▎ 摘　　要

The current study focuses on the superparamagnetic properties of reduced graphene oxide achieved through varying the crystallite size of rGO nanosheet and incorporating gold nanoparticles (Au-NP). Superparamagnetic features were observed for rGO and Au-NP functionalized rGO (rGO: Au-NP) with corresponding low remanence and coercivity. The superparamagnetic features can be attributed to the crystallite sizes of rGO and rGO: Au-NP as evidenced from X-ray diffraction crystallite size analysis. Density functional theory calculations showed the formation of additional unoccupied states with a corresponding increase in spin density contributions from the hydroxyl functional group and Au atomic doping. The partial density of states revealed C-2p, O-2p, and Au-5d orbitals as the major contributors to the magnetic properties of rGO composites.