Low-frequency microwave absorption of MOF-derived Co/CoO/SrCO₃@C composites

Considering the fast progress of microwave technology and precise electronic devices, great efforts of developing electromagnetic wave absorption materials have been devoted to conquer electromagnetic interference and radiation etc. Herein, a series of MOF-derived Co/CoO/SrCO₃@C composites have been obtained via facile two-stage strategy, and the influence of solvent ratio on the final low-frequency electromagnetic wave absorbing performance of as-prepared hybrids has been investigated as well. The composite prepared with DMF/EG ratio of 120mL/80 mL possesses the best microwave absorption properties i.e. the maximal RL can reach −39.51 dB at 0.41 GHz with EAB of 0.12–1.26 GHz for 2 mm thickness, and its largest EAB can be observed at only 1 mm for a board range of 0.45–3 GHz, which is due to the interlaced structure of NPs and hollow nanotubes, thus it can attenuate incident microwave via strong conduction loss, magnetic wastage and opportune dielectric dissipation ability etc. This MOF-derived absorbent could be applied as practical candidate for efficient low-frequency electromagnetic wave absorbing indeed.