MOF-derived core-shell Co9S8 @MoS2 nanocubes anchored on RGO to construct heterostructure for high-efficiency microwave attenuation

Elegant material construction to realize high-efficiency microwave absorption with low filler loading is in strong demand yet remains challenging. Here we combine a self-assembly method followed by pyrolysis to fabricate core-shell Co9S8 @MoS2 nanocubes, which were uniformly anchored on reduced graphene oxide nanosheets (A-G/Co9S8 @MoS2) to form hierarchical heterostructures. The heterostructure was deliberately designated via chemical etching of in situ formed Co9S8 derived from ZIF-67 and decoration of flower-like MoS2 nanosheets. Owing to its synergic effect in compositions and well-designed heterostructure, the product A-G/Co9S8 @MoS2 exhibits excellent microwave absorption performance with low loading content. A minimum reflection loss of − 55.13 dB and effective absorption bandwidth of 6.61 GHz with filler loading of only 8 wt% was achieved, contributed by the good impedance matching and dual loss mechanism. This work provides a new pathway for designing low-filler loading high-performance microwave absorption materials.