Synthesis of TiO2 nanorod-decorated graphene sheets and their highly efficient photocatalytic activities under visible-light irradiation

► TiO2 nanorods were successfully decorated on the surface of graphene sheets. ► Population of TiO2 nanorods can be controlled by changing experimental conditions. ► TiO2 nanorod-decorated graphene sheets have an expanded light absorption range. ► TiO2 nanorod-decorated graphene sheets showed unprecedented photocatalytic activity.