A CXXXX American Chemical Society The Impact of Functionalization on the Stability, Work Function, and Photoluminescence of Reduced Graphene Oxide

educed graphene oxide (rGO) is emerging as a solution-processable material for a large number of applica-tions includingultrathinflexible electronics,15 sensors,6 catalysis,79 composites,1013 and energy conversion and storage techno-logies.1417 rGO consists of a one-atom thick layer of graphene decorated with oxygen-containing functional groups such as carbo-nyl, hydroxyl, epoxy, and ether groups. The possibility of varying the concentration of such chemical groups and their relative position on the graphene sheet makes rGO a highly versatile functional material. For example, the optical absorption and photo