Ag/rGO nanocomposites. Typical TEM images of the Ag/rGO nanocomposites obtained in the (a) absence and (b) presence of l-arginine under microwave irradiation. (c) Particle size distribution of Ag nanoparticles on rGO. (d) HRTEM image, (e) SAED pattern, and (f) EDX spectrum of Ag/rGO nanocomposite. The inset in (b) is a magnified image.