Facile synthesis and enhanced microwave absorption properties of novel hierarchical heterostructures based on a Ni microsphere–CuO nano-rice core–shell composite

The microwave absorption properties of a core–shell rice-like CuO-coated Ni composite are superior to those of pure Ni microspheres and CuO nanoflakes. The optimal reflection loss is −62.2 dB at 13.8 GHz.