Multiphase interface engineering based on porous manganous oxide toward broad-band microwave absorption

Herein, the porous manganous oxide-based ternary nanocomposites were successfully obtained by combining the in-suit deposition of ZIF-67 and the following thermolysis technology. The synergistic contributions of dipole polarizations, multi-interface induced space charge polarizations, and conductive loss induced by Co particles give the nanocomposites exceptional microwave absorption (MA). Consequently, MnO/Co/C ternary composites presented a strong reflection loss (RL), reaching-51.83 dB at 2.17 mm. Furthermore, the effective absorption bandwidth (EAB) reached 5.6 GHz at 1.9 mm. When adjusting the adding ratio of Co/Mn to 10:1, the EAB achieved 5.68 GHz, nearly covering the whole Ku band. Besides, radar cross-sectional (RCS) simulations verify the MA capabilities and potential use of the materials. This work provides a convenient way to construct manganous oxide-based nanocomposites for high-efficiency MA and radar monitoring.