Polarization-enhanced three-dimensional Co3O4/MoO2/C flowers as efficient microwave absorbers

摘要

Three-dimensional (3D) hierarchical structures have been widely employed to enhance the microwave absorption performance due to their large surface area, satisfied impedance matching and polymorphic morphology. However, to achieve multiphase and multifunctional performance only within a primary unit remains a tremendous challenge. Herein, special carbon-based C/MoO2/Co(3)O(4)nanosheets were assembled into a flower-like hierarchical architecture by a facile coordination-polymerization method. Abundant Co(3)O(4)magnetic nanoparticles were anchored onto carbon nanoflake substrates, leading to both enhanced polarization and enhanced magnetic coupling. Meanwhile, a large number of heterogeneous junction interfaces among MoO(2)nanoparticles and carbon substrates enhanced the interface polarization. Therefore, the C/MoO2/Co(3)O(4)microflower achieved a minimum reflection loss of -59.7 dB at 17.7 GHz with a thickness of only 1.2 mm, indicative of its great potential as a lightweight microwave absorption material.