The enhanced photoactivity of hydrogenated TiO2@reduced graphene oxide with p-n junctions

The hydrogenation of graphene oxide (GO)-TiO2 composites with a quasi-shell-core structure was performed in the temperature range of 250-550 degrees C. All the synthetic hybrid materials displayed enhanced photocatalytic performances and the highest photoactivity was obtained by the hybrid material prepared at 450 degrees C due to the formation of a p-n junction and appropriate charge mobility. The semiconductor behaviour of the resultant reduced graphene oxide (RGO) in the composites had a crossover from p-type to n-type when the hydrogenated temperature increased from 450 degrees C to 550 degrees C.