A simple co-doping strategy to synthesis of Ni@B/N carbon nanotubes with broadband and low-frequency electromagnetic wave absorption

•Ni nanoparticles are encapsulated into one-dimensional B/N carbon nanotubes.•Co-doping of B and N atoms enhances the dispersity of magnetic nanoparticles.•The Ni@B/N carbon nanotubes exhibit the RLmin of −56.9 dB and an EAB of 7.12 GHz.•The RCS contribution of Ni/B/N composites in the far-field was simulated by CST.