Novel construction of CdS-encapsulated TiO_2 nano test tubes corked with ZnO nanorods

摘要

A novel TiO_2 nanotube array/CdS nanoparticle/ZnO nanorod (TiO_2 NT/CdS/ZnO NR) photocatalyst was constructed by chemical assembling CdS into the TiO_2 NTs, and then laying ZnO NRs on the surface. The SEM results showed that the TiO_2 NTs looked like many "nano test tubes" and the ZnO NRs served as the corks to seal the nozzle. This photocatalyst exhibited a wide absorption range (200-535 nm) in both ultraviolet and visible regions (UV-vis region), and maintained very high photoelectrocatalytic (PEC) activities. The maximum photoelectric conversion efficiencies (η) of TiO_2 NT/CdS/ZnO NRs are 31.8 and 5.98% under UV light (365 nm) and visible light (420-800 nm), respectively.