▎ 摘　　要

The monodisperse Ag-Ni-Fe-P multielemental nanoparticles were synthesized using a simple colloidal synthesis strategy, with size control achieved at approximately 9 nm. Subsequently, a monodisperse Ag-Ni-Fe-P/reduced graphene oxide composite was synthesized via the hot injection method. The Ag-Ni-Fe-P multielemental nanoparticles maintained their small size and uniform dispersion on the reduced graphene oxide, without any aggregation. When compared to the solo Ag-Ni-Fe-P multielemental nanoparticles, the composite exhibited significantly improved electromagnetic absorption performance, with a reflection loss of up to - 40.03 dB at the thickness of 3 mm and an effective electromagnetic absorption bandwidth of up to 3.1 GHz.