Fig. 3From: Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping StrategyHRPES S 2p core-level spectra of the products of the photocatalytic oxidations of Cys (180 L) carried out in the presence of 5 wt % a rGO, b Cr-rGO, c Mn-rGO, d Fe-rGO, e Co-rGO, and f Ni-rGO (left panel). g S3-to-S1 ratios after 180 L of Cys exposure. h Ratios of the intensities of S3 and S1 for rGO and the five types of TM-rGO, resulting from various exposures of Cys to 365-nm wavelength UV light (right panel)Back to article page