N-doped branched metal–organic framework derivatives to boost multiband microwave absorption with ultrathin thickness

CoNi@NPC/NCNTs composites with a rod-like N-doped carbon matrix and branched N-doped CNTs, prepared via melamine-assisted CVD pyrolysis, demonstrate superior dual-band electromagnetic wave absorption (2–18 and 26.5–40 GHz) with ultrathin thickness.