption properties of G-700@PPy composite materials was studied. The experimental result showed that the minimum reflection loss ( RL min ) value of G-700@PPy-3 composite materials reached -79.0 dB under a thin thickness of 1.58 mm, and the maximum effective absorption bandwidth (EAB) of 5.66 GHz was obtained under 1.78 mm. The results indicate that highly conductive PPy could significantly improve the impedance matching conditions and electromagnetic attenuation capacity of G-700 composite materials, which provided an important idea for optimizing the microwave absorption properties of low permittivity composites.